多功能图片压缩工具 类

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.awt.Color;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.awt.Graphics2D;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.awt.Image;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.awt.image.BufferedImage;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.io.File;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.io.FileInputStream;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.io.FileOutputStream;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.io.IOException;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> java.util.Date;

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> com.sun.image.codec.jpeg.ImageFormatException;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> com.sun.image.codec.jpeg.JPEGCodec;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> com.sun.image.codec.jpeg.JPEGEncodeParam;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> com.sun.image.codec.jpeg.JPEGImageEncoder;

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* < p>< strong>图片压缩工具类< /strong>< /p>
* < p>功能支持：< br>
* 1）将源路径的图片/源图片文件，按照指定的图片尺寸、图片质量（默认图片质量为1）压缩，存放到目标路径下< br>
* 2）将源路径的图片/源图片文件，按照指定的图片比例、图片质量（默认图片质量为1）压缩，存放到目标路径下< br>
* 3）将源路径的图片/源图片文件，按照指定的最大长度进行、图片质量（默认图片质量为1）压缩，存放到目标路径下< br>
*
* < p>该工具类还包含其他方法：< br>
* （一）读取图片文件< br>
* （二）输出图片文件（根据指定的图片质量输出）< br>
* （三）压缩图片（其中压缩图片包含三种重构：1）按照指定的尺寸 2）按照指定的比例 3）按照指定的最大长度进行）< br>
* < /p>
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ImageCompressionUtil</span> {</span>
<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源路径的图片，按照指定的图片尺寸、图片质量压缩，存放到目标路径下
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourcePath 源图片路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_width 压缩后的长度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_height 压缩后的高度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> percentage 图片质量百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(String sourcePath, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_width, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_height, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> percentage) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//得到图片</span>
BufferedImage sourceImage = inputImage(sourcePath);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//压缩图片</span>
BufferedImage targetImage = getCompressionedImage(sourceImage, new_width, new_height);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//输出图片</span>
outputImage(targetPath,targetImage,percentage);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源路径的图片，按照指定的图片尺寸压缩，存放到目标路径下（默认图片质量为1）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourcePath 源图片路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_width 压缩后的长度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_height 压缩后的高度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(String sourcePath, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_width, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_height) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
compression(sourcePath, targetPath, new_width, new_height, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>F);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源路径的图片，按照指定的图片比例、图片质量压缩，存放到目标路径下
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourcePath 源图片路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> ratio 压缩百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> percentage 图片质量百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(String sourcePath, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> ratio, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> percentage) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
BufferedImage sourceImage = inputImage(sourcePath);
BufferedImage targetImage = getCompressionedImage(sourceImage, ratio);
outputImage(targetPath,targetImage,percentage);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源路径的图片，按照指定的图片比例压缩，存放到目标路径下（图片质量默认为1）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourcePath 源图片路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> ratio 压缩百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(String sourcePath, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> ratio) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
compression(sourcePath, targetPath, ratio, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>F);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源图片文件，按照指定的图片尺寸、图片质量压缩，存放到目标路径下
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_width 压缩后的长度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_height 压缩后的高度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> percentage 图片质量百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(BufferedImage sourceImage, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_width, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_height, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> percentage) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
BufferedImage targetImage = getCompressionedImage(sourceImage, new_width, new_height);
outputImage(targetPath,targetImage,percentage);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源图片文件，按照指定的图片尺寸压缩，存放到目标路径下(图片质量默认为1)
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_width 压缩后的长度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_height 压缩后的高度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(BufferedImage sourceImage, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_width, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_height) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
compression(sourceImage, targetPath, new_width, new_height, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>F);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源图片文件，按照指定的图片比例、图片质量压缩，存放到目标路径下
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> ratio 压缩百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> percentage 图片质量百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(BufferedImage sourceImage, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> ratio, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> percentage) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
BufferedImage targetImage = getCompressionedImage(sourceImage, ratio);
outputImage(targetPath,targetImage,percentage);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源图片文件，按照指定的图片比例压缩，存放到目标路径下（图片质量默认为1）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> ratio 压缩百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(BufferedImage sourceImage, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> ratio) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
compression(sourceImage, targetPath, ratio, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>F);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源路径的图片，按照指定的最大长度进行、图片质量压缩，存放到目标路径下
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourcePath 源图片路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> maxLength 压缩后的最大长度（长/高）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> percentage 图片质量百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(String sourcePath, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> maxLength, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> percentage) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
BufferedImage sourceImage = inputImage(sourcePath);
BufferedImage targetImage = getCompressionedImage(sourceImage, maxLength);
outputImage(targetPath,targetImage,percentage);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源路径的图片，按照指定的最大长度进行压缩，存放到目标路径下（图片质量默认为1）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourcePath 源图片路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> maxLength 压缩后的最大长度（长/高）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(String sourcePath, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> maxLength) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
compression(sourcePath, targetPath, maxLength, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>F);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源图片文件，按照指定的最大长度进行、图片质量压缩，存放到目标路径下
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> maxLength 压缩后的最大长度（长/高）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> percentage 图片质量百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(BufferedImage sourceImage, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> maxLength, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> percentage) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
BufferedImage targetImage = getCompressionedImage(sourceImage, maxLength);
outputImage(targetPath,targetImage,percentage);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源图片文件，按照指定的最大长度进行压缩，存放到目标路径下（图片质量默认为1）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> maxLength 压缩后的最大长度（长/高）
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">compression</span>(BufferedImage sourceImage, String targetPath,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> maxLength) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException {
compression(sourceImage, targetPath, maxLength, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>F);
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 读取源图片
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourcePath 源图片路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> BufferedImage <span class="hljs-title" style="box-sizing: border-box;">inputImage</span>(String sourcePath) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> IOException {
BufferedImage sourceImage = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//读取文件</span>
File file = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(sourcePath);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//获取文件流</span>
FileInputStream fis;
fis = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> FileInputStream(file);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//字节</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">byte</span>[] b = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">byte</span>[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>];
fis.read(b);
sourceImage = javax.imageio.ImageIO.read(file);
fis.close();
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> sourceImage;
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将图片文件输出到目标路径，并设置压缩质量
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetPath 目标路径
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> targetImage 指定图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> percentage 图片质量百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> IOException
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @throws</span> ImageFormatException
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">outputImage</span>(String targetPath,BufferedImage targetImage,
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> percentage) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> ImageFormatException, IOException{
File file  = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(targetPath);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//判断输出的文件夹路径是否存在，不存在则创建</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//输出到文件流</span>
FileOutputStream fos = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> FileOutputStream(targetPath);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(targetImage);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//压缩质量</span>
jep.setQuality(percentage, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>);
encoder.encode(targetImage, jep);
fos.close();
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 将源图片进行压缩，得到压缩后的图片
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_width 压缩后的长度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> new_height 压缩后的高度
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> BufferedImage <span class="hljs-title" style="box-sizing: border-box;">getCompressionedImage</span>(BufferedImage sourceImage,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_width, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_height){
System.out.println(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"["</span> + <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Date().toString() + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"]-正在压缩图片..."</span>);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//得到原图片的长和高</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> old_width = sourceImage.getWidth();
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> old_height = sourceImage.getHeight();
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//根据原图大小，创建一个空白画布</span>
BufferedImage blankCanvas = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> BufferedImage(old_width,old_height,
BufferedImage.TYPE_INT_RGB);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//在新的画布上从生成原图的缩略图</span>
Graphics2D g2D = blankCanvas.createGraphics();
g2D.setColor(Color.white);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//填充，参数x/y分别表示起始坐标（左上角坐标），w/h分别表示长和高（单位是像素）</span>
g2D.fillRect(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, old_width, old_height);
g2D.drawImage(sourceImage, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, old_width, old_height, Color.white, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>);
g2D.dispose();
BufferedImage targetImage = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> BufferedImage(new_width, new_height,
BufferedImage.TYPE_INT_RGB);
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//缩放图片,getScaledInstance方法实现缩放</span>
targetImage.getGraphics().drawImage(blankCanvas.getScaledInstance(
new_width, new_height, Image.SCALE_SMOOTH), <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>);
System.out.println(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"["</span> + <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Date().toString() + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"]-压缩完成"</span>);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> targetImage;
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 根据比例对图片进行压缩
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> ratio 百分比
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> BufferedImage <span class="hljs-title" style="box-sizing: border-box;">getCompressionedImage</span>(BufferedImage sourceImage,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span> ratio){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> old_w = sourceImage.getWidth();
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> old_h = sourceImage.getHeight();
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> getCompressionedImage(sourceImage, (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>) Math.round(old_w * ratio), (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>) Math.round(old_h * ratio));
}

<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
* 根据最大长度或宽对图片进行压缩
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> sourceImage 源图片文件
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @param</span> maxLength 长或者宽的最大值
*<span class="hljs-javadoctag" style="color: rgb(102, 0, 102); box-sizing: border-box;"> @version</span> 1.0.0
*/</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> BufferedImage <span class="hljs-title" style="box-sizing: border-box;">getCompressionedImage</span>(BufferedImage sourceImage,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> maxLength){
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> old_width = sourceImage.getWidth();
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> old_height = sourceImage.getHeight();
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_width = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> new_height = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>;
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 根据图片尺寸压缩比得到新图的尺寸  </span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (old_width > old_height) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 图片要缩放的比例  </span>
new_width = maxLength;
new_height = (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>) Math.round(old_height * ((<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span>) maxLength / old_width));
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {
new_width = (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>) Math.round(old_width * ((<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">float</span>) maxLength / old_height));
new_height = maxLength;
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> getCompressionedImage(sourceImage, new_width, new_height);
}
}</code>