图片处理：切图（图片格式是:bmp,或转为jpg然后再切)

Question

源图格式为bmp格式, 只要把一个图分成两个图就可以了  (切出来的小图,是什么格式都可以).

Answer 1

import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;import java.io.File;
import java.io.IOException;
import java.io.FileOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;/**
 * Created by IntelliJ IDEA.
 * User: wjLu
 * Date: 2006-4-27
 * Time: 14:37:52
 * To change this template use File | Settings | File Templates.
 */
public class SplitImage {
    private File sourceFile;
    private Image sourceImage;    private int[][] coordinate;
    private String targetUrl = "";
    private int count = 0;
    private String adjTargetUrl = "";    private int sourceWidth;
    private int sourceHeight;    private BufferedImage prepBI;
    private BufferedImage splitedBI;    public SplitImage() {
        //To change body of implemented methods use File | Settings | File Templates.
    }    public SplitImage(String sourceUrl, String targetUrl, int[][] coordinate) {
        this.targetUrl = targetUrl;
        this.coordinate = coordinate;
        sourceFile = new File(sourceUrl);
        //是否为有效url
        if(sourceFile.canRead())
            try {
                sourceImage = javax.imageio.ImageIO.read(sourceFile);
            } catch (IOException e) {
                e.printStackTrace();
            }        this.sourceWidth = sourceImage.getWidth(null); //得到源图宽
        this.sourceHeight = sourceImage.getHeight(null); //得到源图长        //init
        prepBI = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_INT_RGB);        //预备BufferedImage
        Graphics g1 = prepBI.getGraphics();
        g1.setColor(Color.WHITE);
        g1.fillRect(0, 0, this.sourceWidth, this.sourceHeight);
        g1.drawImage(sourceImage, 0, 0, this.sourceWidth, this.sourceHeight, null);
    }    private void splitSingle(int x, int y, int lengthX, int lengthY) {
        splitedBI = new BufferedImage(lengthX, lengthY, BufferedImage.TYPE_INT_RGB);
        splitedBI = prepBI.getSubimage(x, y, lengthX, lengthY);        FileOutputStream out=null; //输出到文件流        try {
            out = new FileOutputStream(adjTargetUrl);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(splitedBI); //近JPEG编码
            out.close();
            System.out.println("Created " + adjTargetUrl);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }    public void split() {
        for(int i = 0; i < coordinate.length; i++) {
            increase();
            splitSingle(coordinate[i][0], coordinate[i][1], coordinate[i][2], coordinate[i][3]);
        }
    }    private void increase() {
        this.count ++;
        String adjCount = "";
        for(int i = (count + "").length(); i < 4; i++)
            adjCount += "0";
        adjCount += count;
        this.adjTargetUrl = targetUrl.substring(0, targetUrl.lastIndexOf("."))
                + adjCount
                + targetUrl.substring(targetUrl.lastIndexOf("."));
    }    public static void main(String[] args) {
        SplitImage si = new SplitImage("images/4.bmp", "images/test.jpg", new int[][]{{10,10,30,30},{10,40,20,30},{10,10,30,30},{40,10,20,30}});
        si.split();    }
}临时写的 参考下吧