关于struts2.5 动态方法调用（DMI）出现错误的解决办法

最新推荐文章于 2021-11-19 16:48:54 发布

最新推荐文章于 2021-11-19 16:48:54 发布 · 799 阅读

Java 同时被 3 个专栏收录

4 篇文章

订阅专栏

struts2.5

3 篇文章

订阅专栏

DMI

1 篇文章

订阅专栏

本文介绍了一个关于Struts2动态方法调用的问题及其解决方案，详细展示了如何通过配置struts.xml文件来启用动态方法调用，并指出访问路径大小写的重要性。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1. 先上代码

代码结构图如下

2. 展示代码

WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>Struts2Test</display-name>
  <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>
  <welcome-file-list>   
    <welcome-file>/index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

src/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>
    <!-- 设置开发模式,每次修改代码保存后会重新加载国际化资源文件和配置文件 -->
	<constant name="struts.devMode" value="true"></constant>
	<package name="HelloWorldPkg" namespace="/" extends="struts-default">
		<action name="HelloWorldAction_*" class="com.demo.struts2.action.HelloWorld" method="{1}">
			<result name="success">/index.jsp</result>
			<result name="add">/add.jsp</result>
			<result name="save">/index.jsp</result>
			<result name="update">/add.jsp</result>
			<result name="edit">/add.jsp</result>
		</action>
	</package>
</struts>

src/com/demo/struts2/action/HelloWorld.java

package com.demo.struts2.action;

import java.io.IOException;

import org.apache.struts2.ServletActionContext;

public class HelloWorld {
	private String name;
	private String age;
	
	public String getName() {
		return name;
	}


	public void setName(String name) {
		this.name = name;
	}


	public String getAge() {
		return age;
	}


	public void setAge(String age) {
		this.age = age;
	}
	
	public String execute() {
		System.out.println("execute");
		return "success";
	}
	
	public String add() {
		System.out.println("add");
		return "add";
	}
	
	public String save() {
		System.out.println("save");
		try {
			ServletActionContext.getResponse().getWriter().println("Save successful");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	
	public String edit() {
		System.out.println("edit");
		return "edit";
	}
	
	public String update() {
		System.out.println("update");
		try {
			ServletActionContext.getResponse().getWriter().println("Update successful");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
}

/WebContent/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">
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<s:form action="HelloworldAction_save" namespace="/" method="post">
		<s:textfield label="name" name="name"></s:textfield>
		<s:textfield label="age" name="age"></s:textfield>
		<s:submit value="提交"></s:submit>
	</s:form>
</body>
</html>

2. 当我访问 http://localhost:9090/Struts2Test/HelloWorldAction_add.action（我的端口是9090，我自己设置的）时，出现如下图的错误

Struts Problem Report

Struts has detected an unhandled exception:

Messages:

There is no Action mapped for namespace [/] and action name [helloWorldAction_add] associated with context path [/Struts2Test].

查看 Referenced Libraries下的struts2-core-2.5.16.jar 包下的 org.apache.struts2.default.properties文件发现struts2.5 默认是关闭动态方法调用的，于是就在struts.xml中设置这个常量为true，具体看图（注意图中红色框的部分）