java 如何使用java程序运行命令提示符命令？
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How to use java program to run command prompt commands?
提问by Woobie
this is my first time posting here, so I'm not really sure what to say/ask. Anyways, I am trying to make a simple java program that runs command prompt commands from the java program, mainly used for ping flood (ping flooding myself).
这是我第一次在这里发帖，所以我不确定该说什么/问什么。无论如何，我正在尝试制作一个简单的java程序，该程序从java程序中运行命令提示符命令，主要用于ping flood（ping flooding自己）。
Here is my current code
这是我当前的代码
public class Core extends JFrame {
JTextField ipTextField;
int packets = 0;
boolean running = false;
public Core() {
super("Fatique");
Container container = getContentPane();
JButton bAttack = new JButton("Start Attack");
JButton bStop = new JButton("Stop Attack");
JPanel jPanel = new JPanel();
container.setLayout(new FlowLayout());
ipTextField = new JTextField("IP Address", 30);
container.add(ipTextField);
bAttack.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String input = ipTextField.getText();
String[] value = input.split(":");
int amountOfPackets = Integer.parseInt(value[1]);
exec("cmd /c" + input + " -t -n " + amountOfPackets);
running = true;
}
});
bStop.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
stop();
}
});
if(!running) {
jPanel.add(bAttack);
} else {
jPanel.add(bStop);
}
add(jPanel);
}
public void exec(String cmd) {
try {
Process p = Runtime.getRuntime().exec(cmd);
System.out.println(getOutput(p) + " - " + getPacketsSent());
} catch (IOException e) {
e.printStackTrace();
}
}
public String getOutput(Process p) {
String output = null;
try {
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
output = line;
packets++;
}
return output;
} catch (IOException e) {
System.err.println(e.getStackTrace());
}
return null;
}
public int getPacketsSent() {
return packets;
}
public void stop() {
exec("cmd /c break");
running = false;
}
public static void main(String[] args) {
Core c = new Core();
c.setSize(500, 300);
c.setVisible(true);
c.setResizable(false);
c.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
c.setLocationRelativeTo(null);
}
I'm quite new at java, so that might not do what I want it to do. What I want it to do is I enter an ip address in the textfield, and split it with ":", and after that the amount of packets, for instance
我对 Java 还很陌生，所以这可能不会做我想做的事情。我想要它做的是我在文本字段中输入一个 ip 地址，并用“：”分割它，然后是数据包的数量，例如
127.0.0.1:100
Though now when I try to use that ip and packet amount, it returns "null - 0" (from exec method), and I'm not even sure if it did anything related to ping.
虽然现在当我尝试使用该 ip 和数据包数量时，它返回“null - 0”（来自 exec 方法），我什至不确定它是否做了与 ping 相关的任何事情。
What I am trying to accomplish is as I already said, ping flood myself, and then output whatever I get as response, though I have no idea if this code does anything even related to that, I mostly use logic when coding java.
我想要完成的是，正如我已经说过的那样，ping 自己，然后输出我得到的任何响应作为响应，尽管我不知道这段代码是否做了与此相关的任何事情，但我在编写 java.lang.Object 时主要使用逻辑。
public String getOutput(Process p) {
String output = null;
try {
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
output = line;
packets++;
}
return output;
} catch (IOException e) {
System.err.println(e.getStackTrace());
}
return null;
}
Could someone explain me why my code code is not working how I want it to work? Please don't judge, as I already said, I'm quite new to java programming.
有人可以解释我为什么我的代码无法正常工作吗？请不要判断，正如我已经说过的，我对 Java 编程还很陌生。
EDIT: Here is a quick "informative" explanation of what I am trying to accomplish.
编辑：这是对我要完成的工作的快速“信息性”解释。
- I type in an ip address and how many packets I want to send. In this explanation, I am using localhost ip, and 5 packets.
I start the attack. At this part, I want the program to run cmd prompt command
ping 127.0.0.1 -t -n 5
127.0.0.1 being the ip that I put in the textfield in my program, and 5 is the amount of packets I put in the textfield.
I started the attack, so this is what should happen in the command prompt:
The language is Finnish, but still the same thing.
This is the basic explanation of what I am trying to accomplish, hopefully someone understood and can help/tell why my code is not working, or is working but not printing the proper lines in eclipse console.
- 我输入一个IP地址和我想发送多少数据包。在这个解释中，我使用 localhost ip 和 5 个数据包。
我开始进攻。在这部分，我希望程序运行 cmd prompt 命令
平 127.0.0.1 -t -n 5
127.0.0.1 是我在程序中放入文本字段的 ip，而 5 是我放入文本字段中的数据包数量。
我开始了攻击，所以这就是命令提示符中应该发生的事情：
语言是芬兰语，但还是一样的东西。
这是我试图完成的基本解释，希望有人理解并可以帮助/说明为什么我的代码不工作，或者工作但没有在 Eclipse 控制台中打印正确的行。
回答by Pablo Santa Cruz
Try something like this:
尝试这样的事情：
try {
Runtime rt = Runtime.getRuntime();
Process p = rt.exec("ping 192.168.16.67");
InputStream in = p.getInputStream();
OutputStream out = p.getOutputStream ();
InputStream err = p.getErrorStream();
p.destroy();
} catch(Exception exc) {}
Then, you'll have to read the outvariable to parse the pingcommand output continuously.
然后，您必须读取out变量以ping连续解析命令输出。
回答by Stephen C
There is a problem with your getOutput method. It looks like you intend to collect every line of output. But in fact, since you are assigning lineto output, you will only return the last line before the end of stream.
您的 getOutput 方法有问题。看起来您打算收集每一行输出。但实际上，由于您分配line给output，您只会返回流结束之前的最后一行。
To fix this, change
要解决此问题，请更改
output = line;
to
到
output += line + "\n";
Or to be more correct:
或者更准确地说：
output += line + LINE_SEPARATOR;
where you previously declared the latter as:
您之前将后者声明为：
final String LINE_SEPARATOR = System.getProperty("line.separator");
That doesn't directly explain why you are getting null, but that might be because the command you are running is writing output to the 'error' stream rather than the 'output' stream.
这并不能直接解释您为什么会得到null，但这可能是因为您正在运行的命令正在将输出写入“错误”流而不是“输出”流。
回答by Rushi M Thakker
bAttack.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String input = ipTextField.getText();
String[] value = input.split(":");
int amountOfPackets = Integer.parseInt(value[1]);
try {
p=Runtime.getRuntime().exec("ping -n "+amountOfPackets+" "+value[0]);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
running = true;
}
Just a small modification of your code. get output is as:
只是对您的代码稍作修改。获取输出为：
public String getOutput(Process p) {
String output = null;
try {
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
output =output+ line+"\n";
packets++;
}
return output;
} catch (IOException e) {
System.err.println(e.getStackTrace());
}
return null;
}
Here output is JTextArea I have taken to display the output of PING process. I cannot show you the output because I lack reputation.
这里的输出是我用来显示 PING 过程输出的 JTextArea。我无法向您展示输出，因为我缺乏声誉。
I don't know why first line is null. Anyway, it works.
我不知道为什么第一行是空的。无论如何，它有效。
Hope this help you. Have good time coding.
希望这对你有帮助。玩得开心编码。
