struts2-Action笔记-优快云博客

本文链接：https://blog.youkuaiyun.com/hugui123456ccc/article/details/83708151

本文介绍了Struts2框架的基本配置方法，包括默认Action处理、Web元素访问方式、与Struts1的区别、简单的参数验证及配置文件的包含方式。通过实例展示了如何实现登录功能和错误显示。

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[b]1。默认action处理[/b]


<?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.devMode" value="true" />

    <package name="default" namespace="/" extends="struts-default">
         <!--当找不到action则返回默认的action--!>
    	<default-action-ref name="index"></default-action-ref>
    	<action name="index">
    		<result>/default.jsp</result>
    	</action>
    </package>
</struts>

[b]2. 访问Web元素[/b]
a) Map类型
i. IoC
ii. 依赖Struts2
b) 原始类型
i. IoC
ii. 依赖Struts2


import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware {

	private Map<String, Object> request;
	private Map<String, Object> session;
	private Map<String, Object> application;

	//DI dependency injection
	//IoC inverse of control
	public String execute() {
		request.put("r1", "r1");
		session.put("s1", "s1");
		application.put("a1", "a1");
		return SUCCESS; 
	}

	@Override
	public void setRequest(Map<String, Object> request) {
		this.request = request;
	}

	@Override
	public void setSession(Map<String, Object> session) {
		this.session = session;
	}

	@Override
	public void setApplication(Map<String, Object> application) {
		this.application = application;
	}


}

在jsp页面中这样可以取得


<?xml version="1.0" encoding="GB18030" ?>
<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
    <%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />
<title>Insert title here</title>
</head>
<body>
	User Login Success!
	<br />
	<s:property value="#request.r1"/> | <%=request.getAttribute("r1") %> <br />
	<s:property value="#session.s1"/> | <%=session.getAttribute("s1") %> <br />
	<s:property value="#application.a1"/> | <%=application.getAttribute("a1") %> <br />
	<s:property value="#attr.a1"/><br />
	<s:property value="#attr.s1"/><br />
	<s:property value="#attr.r1"/><br />
	<s:debug></s:debug>
	<br />
</body>
</html>

[b]3.struts2和struts1在Action方面的区别：[/b]
struts2中每个客户端访问都会new 一个新的Action
而struts1则是同一个Action，要考虑线程同步问题

[b]4.简单参数验证addFieldError[/b]



import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport {
	private String name;

	public String add() {
		if(name == null || !name.equals("admin")) {
			this.addFieldError("name", "name is error");
			this.addFieldError("name", "name is too long");
			return ERROR;
		} 
		return SUCCESS;
	}

	public String getName() {
		return name;
	}

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


}

在jsp中通过下面的这种方式来取得


<body>
	User Add Error!
	<s:fielderror fieldName="name" theme="simple"/>
	<br />
	<s:property value="errors.name[0]"/>
	<s:debug></s:debug>
</body>

[b]5。包含[/b]


<?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.devMode" value="true" />
    <!-- 将login.xml包含在此处，相当于把login.xml中的配置直接复制到这里 -->
    <include file="login.xml" />
</struts>


<?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>
    <package name="login" extends="struts-default" namespace="/login">
        <action name="login*" class="com.hugui.struts2.user.action.LoginAction{1}">
            <result>/user_login_success.jsp</result>
        </action>
    </package>
</struts>