Structs接收参数的三种方式Model，ModelDriver

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Structs接收参数

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1使用Action的属性接收参数

新建一个页面，来输入数据
login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>    <%@ taglib prefix="s" uri="/struts-tags"%><!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="LoginAction.action" method="post">        用户名：<input type="text" name="username"> <br>            密码：<input type="password" name="password"><br>        <input type="submit" value="提交"/>    </form></body></html>

参数的名称和Action属性的名称相同

LoginAction.java

//package com.struts2.action;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport {    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;    }}

action的配置

    <action name="LoginAction" method="login" class="com.struts2.action.LoginAction">            <result >/success.jsp</result>    </action>

success.jsp，只是用来测试，可以随意跳转存在的页面

结果：
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十一月 12, 2016 10:09:17 下午 org.apache.jasper.compiler.TldLocationsCache tldScanJar信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.天猫双十一

在success.jsp页面中，也能通过下面的代码取得数据

${username} &nbsp;${password}

2使用DomaimModel接收参数

使用JavaBean来封装属性,把get/set方法放到实体类中

    private String username;    private String password;

User.java

//package com.struts2.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;    }}

login.jsp

<form action="LoginAction.action" method="post">        用户名：<input type="text" name="user.username">        密码：<input type="password" name="user.password"><br>         <input type="submit" value="提交"/>    </form>

参数应该是对象名.属性，其中对象名指的是Action属性，为一个类的对象，整型和Date类型（格式必须正确），都可以默认的做类型转换

LoginAction.java

public class LoginAction extends ActionSupport {    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;    }}

和方法一本质相同，进行了一些封装
在success.jsp页面中，也能通过下面的代码取得数据

${user.username} &nbsp;${user.password}

3使用ModelDriver接收参数

User.java

public class User {    private String username;    private String password;    //加入了其他类型的数据    private List<String> bookList;    private List<User> msg;     public List<User> getMsg() {        return msg;    }    public void setMsg(List<User> msg) {        this.msg = msg;    }    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> getBookList() {        return bookList;    }    public void setBookList(List<String> bookList) {        this.bookList = bookList;    }}

login.jsp

<form action="LoginAction.action" method="post">        用户名：<input type="text" name="username"></br>        书籍1：<input type="text" name="bookList[0]"><br>        书籍2：<input type="text" name="bookList[1]"><br>         用户1：<input type="text" name="msg[0].username"><br>        用户2：<input type="text" name="msg[1].username"><br>        密码：<input type="password" name="password"><br>        <input type="submit" value="提交"/>    </form>

LoginAction.java

//package com.struts2.action;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;import com.struts2.po.User;public class LoginAction extends ActionSupport implements ModelDriven<User>{    private User user = new User();;    public String login(){        System.out.println(user.getUsername());        System.out.println(user.getBookList().get(0));        System.out.println(user.getBookList().get(1));        System.out.println(user.getMsg().get(0).getUsername());        System.out.println(user.getMsg().get(1).getUsername());        return SUCCESS;    }    @Override    public User getModel() {        return user;    }}

执行结果：
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十一月 13, 2016 10:17:42 上午 org.apache.catalina.core.StandardContext reload信息: Reloading Context with name [/Struts2_Test] is completed比伯三国演义水浒传小谭小李

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