java 图片处理工具类

import java.awt.Image;
import java.awt.Rectangle;
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.IOException;
import java.io.InputStream;
import java.util.Iterator;

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

public class ImageHelper {
   public static void main(String[] args) throws Exception {
       try {
           ImageHelper.zoomImage("c:/test.jpg","c:\\7.png",400,400);
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }
    /*
     * 根据尺寸图片居中裁剪
     */
     public static void cutCenterImage(String src,String dest,int w,int h) throws IOException{
         Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
         ImageReader reader = (ImageReader)iterator.next();
         InputStream in=new FileInputStream(src);
         ImageInputStream iis = ImageIO.createImageInputStream(in);
         reader.setInput(iis, true);
         ImageReadParam param = reader.getDefaultReadParam();
         int imageIndex = 0;
         Rectangle rect = new Rectangle((reader.getWidth(imageIndex)-w)/2, (reader.getHeight(imageIndex)-h)/2, w, h);
         param.setSourceRegion(rect);
         BufferedImage bi = reader.read(0,param);
         ImageIO.write(bi, "jpg", new File(dest));

     }
    /*
     * 图片裁剪二分之一
     */
     public static void cutHalfImage(String src,String dest) throws IOException{
         Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
         ImageReader reader = (ImageReader)iterator.next();
         InputStream in=new FileInputStream(src);
         ImageInputStream iis = ImageIO.createImageInputStream(in);
         reader.setInput(iis, true);
         ImageReadParam param = reader.getDefaultReadParam();
         int imageIndex = 0;
         int width = reader.getWidth(imageIndex)/2;
         int height = reader.getHeight(imageIndex)/2;
         Rectangle rect = new Rectangle(width/2, height/2, width, height);
         param.setSourceRegion(rect);
         BufferedImage bi = reader.read(0,param);
         ImageIO.write(bi, "jpg", new File(dest));
     }

     /**
      * 图片裁剪通用接口
      * @param src
      * @param dest
      * @param x
      * @param y
      * @param w
      * @param h
      * @throws IOException
      */
    public static void cutImage(String src,String dest,int x,int y,int w,int h) throws IOException{
           Iterator iterator = ImageIO.getImageReadersByFormatName("jpg");
           ImageReader reader = (ImageReader)iterator.next();
           InputStream in=new FileInputStream(src);
           ImageInputStream iis = ImageIO.createImageInputStream(in);
           reader.setInput(iis, true);
           ImageReadParam param = reader.getDefaultReadParam();
           Rectangle rect = new Rectangle(x, y, w,h);
           param.setSourceRegion(rect);
           BufferedImage bi = reader.read(0,param);
           ImageIO.write(bi, "jpg", new File(dest));

    }

    /**
     * 图片缩放
     * @param src image path
     * @param dest target　Ｐ
     * @param w
     * @param h
     * @throws Exception
     */
    public static void zoomImage(String src,String dest,int w,int h) throws Exception {
        double wr=0,hr=0;
        File srcFile = new File(src);
        File destFile = new File(dest);
        BufferedImage bufImg = ImageIO.read(srcFile);
        Image Itemp = bufImg.getScaledInstance(w, h, bufImg.SCALE_SMOOTH);
        wr=w*1.0/bufImg.getWidth();
        hr=h*1.0 / bufImg.getHeight();
        // 如果是低于400的话就不操作
        if(wr>1){
           wr=1;
        }
        if(hr>1){
           hr=1;
        }
        AffineTransformOp ato = new AffineTransformOp(AffineTransform.getScaleInstance(wr, hr), null);
        Itemp = ato.filter(bufImg, null);
        try {
            ImageIO.write((BufferedImage) Itemp,dest.substring(dest.lastIndexOf(".")+1), destFile);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

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java 图片处理工具类

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