第三篇——Struts2的动态方法调用

最新推荐文章于 2020-11-09 16:29:09 发布

Remember_Ray

最新推荐文章于 2020-11-09 16:29:09 发布

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本文链接：https://blog.youkuaiyun.com/q343509740/article/details/79700918

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本文介绍Struts2框架中的动态方法调用机制，包括默认执行方式、method属性指定方法、感叹号与通配符方式，并通过实例展示不同调用方式的效果。

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Struts2动态方法调用

默认方式：默认执行方法中的execute方法，若指定类中没有该方法，默认返回success；

method方式：执行method属性中定义的方法，没有该方法，页面报错；

通配符方式：使用 * 作为通配符，若没有配置method，默认执行execute，若没有execute方法，默认返回success；

感叹号方法：在！后面指定方法名，需要在package中设置strict-method-invocation="false" ，并且开启动态方法调用<constant name="struts.enable.DynamicMethodInvocation" value="true"/>

项目实例：

1、项目结构

2、pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ray</groupId>
  <artifactId>struts2Test</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>struts2Test Maven Webapp</name>
  <url>http://maven.apache.org</url>

  <dependencies>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-core -->
    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-core</artifactId>
      <version>2.5.16</version>
    </dependency>


  </dependencies>

  <build>
    <finalName>struts2Test</finalName>
  </build>

</project>

3、web.xml

<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" metadata-complete="true">
  <display-name>Archetype Created Web Application</display-name>

  <!-- 过滤所有请求交给Struts2处理 -->
  <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>

4、DynamicMethod.java

package com.ray.action;

import com.opensymphony.xwork2.ActionSupport;

/**
 * Created by Ray on 2018/3/26 0026.
 **/
public class DynamicMethod extends ActionSupport {

    public String add(){
        return "add";
    }

    public String modify(){
        return "modify";
    }

    public String delete(){
        return "delete";
    }
}

5、third-struts.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>

    <!-- 只有感叹号动态调用方法时需要设置strict-method-invocation="false" -->
    <package name="dynamic" extends="struts-default" namespace="/" strict-method-invocation="false">

        <!-- 默认，无execute方法，执行name="success"的result -->
        <action name="search" class="com.ray.action.DynamicMethod">
            <result>/search.jsp</result>
            <result name="error">/error.jsp</result>
        </action>

        <!-- 指定method属性 -->
        <action name="add" class="com.ray.action.DynamicMethod" method="add">
            <result name="add">/add.jsp</result>
            <result name="error">/error.jsp</result>
        </action>

        <!-- 感叹号方式 -->
        <action name="modify" class="com.ray.action.DynamicMethod">
            <result name="modify">/modify.jsp</result>
            <result name="error">/error.jsp</result>
        </action>

        <!-- 通配符方式 -->
        <action name="delete_*" class="com.ray.action.DynamicMethod" method="{1}">
            <result name="delete">/{1}.jsp</result>
            <result name="error">/error.jsp</result>
        </action>

    </package>

    <!-- 开启动态方法调用，只有使用感叹号动态调用方法时需要开启 -->
    <constant name="struts.enable.DynamicMethodInvocation" value="true"/>
</struts>

6、struts.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="default" namespace="/" extends="struts-default">

        <action name="helloWorld" class="com.ray.action.HelloWorldAction">
            <result name="success">/success.jsp</result>
        </action>
    </package>
    
    <include file="second-struts.xml"/>
    <include file="third-struts.xml"/>
</struts>

7、index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!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>动态方法调用测试</title>
<body>
    <a href="search">查询</a>
    <a href="add">新增</a>
    <a href="modify!modify">修改</a>
    <a href="delete_delete">删除</a>
</body>
</html>

8、delete.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is delete.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is delete.jsp
</body>
</html>

9、add.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is add.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is add.jsp
</body>
</html>

10、modify.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is modify.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is modify.jsp
</body>
</html>

11、search.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is search.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is search.jsp
</body>
</html>

12、error.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is error.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is error.jsp
</body>
</html>

13、页面效果

13.1 主界面