如何将数据附加到文件？

我试着写入txt文件。
但是丢失已经存储在文件中的数据。

但是我的问题是，当我把字符串放在txt文件中时，新字符串会覆盖我之前放入的旧字符串。

我的代码是：

public void addWorker(Worker worker){ workers.put(worker.getId(), worker); } public void printWorker (String id){ Worker work = (Worker) workers.get( id ); if (work == null) { System.out.println("Worker NOT found"); } else { work.printText(); } } public void printWorkers() { if (workers.size() == 0) { System.out.println("No workres"); return; } Collection c = workers.values(); Iterator itr = c.iterator(); System.out.println("Workers in division "+dName+ ":"); while (itr.hasNext()) { Worker wo = itr.next(); wo.printText(); } } public void writeToFile(){ PrintWriter pw = null; try{ pw = new PrintWriter(new File("d:\\stam\\stam.txt")); Collection c = workers.values(); Iterator itr = c.iterator(); while (itr.hasNext()) { Worker wo = itr.next(); pw.write("worker: "+wo.getId()+", "+wo.getName()+", "+wo.getAddress()+", "+wo.getSex()); pw.println(); } } catch(Exception e) { System.out.println(e); } finally { if (pw != null) { pw.close(); } } } } 

你可以帮我吗？

Answer 1

您必须将Stream设置为追加模式，如下所示：

 pw = new PrintWriter(new FileWriter("d:\\stam\\stam.txt", true)); 

Answer 2

创建一个单独的变量来强调它，附加到文件。

 boolean append = true; pw = new PrintWriter(new FileWriter(new File("filepath.txt"), append)); 

Answer 3

使用带有第二个参数’true’的FileWriter和一个BufferedWriter：

 FileWriter writer = new FileWriter("outFile.txt", true); BufferedWriter out = new BufferedWriter(writer); 

Answer 4

在Java 7中，

 Files.write(FileSystems.getDefault().getPath(targetDir,fileName), strContent.getBytes(),StandardOpenOption.CREATE,StandardOpenOption.APPEND);