Struts 2 Annotations

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Struts2 提供两种形式的配置，一种是传统的struts.xml文件配置方式，另外一种就是Annotations 方式，使用Annotations 方式就不需要在写struts.xml文件，相当于零配置。至于如何使用Annotations 方式，下面我以例子形式讲述：

首先导入下面的Jar文件到你的项目中WebRoot/WEB-INF/lib目录

struts2-convention-plugin-x.y.z.jar
asm-x.y.jar
antlr-x.y.z.jar
commons-fileupload-x.y.z.jar
commons-io-x.y.z.jar
commons-lang-x.y.jar
commons-logging-x.y.z.jar
commons-logging-api-x.y.jar
freemarker-x.y.z.jar
javassist-.xy.z.GA
ognl-x.y.z.jar
struts2-core-x.y.z.jar
xwork-core.x.y.z.jar

下面我们开始一个例子，Employee

创建主页 index.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><title>Employee Form</title></head><body>   <s:form action="empinfo" method="post">      <s:textfield name="name" label="Name" size="20" />      <s:textfield name="age" label="Age" size="20" />      <s:submit name="submit" label="Submit" align="center" />   </s:form></body></html>

创建视图 success.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><title>Success</title></head><body>   Employee Information is captured successfully.</body></html>

创建Action Employee.java

import com.opensymphony.xwork2.ActionSupport;import org.apache.struts2.convention.annotation.Action;import org.apache.struts2.convention.annotation.Result;import org.apache.struts2.convention.annotation.Results;import com.opensymphony.xwork2.validator.annotations.*;@Results({   @Result(name="success", location="/success.jsp"),   @Result(name="input", location="/index.jsp")})public class Employee extends ActionSupport{   private String name;   private int age;   @Action(value="/empinfo")   public String execute()    {       return SUCCESS;   }   @RequiredFieldValidator( message = "The name is required" )   public String getName() {       return name;   }   public void setName(String name) {       this.name = name;   }   @IntRangeFieldValidator(message = "Age must be in between 28 and 65",                                      min = "29", max = "65")   public int getAge() {       return age;   }   public void setAge(int age) {       this.age = age;   }}

配置文件 web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xmlns="http://java.sun.com/xml/ns/javaee"   xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"   id="WebApp_ID" version="3.0">   <display-name>Struts 2</display-name>   <welcome-file-list>      <welcome-file>index.jsp</welcome-file>   </welcome-file-list>   <filter>      <filter-name>struts2</filter-name>      <filter-class>       org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter      </filter-class>      <init-param>         <param-name>struts.devMode</param-name>         <param-value>true</param-value>      </init-param>   </filter>   <filter-mapping>      <filter-name>struts2</filter-name>      <url-pattern>/*</url-pattern>   </filter-mapping></web-app>