java临时文件创建但内容写入问题

Question

package com.studytrails.tutorials.springremotingrmiserver;
import java.lang.Object;
import java.awt.Desktop;
import java.io.*;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.Resource;

public class GreetingServiceImpl implements GreetingService {
    @Override
    public String getGreeting(String name) {

        return "Hello " + name + "!";

    }


       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));
     File temp=File.createTempFile("output", ".tmp");



      String filePath=temp.getAbsolutePath();
     System.out.println(""+filePath);


      String line;
      PrintWriter out = new PrintWriter(new FileWriter(temp));
      //System.out.println(""+filePath);


      while ((line = br.readLine()) != null) {


          out.println(line);


      }


     String tem=temp.getName();
    //temp.setReadOnly();


      String[] cmd = {"notepad",tem}; 
      Runtime runtime = Runtime.getRuntime();

      Process proc = runtime.exec(cmd);

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

 temp.deleteOnExit();

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

       }


    }

在上面的代码中创建了临时文件，但我试图在该文件中写入内容，但是当程序执行时，记事本使用临时名称打开，但它给出消息文件不存在，您想创建吗？我需要该临时文件，其文本位于 D:\text\test.txt 位置。请推荐我

Answer 1

好的，这是应该可以工作的更新后的代码。我已经将其编写为 java 程序，但它可以工作。您的主要问题是您在进程打开后调用 temp.deleteOnExit(); 。您必须等待该过程完成，否则主线程甚至会在记事本打开文件之前删除该文件。还可以使用 out.write(line); 希望有帮助。

String line;
PrintWriter out = new PrintWriter(new FileWriter(temp));

while ((line = br.readLine()) != null) {
    out.write(line);
}
out.flush();
out.close();
br.close();

String[] cmd = { "notepad", filePath };
Runtime runtime = Runtime.getRuntime();

Process proc = runtime.exec(cmd);

out.close();
br.close();
try {
    proc.waitFor();
} catch (InterruptedException e) {
    e.printStackTrace();
}
temp.deleteOnExit();