学步园

//生成Gson对象，把对象及其属性对象转换为Json字符串，
  //解决子属性对象的无限递归问题，只转换我们用标签暴露的对象类型
  Gson g = new GsonBuilder()
      .excludeFieldsWithoutExposeAnnotation()
      .serializeNulls()
      .setDateFormat(DateFormat.LONG)
      .setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
      .setPrettyPrinting()
      .setVersion(1.0)
      .create();
  
  String jsonResult = g.toJson(sysUser.getPageResult());
  System.out.println(jsonResult);
  
  response.setContentType("application/json;charset=utf-8");
  response.setHeader("Cache-Control", "no-cache");
  
  PrintWriter out = response.getWriter();
  out.print(jsonResult);
  out.flush();
  out.close();