spring mvc 接收表单 bean

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：

1. <?xml version="1.0" encoding="UTF-8" ?>
2. <%@ page language="java" contentType="text/html; charset=UTF-8"
3. pageEncoding="UTF-8"%>
4. <%
5. String path = request.getContextPath();
6. String basePath = request.getScheme() + "://"
7. + request.getServerName() + ":" + request.getServerPort()
8. + path + "/";
9. %>
10. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
11. <html xmlns="http://www.w3.org/1999/xhtml">
12. <head>
13. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
14. <title>Insert title here</title>
15. </head>
16. <body>
17. <center>
18. <font color="red" >${message }</font>
19. <form action="<%=path %>/user/loginVerify">
20. <table>
21. <tr>
22. <td>身份证:</td>
23. <td> <input type="text" name="user.identity"  /> </td>
24. </tr>
25. <tr>
26. <td>用户编号:</td>
27. <td><input type="text" name="user.studentID"  /> </td>
28. </tr>
29. <tr>
30. <td colspan="2">
31. <input type="submit"  value="login"/>
32. </td>
33. </tr>
34. </table>
35. </form>
36. </center>
37. </body>
38. </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>
	&lt;form action="&lt;%=path %&gt;/user/loginVerify"&gt;
		&lt;table&gt;

			&lt;tr&gt;
				&lt;td&gt;身份证:&lt;/td&gt;
				&lt;td&gt; &lt;input type="text" name="user.identity"  /&gt; &lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td&gt;用户编号:&lt;/td&gt;
				&lt;td&gt;&lt;input type="text" name="user.studentID"  /&gt; &lt;/td&gt;
			&lt;/tr&gt;
			&lt;tr&gt;
				&lt;td colspan="2"&gt;
				&lt;input type="submit"  value="login"/&gt;
				&lt;/td&gt;
			&lt;/tr&gt;
		&lt;/table&gt;
	&lt;/form&gt;

&lt;/center&gt;

</body>

</html>

控制器LoginController 中登录的方法：

1. /***
2. * 校验登录用户
3. *
4. * @param session
5. * @param user
6. * @return
7. * @throws UnsupportedEncodingException
8. * @throws Exception
9. */
10. @RequestMapping(value = "/loginVerify")
11. public String login(User user, HttpSession session,
12. Map<String, Object> map,Model model) throws UnsupportedEncodingException,
13. Exception {
14. User user2 = null;
15. if (user.getIdentity() == null) {
16. map.put("message", "请输入身份证");
17. return "loginInput";
18. }
19. map.put("identity", user.getIdentity());
20. model.addAttribute("identity", user.getIdentity());
21. System.out.println("identity:"+session.getAttribute("identity"));
22. user2 = this.userDao.getByIdentityAndStudentID(new User(user.getIdentity(),
23. user.getStudentID()));
24. System.out.println("user2:" + user2);
25. if (user2 != null) {
26. return "welcome";
27. } else {
28. map.put("message", "身份证和用户编号有误，请重新登录");
29. return "loginInput";
30. }
31. }

/***
	 * 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;
}

}

原来，spring MVC 跟struts2的注入方式不一样！！
后来我把页面中的name属性改为identity 和studentID 就好了：
<tr>
<td>身份证:</td>
<td> <input type="text" name="identity"  /> </td>
</tr>
<tr>
<td>用户编号:</td>
<td><input type="text" name="studentID"  /> </td>
</tr>
这就是spring MVC与struts2 ioc不同的地方！