spring mvc 接收表单 bean

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spring MVC如何接收表单bean 呢？

之前项目中MVC框架一直用struts2，所以我也就按照struts2 的思维来思考

页面loginInput.jsp：

<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
</head>
<body>
<center>
<font color="red" >${message }</font>
<form action="<%=path %>/user/loginVerify">
<table>
<tr>
<td>身份证:</td>
<td> <input type="text" name="user.identity" /> </td>
</tr>
<tr>
<td>用户编号:</td>
<td><input type="text" name="user.studentID" /> </td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="login"/>
</td>
</tr>
</table>
</form>
</center>
</body>
</html>

<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Insert title here</title>
</head>
<body>
<center>
<font color="red" >${message }</font>

<form action="<%=path %>/user/loginVerify"> <table><tr> <td>身份证:</td> <td> <input type="text" name="user.identity" /> </td> </tr> <tr> <td>用户编号:</td> <td><input type="text" name="user.studentID" /> </td> </tr> <tr> <td colspan="2"> <input type="submit" value="login"/> </td> </tr> </table> </form></center>

</body>

</html>

控制器LoginController 中登录的方法：

/***
* 校验登录用户
*
* @param session
* @param user
* @return
* @throws UnsupportedEncodingException
* @throws Exception
*/
@RequestMapping(value = "/loginVerify")
public String login(User user, HttpSession session,
Map<String, Object> map,Model model) throws UnsupportedEncodingException,
Exception {
User user2 = null;
if (user.getIdentity() == null) {
map.put("message", "请输入身份证");
return "loginInput";
}
map.put("identity", user.getIdentity());
model.addAttribute("identity", user.getIdentity());
System.out.println("identity:"+session.getAttribute("identity"));
user2 = this.userDao.getByIdentityAndStudentID(new User(user.getIdentity(),
user.getStudentID()));
System.out.println("user2:" + user2);
if (user2 != null) {
return "welcome";
} else {
map.put("message", "身份证和用户编号有误，请重新登录");
return "loginInput";
}
}

/***
* 校验登录用户
*
* @param session
* @param user
* @return
* @throws UnsupportedEncodingException
* @throws Exception
*/
@RequestMapping(value = "/loginVerify")
public String login(User user, HttpSession session,
Map<String, Object> map,Model model) throws UnsupportedEncodingException,
Exception {
User user2 = null;
if (user.getIdentity() == null) {
map.put("message", "请输入身份证");
return "loginInput";
}
map.put("identity", user.getIdentity());
model.addAttribute("identity", user.getIdentity());
System.out.println("identity:"+session.getAttribute("identity"));
user2 = this.userDao.getByIdentityAndStudentID(new User(user.getIdentity(),
user.getStudentID()));
System.out.println("user2:" + user2);
if (user2 != null) {
return "welcome";
} else {
map.put("message", "身份证和用户编号有误，请重新登录");
return "loginInput";
}

}</pre>

我认为页面表单中name为user.identity 和user.studentID的元素会自动注入到上述方法的变量User user 中，结果没有！！！？

实体类User：

package com.springmvc.entity;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
/***
* father class
* @author huangwei
*
*/
@Entity
public class User {
private int id;
/**
* 身份证
*/
private String identity;
/***
* 用户编号
*/
private String studentID;
private String username;
public User() {
super();
}
public User(String identity, String studentID) {
super();
this.identity = identity;
this.studentID = studentID;
}
@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getIdentity() {
return identity;
}
public void setIdentity(String identity) {
this.identity = identity;
}
public String getStudentID() {
return studentID;
}
public void setStudentID(String studentID) {
this.studentID = studentID;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}

package com.springmvc.entity;import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;/***

father class
@author huangwei

/

@Entity

public class User {

private int id;

/*

* 身份证

/

private String identity;

/**

* 用户编号

*/

private String studentID;

private String username;

public User() { super(); }public User(String identity, String studentID) { super(); this.identity = identity; this.studentID = studentID; }@Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getIdentity() { return identity; }public void setIdentity(String identity) { this.identity = identity; }public String getStudentID() { return studentID; } public void setStudentID(String studentID) { this.studentID = studentID; }public String getUsername() { return username; }public void setUsername(String username) { this.username = username; }