如何使用java执行CMD命令？

使用Java执行CMD命令可以通过以下步骤实现：

使用Java的Runtime类获取运行时对象：

Runtime runtime = Runtime.getRuntime();

使用runtime.exec()方法执行CMD命令：

Process process = runtime.exec("cmd /c <your_command>");

其中，<your_command>是你要执行的CMD命令。

可以通过process.getInputStream()获取命令执行的输出结果：

InputStream inputStream = process.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
    System.out.println(line);
}

可以通过process.getErrorStream()获取命令执行的错误信息：

InputStream errorStream = process.getErrorStream();
BufferedReader errorReader = new BufferedReader(new InputStreamReader(errorStream));
String errorLine;
while ((errorLine = errorReader.readLine()) != null) {
    System.out.println(errorLine);
}

使用process.waitFor()等待命令执行完成：

int exitCode = process.waitFor();
System.out.println("Command executed with exit code: " + exitCode);

完整的Java代码示例：

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public class ExecuteCMD {
    public static void main(String[] args) {
        try {
            Runtime runtime = Runtime.getRuntime();
            Process process = runtime.exec("cmd /c <your_command>");

            InputStream inputStream = process.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            InputStream errorStream = process.getErrorStream();
            BufferedReader errorReader = new BufferedReader(new InputStreamReader(errorStream));
            String errorLine;
            while ((errorLine = errorReader.readLine()) != null) {
                System.out.println(errorLine);
            }

            int exitCode = process.waitFor();
            System.out.println("Command executed with exit code: " + exitCode);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

注意事项：