java编写service详细笔记 - centos7.2实战笔记(windows类似就不在重复了)

java编写service详细笔记 - centos7.2实战笔记(windows类似就不在重复了)

目标效果(命令行启动服务)：

service xxxxd start #启动服务

service xxxxd stop #停止服务

详细步骤

一、编译并安装jsvc

官网 https://commons.apache.org/daemon/
1)建立目录

cd /

mkdir jsvc

2)下载jsvc源码

wget https://mirrors.tuna.tsinghua.edu.cn/apache//commons/daemon/source/commons-daemon-1.0.15-src.tar.gz
3)解压源码

tar zxvf commons-daemon-1.0.15-src.tar.gz

4)编译源码

编译器为了省事，先给目录下所有文件设置可执行权限

chmod -R 777 *

cd /jsvc/commons-daemon-1.0.15-src/src/native/unix

./support/buildconf.sh

./configure --with-java=/opt/jdk #注 /opt/jdk 是我的java安装目录

make #编译

5)编译后

会在 /jsvc/commons-daemon-1.0.15-src/src/native/unix 生成 可执行文件jsvc

设置一下执行权限

chmod 777 /jsvc/commons-daemon-1.0.15-src/src/native/unix/jsvc

二、实战编写一个小小的javasocket服务,代码如下：

1)test_service.java

========================================================================

package com.xiaobaijiuxing.jsvc;

import org.apache.commons.daemon.Daemon;

import org.apache.commons.daemon.DaemonContext;

import org.apache.commons.daemon.DaemonInitException;

/**

* @date 2017-5-2

* @author 小白救星

*/

public class test_service implements Daemon {

public static boolean isstop = false;

public static void main(String args[]) {

System.out.println("Hello World2!");

}

/* (non-Javadoc)

* @see org.apache.commons.daemon.Daemon#destroy()

*/

@Override

public void destroy() {

// TODO Auto-generated method stub

System.out.println("JsvcTest destory method...");

}

/* (non-Javadoc)

* @see org.apache.commons.daemon.Daemon#init(org.apache.commons.daemon.DaemonContext)

*/

@Override

public void init(DaemonContext ctx) throws DaemonInitException, Exception {

// TODO Auto-generated method stub

System.out.println("JsvcTest init method..." + ctx.toString());

}

/* (non-Javadoc)

* @see org.apache.commons.daemon.Daemon#start()

*/

@Override

public void start() throws Exception {

// TODO Auto-generated method stub

int i =0;

//while (!isstop)

//{

Server server = new Server();

server.init();

System.out.println("JsvcTest start method..." + i);

i = i +1;

//}

}

/* (non-Javadoc)

* @see org.apache.commons.daemon.Daemon#stop()

*/

@Override

public void stop() throws Exception {

// TODO Auto-generated method stub

isstop = true;

System.out.println("JsvcTest stop method...");

}

}

========================================================================

2)Server.java

========================================================================

package com.xiaobaijiuxing.jsvc;

import java.io.BufferedReader;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.InputStreamReader;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

public static final int PORT = 12345;//监听的端口号

//public static void main(String[] args) {

// System.out.println("服务器启动...\n");

// Server server = new Server();

// server.init();

//}

public void init() {

System.out.println("服务器启动...\n");

try {

ServerSocket serverSocket = new ServerSocket(PORT);

//while (true) {

// 一旦有堵塞, 则表示服务器与客户端获得了连接

Socket client = serverSocket.accept();

// 处理这次连接

new HandlerThread(client);

//}

} catch (Exception e) {

System.out.println("服务器异常: " + e.getMessage());

}

}

private class HandlerThread implements Runnable {

private Socket socket;

public HandlerThread(Socket client) {

socket = client;

new Thread(this).start();

}

public void run() {

try {

// 读取客户端数据

DataInputStream input = new DataInputStream(socket.getInputStream());

String clientInputStr = input.readUTF();//这里要注意和客户端输出流的写方法对应,否则会抛 EOFException

// 处理客户端数据

System.out.println("客户端发过来的内容:" + clientInputStr);

// 向客户端回复信息

DataOutputStream out = new DataOutputStream(socket.getOutputStream());

System.out.print("请输入:\t");

// 发送键盘输入的一行

String s = new BufferedReader(new InputStreamReader(System.in)).readLine();

out.writeUTF(s);

out.close();

input.close();

} catch (Exception e) {

System.out.println("服务器 run 异常: " + e.getMessage());

} finally {

if (socket != null) {

try {

socket.close();

} catch (Exception e) {

socket = null;

System.out.println("服务端 finally 异常:" + e.getMessage());

}

}

}

}

}

}

========================================================================

三、将我们的java代码打包到test_service.jar

我采用ant打包，因为我感觉ant最简单，写代码只要用好了EditPlus+ant就可以，不需要其它开发工具

1)ant编译配置文件build.xml

========================================================================

<?xml version="1.0" encoding="UTF-8" ?>

<project name="test_service" default="run" basedir=".">

<property name="src" value="src"/>

<property name="dest" value="classes"/>

<property name="doc.dir" value="doc"/>

<property name="test_services_jar" value="test_service.jar"/>

<property name="main.class" value="com.xiaobaijiuxing.jsvc.test_service"/>

<path id="lib_classpath">

<fileset dir="lib/">

<include name="*.jar"/>

</fileset>

</path>

<target name="init">

<mkdir dir="${dest}"/>

</target>

<target name="compile" depends="init">

<javac encoding="utf-8" srcdir="${src}" destdir="${dest}" includeantruntime="on">

<classpath refid="lib_classpath"/>

</javac>

</target>

<target name="build" depends="compile">

<jar encoding="utf-8" jarfile="${test_services_jar}" basedir="${dest}">

<manifest>

<!--<attribute name="Main-Class" value="${main.class}"/>-->

<attribute name="Class-Path" value="lib/commons-daemon-1.0.15.jar"/>

</manifest>

</jar>

</target>

<target name="run" depends="clean,build">

</target>

<target name="clean">

<delete dir="${dest}" />

<delete file="test_services_jar" />

</target>

<target name="rerun" depends="clean,run">

<ant target="clean" />

<ant target="run" />

</target>

<target name="createdoc">

<delete dir="${doc.dir}" />

<mkdir dir="${doc.dir}"/>

<javadoc destdir="${doc.dir}" encoding="UTF-8" docencoding="UTF-8">

<packageset dir="${src}">

<include name="**"/>

</packageset>

</javadoc>

</target>

</project>

========================================================================

2)编译生成test_service.jar包

命令行运行 ant回车即可

3)建立目录

mkdir /jsvc/commons-daemon-1.0.15-src/app

mkdir /jsvc/commons-daemon-1.0.15-src/log

mkdir /jsvc/commons-daemon-1.0.15-src/tmp

chmod -R 777 *

4)将编译出来的jar包及要用到的lib目录拷贝到 /jsvc/commons-daemon-1.0.15-src/app 目录下

app目录下是 test_service.jar

app/lib目录下是 commons-daemon-1.0.15.jar

四、编写linux centos7.2 service 脚本并运行

1)cd /etc/init.d/

2)vi testserviced #内容如下

========================================================================

#!/bin/sh

RETVAL=0

prog="jsvc"

JAVA_HOME=/opt/jdk

APP_HOME=/jsvc/commons-daemon-1.0.15-src/app

#jsvc所在的目录

DAEMON_HOME=/jsvc/commons-daemon-1.0.15-src/src/native/unix

APP_USER=root

TMP_DIR=/jsvc/commons-daemon-1.0.15-src/app/tmp

PID=/jsvc/commons-daemon-1.0.15-src/app/testserviced.pid

CLASSPATH=/jsvc/commons-daemon-1.0.15-src/app/test_service.jar:/jsvc/commons-daemon-1.0.15-src/app/lib/commons-daemon-1.0.15.jar

case "$1" in

start)

#echo $DAEMON_HOME

# Start Serivce

$DAEMON_HOME/jsvc -user $APP_USER -home $JAVA_HOME -Djava.io.tmpdir=$TMP_DIR -wait 5000 -pidfile $PID -outfile $APP_HOME/log/jsvc.out -errfile '&1' -cp $CLASSPATH com.jason.jsvc.test_service &

# To get a verbose JVM

#-verbose \

# To get a debug of jsvc.

#-debug \

exit $?

;;

stop)

#

# Stop Serivce

#

#$DAEMON_HOME/jsvc -stop -pidfile $PID com.jason.jsvc.test_service

exit $?

;;

*)

echo "Usage service testserviced start/stop"

exit 1;;

esac

:wq #保存

========================================================================

3)添加centos系统服务

chmod 777 /etc/init.d/testserviced

chkconfig --add testserviced

4)启动和关闭服务

service testserviced start

查看我们服务启动后的socket服务端口是否启动了监听

lsof -i:12345

返回结果：

[root@xiaobaijiuxing ~]# lsof -i:12345

[root@xiaobaijiuxing ~]# service testserviced start

[root@xiaobaijiuxing ~]# lsof -i:12345

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME

jsvc 171926 root 9u IPv6 5672748 0t0 TCP *:italk (LISTEN)

service testserviced stop

五、大功告成

作者：小白救星 原创，未经许可可以随意转发