[ Java代碼範本 ] 利用 Java 執行 Console 下的命令

Sample Code: 
This sample will execute the App:NICConfig.exe under Disk D. (陽春版) 

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1. package gays.runtime;  
2.   
3. import java.io.BufferedReader;  
4. import java.io.IOException;  
5. import java.io.InputStreamReader;  
6.   
7. public class CallingCMD_Sample {  
8.       
9.       
10.     public static void main(String args[]){  
11.         StringBuffer commandLine = new StringBuffer("D:\\NICConfig.exe \"LocalNetwork\" STATUS");  
12.         //StringBuffer commandLine = new StringBuffer("cmd");  
13.         try{  
14.             Runtime rt = Runtime.getRuntime();  
15.             Process p = rt.exec(commandLine.toString());      
16.             BufferedReader input = new BufferedReader(new InputStreamReader(p  
17.                     .getInputStream()));  
18.             String line=null;  
19.             while ((line = input.readLine()) != null) {  
20.                 System.out.println(line);  
21.             }  
22.             input.close();            
23.             System.out.print("========================================================================");  
24.         }catch(IOException ioe){  
25.             ioe.printStackTrace();  
26.         }  
27.           
28.     }  
29.   
30. }  

但其實上面程式在執行後, 如果有錯誤輸出到 Stderr 就會 hang 住, 主要是因為沒有對 Stderr 的輸出進行處理, 因此上面代碼可以改良成使用兩支 Thread 分別來處理 std 與 stderr 的輸出 : 
- _StreamGobbler.java 代碼 : 使用來處理 Stderr/ Std 的輸出 

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1. /* 
2. * To change this template, choose Tools | Templates 
3. * and open the template in the editor. 
4. */  
5. package flib.util.inner;  
6.   
7. import flib.util.inner.enums.EStreamType;  
8. import java.io.*;  
9.   
10. /** 
11. * 
12. * @author John-Lee 
13. */  
14. public class _StreamGobbler extends Thread {  
15.   
16.     InputStream is;  
17.     EStreamType type;   
18.     private boolean isShow = true;  
19.   
20.     public _StreamGobbler(InputStream is, EStreamType type) {  
21.         this.is = is;  
22.         this.type = type;  
23.     }  
24.   
25.     public _StreamGobbler(InputStream is, EStreamType type, boolean isShow) {  
26.         this(is, type);  
27.         this.isShow = isShow;  
28.     }  
29.   
30.     public void run() {  
31.         try {  
32.             InputStreamReader isr = new InputStreamReader(is);  
33.             BufferedReader br = new BufferedReader(isr);  
34.             String line = null;  
35.             while ((line = br.readLine()) != null) {  
36.                 if(isShow) {  
37.                     System.out.println(type.toString() + ">" + line);  
38.                 }  
39.                 System.out.flush();  
40.             }  
41.         } catch (IOException ioe) {  
42.             ioe.printStackTrace();  
43.         }  
44.     }  
45.   
46.     /** 
47.      * @return the isShow 
48.      */  
49.     public boolean isIsShow() {  
50.         return isShow;  
51.     }  
52.   
53.     /** 
54.      * @param isShow the isShow to set 
55.      */  
56.     public void setIsShow(boolean isShow) {  
57.         this.isShow = isShow;  
58.     }          
59. }  

- EStreamType.java 代碼 : 

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1. /* 
2. * To change this template, choose Tools | Templates 
3. * and open the template in the editor. 
4. */  
5.   
6. package flib.util.inner.enums;  
7.   
8. /** 
9. * 
10. * @author John-Lee 
11. */  
12. public enum EStreamType {  
13.     OUTPUT("STDOUT"),ERROR("STDERR");  
14.     private String msg;  
15.     private EStreamType(String m) {  
16.         msg = m;  
17.     }  
18.     public String toString() {  
19.         return msg;  
20.     }  
21.     public String getMsg() {  
22.         return msg;  
23.     }  
24. }  

- Test3.java 代碼 : 測試 Main 類 

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1. package ts.test;  
2.   
3. import java.io.BufferedReader;  
4. import java.io.IOException;  
5.   
6. public class Test3 {  
7.     public static void main(String args[]) {  
8.         try {  
9.             String cmdline = "ipconfig";  
10.             boolean isShow = true;  
11.             StringBuffer res = new StringBuffer("");  
12.             Runtime runtime = Runtime.getRuntime();  
13.             Process process = null;              
14.             BufferedReader sb = null;  
15.             process = runtime.exec(cmdline);  
16.   
17.             // any error message?  
18.             _StreamGobbler errorGobbler = new _StreamGobbler(process.getErrorStream(), EStreamType.ERROR, isShow);  
19.             // any output?  
20.             _StreamGobbler outputGobbler = new _StreamGobbler(process.getInputStream(), EStreamType.OUTPUT, isShow);  
21.   
22.             // kick them off  
23.             errorGobbler.start();  
24.             outputGobbler.start();  
25.             process.getOutputStream().flush();  
26.             process.getOutputStream().close();  
27.             int exitCode = process.waitFor();  
28.             //System.out.println("ExitValue: " + exitVal);  
29.         } catch (InterruptedException e) {  
30.             e.printStackTrace();  
31.         } catch (IOException ioe) {  
32.             ioe.printStackTrace();  
33.         }  
34.     }  
35. }  

補充說明 : 
* java 調用 Windows 下 DOS 命令 wmic 奇怪現象 
* Java編程 - WMIC的和Java