城市天气查询（Java网络、面向对象、多线程、IO）

package com.lovo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class WeatherServer {
	private static class ClientHandler implements Runnable {
		private Socket client;
	
		public ClientHandler(Socket client) {
			this.client = client;
		}
		
		@Override
		public void run() {
			try {
				InputStream in = client.getInputStream();
				BufferedReader br = new BufferedReader(new InputStreamReader(in));
				String cityName = br.readLine();
				WeatherInfo tempInfo = wInfo.get(cityName);
				if(tempInfo != null) {
					OutputStream out = client.getOutputStream();
					ObjectOutputStream oos = new ObjectOutputStream(out);
					oos.writeObject(tempInfo);
				}
			}
			catch(Exception e) {
				e.printStackTrace();
			}
			finally {
				if(client != null) {
					try {
						client.close();
					}
					catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
		}
		
	}
	
	private static ExecutorService service = Executors.newFixedThreadPool(10);
	
	private static Map<String,WeatherInfo> wInfo = new HashMap<String,WeatherInfo>();
	static {
		wInfo.put("北京", new WeatherInfo("雾", 0, 10, 25, 450));
		wInfo.put("上海", new WeatherInfo("阴", 12, 15, 40, 360));
		wInfo.put("广州", new WeatherInfo("晴", 25, 30, 100, 150));
	}

	public static void main(String[] args) {
		ServerSocket server = null;
		try {
			server = new ServerSocket(9527);
			while(true) {
				Socket socket = server.accept();	// 连接成功后剩下的都是IO操作
				service.execute(new ClientHandler(socket));
			}
		}
		catch(Exception e) {
			e.printStackTrace();
		}
		finally {
			if(server != null) {
				try {
					server.close();
					service.shutdown();
				}
				catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}
}

package com.lovo.practise;

public class WeatherInfo {
	private String status;	// 天气情况
	private int lowerTem;	// 最低温度
	private int upperTem;	// 最高温度
	private int hum;		// 湿度
	private int pm;		// PM值（particulate matter）
	public WeatherInfo(String status, int lowerTem, int upperTem, int hum,
			int pm) {
		this.status = status;
		this.lowerTem = lowerTem;
		this.upperTem = upperTem;
		this.hum = hum;
		this.pm = pm;
	}
	@Override
	public String toString() {
		String str =  status + "\r\n" + "温度： " + lowerTem + "-"
				+ upperTem + "℃\r\n" + "湿度： " + hum + "%\r\n" + "空气质量： ";
		if(pm <= 35) {
			str += "优";
		}
		else if(pm <= 75) {
			str += "良";
		}
		else if(pm <= 150) {
			str += "中度污染";
		}
		else {
			str += "重度污染";
		}
		
		return str;
	}
				
	
}

package com.lovo;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.Socket;
import java.util.Scanner;

public class WeatherClient {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		Socket client = null;
		try {
			client = new Socket("192.168.1.108", 9527);	
			System.out.print("请输入要查询的城市: ");
			String cityName = sc.nextLine().trim();
			OutputStream out = client.getOutputStream();
			PrintStream ps = new PrintStream(out);
			ps.println(cityName);
			InputStream in = client.getInputStream();
			ObjectInputStream ois = new ObjectInputStream(in);
			WeatherInfo tempInfo = (WeatherInfo) ois.readObject();
			if(tempInfo != null) {
				System.out.println(tempInfo);
			}
		}
		catch(Exception e) {
			System.out.println("没有该城市的数据");
		}
		finally {
			if(client != null) {
				try {
					client.close();
				}
				catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		sc.close();
	}
}