如何用java執(zhí)行命令行

Java運(yùn)行命令行并獲取返回值，下面以簡單的Java執(zhí)行ping命令（ping 127.0.0.1 -t

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）為例，代碼如下：

Process?p?=?Runtime.getRuntime().exec("ping?127.0.0.1?-t");

Process?p?=?Runtime.getRuntime().exec("javac");

InputStream?is?=?p.getInputStream();

BufferedReader?reader?=?new?BufferedReader(new?InputStreamReader(is));

String?line;

while((line?=?reader.readLine())!=?null){

System.out.println(line);

}

p.waitFor();

is.close();

reader.close();

p.destroy();

}

java代碼怎么實(shí)現(xiàn)執(zhí)行dos運(yùn)行命令

使用Runtime類，他是一個與JVM運(yùn)行時環(huán)境有關(guān)的類，這個類是Singleton的。Runtime.getRuntime()可以取得當(dāng)前JVM的運(yùn)行時環(huán)境，這也是在Java中唯一一個得到運(yùn)行時環(huán)境的方法。Runtime.exec()方法就是執(zhí)行cmd命令的方法。

舉例

import?java.io.BufferedReader;

import?java.io.IOException;

import?java.io.InputStreamReader;

import?java.util.ArrayList;

import?java.util.HashMap;

public?class?Test?{

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

excuteCommand("ipconfig");

excuteCommand("ping?10.141.26.50");

}

public?static?void??excuteCommand(String?command)

{

Runtime?r?=?Runtime.getRuntime();

Process?p;

try?{

p?=?r.exec(command);

BufferedReader?br?=?new?BufferedReader(new?InputStreamReader(p

.getInputStream()));

String?inline;

while?((inline?=?br.readLine())?!=?null)?{

System.out.println(inline);

}

br.close();

}?catch?(IOException?e)?{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

}

}

}

如何用java啟動windows命令行程序

先請編譯和運(yùn)行下面程序：

import java.util.*;

import java.io.*;

public class BadExecJavac2

{

public static void main(String args[])

{

try

{

Runtime rt = Runtime.getRuntime();

Process proc = rt.exec("javac");

int exitVal = proc.waitFor();

System.out.println("Process exitValue: " + exitVal);

} catch (Throwable t){

t.printStackTrace();

}

}

}

我們知道javac命令，當(dāng)不帶參數(shù)運(yùn)行javac

程序時，它將輸出幫助說明，為什么上面程序不產(chǎn)生任何輸出并掛起，永不完成呢？java文檔上說,由于有些本地平臺為標(biāo)準(zhǔn)輸入和輸出流所提供的緩沖區(qū)大小

有限,如果不能及時寫入子進(jìn)程的輸入流或者讀取子進(jìn)程的輸出流,可能導(dǎo)致子進(jìn)程阻塞,甚至陷入死鎖。所以，上面的程序應(yīng)改寫為：

import java.util.*;

import java.io.*;

public class MediocreExecJavac

{

public static void main(String args[])

{

try

{

Runtime rt = Runtime.getRuntime();

Process proc = rt.exec("javac");

InputStream stderr = proc.getErrorStream();

InputStreamReader isr = new InputStreamReader(stderr);

BufferedReader br = new BufferedReader(isr);

String line = null;

System.out.println("");

while ( (line = br.readLine()) != null)

System.out.println(line);

System.out.println("");

int exitVal = proc.waitFor();

System.out.println("Process exitValue: " + exitVal);

} catch (Throwable t){

t.printStackTrace();

}

}

}

下面是正確的輸出：

D:\javajava MediocreExecJavac

Usage: javac options

where possible options include:

-g Generate all debugging info

-g:none Generate no debugging info

-g:{lines,vars,source} Generate only some debugging info

-nowarn Generate no warnings

-verbose Output messages about what the compiler is doing

-deprecation Output source locations where deprecated APIs are used

-classpath Specify where to find user class files

-cp Specify where to find user class files

-sourcepath Specify where to find input source files

-bootclasspath Override location of bootstrap class files

-extdirs Override location of installed extensions

-endorseddirs Override location of endorsed standards path

-d Specify where to place generated class files

-encoding Specify character encoding used by source files

-source Provide source compatibility with specified release

-target Generate class files for specific VM version

-version Version information

-help Print a synopsis of standard options

-X Print a synopsis of nonstandard options

-J Pass directly to the runtime system

Process exitValue: 2

D:\java

下面是一個更一般的程序，它用兩個線程同步清空標(biāo)準(zhǔn)錯誤流和標(biāo)準(zhǔn)輸出流，并能根據(jù)你所使用的windows操作系統(tǒng)選擇windows命令解釋器command.com或cmd.exe,然后執(zhí)行你提供的命令。

import java.util.*;

import java.io.*;

class StreamGobbler extends Thread

{

InputStream is;

String type; //輸出流的類型ERROR或OUTPUT

StreamGobbler(InputStream is, String type)

{

this.is = is;

this.type = type;

}

public void run()

{

try

{

InputStreamReader isr = new InputStreamReader(is);

BufferedReader br = new BufferedReader(isr);

String line=null;

while ( (line = br.readLine()) != null)

{

System.out.println(type + "" + line);

System.out.flush();

}

} catch (IOException ioe)

{

ioe.printStackTrace();

}

}

}

public class GoodWindowsExec

{

public static void main(String args[])

{

if (args.length 1)

{

System.out.println("USAGE: java GoodWindowsExec ");

System.exit(1);

}

try

{

String osName = System.getProperty("os.name" );

System.out.println("osName: " + osName);

String[] cmd = new String[3];

if(osName.equals("Windows XP") ||osName.equals("Windows 2000"))

{

cmd[0] = "cmd.exe" ;

cmd[1] = "/C" ;

cmd[2] = args[0];

}

else if( osName.equals( "Windows 98" ) )

{

cmd[0] = "command.com" ;

cmd[1] = "/C" ;

cmd[2] = args[0];

}

Runtime rt = Runtime.getRuntime();

System.out.println("Execing " + cmd[0] + " " + cmd[1]+ " " + cmd[2]);

Process proc = rt.exec(cmd);

// any error message?

StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");

// any output?

StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT");

// kick them off

errorGobbler.start();

outputGobbler.start();

// any error???

int exitVal = proc.waitFor();

System.out.println("ExitValue: " + exitVal);

} catch (Throwable t){

t.printStackTrace();

}

}

}

下面是一個測試結(jié)果：

D:\javajava GoodWindowsExec "copy Test.java Test1.java"

osName: Windows XP

Execing cmd.exe /C copy Test.java Test1.java

OUTPUT已復(fù)制 1 個文件。

ExitValue: 0

D:\java

下面的測試都能通過(windows xp+jdk1.5)

D:\javajava GoodWindowsExec dir

D:\javajava GoodWindowsExec Test.java

D:\javajava GoodWindowsExec regedit.exe

D:\javajava GoodWindowsExec NOTEPAD.EXE

D:\javajava GoodWindowsExec first.ppt

D:\javajava GoodWindowsExec second.doc

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