利用Runtime.execute方法，我們可以在Java程序中運行Linux的Shell腳本，或者執行其他程序。參考了互聯網上的這篇文章，我重新整理了代碼。

現在通過CommandHelper.execute方法可以執行命令，該類實現代碼如下：

package javaapplication3;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

/**

*

* @author chenshu

*/

public class CommandHelper {

//default time out, in millseconds

public static int DEFAULT_TIMEOUT;

public static final int DEFAULT_INTERVAL = 1000;

public static long START;

public static CommandResult exec(String command) throws IOException, InterruptedException {

Process process = Runtime.getRuntime().exec(command);

CommandResult commandResult = wait(process);

if (process != null) {

process.destroy();

}

return commandResult;

}

private static boolean isOverTime() {

return System.currentTimeMillis() - START >= DEFAULT_TIMEOUT;

}

private static CommandResult wait(Process process) throws InterruptedException, IOException {

BufferedReader errorStreamReader = null;

BufferedReader inputStreamReader = null;

try {

errorStreamReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));

inputStreamReader = new BufferedReader(new InputStreamReader(process.getInputStream()));

//timeout control

START = System.currentTimeMillis();

boolean isFinished = false;

for (;;) {

if (isOverTime()) {

CommandResult result = new CommandResult();

result.setExitValue(CommandResult.EXIT_VALUE_TIMEOUT);

result.setOutput("Command process timeout");

return result;

}

if (isFinished) {

CommandResult result = new CommandResult();

result.setExitValue(process.waitFor());

//parse error info

if (errorStreamReader.ready()) {

StringBuilder buffer = new StringBuilder();

String line;

while ((line = errorStreamReader.readLine()) != null) {

buffer.append(line);

}

result.setError(buffer.toString());

}

//parse info

if (inputStreamReader.ready()) {

StringBuilder buffer = new StringBuilder();

String line;

while ((line = inputStreamReader.readLine()) != null) {

buffer.append(line);

}

result.setOutput(buffer.toString());

}

return result;

}

try {

isFinished = true;

process.exitValue();

} catch (IllegalThreadStateException e) {

// process hasn't finished yet

isFinished = false;

Thread.sleep(DEFAULT_INTERVAL);

}

}

} finally {

if (errorStreamReader != null) {

try {

errorStreamReader.close();

} catch (IOException e) {

}

}

if (inputStreamReader != null) {

try {

inputStreamReader.close();

} catch (IOException e) {

}

}

}

}

}

CommandHelper類使用了CommandResult對象輸出結果錯誤信息。

總結

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