spring mvc 接收表單 bean

本文轉載自查看原文 2018-05-03 17:18 1524 開發經驗/ SpringMVC/ 開發技巧

spring MVC如何接收表單bean 呢？

之前項目中MVC框架一直用struts2，所以我也就按照struts2 的思維來思考

頁面loginInput.jsp：

Html代碼

<?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>身份證:</td>
<td> <input type="text" name="user.identity" /> </td>
</tr>
<tr>
<td>用戶編號:</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>
	&lt;form action="&lt;%=path %&gt;/user/loginVerify"&gt;
		&lt;table&gt;

			&lt;tr&gt;
				&lt;td&gt;身份證:&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;用戶編號:&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 中登錄的方法：

Java代碼

/***
* 校驗登錄用戶
*
* @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", "請輸入身份證");
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", "身份證和用戶編號有誤，請重新登錄");
return "loginInput";
}
}

/***
	 * 校驗登錄用戶
	 * 
	 * @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", "請輸入身份證");
			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", "身份證和用戶編號有誤，請重新登錄");
			return "loginInput";
		}
}</pre>

 我認為頁面表單中name為user.identity 和user.studentID的元素會自動注入到上述方法的變量User user 中，結果沒有！！！？
實體類User：

   
   
  
 
 
         
    
    
   
  
  
           
           
             Java代碼 
              
             
            
          
    
    
   
  
  
           
           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;   
               /**  
                * 身份證  
                */   
               private String identity;   
               /***  
                * 用戶編號  
                */   
               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;
 /*

* 身份證

/
 private String identity;
 /**

* 用戶編號

*/

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;
}

}


 
原來，spring MVC 跟struts2的注入方式不一樣！！
后來我把頁面中的name屬性改為identity 和studentID 就好了：
<tr>
<td>身份證:</td>
<td> <input type="text" name="identity"  /> </td>
</tr>
<tr>
<td>用戶編號:</td>
<td><input type="text" name="studentID"  /> </td>
</tr>
 
這就是spring MVC與struts2 ioc不同的地方！

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