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Regular Expression 正则表达式-2 (Java)

作者:未知 来源:月光软件站 加入时间:2005-2-28 月光软件站

又用Java实现了一个,发现Java的正则表达式略有不同,而且也感觉到了Java的读写文件很不雅观。

/*
* Created on 2004-10-1
*/
import java.util.regex.*;
import java.io.*;

/**
* @author dancefire
*/
public class DataFilter {

    
public static void main(String[] args) {
        if(
args.length < 2)
        {
            
System.err.println("Please enter 2 filenames(e.g. In.txt Out.txt)");
            return;
        }
        
String strIn = null, strOut = null;
        
        
//    Get string from a file
        
strIn = readFile(args[0]);
        
//    Process
        
strOut = filter(strIn);
        
//    Store Result into a file
        
writeFile(args[1], strOut);
        
    }
    
private static void writeFile(String filename, String data)
    {
        
BufferedWriter wr = null;
        
try{
            
wr = new BufferedWriter( new FileWriter(filename));
            
wr.write(data);
        }
catch( Exception e )
        {
            
e.printStackTrace();
        }
finally{
            
try{
                if(
wr != null )
                    
wr.close();
            }
catch( Exception e ){
                
e.printStackTrace();
            }
        }
        return;
    }
    
private static String readFile(String filename)
    {
        
String strRet = null;
        
BufferedReader rd = null;
        
try{
            
rd = new BufferedReader( new FileReader(filename));
            
String line = null;
            
StringBuffer sb = new StringBuffer();
            while( (
line=rd.readLine()) != null )
            {
                
sb.append(line);
            }
            
strRet = sb.toString();            
        }
catch( Exception e )
        {
            
e.printStackTrace();
        }
finally{
            
try{
                if(
rd != null )
                    
rd.close();
            }
catch( Exception e ){
                
e.printStackTrace();
            }
        }
        return
strRet;
    }
    
private static String filter(String input)
    {
        
Pattern p = Pattern.compile("\"(\\w+):(\\w+)%(\\w+)\"");
        
Matcher m = p.matcher(input);
        
StringBuffer sb = new StringBuffer();
        while(
m.find())
        {
            
sb.append( m.group(1) + ":" + m.group(2) + "*" + m.group(3) + "," + System.getProperty("line.separator") );
        }
        return
sb.toString();
    }
}




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