Struts2的配置

时间 2019-11-06

标签 struts2 struts 配置栏目 Struts 繁體版

原文原文链接

第一次搭建Sturts框架会遇到几个坑html

1.IntelliJ自动生成的web.xml中filter-class报错，是由于Struts2-2.5版本修改了前端

改成java

2.配置好Tomcat后会报错web

但是我明明已经配正确了啊？修复的地方以下（这是最坑的地方）apache

回到个人Android Studio一看，果真真有同样的tomcat

3.接下来又会报个错，尼玛，错误我就不发了，反正是少了个jar包微信

添加图中的xwork-core-2.1.6.jar而后竟然还得Fix一下，终于好了app

我尼玛一行代码还没写啊，都折腾个半死，IntelliJ该好好检讨一下框架

好了，下面开始讲Struts2的配置jsp

个人Demo工程结构以下

先把公用的代码贴出来

struts.xml（一个工程只有一个）

<?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>
    <include file="com/jinke/struts2/demo1/struts_demo1.xml"/>
    <include file="com/jinke/struts2/demo2/struts_demo2.xml"/>
    <include file="com/jinke/struts2/demo3/struts_demo3.xml"/>
    <include file="com/jinke/struts2/demo4/struts_demo4.xml"/>
    <include file="com/jinke/struts2/demo5/struts_demo5.xml"/>
</struts>

web.xml（welcome-file是tomcat启动后自动弹出的首页，一个工程也只有一个）

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
    <welcome-file-list>
        <welcome-file>demo.jsp</welcome-file>
    </welcome-file-list>
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

第一部分：最基础的

public class HelloAction { public String execute() { System.out.println("helloaaction执行了"); return "success"; } }

struts_demo1.xml

<?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>
    <package name="hello" extends="struts-default" namespace="/">
        <action name="hello" class="com.jinke.struts2.demo1.HelloAction">
            <!--配置页面的跳转-->
            <result name="success">success.jsp</result>
        </action>
    </package>
</struts>

index.jsp

<%-- Created by IntelliJ IDEA. User: wanglei Date: 2019/6/15 Time: 11:13 To change this template use File | Settings | File Templates. --%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Struts入门</title>
</head>
<body>
<h1>Struts2入门</h1>
<h3><a href="${ pageContext.request.contextPath }/hello.action">Struts2的入门</a></h3>
</body>
</html>

success.jsp

<%-- Created by IntelliJ IDEA. User: wanglei Date: 2019/6/15 Time: 12:05 To change this template use File | Settings | File Templates. --%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>成功</title>
</head>
<body>
<h1>跳转页面成功！</h1>
</body>
</html>

结果

第二部分：实现Action的三种方式

public class ActionDemo2 { public String execute() { System.out.println("ActionDemo2执行了"); return null; } }

import com.opensymphony.xwork2.Action; /** * action实现方法2：实现接口 */
public class ActionDemo3 implements Action { @Override public String execute() throws Exception { System.out.println("ActionDemo3执行了"); return null; } }

import com.opensymphony.xwork2.ActionSupport; /** * action实现方式3：继承actionSupport */
public class ActionDemo4 extends ActionSupport { @Override public String execute() throws Exception { System.out.println("actiondemo4执行了"); return NONE; } }

struts_demo2.xml

<?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>
    <package name="demo2" extends="struts-default" namespace="/">
        <action name="actionDemo2" class="com.jinke.struts2.demo2.ActionDemo2"/>
    </package>
</struts>

struts_demo3.xml

<?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>
    <package name="demo3" extends="struts-default" namespace="/">
        <action name="actionDemo3" class="com.jinke.struts2.demo3.ActionDemo3"/>
    </package>
</struts>

struts_demo4.xml

<?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>
    <package name="demo4" extends="struts-default" namespace="/">
        <action name="actionDemo4" class="com.jinke.struts2.demo4.ActionDemo4"/>
    </package>
</struts>

第三部分：实现方法的三种方式

import com.opensymphony.xwork2.ActionSupport; public class CustomerAction extends ActionSupport { public String find() { System.out.println("查询客户"); return NONE; } public String update() { System.out.println("修改客户"); return NONE; } public String delete() { System.out.println("删除客户"); return NONE; } public String save() { System.out.println("保存客户"); return NONE; } }

import com.opensymphony.xwork2.ActionSupport; public class ProductAction extends ActionSupport { public String find() { System.out.println("查询商品..."); return NONE; } public String update() { System.out.println("修改商品..."); return NONE; } public String delete() { System.out.println("删除商品..."); return NONE; } public String save() { System.out.println("保存商品..."); return NONE; } }

import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport { public String find() { System.out.println("查询用户..."); return NONE; } public String update() { System.out.println("修改用户..."); return NONE; } public String delete() { System.out.println("删除用户..."); return NONE; } public String save() { System.out.println("保存用户..."); return NONE; } }

struts_demo5.xml

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

    <package name="demo5" extends="struts-default" namespace="/">
        <action name="userFind" class="com.jinke.struts2.demo5.UserAction" method="find"></action>
        <action name="userUpdate" class="com.jinke.struts2.demo5.UserAction" method="update"></action>
        <action name="userDelete" class="com.jinke.struts2.demo5.UserAction" method="delete"></action>
        <action name="userSave" class="com.jinke.struts2.demo5.UserAction" method="save"></action>

        <!--通配符方式-->
        <action name="product_*" class="com.jinke.struts2.demo5.ProductAction" method="{1}">
            <allowed-methods>find,update,delete,save</allowed-methods>
        </action>

        <!--动态方法访问的方式-->
        <action name="customer" class="com.jinke.struts2.demo5.CustomerAction">
            <allowed-methods>find,update,delete,save</allowed-methods>
        </action>

    </package>
</struts>

这里有个坑：struts2在2.5以后须要在Struts.xml中增长可用的方法

<allowed-methods>find,update,delete,save</allowed-methods>

结果

Struts2执行流程
先过滤器（前端控制器）--> 执行拦截器 --> 找到struts2.xml配置文件 --> 找到Action的类 --> 反射执行里面的方法 --> 判断返回值，进行页面跳转

Struts2配置文件加载顺序
init_DefaultProperties 加载default.properties
init_TraditionalXmlConfigurations 加载struts-defalut.xml、struts-plugin.xml、struts.xml
init_LegacyStrutsProperties 加载struts.properties
init_CustomConfigurationProviders 加载配置提供类
init_FilterInitParameters 加载web.xml中过滤器初始化参数
init_AliasStandardObjects 加载Bean对象

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