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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
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
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）
11.3 新增（指定method属性，执行add方法）
11.4 修改（感叹号方式，执行modify方法）
11.5 删除（通配符方式，执行delete方法）
