IO流在java中的实例操作

import java.io.*;

public class TestFileImportStream {

public static void main(String[] args) {

int b=0;

FileInputStream in = null;

try {

in =new FileInputStream("C:\\Users\\41639\\Desktop\\java\\FileText\\src\\TestFileImportStream.java");

}catch(FileNotFoundException e){

System.out.println("file is not found");

System.exit(-1);

}

try {

long num=0;

while ((b=in.read())!=-1) {

System.out.println((char)b);

num++;

}

in.close();

System.out.println();

System.out.println("共读取了"+num+"个字节");

}catch(IOException e) {

System.out.println("IO异常，读取失败");

System.exit(-1);

}

}

public class IOTest {

public static void write(File file) throws IOException {

FileWriter fw = new FileWriter(file, true);

// 要写入的字符串

String string = "松下问童子，言师采药去。只在此山中，云深不知处。";

fw.write(string);

fw.close();

}

public static String read(File file) throws IOException {

FileReader fr = new FileReader(file);

// 一次性取多少个字节

char[] chars = new char[1024];

// 用来接收读取的字节数组

StringBuilder sb = new StringBuilder();

// 读取到的字节数组长度，为-1时表示没有数据

int length;

// 循环取数据

while ((length = fr.read(chars)) != -1) {

// 将读取的内容转换成字符串

sb.append(chars, 0, length);

}

// 关闭流

fr.close();

return sb.toString();

}

}

public static void main(String[] args) throws IOException {

        BufferedReader buf = new BufferedReader(

                new InputStreamReader(System.in));

        String str = null;

        System.out.println("请输入内容");

        try{

            str = buf.readLine();

        }catch(IOException e){

            e.printStackTrace();

        }

        System.out.println("你输入的内容是：" + str);

}