Servlet笔记11--补充

Servlet线程安全问题：

　

　　代码示例：

package com.bjpowernode.javaweb.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

public class RegisterServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    //实例变量
    private String username;
    
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("UTF-8");
        
        //局部变量
        //String username = request.getParameter("username");
        
        synchronized(this){
            //实例变量
            username = request.getParameter("username");
            out.print("恭喜你" + username + "注册成功");
        }
    }

    
}

路径编写总结：