基于java的linux线程监控

在阿里云上弄了个最小的云服务器，512m内存，建了个百度网盘资源站省淘网,tomcat有时会因内存占用过多，被系统回收，暂时没有太好的解决方法，就写了个小程序，监控tomcat线程，如果线程没了，就自动启动，代码如下：

package monitor;

import java.io.ByteArrayOutputStream;

import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.PumpStreamHandler;

public class Monitor {
	public static void main(String[] args) {
		try {
			while (true) {
				Thread.sleep(10000);
				String command = "ps -ef";
				ByteArrayOutputStream errorStream = new ByteArrayOutputStream();
				CommandLine commandline = CommandLine.parse(command);
				DefaultExecutor exec = new DefaultExecutor();
				exec.setExitValue(0);
				PumpStreamHandler streamHandler = new PumpStreamHandler(
						errorStream);
				exec.setStreamHandler(streamHandler);
				exec.execute(commandline);
				String result = errorStream.toString("UTF-8");
				if (result.indexOf("tomcat") < 0) {
					System.out.println("未找到进程，启动tomcat");
					command = "./startup.sh";
					commandline = CommandLine.parse(command);
					exec.execute(commandline);					
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

	}
}

需要依赖apache的commons-exec-1.2.jar包

当时对linux系统不熟，才写的这个，现在已经改为用linux crontab的方式了