jQuery.Ajax回调函数返回字符串中文乱码问题

$.post请求到 /a3 成功后获取返回的中文字符串 data 结果在浏览器输出 出现乱码

jsp页面代码

function f1(){
            $.post({
                url:"${pageContext.request.contextPath}/a3",
                data:{"name":$("#name").val()},
                success:function(data){
                    console.log(data);
                }
            })
        }

后台SpringMVC代码

@RequestMapping("/a3")
    public String a3(String name,String pwd){
        String msg = "";
        if(name != null){
            if("admin".equals(name)){
                msg = "用户名正确";
            }else{
                msg = "用户名错误";
            }
        }

没解决之前console.log的输出页面

解决方法：在web.xml配置文件中加入spring的filter过滤器

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

如果在web.xml中加入spring编码过滤器还是无效，就在springmvc-servlet.xml配置文件中加入以下代码

<!--支持mvc注解-->
    <mvc:annotation-driven>
        <!--    json乱码解决-->
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8"/>
            </bean>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                        <property name="failOnEmptyBeans" value="false"/>
                    </bean>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

加入之后就成功解决