提取文本信息中需要的信息行 存入另一个文本信息中

/*
  * 获取特定行的文本信息 放入另一个文本
  * readStr example:"D:/gongzuorizhi/wrapper.log.1"
  * writeStr example:"D:/gongzuorizhi/wrapper.log.2"
  * wantStr what's you want
  */
 public void getWantString(String readStr,String writeStr,String wantStr)
 {

  try{
     
      File read = new File(readStr);
      File write = new File(writeStr);
      BufferedReader br = new BufferedReader(
            new FileReader(read));
      BufferedWriter bw = new BufferedWriter(
            new FileWriter(write));
      String temp = null;
      //读出信息
      LineNumberReader r = new LineNumberReader(new FileReader(read));
//      System.out.println(r.read());
      while(r.read() != -1){
    temp = r.readLine();
//    System.out.println(temp);
    boolean a = temp.contains(wantStr);
    //比较是否有需要的行信息
    if(a)
    {
     bw.write(temp);
     bw.newLine();
    }
      }
      bw.close();
      br.close();
     }catch(FileNotFoundException e){ //文件未找到
      System.out.println (e);
     }catch(IOException e){
      System.out.println (e);
     }

 
 }