java图片压缩工具类

直接上java图片压缩code：

import java.awt.Image; 
import java.awt.image.BufferedImage; 
import java.io.ByteArrayOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
  
import javax.imageio.ImageIO; 
  
public class ImageProcess { 
  
 private Image img;  
  
 private int width;  
  
 private int height;  
  
 private String imageFormat; 
   
 public ImageProcess(InputStream in,String fileName) throws Exception{  
   //构造Image对象  
   img = ImageIO.read(in);  
   //得到源图宽  
   width = img.getWidth(null); 
   //得到源图长  
   height = img.getHeight(null); 
   //文件格式 
   imageFormat = fileName.substring(fileName.lastIndexOf(".")+1); 
 }  
   
 public byte[] resizeFix(int w, int h) throws IOException {  
   if (width / height > w / h) {  
     return resizeByWidth(w);  
   } else {  
     return resizeByHeight(h);  
   }  
 }  
   
 public byte[] resizeByWidth(int w) throws IOException {  
   int h = (int) (height * w / width);  
   return resize(w, h);  
 }  
   
 public byte[] resizeByHeight(int h) throws IOException {  
   int w = (int) (width * h / height);  
   return resize(w, h);  
 }  
   
 public byte[] resize(int w, int h) throws IOException {  
   // SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的 优先级比速度高 生成的图片质量比较好 但速度慢  
   BufferedImage image = new BufferedImage(w, h,BufferedImage.TYPE_INT_RGB );   
   image.getGraphics().drawImage(img, 0, 0, w, h, null); // 绘制缩小后的图  
   ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
   ImageIO.write(image, imageFormat, baos); 
   return baos.toByteArray(); 
 }  
} 

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