Struts中Action三种接收参数的方式？

云海谷天

发布于 2022-08-09 13:58:53

3070

发布于 2022-08-09 13:58:53

文章被收录于专栏：技术一点点成长

前言：

前面已经有一篇随笔介绍了Struts2的大概原理。本文就Struts2中Action与jsp页面进行数据对接时介绍几种常见方法！

值栈ValueStack

3个Action Action1

package com.gdufe.action;

import com.opensymphony.xwork2.ActionSupport;

/*
 * Action接收参数之后通过set方法赋给普通变量age，name;
 */
public class UserAction1 extends ActionSupport{
    
    private int age;
    private String name;
    
    
    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String execute(){
        
        return SUCCESS;
    }
    
    public String test(){
        System.out.println(age +"|"+ name);
        return SUCCESS;
    }
}

Action2

package com.gdufe.action;

import com.gdufe.pojo.User;
import com.opensymphony.xwork2.ActionSupport;

/*
 * Action接收参数之后赋给引用对象“user”,内部是set方法赋值
 */
public class UserAction2 extends ActionSupport {
    
    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }
    
    public String test(){
        System.out.println(user.getName() + "|" + user.getAge());
        return "success";
    }
}

Action3

package com.gdufe.action;

import com.gdufe.pojo.User;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction3 extends ActionSupport implements ModelDriven<User> {
    
    private User user = new User();
    
    public String test(){
        
        System.out.println(user.getName() + "|" + user.getAge());
        return "success";
    }

    public User getModel() {
        return user;
    }
}

2个页面

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ 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>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    
  </head>
  
  <body>

　　　 success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ 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>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    
  </head>
  
  <body>

    <h2>Action传值双击debug</h2>
    <s:debug></s:debug>  
    <!-- debug重要的strut2标签调试工具 -->
  </body>
</html>

1个struts.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    
     <!-- devMode设置为开发模式   -->
     <constant name="struts.devMode" value="true" />
     <package name="default" extends="struts-default">
         <!-- 注：因为Action采用DMI方式，故不需要指明method 以及 ‘result’ -->
        <action name="userAction1" class="com.gdufe.action.UserAction1" >
            <result>/success.jsp</result>
        </action>
        
        <action name="userAction2" class="com.gdufe.action.UserAction2" >
            <result>/success.jsp</result>
        </action>
        
        <action name="userAction3" class="com.gdufe.action.UserAction3" >
            <result>/success.jsp</result>
        </action>
        
    </package>

</struts>

　　运行结果：

对应Action1——------------------*-------------------------