方法一：使用（produces = "application/json; charset=utf-8"）：

 @RequestMapping(value="/getUsersByPage",produces = "application/json; charset=utf-8")

//    @RequestMapping("/getUsersByPage")

    @ResponseBody

    public String getUsersByPage(String page,String rows,String text,HttpServletRequest request,HttpServletResponse response){

方法二，在spring-mvc.xml中添加：

<!-- 处理请求返回json字符串的中文乱码问题 -->

    <mvc:annotation-driven>

        <mvc:message-converters>

            <bean class="org.springframework.http.converter.StringHttpMessageConverter">

                <property name="supportedMediaTypes">

                    <list>

                        <value>application/json;charset=UTF-8</value>

                    </list>

                </property>

            </bean>

        </mvc:message-converters>

    </mvc:annotation-driven>