使用java实现图片截取
今天使用java实现图片截取，废话不说，看看代码：
package com.image;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;public class ImageUtils { public static void cutJPG(InputStream input, OutputStream out, int x, int y, int width, int height) throws IOException { ImageInputStream imageStream = null; try { Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("jpg"); ImageReader reader = readers.next(); imageStream = ImageIO.createImageInputStream(input); reader.setInput(imageStream, true); ImageReadParam param = reader.getDefaultReadParam(); System.out.println(reader.getWidth(0)); System.out.println(reader.getHeight(0)); Rectangle rect = new Rectangle(x, y, width, height); param.setSourceRegion(rect); BufferedImage bi = reader.read(0, param); ImageIO.write(bi, "jpg", out); } finally { imageStream.close(); } } public static void cutPNG(InputStream input, OutputStream out, int x, int y, int width, int height) throws IOException { ImageInputStream imageStream = null; try { Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("png"); ImageReader reader = readers.next(); imageStream = ImageIO.createImageInputStream(input); reader.setInput(imageStream, true); ImageReadParam param = reader.getDefaultReadParam(); System.out.println(reader.getWidth(0)); System.out.println(reader.getHeight(0)); Rectangle rect = new Rectangle(x, y, width, height); param.setSourceRegion(rect); BufferedImage bi = reader.read(0, param); ImageIO.write(bi, "png", out); } finally { imageStream.close(); } } public static void cutImage(InputStream input, OutputStream out, String type,int x, int y, int width, int height) throws IOException { ImageInputStream imageStream = null; try { String imageType=(null==type||"".equals(type))?"jpg":type; Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName(imageType); ImageReader reader = readers.next(); 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); ImageIO.write(bi, imageType, out); } finally { imageStream.close(); } } public static void main(String[] args) throws Exception { ImageUtils.cutJPG(new FileInputStream("c:\\test.JPG"), new FileOutputStream("c:\\test2.jpg"), 0,0,200,100); ImageUtils.cutPNG(new FileInputStream("c:\\1.png"), new FileOutputStream("c:\\test3.png"), 0,0,50,40); }}?