urlfilewriter.java

著名IT公司ILog的APS高级排产优化引擎

package com.power.util.urltools;
import java.util.*;
import java.io.*;
import java.net.*;

import com.power.pipe.*;

import com.power.util.Message.*;

public class URLFileWriter
{
   private static final URLFileWriter INSTANCE =
                              new URLFileWriter();

   // Private constructor supresses
   // default public constructor
    private URLFileWriter( ) {
    }

    public static URLFileWriter getInstance( ) {
        return INSTANCE;
    }

    private PrintStream writer;
	private URL url = null;
    private String urlAddr;
    private HttpURLConnection urlconn = null;
	private	OutputStream out = null;


    /**
     * Initializes a FileWriter for the report using global input directory and
     * local file name.
     */
	private void initURLWriter( String addr ) {
        urlAddr = addr;
		try {
			url = new URL(urlAddr);

		} catch(MalformedURLException e) {
			MessageArea.getInstance().addMessage( "URL_Error " + e.getMessage() );
            return;
		}


		try {
			urlconn = (HttpURLConnection)(url.openConnection());
			urlconn.setRequestMethod("POST");
			urlconn.setDoOutput(true);
			urlconn.setDoInput(true);
			out = urlconn.getOutputStream();
			writer = new PrintStream(out);
		}
		catch(IOException e) {
			MessageArea.getInstance().addMessage( "Error Writing File through URL:" + e.getMessage() + "\n" );
            MessageArea.getInstance().addMessage( "URL address: " + urlAddr );
		}
	}

	public void write( String urlAddr,
                       String fileName,
                       String cmd,
                       String content ) {
        initURLWriter( urlAddr +"?FileName=" + fileName +"&cmd=" + cmd );

		try {
            writer.print( content );
            writer.flush();
            //writer.close();
		} catch( Exception e ) {
             MessageArea.getInstance().addMessage( "URL FileWriter Error 1:" + e.getMessage() + "\n" );
		}

        try{
 			BufferedReader d = null;
             BufferedInputStream in = null;
             in = new BufferedInputStream(urlconn.getInputStream());
             d = new BufferedReader(new InputStreamReader(in));
             String status = d.readLine();
             String errMsg = "**Error";
             if( status !=null && status.length() >= errMsg.length() &&
                 status.substring(0, errMsg.length() ).equals( errMsg ) ) {
                 MessageArea.getInstance().addMessage(
                         "Error writing file through URL: " + status + "\n" );
             }
             disconnectURL();
		}
		catch(Exception e) {
			 MessageArea.getInstance().addMessage( "URL FileWriter Error 2:" + e.getMessage() + "\n");
		}
    }

    private void disconnectURL() {
        if( null == urlconn ) return;

        try{
            if( null != writer ) {
                writer.close();
            }
            if( null != urlconn ) {
                urlconn.disconnect();
            }
        } catch( Exception e ) {
            MessageArea.getInstance().addMessage( "Error disconnect URL: " + urlAddr + "\n" );
            MessageArea.getInstance().addMessage( "Error message: " + e.getMessage() + "\n" );
        }
    }

    public void deleteFile( String urlAddr,
                            String fileName,
                            String cmd ) {
        initURLWriter( urlAddr );

		try {
            writer.print("FileName=" + fileName );
            writer.print("&cmd=" + cmd );
            writer.print( "&content=" + "" );
            writer.flush();
            writer.close();
		} catch( Exception e ) {
             MessageArea.getInstance().addMessage( "URL FileWriter Error 1:" + e.getMessage() + "\n" );
		}

        try{
 			BufferedReader d = null;
             BufferedInputStream in = null;
             in = new BufferedInputStream(urlconn.getInputStream());
             d = new BufferedReader(new InputStreamReader(in));
             String status = d.readLine();
             String errMsg = "**Error";
             if( status !=null && status.length() >= errMsg.length() &&
                 status.substring(0, errMsg.length() ).equals( errMsg ) ) {
                 MessageArea.getInstance().addMessage(
                         "Error writing file through URL: " + status + "\n" );
             }
             disconnectURL();
		}
		catch(Exception e) {
			 MessageArea.getInstance().addMessage( "URL FileWriter Error 2:" + e.getMessage() + "\n");
		}
    }

}