File I/O的总结

1读写字符文件
　　BufferedReader br=new BufferedReader(new FileReader("文件路径"));
　　BufferedWriter bw=new BufferedWriter(new FileWriter("文件路径"，boolean));

public static void main (String[] args) throws Exception{ BufferedWriter bw=new BufferedWriter(new FileWriter("src/a.txt"); BufferedReader br=new BufferedReader(new FileReader("src/d.txt")); String str=null; while((str=br.readLine())!=-1){ System.out.println(str); } bw.close(); br.close(); }

 

2读写字节文件
　　DataInputStream dis=new DataInputStream(new FileInputStream("文件路径"));
　　DataOutputStream dos=new DataOutputStream(new FileOutputStream("文件路径"));

public static void main(String[] args) throws Exception { DataInputStream dis=new DataInputStream(new FileInputStream("src/a.jpg")); int a=dis.read(); System.out.println(a); dis.close(); DataOutputStream dos=new DataOutputStream(new FileOutputStream("src/b.jpg")); dos.write(255); dos.close(); //复制a.jpg--->b.jpg DataInputStream dis1=new DataInputStream(new FileInputStream("src/a.jpg")); DataOutputStream dos1=new DataOutputStream(new FileOutputStream("src/b.jpg")); int b; while((b=dis.read())!=-1){ dos.write(b); } dis.close(); dos.close(); }

 

3读取整个字符文件
　　String str=null;
　　while((str=br.readLine())!=-1){
　　　　System.out.println(str);
　　}
4读取整个字节文件
　　int b;
　　while((b=dis.read())!=-1){
　　　　System.out.println(b);
　　}