Help with Read/Write File

Question

hi I was wondering if someone can help me do some read/write file with java. here is what I want to do:
Read a file and search the whole file for a word such as "throw" and print out the rest of that line to a new file. in the case of "throw", i want to link all thrown exceptions to the file that contained them.
can someone help me out and let me know what way I can approach in this?
any help would be greatly appreciated.
thanks!

Answer 1

Rough and dirty, here's a class that will read a file and return a resultset:
import java.io.*;
import java.nio.*;
import java.nio.channels.FileChannel;
import java.util.*;
import java.text.DateFormat;
public class Utils{
     File fileName;
     FileOutputStream outputFile;
     boolean closeChannel;
     //Constructor
     public Utils(String directory, String filename){
          String strFileDir = directory;
          String strFileName = filename;          
          File fileDir = new File(strFileDir);
          fileName = new File(fileDir, strFileName);
          // If directory does not exhist, create it.
          if(!fileDir.isDirectory()){
               if(fileDir.mkdirs()){
                    System.out.println(fileDir + " created.");
               else{
                    System.out.println(fileDir + " could not be created.");                    
public ArrayList readText() throws IOException{          
          // Read content of file into a collection
          ArrayList arrayList = new ArrayList();
          try{
               BufferedReader in = new BufferedReader(new FileReader(fileName));
               String line;
               while((line = in.readLine()) != null){
                    arrayList.add(line);
               in.close();               
          catch (IOException ex){
               throw ex;
          return arrayList;          
     }And here's how you use the class:
// Create a new Disk Utilities object.  This can be used for all subsequent read/writes to this file.
          Utils utilTest = new Utils("e:/testing", "Testing.txt");
// Create a collection to hold the data from the file.
          ArrayList arrayList = new ArrayList();
          try{arrayList = utilTest.readText();}catch(IOException ex){ex.printStackTrace(System.err);}