Struts2学习四----------动态方法调用

2021-12-30 16:23:22

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Struts2动态方法调用

　　- 默认：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

<package name="default" extends="struts-default" namespace="/">

		<action name="add" class="org.struts.dynamicmethod.action.DynamicMethod">

			<result>/add.jsp</result>					<!-- 若没有execute方法，默认执行该result -->

			<result name="error">/error.jsp</result>

		</action>

	</package>

　　- 指定method属性：执行method属性中定义的方法，没有该方法，页面报错

<package name="default" extends="struts-default" namespace="/">

		<action name="add" method="add" class="org.struts.dynamicmethod.action.DynamicMethod">

			<result>/add.jsp</result>

			<result name="error">/error.jsp</result>

		</action>

	</package>

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

　　　　　　　　　　若配置method，执行method属性中定义的方法，没有该方法，则报错

<package name="default" extends="struts-default" namespace="/">

		<action name="add_*" method="{1}" class="org.struts.dynamicmethod.action.DynamicMethod">

			<result>/{1}.jsp</result>					<!-- 若未配置method属性，并且没有execute方法，默认执行该result -->

			<result name="error">/error.jsp</result>

		</action>

	</package>

　　- 感叹号方法：在!（感叹号）后面指定方法名，需在package中设置strict-method-invocation="false"，并且开启动态方法调用（老版本只需开启动态方法调用即可）

<package name="default" extends="struts-default" namespace="/" strict-method-invocation="false">

		<action name="add" class="org.struts.dynamicmethod.action.DynamicMethod">

			<result>/add.jsp</result>

			<result name="error">/error.jsp</result>

		</action>

	</package>

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

实例

1.项目结构

Struts2学习四----------动态方法调用

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>org.struts</groupId>

	<artifactId>Struts2-DynamicMethod</artifactId>

	<packaging>war</packaging>

	<version>0.0.1-SNAPSHOT</version>

	<name>Struts2-DynamicMethod Maven Webapp</name>

	<url>http://maven.apache.org</url>

	<properties>

		<!-- 统一Struts2的版本 -->

		<struts.version>2.5.10</struts.version>

		<!-- 统一源代码与编译的编码格式 -->

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

	</properties>

	<dependencies>

		<!-- junit -->

		<dependency>

			<groupId>junit</groupId>

			<artifactId>junit</artifactId>

			<version>4.12</version>

			<scope>test</scope>

		</dependency>

		<!-- Struts2 -->

		<dependency>

		    <groupId>org.apache.struts</groupId>

		    <artifactId>struts2-core</artifactId>

		    <version>${struts.version}</version>

		</dependency>

	</dependencies>

	<build>

		<finalName>Struts2-DynamicMethod</finalName>

	</build>

</project>

3.web.xml

<?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">

	<filter>

		<filter-name>struts</filter-name>

		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>

	</filter>

	<filter-mapping>

		<filter-name>struts</filter-name>

		<url-pattern>/*</url-pattern>

	</filter-mapping>

</web-app>

4.DynamicMethod.java

package org.struts.dynamicmethod.action;

import com.opensymphony.xwork2.ActionSupport;

public class DynamicMethod extends ActionSupport {

	private static final long serialVersionUID = 1L;

	public String add() {

		return "add";

	}

	public String modify() {

		return "modify";

	}

	public String delete() {

		return "delete";

	}

}

5.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="org.struts.dynamicmethod.action.DynamicMethod">

			<result>/search.jsp</result>

			<result name="error">/error.jsp</result>

		</action>

		<!-- 指定method属性 -->

		<action name="add" method="add" class="org.struts.dynamicmethod.action.DynamicMethod">

			<result name="add">/add.jsp</result>

			<result name="error">/error.jsp</result>

		</action>

		<!-- 感叹号方式 -->

		<action name="modify" class="org.struts.dynamicmethod.action.DynamicMethod">

			<result name="modify">/modify.jsp</result>

			<result name="error">/error.jsp</result>

		</action>

		<!-- 通配符方式 -->

		<action name="delete_*" method="{1}" class="org.struts.dynamicmethod.action.DynamicMethod">

			<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.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>

</head>

<body>

	<a href="search">查询</a><br/>

	<a href="add">新增</a><br/>

	<a href="modify!modify">修改</a><br/>

	<a href="delete_delete">删除</a>

</body>

</html>

7.delete.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>Insert title here</title>

</head>

<body>

	This is delete.jsp

</body>

</html>

8.add.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>Insert title here</title>

</head>

<body>

	This is add.jsp

</body>

</html>

9.modify.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>Insert title here</title>

</head>

<body>

	This is modify.jsp

</body>

</html>

10.search.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>Insert title here</title>

</head>

<body>

	This is search.jsp

</body>

</html>

11.效果预览

　　11.1 主界面

　　Struts2学习四----------动态方法调用

　　11.2 查询（默认方式，类中无execute方法，默认返回name="success"的result对应的界面）

　　Struts2学习四----------动态方法调用

　　11.3 新增（指定method属性，执行add方法）

　　Struts2学习四----------动态方法调用

　　11.4 修改（感叹号方式，执行modify方法）

　　Struts2学习四----------动态方法调用

　　11.5 删除（通配符方式，执行delete方法）

　　Struts2学习四----------动态方法调用

参考：http://www.imooc.com/video/8999

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