Structs接收参数的三种方式Model，ModelDriver

最新推荐文章于 2019-09-20 01:38:13 发布

伍Wu哈Ha

最新推荐文章于 2019-09-20 01:38:13 发布

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分类专栏：架构文章标签： struts2.0

本文链接：https://blog.youkuaiyun.com/Peng_Hong_fu/article/details/53159547

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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.
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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
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