Springmvc输出json格式的数据

把对象转化成json，直接打印输出就可以了。

@RequestMapping(value = "/showUserListByJson")
public void showUserListInJson(HttpServletResponse response) throws Exception{
    List<User> userList=new ArrayList<User>();
    //User(Integer id,String loginname,String password,String username,String phone,String address)
    User user=new User(1,"jack","123456","杰克","324","浙江大学");
    userList.add(user);
    user=new User(2,"tom","32423","汤姆","42352","浙江大学");
    userList.add(user);
    ObjectMapper mapper=new ObjectMapper();
    response.setContentType("text/html;charset=UTF-8");
    response.getWriter().print(mapper.writeValueAsString(userList));
}