参考1
参考2
参考-BalusC的回答
JBoss参考1
JBoss参考2

问题描述

当URL中存在中文参数时，后台收到的参数值为乱码。

http://localhost:8080/test?desc=呵呵

项目环境

JSP + Spring MVC 3.2.8 + Tomcat 7

JSP中的编码：

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

web.xml中添加Spring的编码过滤器，这里有提到该过滤器要放在首位。

<filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

解决方法

1. 首先URL中的中文要通过JS的encodeURI函数编码

var desc = encodeURI('呵呵');
var url = 'http://localhost:8080/test?desc=' + desc;

但是即使用encodeURI编码过了，即使web.xml中使用了CharacterEncodingFilter，后台接收到的参数仍然是乱码!因为CharacterEncodingFilter只对POST请求的参数有用，GET请求不会通过他来编码，GET请求需要应用服务器来编码。

2. 应用服务器设置
   Tomcat 7
   在server.xml中设置URIEncoding="UTF-8"

<Connector URIEncoding="UTF-8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>

JBoss
JBoss参考1
JBoss参考2

<system-properties>
     <property name="org.apache.catalina.connector.URI_ENCODING" value="UTF-8"/>
     <property name="org.apache.catalina.connector.USE_BODY_ENCODING_FOR_QUERY_STRING" value="true"/>
</system-properties>

Spring boot

# Charset of HTTP requests and responses. Added to the "Content-Type" header if not set explicitly.
spring.http.encoding.charset=UTF-8
# Enable http encoding support.
spring.http.encoding.enabled=true
# Force the encoding to the configured charset on HTTP requests and responses.
spring.http.encoding.force=true

https://stackoverflow.com/questions/24054648/how-to-configure-characterencodingfilter-in-springboot