java生成带边框的小图的方法

import java.io.File; import java.io.FileOutputStream; import java.awt.Color; import java.awt.Graphics; import java.awt.Image; import java.awt.image.BufferedImage; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class JpgTest { public void JpgTset() throws Exception { File _file = new File("d:/temp/11.jpg"); // 读入文件 Image src = javax.imageio.ImageIO.read(_file); // 构造Image对象 int width = src.getWidth(null); // 得到源图宽 int height = src.getHeight(null); // 得到源图长 //需要长度 int newwidth = 22;//width / 2 int newheight = 22;//height / 2 BufferedImage image = new BufferedImage(newwidth, newheight, BufferedImage.TYPE_INT_RGB); Graphics graphics = image.getGraphics(); graphics.drawImage(src, 0, 0, newwidth, newheight, null); // 绘制缩小后的图 // 画边框,在drawImage后面，下面代码给图片加上两个像素的白边 graphics.setColor(Color.WHITE); graphics.drawRect(0, 0, newwidth - 1, newheight - 1); graphics.drawRect(1, 1, newwidth - 1, newheight - 1); graphics.drawRect(0, 0, newwidth - 2, newheight - 2); FileOutputStream out = new FileOutputStream("d:/temp/44.jpg"); // 输出到文件流 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(image); // JPEG编码 out.close(); } public static void main(String[] args) { JpgTest jpg = new JpgTest(); try { jpg.JpgTset(); } catch (Exception e) { e.printStackTrace(); } } }