复制代码 代码如下:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;

public class IORead {

/**
* @param args
*文件的读写
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try {

// 方法一

BufferedReader br = new BufferedReader(new FileReader(new File(

"D:/project/transfar/doc/1.txt")));

// StringBuilder bd = new StringBuilder();

StringBuffer bd = new StringBuffer();

while (true) {

String str = br.readLine();

if (str == null) {

break;

}
System.out.println(str);

bd.append(str);

}

br.close();

// System.out.println(bd.toString());

// 方法二

InputStream is = new FileInputStream(new File("D:/project/transfar/doc/1.txt"));

byte b[] = new byte[Integer.parseInt(new File("D:/project/transfar/doc/1.txt").length()

+ "")];

is.read(b);
System.out.write(b);

System.out.println();

is.close();

// 方法三

Reader r = new FileReader(new File("D:/project/transfar/doc/1.txt"));

char c[] = new char[(int) new File("D:/project/transfar/doc/1.txt").length()];

r.read(c);

String str = new String(c);

System.out.print(str);

r.close();

} catch (RuntimeException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}