jquery采用JS实现高度自适应问题

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Random;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGEncodeParam;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class testStatic {

@SuppressWarnings("restriction")

public static String doCompress(String oldFile) throws FileNotFoundException {

if (oldFile != null) {

Image srcFile=null;

String newImage = null;

try {

File file = new File(oldFile);

// 文件不存在

if (!file.exists()) {

return null;

}

/*读取图片信息*/

srcFile = ImageIO.read(file);

int new_w = srcFile.getHeight(null);

int new_h = srcFile.getHeight(null);

int maxWH = 200;

if(new_w>maxWH||new_h>maxWH){

if (new_w > new_h) {

new_w = maxWH;

new_h = maxWH * new_h / new_w;

} else {

new_w = maxWH * new_w / new_h;

new_h = maxWH;

}

}

/* 宽高设定*/

BufferedImage tag = new BufferedImage(new_w, new_h, BufferedImage.TYPE_INT_RGB);

tag.getGraphics().drawImage(srcFile, 0, 0, new_w, new_h, null);

//随机数

Random rnd = new Random();

int num = rnd.nextInt(89999) + 10000;

/*压缩后的文件名 */

String filePrex = oldFile.substring(0, oldFile.lastIndexOf('.'));

newImage = filePrex + num + oldFile.substring(filePrex.length());

/*压缩之后临时存放位置*/

FileOutputStream out = new FileOutputStream(newImage);

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);

//压缩质量

jep.setQuality(1, true);

encoder.encode(tag, jep);

out.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}finally{

srcFile.flush();

}

return newImage;

} else {

return null;

}

}

//测试

public static void main(String str[]) throws FileNotFoundException {

System.out.println(doCompress("D:/aa.jpg"));

}

}