package com.up.util;

import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
public class OperateImage {
	
 private String srcpath; //原图路径
 private String subpath; //目标存放路径
 private String imageType; //图片类型
 private int x;
 private int y;
 private int width; //图片目标宽度
 private int height; //图片目标高度 
 
 public OperateImage() {
 }
 
 public OperateImage(String srcpath, int x, int y, int width, int height) {
  this.srcpath = srcpath;
  this.x = x;
  this.y = y;
  this.width = width;
  this.height = height;
 }
 
 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;
  if(srcpath != null) {
   this.imageType = srcpath.substring(srcpath.indexOf(".")+1, srcpath.length());
  }
 }
 
 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;
 }
 
 public String getImageType() {
  return imageType;
 }
 
 public void setImageType(String imageType) {
  this.imageType = imageType;
 }
 
 public boolean cut() throws IOException {
	  FileInputStream is = null;
	  ImageInputStream iis = null;
	  boolean bol = false;
	  try {
		   is = new FileInputStream(srcpath);
		   Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(this.imageType);
		   ImageReader reader = it.next();
		   iis = ImageIO.createImageInputStream(is);
		   reader.setInput(iis, true);
		   ImageReadParam param = reader.getDefaultReadParam();
		   Rectangle rect = new Rectangle(x, y, width, height);
		   param.setSourceRegion(rect);
		   BufferedImage bi = reader.read(0, param);  
           //实际高度大于目标高度或者实际宽度大于目标宽度则进行剪切
           File o = new File(srcpath);
           BufferedImage bii = ImageIO.read(o);
           int itempWidth = bii.getWidth(); //实际宽度
           int itempHeight = bii.getHeight(); //实际高度
           if ((itempHeight > height) || (itempWidth > width)) { 
    		   ImageIO.write(bi, this.imageType, new File(subpath));
    		   bol = true; 
           } 
	  } finally {
	   if (is != null)
	    is.close();
	   if (iis != null)
	    iis.close();
	  }
	  return bol;
 } 
 
 public static void main(String[] args) {
  OperateImage o = new OperateImage("E:\\testdata\\1.jpg", 0, 0, 100, 100);
  o.setSubpath("E:\\testdata\\2.jpg");  
  o.setImageType("jpg"); 
  try {
   o.cut();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
}

java上传图片剪切工具类