imageservlet.java

Java开发的权限管理的例子

package org.artemis.manager.common.image;

import java.io.IOException;
import javax.imageio.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class ImageServlet extends HttpServlet {
	Image image=new Image();

	public ImageServlet() {
		super();
	}

	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}


	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		    response.setContentType("image/jpeg");
			//设置页面不缓存
			response.setHeader("Pragma", "No-cache");
			response.setHeader("Cache-Control", "no-cache");
			response.setDateHeader("Expires", 0);
			//输出图象到页面
			ImageIO.write(image.creatImage(), "JPEG", response.getOutputStream());
			//将认证码存入SESSION
			request.getSession().setAttribute("rand", image.sRand);
	}


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
	    response.setContentType("image/jpeg");
		//设置页面不缓存
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		//输出图象到页面
		ImageIO.write(image.creatImage(), "JPEG", response.getOutputStream());
		//将认证码存入SESSION
		request.getSession().setAttribute("rand", image.sRand);
	}


	public void init() throws ServletException {
		// Put your code here
	}

}