关于Xwork的配置对象和XWork第一个程序

XWork2中的配置主要是有以下几个类完成：

ConfigurationManager

Configuration

ConfigurationProvider

其中：Configuration和ConfigurationProvider是两个接口。

ConfigurationManager：

是XWork2配置的核心， 它支持ConfigurationProvider的动态加入，进而可以生成自设定的Configuration。通常情况下，实例化一个ConfigurationManager来完成XWork2的应用。

ConfigurationProvider:

ConfigurationProvider的作用是对配置Configuration对象进行支持、帮助，将该 Configuration对象拥有那些Action、Result对象是如何和Action映射、使用了那些Interceptors以及它们和 Action的映射关系等信息提供给Configuration对象。XWork2的默认的ConfigurationProvider是 XmlConfigurationProvider, 该Provider通过参数中指定的XML文件包含的信息来配置Configuration对象。

Configuration:

Configuration 是一个典型的值对象， 它包含了配置的信息， 对于每个ConfigurationManager,仅对应于一个Configuration接口的实例， 它被传递个每一个Provider，每个Provider将自己存储的配置信息赋给Configuration对象。

    ConfigurationManager confManager = new ConfigurationManager();

    confManager.setConfiguration(new MyCustomConfiguration(...));

第一个XWork程序

XWork的配置文件xwork-hello-world.xml：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE xwork PUBLIC

"-//OpenSymphony Group//XWork 1.1.1//EN"

"http://www.opensymphony.com/xwork/xwork-1.1.1.dtd">

<xwork>

<include file="xwork-default.xml" />

<package name="default-hello-world" extends="xwork-default" namespace="/helloWorld">

  <result-types>

   <result-type name="printToConsole" class="example.helloworld.PrintToConsoleResult" />

  </result-types>

  <action name="helloWorld" class="example.helloworld.HelloWorldAction">

   <result type="printToConsole">

    <param name="param">${message}</param>

   </result>

  </action>

</package>

</xwork>

启动程序：

package example.helloworld;

package example.helloworld;

import java.util.LinkedHashMap;

import com.opensymphony.xwork2.ActionProxy;

import com.opensymphony.xwork2.ActionProxyFactory;

import com.opensymphony.xwork2.config.Configuration;

import com.opensymphony.xwork2.config.ConfigurationManager;

import com.opensymphony.xwork2.config.providers.XWorkConfigurationProvider;

import com.opensymphony.xwork2.config.providers.XmlConfigurationProvider;

/**

* @author Jackie

*

*/

public class HelloWorldTutorial {

public static void main(String[] args) throws Exception {

   ConfigurationManager confManager = new ConfigurationManager();

//将自己定义xwork配置加入到Configuration Manager

   confManager.addContainerProvider(

     new XmlConfigurationProvider(

       "example/helloworld/xwork-hello-world.xml",

      true));

   //将xwork的默认xml配置加入到Configuration Provider

   confManager.addContainerProvider(new XWorkConfigurationProvider());

   //得到Configuration对象

   Configuration conf = confManager.getConfiguration();

   ActionProxyFactory actionProxyFactory = conf.getContainer().getInstance(ActionProxyFactory.class);

   ActionProxy actionProxy = actionProxyFactory.createActionProxy(

     "/helloWorld", "helloWorld", null, new LinkedHashMap());

   actionProxy.execute();

}

}

HelloWorldAction.java

package example.helloworld;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import com.opensymphony.xwork2.ActionSupport;

/**

* @author Jackie

*

*/

public class HelloWorldAction extends ActionSupport{

private static final long serialVersionUID = 6874543345469426109L;

private static final Log _log = LogFactory.getLog(HelloWorldAction.class);

private String message ;

public String getMessage() {

  return message;

}

public void setMessage(String message) {

  this.message = message;

}

public String execute() {

  _log.debug("execute...");

  message = "Hello World";

  return SUCCESS;

}

}

HelloWorldAction对应的Result：

package example.helloworld;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.Result;

import com.opensymphony.xwork2.util.TextParseUtil;

/**

* @author Jackie

*

*/

public class PrintToConsoleResult implements Result{

private static final Log _log = LogFactory.getLog(PrintToConsoleResult.class);

private static final long serialVersionUID = -6173326554804520601L;

  private String param = "whatsoever";

  public void setParam(String param) { this.param = param; }

  public String getParam() { return this.param; }

@Override

public void execute(ActionInvocation invocation) throws Exception {

  _log.debug("execute...");

  String result = TextParseUtil.translateVariables(param, invocation.getStack());

  System.out.println(result);

}

}

参考：

Xwork的doc文档 http://wiki.opensymphony.com/display/XW/XWork2+Hello+World+Tutoria