如何通过SpringMvc进行url含参传值？

web.xml

<servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
	      <param-name>contextConfigLocation</param-name>
	      <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
      
        <!--  DispatherServlet ,将请求交给一些特定的 进行处理，就需要咨询一个bean
                           就是配置处理器的映射，HandlerMapping 
                          作用：将一个url请求，指定给相应的Controller
            BeanNameUrlHandlerMapping：这个是默认的，将name,作为url:
          -->
            
            
         <!--对控制器进行注解支持  -->   
         <context:component-scan base-package="cn.kgc.controller"></context:component-scan>
          <mvc:annotation-driven/>
          
          
          <!--  完成视图的对应     spring里提供了很多视图解析器
                  InternalResourceViewResolver: jsp的视图解析器-->
          <!-- 对页面路径的一个解析       配置： 前缀     后缀        /WEB-INF/jsp/name.jsp-->
          <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                  <property name="prefix" value="/WEB-INF/jsp/"></property>
                  <property name="suffix" value=".jsp"></property>     
          </bean>
     
</beans>

UserController.java

package cn.kgc.controller;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class UserController {
       private Logger log=Logger.getLogger(UserController.class);
       
	@RequestMapping(value="/in",
			        method=RequestMethod.GET,
			         params="username")
	public String index1(@RequestParam String username){
		System.out.println("今天的天气很好");
		log.info("index"+username);
		return "index";
	}
	
	//将有参变成无参方法，添加：(value="username",required=false)
	@RequestMapping(value="/in")
	public String indexx(@RequestParam(value="username",required=false) String username){
		System.out.println("今天的天气很好xxxxxxx");
		log.info("index"+username);
		return "index";
	}
	
	@RequestMapping(value="/innn")
	public ModelAndView index(@RequestParam String username){
		System.out.println("今天的天气很好xxxxxxx");
		log.info("index"+username);
		ModelAndView mv=new ModelAndView();
		mv.addObject("username",username);
		//设置一个逻辑视图名
		mv.setViewName("index");
		return mv;
	}
}