java文件写入怎样换行

[不靠谱的哥哥]

import java.io.*;

import javax.swing.JOptionPane;

public class test {

public static void main(String []args){


try{

FileInputStream fis=new FileInputStream("namefile.txt");

InputStreamReader dis=new InputStreamReader(fis);

BufferedReader reader=new BufferedReader(dis);

String s,str="";


while((s=reader.readLine())!=null){

str+=s;

str+="\r\n";

System.out.println(str);

}


dis.close();

FileOutputStream fos=new FileOutputStream("namefile.txt");

DataOutputStream dos=new DataOutputStream(fos);

//BufferedWriter writer=new BufferedWriter(dos);

String ss="TonHankes";

str=str+ss;

dos.writeChars(str);

dos.close();

}

catch(IOException e){

System.out.println(e);

}

}

}

这是一个我写的关于文件写入的代码，但不知道怎么实现换行，"\r\n"也不奏效
跪求高手解答

[gulang76]

FileOutputStream   fos   =   new   FileOutputStream( "d:\\test.txt "); 
String   nextLine   =   System.getProperty( "line.separator "); 
String   testStr   =   "abcd "+nextLine+ "efgh "+nextLine+ "igkl "; 
byte[]   c   =   testStr.getBytes(); 
fos.write(c); 
fos.close();

[buzaibeishang4617016]

没学到哪，顶一下

[robin_hood2012]

用\n换行试试

[taotao119]

用BufferedWriter类的newLine()就可以了

[tjb1216]

1楼跟5楼都能行，鉴定完毕

[So_So]

这个用stringbuffer 很好用的

[So_So]

File file = new File("src/ftp.txt");
FileReader fd = new FileReader(file);
BufferedReader br = new BufferedReader(fd);
StringBuilder sb = new StringBuilder();
String str = "";
while ((str = br.readLine()) != null)
{
sb.append(str);
sb.append("\n");
}
int lenth = 100;
String str2=sb.toString();
sb.setLength(0);
for (int i = 1; i <= lenth; i++)
{
str=str2.replaceAll(temp1,i+"");
sb.append(str);
sb.append("\n");
}
FileOutputStream out=new FileOutputStream(file);
out.write(sb.toString().getBytes());
out.close();
}

[zhuyouyong]

顶[Quote=引用 1 楼 gulang76 的回复:]
Java code
FileOutputStream fos = new FileOutputStream( "d:\\test.txt ");
String nextLine = System.getProperty( "line.separator ");
String testStr = "abcd "+nextLine+ "efgh "+n……
[/Quote]

[cz_study_java]

学习一下

[zhouwolf]

1楼的不行。