java处理图片

package com.sinosoft.webmodule.landLibrary;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;

/**
 * java处理 图片将大图转化成小图，固定宽度与高度,一个是放文件路径的，一个是放流的
 * */
public class Temp01{
 
 private Temp01(){
  
 }
 
 private void imageOp(InputStream inFile, String outFilePath, int width, int height){
  Image image = null;
  try {
   image = ImageIO.read(inFile);
  } catch (IOException e) {
   System.out.println("file path error...");
  }
  
  int originalImageWidth = image.getWidth(null);
  int originalImageHeight = image.getHeight(null);
  
  BufferedImage originalImage = new BufferedImage(
    originalImageWidth,
    originalImageHeight,
    BufferedImage.TYPE_3BYTE_BGR);
  Graphics2D g2d = originalImage.createGraphics();
  g2d.drawImage(image, 0, 0, null);
  
  BufferedImage changedImage =
   new BufferedImage(
     width,
     height,
     BufferedImage.TYPE_3BYTE_BGR);
  
  double widthBo = (double)width/originalImageWidth;
  double heightBo = (double)width/originalImageHeight;
  
  AffineTransform transform = new AffineTransform();
  transform.setToScale(widthBo, heightBo);
  
  AffineTransformOp ato = new AffineTransformOp(transform, null);
  ato.filter(originalImage, changedImage);
  
  File fo = new File(outFilePath); //将要转换出的小图文件

  try {
   ImageIO.write(changedImage, "jpeg", fo);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 private void imageOp(String inFilePath, String outFilePath, int width, int height){
  File tempFile = new File(inFilePath);
  Image image = null;
  try {
   image = ImageIO.read(tempFile);
  } catch (IOException e) {
   System.out.println("file path error...");
  }
  
  int originalImageWidth = image.getWidth(null);
  int originalImageHeight = image.getHeight(null);
  
  BufferedImage originalImage = new BufferedImage(
    originalImageWidth,
    originalImageHeight,
    BufferedImage.TYPE_3BYTE_BGR);
  Graphics2D g2d = originalImage.createGraphics();
  g2d.drawImage(image, 0, 0, null);
  
  BufferedImage changedImage =
   new BufferedImage(
     width,
     height,
     BufferedImage.TYPE_3BYTE_BGR);
  
  double widthBo = (double)width/originalImageWidth;
  double heightBo = (double)width/originalImageHeight;
  
  AffineTransform transform = new AffineTransform();
  transform.setToScale(widthBo, heightBo);
  
  AffineTransformOp ato = new AffineTransformOp(transform, null);
  ato.filter(originalImage, changedImage);
  
  File fo = new File(outFilePath); //将要转换出的小图文件

  try {
   ImageIO.write(changedImage, "jpeg", fo);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 public static void main(String[] args) throws FileNotFoundException {
  Temp01 t1 = new Temp01();
  t1.imageOp("f:/6393.jpg", "f:/p03.jpg", 400, 300);

  //InputStream in = new FileInputStream(new File("C:/p02.jpg"));
  //t1.imageOp(in, "C:/p04.jpg", 400, 300);

 }
 
}