java为避免struts,自定义拦截器类和包应该使用什么命名约定。Struts2中的xml
我想知道struts2中是否有命名自定义拦截器的约定,用于自动检测拦截器,就像操作类一样
我正在使用“struts2-convention-plugin-2.3.24.1.jar”
包结构如下
ProtienTracker
>Java Resources
>src
>com.nagarro.actions
>HelloAction.java
>com.nagarro.interceptors
>custInterceptor.java
>WebContent
>META_INF
>WEB_INF
>content
>hello.jsp
>lib
>web.xml
代码在没有“struts.xml”和“custInterceptor”的情况下运行完美。struts2约定插件会自动检测到该操作
只要我把拦截器装上
@org.apache.struts2.convention.annotation.Action(value="hello",
interceptorRefs=@InterceptorRef("custInterceptor"))
我得到的错误如下所示
文件如下
你好。jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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=ISO-8859-1">
<title>Hello</title>
</head>
<body>
<h1><s:property value="greeting"/></h1>
<p>hi</p>
</body>
</html>
你好。爪哇
package com.nagarro.actions;
import com.opensymphony.xwork2.Action;
import org.apache.struts2.convention.annotation.InterceptorRef;
import org.apache.struts2.convention.annotation.Result;
public class HelloAction implements Action {
private String greeting="ab";
@Override
@org.apache.struts2.convention.annotation.Action(value="hello",
interceptorRefs=@InterceptorRef("custInterceptor"))
public String execute() throws Exception {
setGreeting("Hello Structs 2");
return "success";
}
public String getGreeting() {
return greeting;
}
public void setGreeting(String greeting) {
this.greeting = greeting;
}
}
拦截者。爪哇
package com.nagarro.interceptors;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class custInterceptor implements Interceptor{
private static final long serialVersionUID = 1L;
@Override
public void destroy() {
System.out.println("custInterceptor destroy() is called...");
}
@Override
public void init() {
System.out.println("custInterceptor init() is called...");
}
@Override
public String intercept(ActionInvocation invocation) throws Exception {
System.out.println("custInterceptor intercept() is called...");
System.out.println(invocation.getAction().getClass().getName());
return invocation.invoke();
}
}
我得到以下错误:
Caused by: Unable to find interceptor class referenced by ref-name custInterceptor - [unknown location]
at com.opensymphony.xwork2.config.providers.InterceptorBuilder.constructInterceptorReference(InterceptorBuilder.java:63)
at org.apache.struts2.convention.DefaultInterceptorMapBuilder.buildInterceptorList(DefaultInterceptorMapBuilder.java:95)
at org.apache.struts2.convention.DefaultInterceptorMapBuilder.build(DefaultInterceptorMapBuilder.java:86)
at org.apache.struts2.convention.DefaultInterceptorMapBuilder.build(DefaultInterceptorMapBuilder.java:70)
at org.apache.struts2.convention.PackageBasedActionConfigBuilder.createActionConfig(PackageBasedActionConfigBuilder.java:947)
at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildConfiguration(PackageBasedActionConfigBuilder.java:734)
at org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:355)
at org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:53)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:274)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
... 17 more
# 1 楼答案
如define interceptors with struts2 annotations所述
要在xml中定义一个新的拦截器,需要在struts中定义它。xml文件
您可以看到默认的struts。xml https://struts.apache.org/docs/struts-defaultxml.html是如何定义和使用拦截器的好例子