JavaWeb_(SSH)Struts创建Action的三种方式

　　前导博文

　　　　JavaWeb_(SSH)使用Struts框架实现用户的登陆　　传送门

　　

　　第一种DefaultAction什么都没有干

　　第二种实现了Action接口

　　第三种继承了ActionSupport类【常用】

　　目录结构

　　

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package com.Gary.web;

public class DefaultAction {

    public String execute()
    {
        System.err.println("这是一个普通的action");
        return null;
    }
    
}

DefaultAction.java

package com.Gary.web;

import com.opensymphony.xwork2.Action;

class ImplAction implements Action{

    @Override
    public String execute() throws Exception {
        System.out.println("这是实现了Action接口的action");
        return null;
    }

}

ImplAction.java

package com.Gary.web;

import org.apache.struts2.ServletActionContext;

import com.Gary.domain.User;
import com.Gary.service.UserService;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction extends ActionSupport implements ModelDriven<User>{

    public User user = new User();
    
    public String execute() throws Exception {
        
        System.err.println("我已经运行了");
        
        UserService userService = new UserService();
        boolean success = userService.findUser(user);
        if(success)
        {
            return "success";
        }else{
            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");
            return "error";
        }
        
    }

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

UserAction.java

　　配置struts.xml

<struts>
    <!-- name:配置包名 -->
    <package name="MyPackage" namespace="/" extends="struts-default">
        <action name="LoginAction" class="com.Gary.web.UserAction" method="execute">
            <!-- 默认为转发  redirect设置为重定向-->
            <result name="success" type="redirect">/index.html</result>
            <result name="error">/login.jsp</result>
        </action>
        
        <action name="LoginActionDefault" class="com.Gary.web.DefaultAction" method="execute">
        </action>
        
        <action name="LoginActionImpl" class="com.Gary.web.ImplAction" method="execute"></action>
    </package>
</struts>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd">
    
    
<struts>
    <!-- name:配置包名 -->
    <package name="MyPackage" namespace="/" extends="struts-default">
        <action name="LoginAction" class="com.Gary.web.UserAction" method="execute">
            <!-- 默认为转发  redirect设置为重定向-->
            <result name="success" type="redirect">/index.html</result>
            <result name="error">/login.jsp</result>
        </action>
        
        <action name="LoginActionDefault" class="com.Gary.web.DefaultAction" method="execute">
        </action>
        
        <action name="LoginActionImpl" class="com.Gary.web.ImplAction" method="execute"></action>
    </package>
</struts>

struts.xml