0.tomcat已配置：
1.web.xml已配置过滤器
<!-- 配置请求过滤器，编码格式设为UTF-8，避免中文乱码 --> <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> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>2.请求中已添加：
@ResponseBody() @RequestMapping(value = "/users",produces = "application/json;charset=utf-8") public String getLyUsers(HttpServletRequest httpServletRequest,HttpServletResponse httpServletResponse) throws UnsupportedEncodingException { httpServletResponse.setCharacterEncoding("UTF-8"); //httpServletResponse.setHeader("contentType", "json/xml;charset=UTF-8"); httpServletResponse.setContentType("json/xml;charset=UTF-8");以上2种方法都改变不了返回中文乱码的问题（程序是utf-8.浏览器一直是ISO-8859-1）
3.使用以下配置解决（使用时注意选择spring约束。3.1版本才开始有 <mvc:message-converters>这个参数。我选择的3.2）
<mvc:annotation-driven> <mvc:message-converters> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8" /> </bean> </mvc:message-converters> </mvc:annotation-driven>
原因是在使用 @ResponseBody()注解时。会使用StringHttpMessageConverter进行处理。这个类默认的字符集就是
