1.js : JSON.parse(json)   Json.stringify(obj)

2.jackson:  OjbectMapper  json= new ObjectMapper()

　　 解决乱码：

   @RequestMapping(value="createExcel",produces="plain/text; charset=UTF-8")

                  @ResponseBody

                    String method(){   }

  <mvc:annotation-driven>
        <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>

　　

 2.fastjson