SpringMVC返回json数据的配置方式

Spring MVC返回json数据的方式有以下几种：
(1)直接 PrintWriter 输出
(2)使用 JSP 视图
(3)使用Spring内置的支持。

---

直接 PrintWriter 输出

    @RequestMapping(value = "/getPojoJson.do", method = RequestMethod.GET)
    public void test(HttpServletResponse res) throws IOException {
        res.setContentType("text/html;charset=utf-8");
        PrintWriter writer = res.getWriter();

        Gson gson = new Gson();
        Teacher teacher = new Teacher();
        teacher.setId(1);
        teacher.setName("苍老师");
        teacher.setAge(32);

        String json = gson.toJson(teacher);
        writer.print(json);
        writer.close();
    }

2.略

3.Spring的@RequestBody注解(分默认和自定义)

    /** 默认的方法 */
    @RequestMapping(value = "/getPojoJson.do", method = RequestMethod.GET)
    public @ResponseBody Teacher test() throws IOException {
        Teacher teacher = new Teacher();
        teacher.setId(1);
        teacher.setName("苍老师");
        teacher.setAge(32);

        return teacher;
    }

自定义需要修改 HandlerMapping和HandlerAdapter 的HttpMessageConverter
见:http://blog.youkuaiyun.com/wangxy799/article/details/50952969