commons-exec执行系统命令

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有些场景下需要在java中执行Bat命令或者Shell命令，如使用wkhtmltopdf生成pdf报表等，这时可以借助apache的commons-exec，指定ExecuteWatchdog 可以完整控制整个执行声明周期，不会产生失控进程。

<dependency>            <groupId>org.apache.commons</groupId>            <artifactId>commons-exec</artifactId>            <version>1.3</version>        </dependency>

/**     * 执行不需要返回结果的命令     * @throws Exception     */     public void execCmdWithoutResult() throws Exception{         //开启windows telnet: net start telnet         //注意：第一个空格之后的所有参数都为参数        CommandLine cmdLine = new CommandLine("net");        cmdLine.addArgument("start");        cmdLine.addArgument("telnet");        DefaultExecutor executor = new DefaultExecutor();        executor.setExitValue(1);        //设置60秒超时，执行超过60秒后会直接终止        ExecuteWatchdog watchdog = new ExecuteWatchdog(60 * 1000);        executor.setWatchdog(watchdog);        DefaultExecuteResultHandler handler = new DefaultExecuteResultHandler();        executor.execute(cmdLine, handler);        //命令执行返回前一直阻塞        handler.waitFor();    }    /**     * 带返回结果的命令执行     * @return     */    private String execCmdWithResult() {        try {            String command = "ping 192.168.1.10";            //接收正常结果流            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();            //接收异常结果流            ByteArrayOutputStream errorStream = new ByteArrayOutputStream();            CommandLine commandline = CommandLine.parse(command);            DefaultExecutor exec = new DefaultExecutor();            exec.setExitValues(null);            //设置一分钟超时            ExecuteWatchdog watchdog = new ExecuteWatchdog(60*1000);            exec.setWatchdog(watchdog);            PumpStreamHandler streamHandler = new PumpStreamHandler(outputStream,errorStream);            exec.setStreamHandler(streamHandler);            exec.execute(commandline);            //不同操作系统注意编码，否则结果乱码            String out = outputStream.toString("GBK");            String error = errorStream.toString("GBK");            return out+error;        } catch (Exception e) {            e.printStackTrace();            return e.getMessage();        }    }

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