最好的执行系统命令的方法就是写个bat文件或是shell脚本。然后调用,那样修改和实现就简点多了。
现在执行外部命令,主要的方式,还是通过调用所以平台的SHELL去完成,WINDOWS下面就用CMD,LINUX或者是UNIX下面就用SHELL,下面演示一个LINUX下面用SHELL的调用,并把结果回显到控制台上,其它的应用程序类。
import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;public class RuntimeTest {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubProcess process;//String cmd = "ifconfig";//ok//String cmd = "sar -u 1 1| awk 'NR==4 {print $8}'";//空白。管道不支持String cmd = "/home/heyutao/workspace/ChunkOperator/sh/cpu.sh";//oktry {// 使用Runtime来执行command,生成Process对象Runtime runtime = Runtime.getRuntime();process = runtime.exec(cmd);// 取得命令结果的输出流InputStream is = process.getInputStream();// 用一个读输出流类去读InputStreamReader isr = new InputStreamReader(is);// 用缓冲器读行BufferedReader br = new BufferedReader(isr);String line = null;while ((line = br.readLine()) != null) {System.out.println(line);}is.close();isr.close();br.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
cpu.sh的内容:
#!/bin/sh#topcpu=$(sar -u 1 1| awk 'NR==4 {print $8}')ip=$(ifconfig | grep -E 'inet addr|inet 地址'| grep -v '127.0.0.1' | awk -F ':' '{print $2}' | awk '{print $1}')echo "cpu:$ip:$cpu"
执行结果如下:
cpu:59.64.158.126:80.68
Sun的doc里其实说明还有其他的用法:
exec(String[] cmdarray, String[] envp, File dir)
Executes the specified command and arguments in a separate process with the specified environment and working directory.
那个dir就是调用的程序的工作目录,这句其实还是很有用的。
Windows下调用程序
Process proc = Runtime . getRuntime () . exec ( " exefile " ) ;
Linux下调用程序就要改成下面的格式
Process proc = Runtime . getRuntime () . exec ( " ./exefile " ) ;
Windows下调用系统命令
String [] cmd = {" cmd " , " /C " , " copy exe1 exe2 " } ;
Process proc = Runtime . getRuntime () . exec ( cmd ) ;
Linux下调用系统命令就要改成下面的格式
String [] cmd = {" /bin/sh " , " -c " , " ln -s exe1 exe2 " } ;
Process proc = Runtime . getRuntime () . exec ( cmd ) ;
Windows下调用系统命令并弹出命令行窗口
String [] cmd = {" cmd " , " /C " , " start copy exe1 exe2 " } ;
Process proc = Runtime . getRuntime () . exec ( cmd ) ;
Linux下调用系统命令并弹出终端窗口就要改成下面的格式
String [] cmd = {" /bin/sh " , " -c " , " xterm -e ln -s exe1 exe2 " } ;
Process proc = Runtime . getRuntime () . exec ( cmd ) ;
还有要设置调用程序的工作目录就要
Process proc = Runtime . getRuntime () . exec ( " exeflie " , null , new File ( " workpath " )) ;
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