Struts2 数据封装机制-优快云博客

本文链接：https://blog.youkuaiyun.com/minihoop/article/details/50738188

本文详细介绍了如何使用Struts2框架实现登录功能，包括数据封装、属性驱动和模型驱动三种方式，以及Struts2标签的引入。通过实践示例，展示了如何将前端输入的数据自动封装为实体类，并在后台进行处理。

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传统数据封装

使用servlet接受请求，从HttpServletRequest对象中获取提交的数据，封装成一个实体类的对象

属性驱动

数据自动获取

实例

action.LoginAction.java

package action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
	private String username;
	private String password;
	@Override
	public String execute() throws Exception {
		System.out.println(username);
		System.out.println(password);
		return "success";
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	

	
}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
   
  </head>
  
  <body>
	<form method="post"action="<%=path %>/LoginAction.action">
	name:<input type="text" name="username">
	password:<input type="password" name="password">
	<button type="submit">submit</button>
	</form>
  </body>
</html>

welcome.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
   
  </head>
  
  <body>
    welcome<br>
  </body>
</html>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<package name="login"  extends="struts-default">
<action name="LoginAction" class="action.LoginAction">
<result name="success">/welcome.jsp</result>
</action>

</package>

</struts>

模型驱动

自动封装

bean.User.java

package bean;

public class User {
	private String username;
	private String password;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	

}

action.MLoginAction.java

package action;

import bean.User;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class MLoginAction extends ActionSupport implements ModelDriven<User>{
	private User user=new User();
	
	@Override
	public String execute() throws Exception {
		System.out.println(user.getUsername());
		System.out.println(user.getPassword());
		return "success";
	}

	@Override
	public User getModel() {
		
		return user;
	}

}

strtus.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<package name="user" extends="struts-default">
<action name="loginAction" class="action.MLoginAction">
<result name="success">/welcome.jsp</result>
<interceptor-ref name="modelDriven"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
</package>
</struts>

struts2 标签引入

SLoginAction.java

package action;

import bean.User;

import com.opensymphony.xwork2.ActionSupport;

public class SLoginAction extends ActionSupport {
	private User user;
	@Override
	public String execute() throws Exception {
		System.out.println(user.getUsername());
		System.out.println(user.getPassword());
		return "success";
	}
	public User getUser() {
		return user;
	}
	public void setUser(User user) {
		this.user = user;
	}
	
}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>
  
  <body>
   
   <s:form method="post" namespace="/useLogin" action="SLoginAction">
   username:<s:textfield name="user.username" />
   password:<s:password name="user.password" />
   <s:submit value="submit"/>
   </s:form>
  </body>
</html>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.ui.theme" value="simple"></constant>
<constant name="struts.ui.templateDir" value="template"></constant>
<constant name="struts.ui.templateSuffix" value="ftl"></constant>
<package name="user" extends="struts-default">
<action name="loginAction" class="action.MLoginAction">
<result name="success">/welcome.jsp</result>
<interceptor-ref name="modelDriven"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
<action name="SLoginAction" class="action.SLoginAction">
<result name="success">/welcome.jsp</result>
</action>
</package>

</struts>