简单服务器开发（四）结合XML部署服务器端口号

package com.zda.httpserver.util;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 日期工具类
 * @author zda
 * @version 1.0
 * @since   1.0
 *
 */
public class DateUtil {
    private static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS");

    private DateUtil() {
    }
    /**
     * 获取系统当前时间
     * @return String [yyyy-MM-dd HH:mm:ss SSS]
     */
    public static String getCurrentTime() {
        return dateFormat.format(new Date());
    }
}

package com.zda.httpserver.util;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 日志记录器
 * @author zda
 * @version 1.0
 * @since   1.0
 *
 */
public class Logger {
    //工具类的方法往往是静态的，不需要创建对象
    //工具类的构造方法往往也是私有的，但不是必须的
    private Logger() {    
    }    
    
    /**
     * 普通日志记录器
     * @param msg
     */
    public static void log(String msg) {
        //输出到控制台
        System.out.println("[INFO]" + DateUtil.getCurrentTime() + msg);
        
    }
    
}

<!-- server.xml-->
<?xml version="1.0" encoding="UTF-8"?>
<server>
    <service>
        <connector port="8080"></connector>
    </service>
</server>

package com.zda.httpserver.core;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.*;

/**
 * 解析conf文件夹中的server.xml文件
 * @author zda
 * @version 1.0
 * @since   1.0
 *
 */
public class ServerParser {
    /**
     * 获取服务器的端口号
     * @return int port
     */
    public static int getPort() {
        //设置服务器默认端口号：8080
        int port = 8080;
        try {
            //创建解析器
            SAXReader saxReader = new SAXReader();
            //通过解析器的read方法将配置文件读取到内存中，生成一个Document[org.dom4j]对象树
            Document document = saxReader.read("conf/server.xml");
            //获取connector节点元素的路径：server -> service -> connector
            //获取connector节点元素的xpath路径：/server/service/connector
            //获取connector节点元素的xpath路径：server//connector
            //获取connector节点元素的xpath路径：//connector
            Element connectorElt = (Element) document.selectSingleNode("//connector");
            //获取port属性的值
            port = Integer.parseInt(connectorElt.attributeValue("port"));
            
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return port;
    }
}

package com.zda.httpserver.core;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

import com.zda.httpserver.util.Logger;

/**
 * httpserver主入口
 * @author zda
 * @version 1.0
 * @since   1.0
 *
 */
public class BootStrap {

    public static void main(String[] args) {
        // 程序入口
        start();
    }
    /**
     * 主程序入口
     */
    public static void start() {
        ServerSocket serverSocket = null;
        Socket clientSocket = null;
        BufferedReader br = null;
        try {
            Logger.log("httpserver start");
            //获取当前时间
            long start = System.currentTimeMillis();
            //获取系统端口号
            int port = ServerParser.getPort();
            Logger.log("httpserver-port: " + port);
            //创建服务器套接字，并且绑定端口号:8080
            serverSocket = new ServerSocket(port);
            //获取结束时间
            long end = System.currentTimeMillis();
            Logger.log("httpserver started: " + (end-start) + " ms");
            while(true){
                //开始监听网络，此时程序处于等待状态，等待接收客户端的消息
                clientSocket = serverSocket.accept();
                //接收客户端消息
                br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                String temp = null;
                while((temp = br.readLine()) != null){
                    System.out.println(temp);
                }
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            //关闭资源
            if(br != null){
                try {
                    br.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if(clientSocket != null){
                try {
                    clientSocket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if(serverSocket != null){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

}