IO流

来源：互联网发布：对外贸易大学法律知乎编辑：程序博客网时间：2024/06/05 07:01

字节流：

public class Test1 {

public static void main(String args[]){
  FileInputStream fis = null;
  FileOutputStream fos = null;

  try{
   fis = new FileInputStream("e:/from.txt");
   fos = new FileOutputStream("e:/to.txt");
   byte[] buffer = new byte[1024];
   while(true){
       int temp = fis.read(buffer, 0, buffer.length);
       if(temp == -1){
        break;
       }
        fos.write(buffer, 0, temp);
   }

  }catch (Exception e) {
  }finally{
   try {
    fis.close();
    fos.close();
   } catch (IOException e) {
    e.printStackTrace();
   }

  }
}
}

字符流：

public class Test {

public static void main(String args[]){
  FileReader fr = null;
  FileWriter fw = null;
  try{
   fr = new FileReader("e:/from.txt");
   fw = new FileWriter("e:/to.txt");
      char[] buffer = new char[1024];
      while(true){
      int temp = fr.read(buffer, 0, buffer.length);
      if(temp == -1){
      break;
      }
      fw.write(buffer, 0, temp);
      }
  }catch (Exception e) {
  }
  finally{
   try {
    fr.close();
    fw.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
}
}

读取整行：

public class Test2 {

public static void main(String args[]){
  FileReader fileReader = null;
  BufferedReader bufferedReader = null;
  try{
   fileReader = new FileReader("e:/from.txt");

   bufferedReader = new BufferedReader(fileReader);
   String line = null;
   while(true){
    line = bufferedReader.readLine();
    if(line == null){
     break;
    }
   }
  }catch (Exception e) {
  }
}
}