在idea中用maven搭建struts2项目(基础)

1　　新建maven项目,ctrl+shift+alt+s调出 project Structure设置菜单,点击modules->添加web项目

　　设置path路径,将web改为src\main\webapp目录

　　path relative to deployment root的设置同上

2　　倒入struts2的核心依赖

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.5.10.1</version>
</dependency>


3　　引入其他插件,并<packaging>war包,才可以在tomcat运行
　　

<build>
    <plugins>
        <!-- java编译插件 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.2</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>

        <!-- 配置Tomcat插件 -->
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <port>8080</port>
                <path>/</path>
                <!--这是get请求的乱码处理-->
                <uriEncoding>utf-8</uriEncoding>
            </configuration>
        </plugin>

    </plugins>

</build>
还有dom4j的依赖

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.4.1</version>
</dependency>


4　　　web.xml的配置如下
　　

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
           version="3.0">
    <display-name>Archetype Created Web Application</display-name>
    <!--引入核心过滤器-->
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
        <init-param>
                   <param-name>config</param-name>
                   <param-value>struts-default.xml,struts-plugin.xml,struts.xml</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

5　　struts.xml的配置如下,在resource目录下

<?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="default" extends="struts-default" namespace="/">
        <action name="login" class="cn.itcast.action.DemoAction" method="success">
            <result name="success">success.jsp</result>
        </action>
    </package>
</struts>

 6　　　建立action实现类

package cn.itcast.action;

public class DemoAction {
    public String success(){
       
        System.out.println("成功");
        return "success";
    }

}

7　　在webappa下创建index和success.jsp即可

8　　启动tomcat,访问locahost:8080/login即可

第一次搭建,出现很多bug,大致总结如下:

1　　Unable to process Jar entry [module-info.class] from Jar [jar:file:/D:/Program%20Files/maven/apache-maven-3.5.2/repository/org/apache/logging/log4j/log4j-api/2.10.0/log4j-api-2.10.0.jar!/] for annotations
　　解决办法:按报错的路径找到包,删除,重新导入maven依赖

2　　提示缺少dom4j2-core包,将dom4j的依赖导入

3　　classNotFound异常
　　　　看一下struts2的版本,在2.5之前是org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter,之后需要把ng去掉
4　　No mapping found for dependency [type=com.opensymphony.xwork2.ObjectFactory, name='default'] in publc
　　这个异常是web.xml配置出错

<init-param>
           <param-name>config</param-name>
           <param-value>struts-default.xml,struts-plugin.xml,struts.xml</param-value>
</init-param>
上面的struts-default.xml,struts-plugin.xml,struts.xml都要加上,不能少