java编写service详细笔记

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... ");    
   //    Server server = new Server();    
   //    server.init();    
   //}    
   
   public void init() {  
System.out.println("服务器启动... "); 
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: ");    
// 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