java中如何读写文件

读文件

import java.io.*;

public class BufferedReaderTest {

public static void main(String[] args) throws Exception {
//读文件：c:\\a.txt
FileReader fileReader = new FileReader("c:\\a.txt");
BufferedReader bufReader = new BufferedReader(fileReader);
String s = bufReader.readLine();//读取一行数据
while (s!=null) {
System.out.println(s);
s = bufReader.readLine();//读取下一行数据
}
bufReader.close();
fileReader.close();
}
}

写文件

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.Writer;

public class FileWriterTest {

/**
* @param args
* @throws FileNotFoundException
*/
public static void main(String[] args) throws Exception {
FileWriter w = new FileWriter("c:\\a.txt");//FileNotFoundException
w.write("hello\r\n"); //IOException
w.write("world"); //IOException
w.close();
}
}
关于文件续写问题