Struts2学习笔记 - Action篇<定义逻辑Action>

时间：2023-01-05 08:21:17

有三种方法可以使一个Action处理多个请求

  1. 动态方法调用DMI
  2. 定义逻辑Acton
  3. 在配置文件中使用通配符

这文章就谈论一下定义逻辑Action

这里主要关注的是struts.xml配置文件，一般情况下，我们会这样编写一个Action,当请求的名字为login的时候，就会调用LoginAction的类里面的execute方法

<action name="login" class="struts2.action.LoginAction">

     <result name="success">/success.jsp</result>

     <result name="input">/login2.jsp</result>

</action>

在这里我们只需要多个一个method的属性就能实现处理多请求，如下图，这样我们就可以在实现类DMIAction中分别请求两个不同的方法login和register实现不同的逻辑

<action name="D_Login" class="struts2.action.DMIAction" method="login">

     <result name="success">RegisterSuccess.jsp</result>

</action>

<action name="D_Register" class="struts2.action.DMIAction" method="register">

    <result name="success">RegisterSuccess.jsp</result>

</action>

下面是完整例子

1.两个页面分别请求两个不同的请求，D_Login和D_Register

//DMI_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>

    <h4>请输入</h4>

    <s:form action="D_Login">

        <s:textfield name="username" label="User Name" />

        <s:password name="password" label="Password" />

        <s:submit value="Login" />

    </s:form>

</body>

</html>
//DMI_register.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>

    <h4>注册</h4>

    <s:form action="D_Register">

        <s:textfield name="username" label="User Name" />

        <s:password name="password" label="Password" />

        <s:submit value="Register" />

    </s:form>

</body>

</html>

2.struts.xml配置

<?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>

    <constant name="struts.enable.DynamicMethodInvocation" value="true"/>

    <package name="default" extends="struts-default">

        <action name="D_Login" class="struts2.action.DMIAction" method="login">

            <result name="success">RegisterSuccess.jsp</result>

        </action>

        <action name="D_Register" class="struts2.action.DMIAction" method="register">

            <result name="success">RegisterSuccess.jsp</result>

        </action>

    </package>

</struts>

3.Action类

package struts2.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionSupport;

public class DMIAction extends ActionSupport {

    /**

     *

     */

    private static final long serialVersionUID = 1L;

    public String login() {

        return SUCCESS;

    }

    public String register() {

        return SUCCESS;

    }

    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;

    }

    private Map sessionMap;

    private Map applicationMap;

    public void setSession(Map sessionMap) {

        this.sessionMap = sessionMap;

    }

    public void setApplication(Map applicationMap) {

        this.applicationMap = applicationMap;

    }

}

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