process+bufferedReader 检测进程是否存在

[mouzeming]

private static boolean findProcess(String processName) {
		// 声明一个bufferedReader对象
		BufferedReader bufferedReader = null;
		try {
			Process proc = Runtime.getRuntime().exec(
					"tasklist /FI \"IMAGENAME eq " + processName + "\"");
			System.out.println(proc.getInputStream().toString());
			bufferedReader = new BufferedReader(new InputStreamReader(proc
					.getInputStream()));
			System.out.println(bufferedReader.readLine());
			String line = null;
			while ((line = bufferedReader.readLine()) != null) {
				if (line.contains(processName)) {
					return true;
				}
			}
			return false;
		} catch (Exception e) {
			e.printStackTrace();
			return false;
		} finally {
			try {
				if (bufferedReader != null) {
					bufferedReader.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}

		}
	}

在网上找了一段检测进程是否存在的代码
测试发现bufferedRead.readLine为空..因为没使用过process..
不知道哪里出错..
我要检测的进程为mencoder.exe
请高手解答