问题背景:
我要在一个表单里同时一次性提交多名乘客的我的信息到SpringMVC,前端HTML和SpringMVC Controller里该如何处理?javascript
以上4种方法都共用同一个User实体类,代码以下:html
public class User {
private Integer id;
private String name;
private String pwd;前端
@Override
public String toString() {
return “User{” +
“id=” + id +
“, name=’” + name + ‘’’ +
“, pwd=’” + pwd + ‘’’ +
‘}’;
}
// …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
HTML代码以下:java
<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>Java代码以下:jquery
@RequestMapping(value = “/submitUserList_1”, method ={RequestMethod.POST})第2种方法:表单提交,以BeanListModel接收
@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;
}
<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>
Java代码:
除了刚才公用的User类,还要封装一个User的容器类UserModel:web
public class UserModel {
private List<User> users;
public List<User> getUsers() {
return users;
}ajax
public void setUsers(List<User> users) {
this.users = users;
}json
public UserModel(List<User> users) {
super();
this.users = users;
}数组
public UserModel() {
super();
}app
}SpringMVC Controller方法:
@RequestMapping(value = “/submitUserList_2”, method ={RequestMethod.POST})第4种方法:将表单对象序列化成Json字符串提交,以List接收
@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;
}
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:\r\n” + 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” οnclick=“submitUserList_4();”>
</form>
</body>
</html>Java代码:
@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: 第一、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里接收不许确了。并且,每2种方法在HMTL中须要给name属性添加[下标],若是下标有跨度的话(好比第一组控件下标是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。 第三、4种方法最实用。