不知道哪里出错求指教 - 黑马程序员技术交流社区

package cn.text;
import java.io.*;
import java.util.Scanner;
public class Foo {
public static void main(String[] args) throws FileNotFoundException, IOException {
// TODO code application logic here
PrintStream ps = null;
FileInputStream fis = null;
try
{
ps = new PrintStream(new FileOutputStream("test.txt"));
String[] cmd = {"cmd.exe ","/c","ipconfig","netstat"," > F:\\ababab.txt"};
// Process p= Runtime.getRuntime().exec("cmd.exe /c ipconfig > F:\\more.txt");
Process p= Runtime.getRuntime().exec(cmd);
}
catch(IOException ex)
{
ex.printStackTrace();
}
finally
{
if(ps != null)
{
ps.close();
}
}
}
}

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package com.heima;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class UseCmdTest2 {
public static void main(String[] args) throws IOException, InterruptedException {
//我输出到f盘hell.txt，等会截图你们看看。。但是后面readLine读出来的为什么为null啊，，，，，，，求指教。
String[] cmd = {"cmd.exe", "/c","ipconfig -all",">F:\\hello.txt"};
Process p = Runtime.getRuntime().exec(cmd);
System.out.println(p.getInputStream().toString());
//在网上查到大家都是这么用的。。
new Thread(new InputStreamDetection(p.getInputStream())).start();
new Thread(new InputStreamDetection(p.getErrorStream())).start();
p.getOutputStream().close();
int exitValue = p.waitFor();
//返回o说明成功了。返回1说明失败！
System.out.println("return:"+exitValue);
}
}
class InputStreamDetection implements Runnable {
private InputStream is;
public InputStreamDetection(InputStream ins) {
this.is = ins;
}
@Override
public void run() {
BufferedReader br = new BufferedReader(new InputStreamReader(is));
//StringBuffer sb = new StringBuffer();
String inputLine = null;
try {
System.out.println("br.readLine():"+br.readLine());
while(null != (inputLine = br.readLine())) {
//sb.append(inputLine).append("\n");
System.out.println("inputLine:"+inputLine);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

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