java IO流之三 使用缓冲流来读写文件

package org.example.io;  
  
import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.File;  
import java.io.FileNotFoundException;  
import java.io.FileReader;  
import java.io.FileWriter;  
import java.io.IOException;  
  
public class TestBufferedWriter {  
  
    public static void main(String[] args) throws Exception {  
        write();  
        read();  
    }  
  
    /** 
     * DOC 读取信息. 
     *  
     * @throws FileNotFoundException 
     * @throws IOException 
     */  
    private static void read() throws FileNotFoundException, IOException {  
        File file = new File("E:\\a.txt");// 指定要读取的文件  
        // 获得该文件的缓冲输入流  
        BufferedReader bufferedReader = new BufferedReader(new FileReader(file));  
        String line = "";// 用来保存每次读取一行的内容  
        while ((line = bufferedReader.readLine()) != null) {  
            System.out.println(line);  
        }  
        bufferedReader.close();// 关闭输入流  
    }  
  
    /** 
     * DOC 写入信息. 
     *  
     * @throws IOException 
     */  
    private static void write() throws IOException {  
        File file = new File("E:\\a.txt");// 指定要写入的文件  
        if (!file.exists()) {// 如果文件不存在则创建  
            file.createNewFile();  
        }  
        // 获取该文件的缓冲输出流  
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file));  
        // 写入信息  
        bufferedWriter.write("你好世界");  
        bufferedWriter.newLine();// 表示换行  
        bufferedWriter.write("hello world");  
        bufferedWriter.flush();// 清空缓冲区  
        bufferedWriter.close();// 关闭输出流  
    }  
  
}  

package org.example.io;  
  
import java.io.BufferedInputStream;  
import java.io.BufferedOutputStream;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
  
public class TestBufferedString {  
  
    public static void main(String[] args) throws Exception {  
        // 指定要读取文件的缓冲输入字节流  
        BufferedInputStream in = new BufferedInputStream(new FileInputStream("F:\\test.jpg"));  
        File file = new File("E:\\test.jpg");  
        if (file != null) {  
            file.createNewFile();  
        }  
        // 指定要写入文件的缓冲输出字节流  
        BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(file));  
        byte[] bb = new byte[1024];// 用来存储每次读取到的字节数组  
        int n;// 每次读取到的字节数组的长度  
        while ((n = in.read(bb)) != -1) {  
            out.write(bb, 0, n);// 写入到输出流  
        }  
        out.close();// 关闭流  
        in.close();  
    }  
  
}