SpringMVC之springmvc原始api,请求中文乱码问题

先搞一波效果图

 1.Controller

package com.tz.controller;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Required;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.tz.domain.Course;

@Controller
public class RequestController {
	/**
	 * @PathVariable("user"):获取路径中的值/handler/{user}
	 * @RequestParam("user"):获取请求参数/hander/{user}?user=coco
	 *
	 * @param userName
	 * @return
	 */
	@RequestMapping("/handle")
	public String handler(@RequestParam(value="user",required=false) String userName){
		//userName = request.getParameter("user");
		System.out.println(userName);
		return "success";
	}

	@RequestMapping("/handle2")
	public String handler02(@RequestParam(value="user",required=false,defaultValue="你没有带参数") String userName,
							@RequestHeader(value="User-Agent",required=false) String user_Agent,
							@CookieValue("JSESSIONID") String js){
		//userName = request.getParameter("user");
		System.out.println(userName);
		System.out.println(user_Agent);
		System.out.println(js);
		return "success";
	}

	/**
	 * springmvc可以在参数上写servlet常用的api
	 * HttpServletRequest
	 * HttpServletResponse
	 * Httpsession
	 *
	 * InputStream:request.getInputStream();
	 * OutputStream:response.getOutputStream();
	 * Reader:request.getReader();
	 * Writer:response.getWriter();
	 *
	 * 请求:客户端-->服务端(客户端显示乱码)
	 * 修改tomcat配置文件
	 * GET有效
	 * <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
	 * 第一次获取请求参数之前:request.setCharacterEncoding("UTF-8");
	 *
	 * 响应:服务端-->客户端(服务端显示乱码)
	 * reponse.setContentType("text/html;charset=utf-8");
	 * @param c
	 * @return
	 */
	@RequestMapping("/addCourse")
	public String addCourse(Course c){//springMVC会自动为我们定义的类型进行赋值
		/**
		 * 1.将对象中的每一个属性从request参数中尝试取出来,并进行封装
		 * request.getParameter("参数名");如果有值,就会取出来封装到实体类的属性中(调用set方法)
		 */
		System.out.println(c);
		return "success";
	}

	@RequestMapping("/handle04")
	public String handle04(HttpSession session,HttpServletRequest request){
		session.setAttribute("session","session域");
		request.setAttribute("request","request域");
		return "success";
	}

}

　　2.配置文件web.xml(最重要的就是设置那个字符编码过滤器)

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <display-name>springmvc_Day01</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

  <servlet>
  	<servlet-name>springmvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<!-- <init-param>
  		<param-name>contextConfigLocation</param-name>
  		指定springmvc配置文件的位置
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param> -->
  	<!-- 如果在web.xml不指定文件位置，也会找默认的文件
  	/WEB-INF/xxx-servlet.xml
  	 -->
  	<!-- 启动加载时期 -->
  	<!-- servlet是当服务器启动的时候加载创建对象，值越小，代表优先级越高，就越先创建对象 -->
<!--   	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param> -->
  	<!-- 如果在web.xml中找不到文件位置，也会默认找文件
  		/WEB-INF/xxx-servlet.xml
  	 -->
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>springmvc</servlet-name>
  	<url-pattern>/</url-pattern>
  		<!--
  	/和/*都是用来拦截所有请求，但是/*的范围更大，还会拦截到*.jsp请求，一旦拦截，则访问jsp页面就不会显示了
  	/也会拦截所有请求，但是不会拦截.jsp,可以保证jsp页面访问正常

  	*.do *.action *.hah
  	/:不拦截jsp *.jsp
  	/*:拦截jsp
  	 -->
  </servlet-mapping>

  <!-- 配置字符编码过滤器 

  	保证该过滤器在所有的过滤器之前，避免请求后拦截不了
  	最好在第一个
  -->
  <filter>
  	<filter-name>CharacterEncodingFilter</filter-name>
  	<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
  	  	<!-- encoding:指定解决请求乱码
  	  		forceRequestEncoding:指定请求与响应的编码集格式为eccoding
  	  		forceResponseEncoding
  	  	 -->
  	  	<init-param>
  			<param-name>encoding</param-name>
  			<param-value>UTF-8</param-value>
  		</init-param>
  		<init-param>
  			<param-name>forceRequestEncoding</param-name>
  			<param-value>true</param-value>
  		</init-param>
  		<init-param>
  			<param-name>forceResponseEncoding</param-name>
  			<param-value>true</param-value>
  		</init-param>

  </filter>
  <filter-mapping>
  	<filter-name>CharacterEncodingFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- reset风格的请求
  	get 查询
  	put 请求修改
  	delect删除
  	post新增
   -->
  <filter>
  	<filter-name>HiddenHttpMethodFilter</filter-name>
  	<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>

  </filter>
  <filter-mapping>
  	<filter-name>HiddenHttpMethodFilter</filter-name>
  	<!-- 这里将.jsp也过滤掉 -->
  	<url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>

原文地址：https://www.cnblogs.com/luyuan-chen/p/11681839.html