Java判断图片格式的代码

2015/09/12 46591

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import java.io.File; 
import java.io.IOException; 
import java.util.Iterator; 
import javax.imageio.ImageIO; 
import javax.imageio.ImageReader; 
import javax.imageio.stream.ImageInputStream; 
   
public class ImageDemo { 
   
    /**
     * @param args
     */ 
    public static void main(String[] args) { 
           
        File file = new File("E:/download_test/pics/1c/1cd5v0uya36wg0rf4fu39dtym.png"); 
           
        boolean result = isImage(file); 
        System.out.println("result="+result); 
           
        getExtension(file); 
    } 
       
    public static void getExtension(File file) { 
        ImageInputStream iis = null; 
        try { 
            iis = ImageIO.createImageInputStream(file); 
            Iterator<ImageReader> iter = ImageIO.getImageReaders(iis);  
            if(iter.hasNext()){ 
                System.out.println("扩展名:"+iter.next().getFormatName()); 
            } 
        } catch (IOException e) { 
            e.printStackTrace(); 
        }finally{ 
            if(iis!=null){ 
                try { 
                    iis.close(); 
                } catch (IOException e) { 
                    e.printStackTrace(); 
                } 
            } 
        } 
    } 
   
    public static boolean isImage(File resFile){ 
        ImageInputStream iis = null; 
        try { 
            iis = ImageIO.createImageInputStream(resFile); 
            Iterator<ImageReader> iter = ImageIO.getImageReaders(iis);  
            if (iter.hasNext()) {//文件不是图片  
                return true; 
            }  
               
        } catch (IOException e) { 
            e.printStackTrace(); 
        }finally{ 
            if(iis!=null){ 
                try { 
                    iis.close(); 
                } catch (IOException e) { 
                    e.printStackTrace(); 
                } 
            } 
        } 
        return false; 
    } 
       
}