Servlet笔记11--补充

Posted 2020-08-30 拉夫德尔

Servlet线程安全问题：

　

　　代码示例：

 1 package com.bjpowernode.javaweb.servlet;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 5 
 6 import javax.servlet.ServletException;
 7 import javax.servlet.http.HttpServlet;
 8 import javax.servlet.http.HttpServletRequest;
 9 import javax.servlet.http.HttpServletResponse;
10 
11 public class RegisterServlet extends HttpServlet {
12 
13     private static final long serialVersionUID = 1L;
14 
15     //实例变量
16     private String username;
17     
18     @Override
19     protected void doPost(HttpServletRequest request, HttpServletResponse response)
20             throws ServletException, IOException {
21         
22         response.setContentType("text/html;charset=UTF-8");
23         PrintWriter out = response.getWriter();
24         request.setCharacterEncoding("UTF-8");
25         
26         //局部变量
27         //String username = request.getParameter("username");
28         
29         synchronized(this){
30             //实例变量
31             username = request.getParameter("username");
32             out.print("恭喜你" + username + "注册成功");
33         }
34     }
35 
36     
37 }

 

路径编写总结：