java中执行cmd命令

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


/**
 * 执行命令行命令的工具类，用于执行python程序
 * @author ChenRui
 *
 */
public class CmdUtils {


public static void cmdExecute(String cmd, String codePath, String input, String output, String arg){
Process process;
StringBuffer sb = new StringBuffer("cmd /c \"");// '/c'不能少
sb.append(cmd+" ");
sb.append(codePath);
sb.append(" -i ");
sb.append(input).append(" -o ").append(output);
if(arg != null && Integer.parseInt(arg) > 0){
sb.append(" -k ").append(arg);
}
sb.append("\"");
try {  
            Runtime runtime = Runtime.getRuntime();  
  
            System.out.println("开始执行...");  
            process = runtime.exec(sb.toString());  
  
            //打印执行的输出结果  
            InputStream is = process.getInputStream();  
            InputStreamReader isr = new InputStreamReader(is, "gbk"); //gbk：解决输出乱码  
            BufferedReader br = new BufferedReader(isr);  
            String line;  
            while ((line = br.readLine()) != null){  
                System.out.println(line);  
            }  
  
            is.close();  
            isr.close();  
            br.close();  
        }catch (IOException e){  
            e.printStackTrace();  
        }  
}

public static void main(String[] args) {
// cmdExecute("python", "data/k_means.py", "data/788points.txt", "data/out.csv", "5");
cmdExecute("python", "data/cluster_show.py", "data/out.csv", "data/out.png", "5");
}
}