使用Runtime.exec时读取错误

有人问过这个问题 once before on Stack Overflow ,但堆栈跟踪与我的不同,我不认为这是由同一件事引起的。

这是我的堆栈跟踪:

java.io.IOException: Read error
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at General.App.cmdString(App.java:393)
at General.App.cpauString(App.java:422)
at Functionality.RegistryScanThread.USBDScan(RegistryScanThread.java:109)
at Functionality.RegistryScanThread.doInBackground(RegistryScanThread.java:51)
at Functionality.RegistryScanThread.doInBackground(RegistryScanThread.java:1)
at javax.swing.SwingWorker$1.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at javax.swing.SwingWorker.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

这是我编写的更复杂程序的简化版本:

import java.util.*;
import java.io.*;
public class Test {

//global vars

public Test(){
    // initializeing stuffs
}
public static void main(String[] args){
    ArrayList<String> str = cmdString("reg query hklm");
    for(String s : str){
        System.out.println(s);
    }
}

public static ArrayList<String> cmdString(String command){
    boolean success = false;
    ArrayList<String> result = new ArrayList<String>();
    String line = "";
    try{ 
        Process p = Runtime.getRuntime().exec(command);
        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
            while ((line = input.readLine()) != null) {result.add(new String(line));}
        BufferedReader input2 = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            while ((line = input2.readLine()) != null) {result.add(new String(line));}
        int exitvalue = p.waitFor();
        if (exitvalue != 0){
            System.out.println("error!!");
            success = false;

        }
        else{
            success = true;
        }
        for(String s : result){
            System.out.println(s);
        }
        input.close();
        input2.close();
        return result;
    } catch(Exception e) {
        e.printStackTrace(System.err);
        System.out.println("error!!!");
        return result;
    }
}
}

大体上在上面的例子中,错误并不是真正可见的。但在我的程序中,它正确地执行了所有内容 我第一次运行它 .

然后当我第二次或第三次运行它时,会出现错误。而且当我等待一段时间再运行它时,似乎没有出现任何错误。

我该如何解决这个问题?