BufferedWriter bw = new BufferedWriter( new FileWriter("/usr/text/test.txt" ) );
bw.write( "some text" );
bw.close();
BufferedReader br = new BufferedReader( new FileREader("("/usr/text/test.txt" ) );
String s = br.readLine();
br.close();
bw.write( "some text" );
bw.close();
BufferedReader br = new BufferedReader( new FileREader("("/usr/text/test.txt" ) );
String s = br.readLine();
br.close();
readLine();//读取一行
String content = "";
while((s=br.readLine())!=null){
content +=s;
}
//读所有行
sb.append("11111111111");
sb.append(" ");
i++;
...if(i==7)
sb.append("\r\n");
...
然后通过RandomAccessFile来写入具体文件的