用servlet动态生成图片

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原创最新推荐文章于 2026-04-07 09:22:47 发布 466 阅读 AI 写同款· GEO 优化 ›

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/**
* 利用Servlet生成动态的图像
* JPEGServlet.java
*/
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class JPEGServlet extends HttpServlet{
/**
* 处理 Http Get request
*/
public void doGet(HttpServletRequest request,HttpServletResponse response)
  throws ServletException,IOException{
  response.setContentType("image/jpeg");
  //注意这里的MIME 类型
  ServletOutputStream out = response.getOutputStream();
  //构造一个缓冲图像
  BufferedImage image = new BufferedImage(750,30,BufferedImage.TYPE_INT_RGB);
  int per = 0;
  per = Integer.parseInt((String)getInitParameter("size"));

  Graphics graphics = image.getGraphics();
  graphics.setColor(Color.green);
  graphics.fillRect(0,0,750,30);//first draw a rectangle
  graphics.setColor(Color.YELLOW);//change color
  graphics.fillRect(0,0,750*per/100,30);
  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
  encoder.encode(image);
  out.close();
}
/**
* 处理 Http Post request,和doGet一样
*/
public void doPost(HttpServletRequest request,HttpServletResponse response)
  throws IOException,ServletException{
  doGet(request,response);
}
}