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：

Html代码

<?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>
	&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：

Java代码

/***
* 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：
Java代码  
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！

posted @ 2018-05-03 17:18 星朝阅读(1863) 评论(0) 编辑收藏举报

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spring mvc 接收表单 bean

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