Web Services应用实例 -- Java Web App远程调用SAS程序的解决方案

最近要做个小项目CoreLabView，让客户能通过浏览器看他的文件（由公司SAS程序产生的一些报表）。
这算是我做的第二个AJAX应用。
其实做个类似于Windows资源管理器的界面是很简单的，在ExtJS的examples基础上改改就好了--我一直是这么做的。当然还要实现的就是访问控制，对这个小项目而言都不值一提。
幕后英雄是SAS程序，它将被我的Java程序调用。至于SAS到底是什么东西，我不太了解，也不需要太了解，我只从公司SAS程序员那里知道，它是用来分析数据的。我只需要知道那个SAS命令的调法就足够了。

问题是，SAS程序部署在SAS Server上，而我要开发的Java Web App将部署在另一台Server上。如果在同一台机器上，用Runtime.getRuntime().exec就可以直接调用SAS程序了。现在这种情况，宜用Web Services来做。

1. 在SAS Server上安装JDK和Tomcat.
2. SASWebServices开发。同样，改改Google来的一个demo就好了（看来Google是软件开发人员的必备工具）
代码不多，多的是配置和依赖的JARs

package com.grs.webview.webservices.sas;

import java.io.IOException;

import javax.jws.WebService;

@WebService 
public interface ISASService {
	public void process() throws IOException;
}

package com.grs.webview.webservices.sas;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import javax.jws.WebService;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

@WebService( 
	serviceName = "SASService", 
	endpointInterface = "com.grs.webview.webservices.sas.ISASService" 
) 
public class SASServiceImpl implements ISASService {

	private static Log log = LogFactory.getLog(SASServiceImpl.class);

	/**
	 * invoke SAS command
	 */
	public void process() throws IOException {
		log.info("invoking SAS program...");

		StringBuffer cmd = new StringBuffer("cmd");

//		String[] cmds = new String[]{"mkdir sam_tmp_0", "cd sam_tmp_0", "mkdir sam_tmp_1", "cd sam_tmp_1", "mkdir sam_tmp_2"};
//		String[] cmds = new String[]{"cd D:\\wwwroot", "d:", "mkdir sam_tmp_1", "cd sam_tmp_1", "mkdir sam_tmp_2"};

		String[] cmds = new String[]{
				new StringBuilder()
					.append("\"C:\\Program Files\\SAS\\SAS 9.1\\SAS.EXE\" ")
					.append("D:\\wwwroot\\TEST.sas ")
					.append("-CONFIG \"C:\\Program Files\\SAS\\SAS 9.1\\nls\\en\\SASV9.CFG\" ") 
					.append("-nosplash ") 
					.append("-nologo ") 
					.append("-noautoexec ") 
					.append("–icon")
					.toString()};

		Process p = Runtime.getRuntime().exec(cmd.toString());

		new OutputStuffThread(p, cmds).start();

		BufferedInputStream buffer = new BufferedInputStream(p.getErrorStream());
		BufferedReader commandResult = new BufferedReader(new InputStreamReader(buffer));
		try {
			for (int count = 0; count < cmds.length + 1;count++) {
				String s = commandResult.readLine();
				log.info("Command output #" + (count + 1) + " : " + s);			
			}
			commandResult.close();
		} catch (java.io.IOException e) {
			e.printStackTrace();
		}

		log.info("SAS program invoked.");

	}

}


/**
 * the class is needed for interactive commands
 * 
 * @author Sam Chen
 * @version 1.0 08/09/2007
 */
class OutputStuffThread extends Thread {
	private Process m_process;
	private String[] m_rest;

	public OutputStuffThread(Process process, String[] rest) {
		m_process = process;
		m_rest = rest;
	}

	public void run() {
		try {
			BufferedOutputStream bufferout = new BufferedOutputStream(m_process.getOutputStream());
			PrintWriter commandInput = new PrintWriter((new OutputStreamWriter(bufferout)), true);
			if (null == m_rest || m_rest.length == 0) {
				commandInput.println("exit");
			} else {
				for (int i = 0; i < m_rest.length; i++) {
					commandInput.println(m_rest[i]);
				}
				if (!"exit".equals(m_rest[m_rest.length - 1])) {
					commandInput.println("exit");
				}
			}
			commandInput.close();
		} catch( Exception e ) {
			System.err.println(e);
		}
	}

}

package test;

import org.codehaus.xfire.service.Service;
import org.codehaus.xfire.client.XFireProxyFactory;
import org.codehaus.xfire.annotations.AnnotationServiceFactory;

import com.grs.webview.webservices.sas.ISASService;
import com.grs.webview.webservices.sas.SASServiceImpl;

import java.io.IOException;
import java.net.MalformedURLException; 

public class TestRunner {

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

		Service serviceModel = new AnnotationServiceFactory().create( SASServiceImpl.class);

//	    String url = "http://localhost:8888/SASWebServices/services/SASService";
		String url = "http://assasii.grs-cro.com:8080/SASWebServices/services/SASService";

	    try { 
			ISASService service = (ISASService)new XFireProxyFactory().create(serviceModel, url); 
			service.process();
		} catch (MalformedURLException e) { 
			e.printStackTrace(); 
		}

	} 
}