Struts2传参的三种方法

1.使用Action的属性接收参数

1）.创建视图

login.jsp

<body>
	<h2>用户登录</h2>
	<form action="UserLogin" method="post">
		用户名：<input type="text" name="username" /><br />
		密码：<input type="password" name="password" /><br />
		<input type="submit" value="登录" />
	</form>
</body>

welcome.jsp

<body>
	Successful user login!
</body>

2）.创建Action
LoginAction.java

package org.bigjava.web.action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

	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;
	}

	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		System.out.println("用户名：" + username + "密码：" + password);

		return SUCCESS;
	}

}

3).编辑struts.xml文件
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>
	<!-- 启用开发者模式，反馈跟多错误信息 -->
	<constant name="dev.Mode" value="true" />
	
	<package name="login" extends="struts-default" namespace="/">
		<action name="UserLogin" class="org.bigjava.web.action.LoginAction">
			<result>
				/welcome.jsp
			</result>
		</action>
	</package>
	
</struts>    

5).把项目部署到tomcat上
浏览器访问http://127.0.0.1:8080/Struts2_TransferParam/login.jsp


控制台输出用户名和密码

2.使用DomainModle接受参数

1).创建视图
login.jsp

<body>
<h2>用户登录</h2>
	<form action="UserLogin" method="post">
		用户名：<input type="text" name="user.username" /><br />
		密&nbsp;码：<input type="password" name="user.password" /><br />
		<input type="submit" value="登录" />
	</form>
</body>

welcome.jsp同上不变
2).创建User实体类
User.java

package org.bigjava.entity;

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;
	}

}

3).创建Action
LoginAction.java

package org.bigjava.web.action;

import org.bigjava.entity.User;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

	private User user;

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		System.out.println("用户名：" + user.getUsername() + " 密码：" + user.getPassword());

		return SUCCESS;
	}

}

4).编辑struts2.xml(同上）
5).把项目部署到tomcat服务器上浏览器访问http://127.0.0.1:8080/Struts2_TransferParam/login.jsp

3.使用ModerDriven接收参数

1).创建视图
login.jsp

<body>
	<h2>用户登录</h2>
	<form action="UserLogin" method="post">
		用户名：<input type="text" name="username" /><br />
		密&nbsp;码：<input type="password" name="password" /><br />
		<input type="submit" value="登录" />
	</form>
  </body>

welcome.jsp同上
2).创建Action
LoginAction.java

package org.bigjava.web.action;

import org.bigjava.entity.User;

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

public class LoginAction extends ActionSupport implements ModelDriven<User> {
	// 数据模型对象实例化
	private User user = new User();

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		System.out.println("用户名：" + user.getUsername() + " 密码：" + user.getPassword());

		return SUCCESS;
	}

	// 实例化接口方法，返回我们的数据模型对象
	@Override
	public User getModel() {
		// TODO Auto-generated method stub
		return user;
	}

}

3).创建实体类
User.java同上
4).编辑struts.xml（同上）
5).把项目部署到tomcat服务器上浏览器访问http://127.0.0.1:8080/Struts2_TransferParam/login.jsp