java调用系统命令

由于java 是跨平台的，有时候我们需要用到操作系统的一些信息，为了方便期间，干脆就直接调用操作系统的命令来实现，比如查看IP地址,MAC地址等。不过两个在jdk6里面已经有了，不过以前都是用调用dos命令，然后获取输出的办法来做的，比如：

import java.io.*;
public class DT {
      public static void main(String[] args) throws IOException
      {
      String command="ipconfig";      Runtime r=Runtime.getRuntime();
      Process p=r.exec(command);
      BufferedReader br=new BufferedReader(new InputStreamReader(p.getInputStream()));
      StringBuffer sb=new StringBuffer();
      String inline;
      while(null!=(inline=br.readLine())){
      sb.append(inline).append("/n");
      }
      System.out.println(sb.toString());
      }
}

import java.io.*;
public class DT {
      public static void main(String[] args) throws IOException
      {
      String command="ipconfig";
      Runtime r=Runtime.getRuntime();
      Process p=r.exec(command);
      BufferedReader br=new BufferedReader(new InputStreamReader(p.getInputStream()));
      StringBuffer sb=new StringBuffer();
      String inline;
      while(null!=(inline=br.readLine())){
      sb.append(inline).append("/n");
      }
      System.out.println(sb.toString());
      }
}

 这样的话可以得到如下的结果：

Windows IP Configuration
Ethernet adapter VMware Network Adapter VMnet8:



   Connection-specific DNS Suffix  . :

   IP Address. . . . . . . . . . . . : 192.168.79.1

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . :



Ethernet adapter VMware Network Adapter VMnet1:



   Connection-specific DNS Suffix  . :

   IP Address. . . . . . . . . . . . : 192.168.23.1

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . :



Ethernet adapter 本地连接:



   Connection-specific DNS Suffix  . :

   IP Address. . . . . . . . . . . . : 192.168.100.12

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . : 192.168.100.250

Windows IP Configuration
Ethernet adapter VMware Network Adapter VMnet8:



   Connection-specific DNS Suffix  . :

   IP Address. . . . . . . . . . . . : 192.168.79.1

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . :



Ethernet adapter VMware Network Adapter VMnet1:



   Connection-specific DNS Suffix  . :

   IP Address. . . . . . . . . . . . : 192.168.23.1

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . :



Ethernet adapter 本地连接:



   Connection-specific DNS Suffix  . :

   IP Address. . . . . . . . . . . . : 192.168.100.12

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . : 192.168.100.250

 然而，当我在执行wmic 命令的时候，想要获取它的输出确不行了，看代码：

package test;

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

public class ManagerArgs {

    public static void main(String[] args) {
        try {

            Process p = Runtime.getRuntime().exec("cmd.exe /c wmic process get name,executablepath");

            BufferedReader br = new BufferedReader(new InputStreamReader(p
                    .getInputStream()));
            String line = "";
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
            br.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

package test;

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

public class ManagerArgs {

	public static void main(String[] args) {
		try {
		
			Process p = Runtime.getRuntime().exec("cmd.exe /c wmic process get name,executablepath");
		
			BufferedReader br = new BufferedReader(new InputStreamReader(p
					.getInputStream()));
			String line = "";
			while ((line = br.readLine()) != null) {
				System.out.println(line);
			}
			br.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

 程序在执行的时候就柱塞了，根本获取不到想ipconfig 那样的结果，把命令放到DOS 命令里面取执行，看图片：

这里确实可以的。难道wmic 命令的结果java 就取不到了吗？同样的都是dos 命令，为啥就有这样的区别呢？