从字符串值读取子字符串 [英] Reading a substring from a string value

问题描述

我为Windows写了一个Java命令行应用程序，并将该cmd的结果存储在一个字符串变量中。

I wrote a Java command line application for Windows, and stored the result of that cmd in a string variable.

我的问题是：我从那里我存储了cmd的输出的变量子字符串？

My question is: Is it possible to get a substring from that variable from where I had stored the output of the cmd?

我想要一个语句创建一个操作，如果在cmd输出字符串中找到一个子字符串

I want to put a statement that creates an action if a substring is found in the cmd output string variable.

以下是应用程序类的方法：

Here are the methods of the application class:

public static void main(String[] args) throws IOException, InterruptedException
{
    runWndCommand("ping 192.168.11.3");
}

public static void runWndCommand(String cmd) throws IOException, InterruptedException
{
    Runtime runtime = Runtime.getRuntime();
    Process p = runtime.exec(new String[] { "cmd.exe", "/C", cmd });

    Scanner reader = new Scanner(p.getInputStream());

     while (reader.hasNext())
     {
        String r=reader.nextLine();
        System.out.println(r);
     }
     p.waitFor();
 }

推荐答案

在您的示例中使用 contains（）：

String r = reader.nextLine();

System.out.println(r);

if (r.contains("abc")) {
    System.out.println("abc found");
} else {
    System.out.println("abc not found");
}

这将打印 abc found if abc是 r 内的子字符串。

This will print abc found if "abc" is a substring within r.

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