Java I/O操作

按字节读取读取文件，并且将文件里面的内容写到另外一个文件里面去

public class CopyBytes {  
    public static void main(String[] args) throws IOException {  
        FileInputStream in = null;  
        FileOutputStream out = null;  
        try {  
            in = new FileInputStream("xanadu.txt");  
            out = new FileOutputStream("outagain.txt");  
            int c;  
 
            while ((c = in.read()) != -1) {  
                out.write(c);  
            }  
 
        } finally {  
            if (in != null) {  
                in.close();  
            }  
            if (out != null) {  
                out.close();  
            }  
        }  
    }  
}  

------------------------------------------------------------------------

缓冲存储

public class CopyCharacters {  
    public static void main(String[] args) throws IOException {  
        FileReader inputStream = null;  
        FileWriter outputStream = null;  
 
        try {  
            inputStream = new FileReader("xanadu.txt");  
            outputStream = new FileWriter("characteroutput.txt");  
 
            int c;  
            while ((c = inputStream.read()) != -1) {  
                outputStream.write(c);  
            }  
        } finally {  
            if (inputStream != null) {  
                inputStream.close();  
            }  
            if (outputStream != null) {  
                outputStream.close();  
            }  
        }  
    }  
} 

 

------------------------------------------------------------------------------------

按行读取

public class CopyLines {  
    public static void main(String[] args) throws IOException {  
        BufferedReader inputStream = null;  
        PrintWriter outputStream = null;  
 
        try {  
            inputStream =   
                new BufferedReader(new FileReader("xanadu.txt"));  
            outputStream =   
                new PrintWriter(new FileWriter("characteroutput.txt"));  
 
            String l;  
            while ((l = inputStream.readLine()) != null) {  
                outputStream.println(l);  
            }  
        } finally {  
            if (inputStream != null) {  
                inputStream.close();  
            }  
            if (outputStream != null) {  
                outputStream.close();  
            }  
        }  
    }  
}  

----------------------------------------------------------------------------

直接读取文件内容

public class ScanXan {     
    public static void main(String[] args) throws FileNotFoundException {     
        Scanner s = null;     
        try {     
            s = new Scanner(new BufferedReader(new FileReader("xanadu.txt")));     
    
            while (s.hasNext()) {     
                System.out.println(s.next());     
            }     
        } finally {     
            if (s != null) {     
                s.close();     
            }     
        }     
    }     
}  

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