Java IO 文件的复制拷贝

FileInputStream FileOutputStream 对任意类型的文件 按字节数组进行拷贝

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/*
 *  字节流复制文件
 *   采用数组缓冲提高效率
 *   字节数组
 *   FileInputStream 读取字节数组
 *   FileOutputStream 写字节数组
 */
public class CopyFileByByte {
    public static void main(String[] args) {
        
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try{
            fis = new FileInputStream("c:\\t.zip");
            fos = new FileOutputStream("d:\\t.zip");
            //定义字节数组,缓冲
            byte[] bytes = new byte[1024*10];
            //读取数组,写入数组
            int len = 0 ; 
            while((len = fis.read(bytes))!=-1){
                fos.write(bytes, 0, len);
            }
        }catch(IOException ex){
            System.out.println(ex);
            throw new RuntimeException("文件复制失败");
        }finally{
            try{
                if(fos!=null)
                    fos.close();
            }catch(IOException ex){
                throw new RuntimeException("释放资源失败");
            }finally{
                try{
                    if(fis!=null)
                        fis.close();
                }catch(IOException ex){
                    throw new RuntimeException("释放资源失败");
                }
            }
        }
        
    }
}

 

 

FileReader FileWriter 仅限于文本文件的复制拷贝

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/*
 *  字符流复制文本文件,必须文本文件
 *  字符流查询本机默认的编码表,简体中文GBK
 *  FileReader读取数据源
 *  FileWriter写入到数据目的
 */
public class Copy_2 {
    public static void main(String[] args) {
        FileReader fr = null;
        FileWriter fw = null;
        try{
            fr = new FileReader("c:\\1.txt");
            fw = new FileWriter("d:\\1.txt");
            char[] cbuf = new char[1024];//按字符数组读取
            int len = 0 ;
            while(( len = fr.read(cbuf))!=-1){
                fw.write(cbuf, 0, len);
                fw.flush();//刷新缓存
            }
            
        }catch(IOException ex){
            System.out.println(ex);
            throw new RuntimeException("复制失败");
        }finally{
            try{
                if(fw!=null)
                    fw.close();
            }catch(IOException ex){
                throw new RuntimeException("释放资源失败");
            }finally{
                try{
                    if(fr!=null)
                        fr.close();
                }catch(IOException ex){
                    throw new RuntimeException("释放资源失败");
                }
            }
        }
    }
}

 BufferedReader BufferedWriter

/*
 *  使用缓冲区流对象,复制文本文件
 *  数据源  BufferedReader+FileReader 读取
 *  数据目的 BufferedWriter+FileWriter 写入
 *  读取文本行, 读一行,写一行,写换行
 */
public class Copy_1 {
    public static void main(String[] args) throws IOException{
        BufferedReader bfr = new BufferedReader(new FileReader("c:\\w.log"));    
        BufferedWriter bfw = new BufferedWriter(new FileWriter("d:\\w.log"));
        //读取文本行, 读一行,写一行,写换行
        String line = null;
        while((line = bfr.readLine())!=null){
            bfw.write(line);//写一行
            bfw.newLine();//写换行
            bfw.flush();
        }
        bfw.close();
        bfr.close();
    }
}