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Spring MVC 多选框绑定 Entity 中的 list 属性

2015-10-28 10:55 519 查看

问题描述：

有两个类：Record.java 和 User.java，Record中有个attenders属性，是List<User>类型。

我想绑定Record中的attenders。网上查了下，没有满意的结果，于是自己写了个简单的方法。

具体代码如下：

Record.java

public class Record {

public List<User> getAttenders() {
return attenders;
}
public void setAttenders(List<User> attenders) {
this.attenders = attenders;
}
public int getRecordId() {
return recordId;
}
public void setRecordId(int recordId) {
this.recordId = recordId;
}

public String getRecordName() {
return recordName;
}
public void setRecordName(String recordName) {
this.recordName = recordName;
}

private List<User> attenders;
private int recordId;
private String recordName;

}

User.java

public class User {

public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
private int userId;
private String userName;

}

MultiSelect.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<title>main page</title>
<script type="text/javascript" src="js/jquery-1.6.4.min.js"></script>
<script type="text/javascript" src="js/jquery-ui-1.8.16.custom.min.js"></script>

<script type="text/javascript">
function check(){
var index = 0;
$.each(
$('#attenderSelect :selected'),function(){
var input = $('<input>');
input.attr("name","attenders["+index+"].userId");
input.attr("type","hidden");
input.attr("value",$(this).val());
$('#attenderSelect').append(input);
index ++;
}
);
}

</script>

</head>
<body>

<input name="" type="hidden" value="">

<form:form action="./user.htm?method=multiSelect" method="post">
<table>
<tr>
<td>
<select id="attenderSelect" name="attenders.userId" multiple="multiple">
<c:forEach var="user" items="${userList }">
<option value="${user.userId}" >${user.userName }</option>
</c:forEach>
</select>
</td>
</tr>

<tr>
<td>
<input type="text" name="recordName">
</td>
</tr>

<tr>
<td>
<input type="submit" value="submit" onclick="check()">
</td>
</tr>

</table>
</form:form>

</body>
</html>

Controller method:

public class UserFormController extends MultiActionController {

public ModelAndView multiSelect(HttpServletRequest request,
HttpServletResponse response) throws Exception {

Record record = (Record) newCommandObject(Record.class);
bind(request,record);

//        if(record.getAttenders() != null)
//        for(User user : record.getAttenders()){
//            System.out.println(user.getUserId());
//        }

ModelAndView mav = new ModelAndView("index");
return mav;

}
}

通过在提交表单时，创建一些隐藏的 input ，并命名为 attenders[index].userId，这样就达到了将数据绑定到对象的目的了

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Spring MVC 多选框 绑定 Entity 中的 list 属性

Spring MVC 多选框绑定 Entity 中的 list 属性