java實現(xiàn)的圖片裁剪功能示例

package Tsets;
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 PicCut {
  public void cut(int x,int y,int width,int height,String srcpath,String subpath) throws IOException {//裁剪方法
    FileInputStream is = null;
    ImageInputStream iis = null;
    try {
      is = new FileInputStream(srcpath); //讀取原始圖片
      Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName("jpg"); //ImageReader聲稱能夠解碼指定格式
      ImageReader reader = it.next();
      iis = ImageIO.createImageInputStream(is); //獲取圖片流
      reader.setInput(iis, true); //將iis標(biāo)記為true（只向前搜索）意味著包含在輸入源中的圖像將只按順序讀取
      ImageReadParam param = reader.getDefaultReadParam(); //指定如何在輸入時從 Java Image I/O框架的上下文中的流轉(zhuǎn)換一幅圖像或一組圖像
      Rectangle rect = new Rectangle(x, y, width, height); //定義空間中的一個區(qū)域
      param.setSourceRegion(rect); //提供一個 BufferedImage，將其用作解碼像素數(shù)據(jù)的目標(biāo)。
      BufferedImage bi = reader.read(0, param); //讀取索引imageIndex指定的對象
      ImageIO.write(bi, "jpg", new File(subpath)); //保存新圖片
    } finally {
      if (is != null)
        is.close();
      if (iis != null)
        iis.close();
    }
  }
  public static void main(String[] args) throws Exception {
      PicCut pc = new PicCut();
    pc.cut(20, 20, 100, 100,"D:\\1.jpg","D:\\11.jpg");
    System.out.println("ok");
  }
}