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HomeJavajavaTutorialDetailed introduction to the example code of java intercepting pictures based on coordinates

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java 根据坐标截取图片

实例代码:代码中有不是注释,很好看懂!

package com.json.test; 
 
  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 { 
 
 
  // ===源图片路径名称如:c:\1.jpg   
    private String srcpath ;  
        
    // ===剪切图片存放路径名称.如:c:\2.jpg   
    private String subpath ;  
      
    // ===剪切点x坐标   
    private  int x ;  
      
    private  int y ;    
       
    // ===剪切点宽度   
    private  int width ;  
      
    private  int height ;  
      
    public OperateImage() {  
          
    }    
    public OperateImage( int x, int y, int width, int height) {  
       this .x = x ;  
       this .y = y ;  
       this .width = width ;    
       this .height = height ;  
    }   
      
  /**  
    * 对图片裁剪,并把裁剪完蛋新图片保存 。 
  */   
    public void cut()throws IOException {   
        
      FileInputStream is =  null ;  
      ImageInputStream iis = null ;  
      
      try {    
        // 读取图片文件   
        is =new FileInputStream(srcpath);   
          
        /*  
        * 返回包含所有当前已注册 ImageReader 的 Iterator,这些 ImageReader  
        * 声称能够解码指定格式。 参数:formatName - 包含非正式格式名称 . 
        *(例如 "jpeg" 或 "tiff")等 。  
      */   
        Iterator < ImageReader > it=ImageIO.getImageReadersByFormatName("jpg");   
        ImageReader reader = it.next();   
        // 获取图片流   
        iis = ImageIO.createImageInputStream(is);  
           
        /*  
        * <p>iis:读取源.true:只向前搜索 </p>.将它标记为 ‘只向前搜索&#39;。 
        * 此设置意味着包含在输入源中的图像将只按顺序读取,可能允许 reader 
        * 避免缓存包含与以前已经读取的图像关联的数据的那些输入部分。 
      */   
        reader.setInput(iis, true ) ;  
          
        /*  
        * <p>描述如何对流进行解码的类<p>.用于指定如何在输入时从 Java Image I/O  
        * 框架的上下文中的流转换一幅图像或一组图像。用于特定图像格式的插件 
        * 将从其 ImageReader 实现的 getDefaultReadParam 方法中返回  
        * ImageReadParam 的实例。  
      */   
        ImageReadParam param = reader.getDefaultReadParam();   
          
        /*  
        * 图片裁剪区域。Rectangle 指定了坐标空间中的一个区域,通过 Rectangle 对象 
        * 的左上顶点的坐标(x,y)、宽度和高度可以定义这个区域。  
      */   
        Rectangle rect =  new Rectangle(x, y, width, height);   
          
           
        // 提供一个 BufferedImage,将其用作解码像素数据的目标。   
        param.setSourceRegion(rect);   
 
        /*  
        * 使用所提供的 ImageReadParam 读取通过索引 imageIndex 指定的对象,并将 
        * 它作为一个完整的 BufferedImage 返回。 
         */   
        BufferedImage bi=reader.read(0,param);          
       
        // 保存新图片   
        ImageIO.write(bi,"jpg",new File(subpath));     
      } finally {  
        if (is != null )  
         is.close() ;      
        if (iis != null )  
         iis.close();   
      }   
        
        
      
    }   
 
    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;  
    }   
 
    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 static void main(String[] args) { 
    OperateImage operateImage = new OperateImage(20, 20, 100, 100); 
    operateImage.srcpath = "C:/test/1.jpg"; 
    operateImage.subpath = "C:/test/2.jpg"; 
    try { 
      operateImage.cut(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
     
  } 
}

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