java基础 IO流

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;


public class five {
public static void main(String[] args) throws IOException {
FileInputStream fis = new FileInputStream("D:\\HelloWord.java");
FileReader fis1 = new FileReader("D:\\HelloWord.java");
// FileWriter sed = new FileWriter("D:\\HelloWord.java");
BufferedReader br = new BufferedReader(fis1);
FileReader fis2 = new FileReader("D:\\HelloWord.java");
// System.out.println(br.read());
// System.out.println(fis.read());
String s = br.readLine();
System.out.println(s);
int i;
try {
while ((i = fis.read()) != -1) {
System.out.print((char) i);
}
//fis.close();
} catch (Exception e) {
e.printStackTrace();
}
try {
int b;
while ((b = fis2.read()) != -1) {
System.out.print((char) b);
}
//fis1.close();
} catch (Exception e) {
e.printStackTrace();
}
}

}

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;


public class six {
public static void main(String[] args) throws IOException {
// File a = new File("D:\\HelloWord1.java");
// a.createNewFile();
// File b = new File("D:\\HelloWord2.java");
// b.createNewFile();
// File c = new File("D:\\HelloWord3.java");
// c.createNewFile();
FileOutputStream file = new FileOutputStream("D:\\HelloWord1.java");
//FileWriter file1 = new FileWriter("D:\\HelloWord2.java");
BufferedWriter file2 = new BufferedWriter(new FileWriter("D:\\HelloWord2.java"));
FileWriter file3 = new FileWriter("D:\\HelloWord3.java");
try {
// byte d[] = {'A','B','C','D','E','F','G'};
// file.write(d);
file.write("ABCDEFG OutputStream".getBytes());
file.close();
} catch (Exception e) {
e.printStackTrace();
}
// try {
// file1.write("A,B,C,D,E,F,G FileWriter");
// //file1.close();
// } catch (Exception e) {
// e.printStackTrace();
// }
try {
file2.write("BufferedWriter");
// file2.flush();
//file1.close();
file2.close();
} catch (Exception e) {
e.printStackTrace();
}
try {
file3.write("FileWriter");
file3.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

小结：

1.File 建立文件管理

2.FileInputStream FileOutputStream 字节的输入输出 

3.FileReader FileWriter 字符的输入输出

4.BufferedReader BufferedWriter利用字符流输入输出