java裁剪图片

import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

/**
* 对图片做裁剪
*/
public class ImageUtils {
/**
* 对图片做裁剪
* @param input 源图片
* @param input 保存的图片
* @param sourceType 源图片的类型
* @param savedType 保存图片的类型
* @param x x坐标
* @param y y坐标
* @param width 宽度
* @param height 高度
*/
public static void cutImage(InputStream input, OutputStream out,
String sourceType, String savedType,
int x, int y, int width, int height)
throws IOException {
ImageInputStream imageStream = null;
try {
//根据指定的类型创建ImageReader
Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName(sourceType);
ImageReader reader = readers.next();
//把需要裁剪的图片读到内存中
imageStream = ImageIO.createImageInputStream(input);
reader.setInput(imageStream, true);
ImageReadParam param = reader.getDefaultReadParam();
Rectangle rect = new Rectangle(x, y, width, height);
param.setSourceRegion(rect);
BufferedImage bi = reader.read(0, param);
//保存裁剪完的图片
ImageIO.write(bi, savedType, out);
} finally {
imageStream.close();
}
}

public static void main(String[] args) throws Exception {
ImageUtils.cutImage(new FileInputStream("c:\\test.bmp"),
new FileOutputStream("c:\\1111cut.jpg"),
"bmp",
"jpg",
0,
0,
100,
36);
}
}