SpringMVC集成fastjson遇到的问题

1. SpringMVC 集成fastjson

在SpringMVC中集成fastjson, 集成之后，注解 @ResponseBody 返回的对象就能够自动解析成 json数据返回。
fastjson 的效率要高于 jackson、gson

1. 下载 fastjson.jar

2. 配置 springmvc.xml 文件

    <!--注册映射器，适配器，扫描注解-->
    <mvc:annotation-driven conversion-service="conversionService">
        <mvc:message-converters register-defaults="true">
      
            <!--配置fastJson -->
            <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>


    </mvc:annotation-driven>

3. 添加注解 @ResponseBody

    @RequestMapping(value = "/ajax")
    public @ResponseBody
    Customer ajax(Integer id, HttpServletResponse response) {
        Customer customer = customerService.queryCustomerById(id);
        response.setContentType("text/html;charset=utf-8");
        return customer;
    }

返回的数据格式:

{
    "cust_address": "北京三里桥",
    "cust_createtime": 1460104321000,
    "cust_id": 16,
    "cust_industry": "2",
    "cust_level": "22",
    "cust_linkman": "马化腾",
    "cust_mobile": "13888888888",
    "cust_name": "刘强东",
    "cust_phone": "0108888887",
    "cust_source": "6",
    "cust_zipcode": "123456"
}

2. 配置 fastjson 后，返回字符串时会在外面强制添加双引号

例如:

1. 如果返回的字符串为 哈哈, 最终返回得到的数据是 "哈哈"
2. 返回的字符串中包含双引号，例如{"name":"ethan"}，则 fastjson处理后，最终返回的结果是 "{\"name\":\"ethan\"}"

要想得到原始字符串,解决办法:
添加配置字符串转换器StringHttpMessageConverter

    <!--注册映射器，适配器，扫描注解-->
    <mvc:annotation-driven conversion-service="conversionService">
        <mvc:message-converters register-defaults="true">
            <!--配置返回字符串，编码设置为UTF-8-->
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes" value = "text/html;charset=UTF-8" />
            </bean>
            <!--配置fastJson-->
            ...
        </mvc:message-converters>
    </mvc:annotation-driven>