HttpServletRequest获取参数并请求转发

HttpServletRequest代表客户端的请求，用户通过Http协议访问服务器，Http请求中的所有信息会被封装到HttpServletRequest，通过这个HttpServletRequest方法，我们可以获得客户端的所有信息。

获取参数、请求转发

LoginServlet.java

package com.godairo.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;

public class LoginServlet extends HttpServlet {

	  @Override
	  protected void doGet(HttpServletRequest request, HttpServletResponse response )throws ServletException, IOException {
			  
	  		 request.setCharacterEncoding("utf-8");
	  		 response.setCharacterEncoding("utf-8");
	  		
	  		  String username = request.getParameter("username");
			  String password = request.getParameter("password");
			  String[] hobbys = request.getParameterValues("hobbys");
			  System.out.println("=====================");
			  //后台接收中文乱码问题
			  System.out.println(username);
			  System.out.println(password);
			  System.out.println(Arrays.toString(hobbys));
			  System.out.println("=====================");

			  //通过请求转发
			  //这里的 / 代表当前的web应用
			  request.getRequestDispatcher("/success.jsp").forward(request,response);
	  }

	  @Override
	  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
			doGet(req, resp);
	  }
}

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


    
登录界面
    

        <%--这里表单表示的意思：以post方式提交表单，提交到我们的login请求--%>
        

            用户名： 

            密   码：  

            爱好：
            女孩
            代码
            唱歌
            电影

            

            
        
    

success.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


      



登陆成功！

web.xml

        
        
                LoginServlet
                com.godairo.servlet.LoginServlet
        
        
        
                LoginServlet
                /login
        
    

 测试运行