Struts2前台往后台传值

最新推荐文章于 2023-03-27 10:49:32 发布

chessman1974

最新推荐文章于 2023-03-27 10:49:32 发布

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文章标签： java 后端

原文链接：https://my.oschina.net/u/3489648/blog/1036525

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本文详细介绍了在Struts2框架中，从前台页面向后台Action传递参数时遇到的问题及解决方案。主要探讨了如何正确设置URL参数，以便后台能够正确接收并处理。同时，还介绍了实现ModelDriven接口的方法，以简化参数接收流程。

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先写下今天的错误

struts2代码：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
 <package name="user" namespace="" extends="struts-default">
  <action name="updateOrt" class="UserAction" method="updateOrt">
			<result name="success">\html\xiugaiyemian.jsp</result>
  </action>
  <action name="updateUser" class="UserAction" method="updateUser">
			<result name="success">/html/user_update.html</result>
  </action>
 </package>
</struts>

Action代码：

public class UserAction extends ActionSupport{
	
	IService iService;
	User user22;
	List<User> list;
	public void setiService(IService iService) {
		this.iService = iService;
	}
	public User getUser() {
		return user22;
	}
	public void setUser(User user) {
		this.user22 = user;
	}

    //修改用户
	public String updateUser(){
		user22.getId();
		iService.updateUser(user22);
		return "success";
	}
    
    public String updateOrt(){
		System.out.println("---------------"+user22.getId());
//		user22.getId();
//		iService.update(user22);
		return "success";
}

jsp代码：注意错误在这里

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!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">
<title>Insert title here</title>
</head>
<body>
	<h1>查询成功</h1>
	
	<s:iterator var="userList" value="list" status="status">
		ID:<s:property value="#userList.id"/>
		Name:<s:property value="#userList.username"/>
		<s:a href="updateOrt?id=%{#userList.id}">修改</s:a>
		<s:a href="deleteUser?id=%{#userList.id}">删除</s:a><br/>
	</s:iterator>
	<s:debug></s:debug>
</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!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">
<title>Insert title here</title>
</head>
<body>
	<form action="updateUser" method="post">
		<s:property value="user22.username"/>
		<s:property value="user22.id"/>
		<input type="text" name="username">
		<input type="submit" value="修改">
	</form>
</body>
<s:debug></s:debug>
</html>

<!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">
<title>Insert title here</title>
</head>
<body>
	<h1>修改成功</h1>
</body>
</html>

今天出来的错误，前台往后台传值，怎么都传不过去。后来发现是：

<s:a href="updateOrt?id=%{#userList.id}">修改</s:a>

这里写的是id，后端就要定义String id，并且进行强转，很是麻烦。

第二种方法就是改成

<s:a href="updateOrt?user.id=%{#userList.id}">修改</s:a>

这样就能拿到前台传的user的id

第三种方法就是实现ModelDriven<User>接口，代码如下

public class UserAction extends ActionSupport implements ModelDriven<User>{
	
	IService iService;
	User user22;
	List<User> list;
	public void setiService(IService iService) {
		this.iService = iService;
	}
	public User getUser() {
		return user22;
	}
	public void setUser(User user) {
		this.user22 = user;
	}
    @Override
	public User getModel() {
		// TODO Auto-generated method stub
		return user22;
	}
    public String updateOrt(){
		System.out.println("---------------"+user22.getId());
//		user22.getId();
//		iService.update(user22);
		return "success";
		
	}
    //修改用户
	public String updateUser(){
		user22.getId();
		iService.updateUser(user22);
		return "success";
	}
}

注意：

 <form action="test/user.action" method="post">
        <input type="hidden" name="method:add">
        username:<input type="text" name="username"> <br/>
        password:<input type="text" name="password"> <br/>
        age:<input type="text" name="age"> <br/>
        <input type="submit" name="submit" value="添加用户">
     </form> <br/>

不用user.XX

转载于:https://my.oschina.net/u/3489648/blog/1036525