java 实现图片截取

LoadImage.java:

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JApplet;

public class LoadImage extends JApplet{

 String addrs="D:\\test1.jpg";//改成自己的图片路径
 BufferedImage mm,child;
 CutImage ci;

 public LoadImage(){

  try {
   mm=ImageIO.read(new File(addrs));
  } catch (IOException e) {
   System.out.println("图片读取失败！");
   e.printStackTrace();
  }
  ci=new CutImage(mm);
  child=ci.getChildImage(50, 0, 150, 220);
 }

 public void init(){

 }
    public void paint(Graphics g){
     g.setColor(Color.red);
     g.drawString("原图：",0,10);
     g.drawImage(mm, 20,10,this);
     g.drawString("ci.getChildImage(50, 0, 150, 220)截取后的图片",mm.getWidth()+30,10);
     g.drawImage(child, mm.getWidth()+50,20,this);
    }
}


CutImage.java

 import java.awt.Image;
 import java.awt.image.BufferedImage;

 public class CutImage {
 private BufferedImage img;
 private BufferedImage child;
 public CutImage(){
 }
 public CutImage(BufferedImage im){
  img=im;
 }
 public CutImage(Image im){
  img=(BufferedImage)im;
 }
 public void setImg(BufferedImage img) {
  this.img = img;
 }

 public BufferedImage getChildImage(int x,int y,int width,int height) {
  int cw=width;
  int ch=height;
  int pw=img.getWidth();
  int ph=img.getHeight();
  if(pw<x+width){
   System.out.println("给出的参数超出原图片的范围！程序会自动减小宽度或高度");
   cw=pw-x;
  }

  if(ph<y+height){
   System.out.println("给出的参数超出原图片的范围！程序会自动减小宽度或高度");
   ch=ph-y;
  }
  child=new BufferedImage(cw,ch,BufferedImage.TYPE_INT_ARGB );
  for(int i=0;i<ch;i++){
   for(int j=0;j<cw;j++){
    child.setRGB(j, i, img.getRGB(x+j, y+i));
   }
  }
  return child;
 }


}