阿里fastjson包的一些简单例子,SSM,json格式化

Maven仓库导包

<!--Json格式化工具-->

<dependency>

    <groupId>com.alibaba</groupId>

    <artifactId>fastjson</artifactId>

    <version>1.2.13</version>

</dependency>

使用例子

@RequestMapping("/json/idea")

   @ResponseBody  //直接返回实体类

   public Idea findIdeaJson(int id){

      return service.findOne(id);

   }

   @RequestMapping("/json/idea2")

   @ResponseBody    //把返回值输出成json数据

   public Map<String,Object> findIdeaJson2(int id){//使用Map键值对存入需要的字段成json格式

      Idea idea = service.findOne(id);

      Map<String,Object> map = new HashMap<String, Object>();

      map.put("deptname", idea.getEmp().getDept().getName());

      map.put("createtime", idea.getCreatetime());

      map.put("title", idea.getTitle());

      return map;

   }

   @RequestMapping(value="/json/idea3",produces="application/json;charset=UTF-8")

   @ResponseBody  //把返回值输出成json数据

   public String findIdeaJson3(int id){//拼字符串成json格式

      Idea idea = service.findOne(id);

      StringBuilder sb = new StringBuilder("{");

      sb.append("\"name\":");       

      sb.append("\"");

      sb.append(idea.getEmp().getName());

      sb.append("\"");

      sb.append(",\"deptname\":");

      sb.append("\"");

      sb.append(idea.getEmp().getDept().getName());

      sb.append("\"");

      sb.append("}");

      return sb.toString();  

   }

   @RequestMapping(value="/json/idea4",produces="application/json;charset=UTF-8")

   @ResponseBody  //把返回值输出成json数据

   public String findIdeaJson4(int id){ //使用fastjson的过滤类过滤不要的字段

      Idea idea = service.findOne(id);

      SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Idea.class);

      filter.getIncludes().add("title");

      filter.getIncludes().add("emp");

      filter.getIncludes().add("createtime");

      SimplePropertyPreFilter filter2 = new SimplePropertyPreFilter(Emp.class);

      filter2.getIncludes().add("id");

      filter2.getIncludes().add("name");

      String json = JSON.toJSONString(idea,new SimplePropertyPreFilter[]{filter,filter2});

      return json;

   }

   @RequestMapping(value="/json/idea5",produces="application/json;charset=UTF-8")

   @ResponseBody  //把返回值输出成json数据

   public String findIdeaJson5(int id){

      Idea idea = service.findOne(id);

      SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Idea.class,"title","createtime","emp");

      SimplePropertyPreFilter filter2 = new SimplePropertyPreFilter(Emp.class,"id","name");

      String json = JSON.toJSONString(idea,new SimplePropertyPreFilter[]{filter,filter2});

      return json;

   }

   @RequestMapping(value="/json/idea6",produces="application/json;charset=UTF-8")

   @ResponseBody  //把返回值输出成json数据

   public String findIdeaJson6(){

      List<Idea> list = service.findAll();

      SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Idea.class,"title","createtime","emp");

      SimplePropertyPreFilter filter2 = new SimplePropertyPreFilter(Emp.class,"id","name");

      String json = JSON.toJSONString(list,new SimplePropertyPreFilter[]{filter,filter2});

      return json;

   }