将字符串写进txt中方式

try {
           File file = new File(filePath);
            PrintStream ps = new PrintStream(new FileOutputStream(file));
            ps.println("http://www.docin.com/p-315288370.html");// 往文件里写入字符串
            ps.append("http://www.docin.com/p-315288370.html");// 在已有的基础上添加字符串
         } catch (FileNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
 }  

 try {
            FileWriter fw = new FileWriter(filePath, true);
            BufferedWriter bw = new BufferedWriter(fw);
            bw.append("在已有的基础上添加字符串");
            bw.write("abc\r\n ");// 往已有的文件上添加字符串
             bw.write("def\r\n ");
             bw.write("hijk ");
           bw.close();
           fw.close();
        } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
  }  

try {
             PrintWriter pw = new PrintWriter(new FileWriter(filePath));
            pw.println("abc ");
             pw.println("def ");
            pw.println("hef ");
            pw.close();
       } catch (IOException e) {
            // TODO Auto-generated catch block
           e.printStackTrace();
        } 

  try {
             RandomAccessFile rf = new RandomAccessFile(filePath, "rw");
             rf.writeBytes("op\r\n");
            rf.writeBytes("app\r\n");
            rf.writeBytes("hijklllll");
             rf.close();
         } catch (IOException e) {
            e.printStackTrace();
        }  

 try {
             FileOutputStream fos = new FileOutputStream(filePath);
             String s = "http://www.docin.com/p-315288370.html";
             fos.write(s.getBytes());
            fos.close();
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
        }