4种方法让SpringMVC接收多个对象

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4种方法让SpringMVC接收多个对象.txt
问题背景：1 我要在一个表单里同时一次性提交多名乘客的个人信息到SpringMVC，前端HTML和SpringMVC Controller里该如何处理？第1种方法：表单提交，以字段数组接收；第2种方法：表单提交，以BeanListModel接收；第3种方法：将Json对象序列化成Json字符串提交，以List接收；第4种方法：将表单对象序列化成Json字符串提交，以List接收；第4种方法其实是第3种方法的升级，就是将表单转成Json对象，再转成Json字符串提交；然而，第4种方法还不支持含有多选控件表单的提交，故应该还有第5种加强版的方法。//实体类public class User {      private Integer id;     private String name;     private String pwd;      @Override     public String toString() { }     // .......后面还有getter、setter方法，省略了  }>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>第1种方法：表单提交，以字段数组接收<form action="/user/submitUserList_1" method="post">             ID:<input type="text" name="id"><br/>             Username:<input type="text" name="name"><br/>             Password:<input type="text" name="pwd"><br/><br/>              ID:<input type="text" name="id"><br/>             Username:<input type="text" name="name"><br/>             Password:<input type="text" name="pwd"><br/><br/>             <input type="submit" value="submit">     </form> @RequestMapping(value = "/submitUserList_1", method ={RequestMethod.POST})     @ResponseBody      public String submitUserList_1(HttpServletResponse response,Integer[] id, String[] name, String[] pwd)throws Exception {              String result = "";              if(id == null || id.length <= 0){             return "No any ID.中文";      }              List<User> userList = new ArrayList<User>();              for (int i = 0; i < id.length; i++ )      {                      User user = new User();                      user.setId(id[i]);                      user.setName(name[i]);                      user.setPwd(pwd[i]);                      userList.add(user);              }              result = this.showUserList(userList);              return result;      } >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 第2种方法：表单提交，以BeanListModel接收<form action="/user/submitUserList_2" method="post">              ID:<input type="text" name="users[0].id"><br/>              Username:<input type="text" name="users[0].name"><br/>              Password:<input type="text" name="users[0].pwd"><br/><br/>               ID:<input type="text" name="users[2].id"><br/>              Username:<input type="text" name="users[2].name"><br/>              Password:<input type="text" name="users[2].pwd"><br/><br/>              <input type="submit" value="Submit">     </form>public class UserModel {         private List<User> users;          public List<User> getUsers()     {                     return users;         }          public void setUsers(List<User> users)     {                     this.users = users;         }          public UserModel(List<User> users)     {                     super();                     this.users = users;         }          public UserModel()     {                     super();         }  } @RequestMapping(value = "/submitUserList_2", method ={RequestMethod.POST})     @ResponseBody      public String submitUserList_2(UserModel users) throws Exception {              String result = "";              List<User> userList = users.getUsers();              if(userList == null || userList.size() <= 0)     {             return "No any ID.中文";      }              result = this.showUserList(userList);              return result;      } >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 第3种方法：将Json对象序列化成Json字符串提交，以List接收 <head>      <title>submitUserList_3</title>      <meta http-equiv="content-type" content="text/html; charset=utf-8">      <script language="JavaScript" src="/js/jquery.min.js" ></script>      <script language="JavaScript" src="/js/jquery.json.min.js" ></script>      <script type="text/javascript" language="JavaScript">          function submitUserList_3()  {     alert("ok");                  var customerArray = new Array();                  customerArray.push({id: "1", name: "李四", pwd: "123"});             customerArray.push({id: "2", name: "张三", pwd: "332"});             $.ajax({                          url: "/user/submitUserList_3",                          type: "POST",                          contentType : 'application/json;charset=utf-8', //设置请求头信息         dataType:"json",          data: JSON.stringify(customerArray),            //将Json对象序列化成Json字符串，JSON.stringify()原生态方法data:          $.toJSON(customerArray),                     //将Json对象序列化成Json字符串，toJSON()需要引用jquery.json.min.js          success: function(data){                                 alert(data);                          },                          error: function(res){                                 alert(res.responseText);                         }                  });}     </script>  </head>   <body>      <h1>submitUserList_3</h1>      <input id="submit" type="button" value="Submit" onclick="submitUserList_3();">  </body>  @RequestMapping(value = "/submitUserList_3", method ={RequestMethod.POST})     @ResponseBody       public String submitUserList_3(@RequestBody List<User> users)throws Exception  {               String result = "";               if(users == null || users.size() <= 0)      {          return "No any ID.中文";       }               result = this.showUserList(users);               return result;       }>>>>>>>>>>>>>>>>>>>>>>>>>4.将表单对象序列化成Json字符串提交，以List接收<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"         "http://www.w3.org/TR/html4/loose.dtd"> <html> <head>     <title>submitUserList_4</title>     <meta http-equiv="content-type" content="text/html; charset=utf-8">     <script language="JavaScript" src="/js/jquery.min.js" ></script>     <script type="text/javascript" language="JavaScript">         //将表单序列化成json格式的数据(但不适用于含有控件的表单，例如复选框、多选的select)         (function($){                      $.fn.serializeJson = function(){                          var jsonData1 = {};                          var serializeArray = this.serializeArray();                          // 先转换成{"id": ["12","14"], "name": ["aaa","bbb"], "pwd":["pwd1","pwd2"]}这种形式                          $(serializeArray).each(function () {                              if (jsonData1[this.name]) {                                  if ($.isArray(jsonData1[this.name])) {                             jsonData1[this.name].push(this.value);                                  } else {                                      jsonData1[this.name] = [jsonData1[this.name], this.value];                         }                              } else {                                  jsonData1[this.name] = this.value;                     }                 });                          // 再转成[{"id": "12", "name": "aaa", "pwd":"pwd1"},{"id": "14", "name": "bb", "pwd":"pwd2"}]的形式                          var vCount = 0;                 // 计算json内部的数组最大长度                          for(var item in jsonData1){                             var tmp = $.isArray(jsonData1[item]) ? jsonData1[item].length : 1;                              vCount = (tmp > vCount) ? tmp : vCount;                 }                           if(vCount > 1) {                              var jsonData2 = new Array();                              for(var i = 0; i < vCount; i++){                                  var jsonObj = {};                                  for(var item in jsonData1) {                                      jsonObj[item] = jsonData1[item][i];                         }                                  jsonData2.push(jsonObj);                     }                     return JSON.stringify(jsonData2);                 }else{                              return "[" + JSON.stringify(jsonData1) + "]";                 }                      };                  })(jQuery);                   function submitUserList_4()          {            alert("ok");                         var jsonStr = $("#form1").serializeJson();                         //console.log("jsonStr:rn" + jsonStr);                         //alert(jsonStr);             $.ajax({                             url: "/user/submitUserList_4",                             type: "POST",                              contentType : 'application/json;charset=utf-8',             //设置请求头信息                             dataType:"json",                             data: jsonStr,                             success: function(data){                                     alert(data);                             },                             error: function(res){                                     alert(res.responseText);                             }                     });                  }     </script> </head>  <body>     <h1>submitUserList_4</h1>     <form id="form1">            ID:<input type="text" name="id"><br/>             Username:<input type="text" name="name"><br/>             Password:<input type="text" name="pwd"><br/><br/>              ID:<input type="text" name="id"><br/>             Username:<input type="text" name="name"><br/>             Password:<input type="text" name="pwd"><br/><br/>             <input type="button" value="submit" onclick="submitUserList_4();">     </form> </body> </html>@RequestMapping(value = "/submitUserList_4", method ={RequestMethod.POST})   @ResponseBody     public String submitUserList_4(@RequestBody List<User> users)throws Exception{              String result = "";              if(users == null || users.size() <= 0)     {         return "No any ID.中文";      }              result = this.showUserList(users);              return result;     }>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>总结：第1、2种方法其实都有一个共同的BUG：假如提交三条记录时，前面两条记录的某些字段不填值的话，在SpringMVC里接收不准确了。而且，每2种方法在HMTL中需要给name属性添加[下标]，如果下标有跨度的话（比如第一组控件下标是0,第二组下标是2），那么SpringMVC里其实的是0到2三个对象的，默认下标是1的那个对象全为null值。第3、4种方法最实用。
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