java截取图片示例

复制代码 代码如下:

package com.b510;

import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Date;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

public class ImageCut {

   
    private String srcpath = "e:/poool.jpg";
   
    private String subpath = "e:/pool_end";
   
    private static final String IMAGE_FORM_OF_JPG = "jpg";
   
    private static final String IMAGE_FORM_OF_PNG = "png";
   
    private int x;

   
    private int y;

   
    private int width;

   
    private int height;

    public ImageCut() {

    }

    public ImageCut(int x, int y, int width, int height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
    }

    public static void main(String[] args) throws Exception {
        ImageCut imageCut = new ImageCut(134, 0, 366, 366);
        imageCut.cut(imageCut.getSrcpath(), imageCut.getSubpath());
    }

   
    public Iterator getImageReadersByFormatName(String postFix) {
        switch (postFix) {
        case IMAGE_FORM_OF_JPG:
            return ImageIO.getImageReadersByFormatName(IMAGE_FORM_OF_JPG);
        case IMAGE_FORM_OF_PNG:
            return ImageIO.getImageReadersByFormatName(IMAGE_FORM_OF_PNG);
        default:
            return ImageIO.getImageReadersByFormatName(IMAGE_FORM_OF_JPG);
        }
    }

   
    public void cut(String srcpath, String subpath) throws IOException {
        FileInputStream is = null;
        ImageInputStream iis = null;
        try {
            // 读取图片文件
            is = new FileInputStream(srcpath);

            // 获取文件的后缀名
            String postFix = getPostfix(srcpath);
            System.out.println("图片格式为：" + postFix);
           
            Iterator it = getImageReadersByFormatName(postFix);

            ImageReader reader = it.next();
            // 获取图片流
            iis = ImageIO.createImageInputStream(is);

           
            reader.setInput(iis, true);

           
            ImageReadParam param = reader.getDefaultReadParam();

           
            Rectangle rect = new Rectangle(x, y, width, height);

            // 提供一个 BufferedImage，将其用作解码像素数据的目标。
            param.setSourceRegion(rect);
           
            BufferedImage bi = reader.read(0, param);

            // 保存新图片
            ImageIO.write(bi, postFix, new File(subpath + "_" + new Date().getTime() + "." + postFix));
        } finally {
            if (is != null)
                is.close();
            if (iis != null)
                iis.close();
        }

    }

   
    public String getPostfix(String inputFilePath) {
        return inputFilePath.substring(inputFilePath.lastIndexOf(".") + 1);
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public String getSrcpath() {
        return srcpath;
    }

    public void setSrcpath(String srcpath) {
        this.srcpath = srcpath;
    }

    public String getSubpath() {
        return subpath;
    }

    public void setSubpath(String subpath) {
        this.subpath = subpath;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

}