Java下如何启动windows 的程序

Java的java.lang.Runtime类提供了运行 Windows下cmd环境的方法exec(String command)，所有在Windows cmd命令窗口下执行的程序，都能利用这个方法执行。

下边提供两个封装后的代码，一个是查看程序是否在运行，另一个是启动程序：

1、查看程序是否在运行：其中tasklist /FI "IMAGENAME eq processName.exe"是在Windows CMD命令下执行的命令

/**
* 判断某个进程是否在运行中
* @param processName
* @return
*/
public static boolean isRunning(String processName)
{

BufferedReader bufferedReader = null;
try
{
Process proc = Runtime.getRuntime().exec("tasklist /FI \"IMAGENAME eq "
+ processName
+ "\"");
bufferedReader = new BufferedReader(new InputStreamReader(proc.getInputStream()));
String line = null;
while ((line = bufferedReader.readLine()) != null)
{
if (line.contains(processName)) //判断是否存在
{
return true;
}
}
return false;
}
catch (Exception ex)
{
ex.printStackTrace();
return false;
}
finally
{
if (bufferedReader != null)
{
try
{
bufferedReader.close();
}
catch (Exception ex)
{
}
}
}
}

2、执行某个程序，comand例为：start "" "E:\\CardListen\\CardReaderServer.exe" "127.0.0.1" "8080"，详情可看CMD start命令

/**
* 执行Cmd命令
* @param command
* @return
* @throws IOException
*/
public static String executeCmd(String command) throws IOException {
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec("cmd /c " + command);
BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream(), "UTF-8"));
String line = null;
StringBuilder build = new StringBuilder();
while ((line = br.readLine()) != null) {
build.append(line);
}
return build.toString();
}