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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
   
     userList=new ArrayList
    
     ();    //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));}
    
   

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