Question

 public String getText()
       {
           ApplicationContext appContext = new ClassPathXmlApplicationContext(new String[]{"spring-config-server.xml"});

Resource resource = appContext.getResource("file:D:\\text\\test.txt");
StringBuilder builder = new StringBuilder();
try{

  InputStream is = resource.getInputStream();
  BufferedReader br = new BufferedReader(new InputStreamReader(is));

  String line;
  PrintWriter out=null;
  while ((line = br.readLine()) != null) {
     //System.out.println(line);
       out = new PrintWriter(new FileWriter("D:\\outputfile.txt"));
      out.println(line);


      //br.close();
  } 

  out.close();
  br.close();

}catch(IOException e){
    e.printStackTrace();
    }
return builder.toString();

       }

Answer 1

在while循环中创建PrintWriter实例。

Answer 2

您正在循环中创建新的PrintWriters。把它放在外面。

out = new PrintWriter(new FileWriter("D:\\outputfile.txt")); 
while ((line = br.readLine()) != null) {
 //System.out.println(line);

  out.println(line);


  //br.close();
}

Answer 3

将它移到循环之外。每行创建new个实例

out = new PrintWriter(new FileWriter("D:\\outputfile.txt"));

Answer 4

在每次循环迭代期间，PrintWriter被分配给新实例。在循环之外声明PrintWriter。

  String line;
  PrintWriter out= new PrintWriter(new FileWriter("D:\\outputfile.txt"));

  while ((line = br.readLine()) != null) {  
      out.println(line);
  }

PrintWriter对象不会将文本文档中的所有行打印到输出文件中

4 个答案: