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Struts2接受参数

2016-02-04 22:10 609 查看

Struts2接受参数有三种方法

1、使用Action的属性来接受

——就是在一个Action里面定义许多前台需要接受的属性（属性名要一致）

如jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'login.jsp' starting page</title>
</head>
<body>
<form action="LoginAction.action" method="post">
账号：<input type="text" name="username"><br>
密码：<input type="password" name="password">
<input type="submit" value="提交">
</form>
</body>
</html>

相应的Action的代码

package com.xingyao.www.action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

private static final long serialVersionUID = 1L;

private String username;
private String password;

public String login(){
System.out.println(username);
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;
}

public static long getSerialversionuid() {
return serialVersionUID;
}

}

对应的Struts.xml的配置

<action name="LoginAction" method="login" class="com.xingyao.www.action.LoginAction">
<!-- 配置返回结果名为SUCCESS,则服务器跳转到index.jsp -->
<result name="SUCCESS">index.jsp</result>
</action>

2、使用Domain Model接受参数

—–将后台需要接受的参数用一个model来封装，然后在Action里面把model作为一个属性来接受前台数据

model对象
package com.xingyao.www.po;
import java.util.List;
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类的写法
package com.xingyao.www.action;

import com.opensymphony.xwork2.ActionSupport;
import com.xingyao.www.po.User;

public class LoginAction1 extends ActionSupport {

private static final long serialVersionUID = 1L;

private User user;

public String login() {
System.out.println(user.getUsername());
return "SUCCESS";
}

public User getUser() {
return user;
}

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

public static long getSerialversionuid() {
return serialVersionUID;
}
}

由于多个model可能有相同的属性，所以需要在jsp页面指定你的参数是属于哪个model对象的

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'login.jsp' starting page</title>
</head>

<body>
<form action="LoginAction1.action" method="post">
账号：<input type="text" name="user.username"><br>
密码：<input type="password" name="user.password">
<input type="s
c410
ubmit" value="提交">
</form>
</body>
</html>

3、使用ModelDriven接受参数，推荐使用

将Action实现一个ModelDriven接口

—-Action的代码

package com.xingyao.www.action;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.xingyao.www.po.User;

//T:封装参数的model
public class LoginAction2 extends ActionSupport implements ModelDriven<User> {

private static final long serialVersionUID = 1L;
private User user = new User();

public String login() {
System.out.println(user.getUsername());
System.out.println(user.getBooks().get(0));
System.out.println(user.getBooks().get(1));
return "SUCCESS";
}

@Override
public User getModel() {
// TODO Auto-generated method stub
return user;
}
}

—-jsp的配置

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'login.jsp' starting page</title>
</head>

<body>
<form action="LoginAction2.action" method="post">
账号：<input type="text" name="username"><br>
密码：<input type="password" name="password">
书籍1：<input type="password" name="books[0]">
密码：<input type="password" name="books[1]">
<input type="submit" value="提交">
</form>
</body>
</html>

—-model的配置

package com.xingyao.www.po;

import java.util.List;

public class User {

private String username;
private String password;
private List<String> books;

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;
}
public List<String> getBooks() {
return books;
}
public void setBooks(List<String> books) {
this.books = books;
}
}

方法一的缺点：影响了数据的封装性，使得一个整体对象成了零散的属性进行传递，不符合面向对象的思维

方法二的缺点：前台的数据一定要指定对象类型，如果后台改变了model的名称，前台需要随着变化，不利于代码的维护

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标签： struts2.0

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