一個表單中有多個相同的欄位,以及springmvc接收多個相同物件問題
問題背景:
我要在一個表單裡同時一次性提交多名乘客的個人資訊到SpringMVC,前端HTML和SpringMVC Controller裡該如何處理?
- 第1種方法:表單提交,以欄位陣列接收;
- 第2種方法:表單提交,以BeanListModel接收;
- 第3種方法:將Json物件序列化成Json字串提交,以List接收;
- 第4種方法:將表單物件序列化成Json字串提交,以List接收;
第4種方法其實是第3種方法的升級,就是將表單轉成Json物件,再轉成Json字串提交;
然而,第4種方法還不支援含有多選控制元件表單的提交,故應該還有第5種加強版的方法。
以上4種方法都共用同一個User實體類,程式碼如下:
[java] view plain copy print ?- public
- private Integer id;
- private String name;
- private String pwd;
- @Override
- public String toString() {
- return "User{" +
- "id=" + id +
- ", name='" + name + '\'' +
- ", pwd='" + pwd + '\'' +
- '}';
- }
- // .......後面還有getter、setter方法,省略了
- }
public class User {
private Integer id;
private String name;
private String pwd;
@Override
public String toString() {
return “User{” +
“id=” + id +
“, name=’” + name + ‘’’ +
“, pwd=’” + pwd + ‘’’ +
‘}’;
}
// …後面還有getter、setter方法,省略了
}第1種方法:表單提交,以欄位陣列接收
HTML程式碼如下:
- <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>
<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程式碼如下:
- @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;
- }
@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種方法:表單提交,以BeanListModel接收
HTML程式碼如下: [java] view plain copy print ?
- <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>
<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程式碼:
除了剛才公用的User類,還要封裝一個User的容器類UserModel:
- 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();
- }
- }
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();
}
}SpringMVC Controller方法:
[java] view plain copy print ?- @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;
- }
@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4種方法:將表單物件序列化成Json字串提交,以List接收
HTML程式碼: [java] view plain copy print ?
- <!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”>
- //將表單序列化成json格式的資料(但不適用於含有控制元件的表單,例如複選框、多選的select)
- (function(KaTeX parse error: Expected '}', got '&' at position 3: ){&̲nbsp; </sp….fn.serializeJson = function(){
- var jsonData1 = {};
- var serializeArray = this.serializeArray();
- // 先轉換成{“id”: [“12”,“14”], “name”: [“aaa”,“bbb”], “pwd”:[“pwd1”,“pwd2”]}這種形式
- KaTeX parse error: Expected 'EOF', got '&' at position 31: …).each(function&̲nbsp;() {&….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;
- }
- });
- // 再轉成[{“id”: “12”, “name”: “aaa”, “pwd”:“pwd1”},{“id”: “14”, “name”: “bb”, “pwd”:“pwd2”}]的形式
- var vCount = 0;
- // 計算json內部的陣列最大長度
- for(var item in jsonData1){
- var tmp = KaTeX parse error: Expected 'EOF', got '&' at position 26: …sonData1[item])&̲nbsp;? jso…("#form1").serializeJson();
- //console.log(“jsonStr:\r\n” + jsonStr);
- //alert(jsonStr);
- KaTeX parse error: Expected '}', got '&' at position 8: .ajax({&̲nbsp; </sp…){
$.fn.serializeJson = function(){
var jsonData1 = {};
var serializeArray = this.serializeArray();
// 先轉換成{“id”: [“12”,“14”], “name”: [“aaa”,“bbb”], “pwd”:[“pwd1”,“pwd2”]}這種形式
KaTeX parse error: Expected '}', got 'EOF' at end of input: … 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;
}
});
// 再轉成[{“id”: “12”, “name”: “aaa”, “pwd”:“pwd1”},{“id”: “14”, “name”: “bb”, “pwd”:“pwd2”}]的形式
var vCount = 0;
// 計算json內部的陣列最大長度
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:\r\n” + jsonStr);
//alert(jsonStr);
$.ajax({
url: “/user/submitUserList_4”,
type: “POST”,
contentType : ‘application/json;charset=utf-8’, //設定請求頭資訊
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>Java程式碼:
- @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;
- }
@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;
}
[java] view plain copy print ?
- 總結:
- 第1、2種方法其實都有一個共同的BUG:假如提交三條記錄時,前面兩條記錄的某些欄位不填值的話,在SpringMVC裡接收不準確了。而且,每2種方法在HMTL中需要給name屬性新增[下標],如果下標有跨度的話(比如第一組控制元件下標是0,第二組下標是2),那麼SpringMVC裡其實的是0到2三個物件的,預設下標是1的那個物件全為null值。
- 第3、4種方法最實用。
總結:
第1、2種方法其實都有一個共同的BUG:假如提交三條記錄時,前面兩條記錄的某些欄位不填值的話,在SpringMVC裡接收不準確了。而且,每2種方法在HMTL中需要給name屬性新增[下標],如果下標有跨度的話(比如第一組控制元件下標是0,第二組下標是2),那麼SpringMVC裡其實的是0到2三個物件的,預設下標是1的那個物件全為null值。
第3、4種方法最實用。
問題背景:
我要在一個表單裡同時一次性提交多名乘客的個人資訊到SpringMVC,前端HTML和SpringMVC Controller裡該如何處理?
- 第1種方法:表單提交,以欄位陣列接收;
- 第2種方法:表單提交,以BeanListModel接收;
- 第3種方法:將Json物件序列化成Json字串提交,以List接收;
- 第4種方法:將表單物件序列化成Json字串提交,以List接收;
第4種方法其實是第3種方法的升級,就是將表單轉成Json物件,再轉成Json字串提交;
然而,第4種方法還不支援含有多選控制元件表單的提交,故應該還有第5種加強版的方法。
以上4種方法都共用同一個User實體類,程式碼如下:
[java] view plain copy print ?- public class User {
- private Integer id;
- private String name;
- private String pwd;
- @Override
- public String toString() {
- return "User{" +
- "id=" + id +
- ", name='" + name + '\'' +
- ", pwd='" + pwd + '\'' +
- '}';
- }
- // .......後面還有getter、setter方法,省略了
- }
public class User {