JAVA监测tomcat是否宕机，控制重启_java监控后端包是否重启成功-优快云博客

本文链接：https://blog.youkuaiyun.com/metar_he/article/details/108367021

本文介绍了一种使用Java实现的Tomcat状态监测方法，通过检查HTTP响应和进程是否存在来判断Tomcat是否正常运行。如果发现Tomcat未响应或已停止，将自动执行重启操作，确保服务的连续性。

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//判断tomcat是否宕机，如果宕机，则进行重启。java实现。 import java.net.URL;
import java.net.URLConnection;
import java.util.Date;

public class Detector {

    private static void keepTomcatAlive() throws NullPointerException {
        String s;
        String t = new String("tomcat6");
        boolean isTomcatAlive = false;
        java.io.BufferedReader in;

        System.setProperty("sun.net.client.defaultConnectTimeout", "8000");
        System.setProperty("sun.net.client.defaultReadTimeout", "10000");

        try {
            URL url = new URL("http://localhost:8080/test.jsp");             URLConnection con = url.openConnection();
            in = new java.io.BufferedReader(new java.io.InputStreamReader(
                    con.getInputStream()));
            con.setConnectTimeout(1000);
            con.setReadTimeout(4000);
            while ((s = in.readLine()) != null) {
                if (s.length() > 0) {
                    // accessed page successful.                     return;
                }
            }
            in.close();
        } catch (Exception ex) {
            // ex.printStackTrace();         }

        try {
            java.lang.Process p = java.lang.Runtime.getRuntime()
                    .exec("ps -aux");
            in = new java.io.BufferedReader(new java.io.InputStreamReader(
                    p.getInputStream()));
            while ((s = in.readLine()) != null) {
                if (s.startsWith(t)) {
                    isTomcatAlive = true;
                    break;
                }
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (isTomcatAlive) {
            System.out.println("<" + new Date()
                    + "> Tomcat is alive but not response!");
            stopTomcat();
        }
        startTomcat();
    }

    public static void stopTomcat() {
        try {
            java.lang.Process p = java.lang.Runtime.getRuntime().exec(
                    "/etc/init.d/tomcat6 stop");
            java.io.BufferedReader in = new java.io.BufferedReader(
                    new java.io.InputStreamReader(p.getInputStream()));
            String s;
            String t = "Stopping";
            boolean restart = false;
            while ((s = in.readLine()) != null) {
                if (s.indexOf(t) != -1) {
                    restart = true;
                    break;
                }
            }
            System.out.println("<" + new Date() + "> Tomcat is stop "
                    + (restart ? "OK" : "ERROR"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void startTomcat() {
        try {
            java.lang.Process p = java.lang.Runtime.getRuntime().exec(
                    "/etc/init.d/tomcat6 start");
            java.io.BufferedReader in = new java.io.BufferedReader(
                    new java.io.InputStreamReader(p.getInputStream()));
            String s;
            String t = "Starting";
            boolean restart = false;
            while ((s = in.readLine()) != null) {
                if (s.indexOf(t) != -1) {
                    restart = true;
                    break;
                }
            }
            System.out.println("<" + new Date() + "> Tomcat is start "
                    + (restart ? "OK" : "ERROR"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void debug(String msg) {
        System.out.println("Debug::: " + msg);
    }

    public static void main(String[] args) {
        while (true) {
            try {
                debug("Detect agin <" + new Date() + ">");
                Detector.keepTomcatAlive();
                debug("Sleep...");
                Thread.sleep(30000);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

}