Struts2的配置

第一次搭建Sturts框架会遇到几个坑

1.IntelliJ自动生成的web.xml中filter-class报错,是因为Struts2-2.5版本修改了

改为

2.配置好Tomcat后会报错

可是我明明已经配正确了啊?修复的地方如下(这是最坑的地方)

回到我的Android Studio一看,果然真有一样的

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

添加图中的xwork-core-2.1.6.jar然后居然还得Fix一下,终于好了

我尼玛一行代码还没写啊,都折腾个半死,IntelliJ该好好反省一下

好了,下面开始讲Struts2的配置

我的Demo工程结构如下

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之后需要在Struts.xml中增加可用的方法

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

结果

本文分享自微信公众号 - 安卓圈(gh_df75572d44e4)

原文出处及转载信息见文内详细说明,如有侵权,请联系 yunjia_community@tencent.com 删除。

原始发表时间:2019-06-17

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