spring mvc如何优雅的使用fastjson

1. 在spring mvc中配置fastjson

<!-- 设置配置方案 -->
    <mvc:annotation-driven>
        <!-- 设置不使用默认的消息转换器 -->
        <mvc:message-converters register-defaults="false">
            <!-- 配置Spring的转换器, 字符编码 -->
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8" index="0"/>
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/plain;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
            <bean class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"/>
            <!--配置fastjson中实现HttpMessageConverter接口的转换器-->
            <bean id="fastJsonHttpMessageConverter"
                  class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <!-- 加入支持的媒体类型：返回contentType -->
                <property name="supportedMediaTypes">
                    <list>
                        <!-- 这里顺序不能反，一定先写text/html,不然ie下会出现下载提示 -->
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
                <!--枚举类型，对于返回List集合中引用同一个对象，忽略引用检测【注意不要出现循环引用现象】-->
                <property name="features">
                    <list>
                        <value>DisableCircularReferenceDetect</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

2. 使用方法

    // 文章details
    @RequestMapping(value = "/detail", method = RequestMethod.GET)
    public String detail(Long id, Model model, HttpServletRequest request){
        Article article = articleService.getArticleById(id, request);

        Teacher teacher = (Teacher) request.getSession().getAttribute("teacher");
        if(teacher==null){
            return "login.jsp";
        }
        // role : 1-teacher
        ArticleZan zan = articleService.getZan(article.getArticle_id(), 1, teacher.getTe_id());
        model.addAttribute("article", article);
        model.addAttribute("zan",zan);
        return "article/detail.jsp";
    }

　　{"id":1}  ->可以完成参数疯转

　　

　　对于普通的参数，fastjson可以完成参数封装和类型转换。但是对于JSON数据中有数组就无能为力了：例如：

　　解决办法：

   @CrossOrigin(origins = "*", maxAge = 3600)
    @RequestMapping(value = "/getArticles")
    @ResponseBody
    public Object getArticles(Long[] id, @RequestBody JSONObject[] obj, HttpServletRequest request){
        Set<Long> ids = new HashSet<>();
        for (JSONObject o :
                obj) {
            ids.add(o.getLong("id"));
        }
        List<Article> articles = articleService.getArticles(ids, request);
        return articles;
    }

end