package com.httpserver.two;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;

/**
 * @description: 使用socket 实现 web服务器 --- 具体执行读写操作的。
 * @version:v1.0
 * @author:w
 * @date:2018年6月6日上午11:06:20
 *
 */
public class HttpServer extends Thread {
	/**
	 * web资源根路径
	 */
	public static final String ROOT = "c:/";
	
	/**
	 * 输入流对象,读取浏览器请求
	 */
	private InputStream input;
	
	/**
	 * 输出流对象,响应内容给浏览器
	 */
	private OutputStream out;

	/**
	 * @description:初始化socket对象,获取对应 输入,输出流
	 * @param socket
	 */
	public HttpServer(Socket socket) {
		try {
			input = socket.getInputStream();
			out = socket.getOutputStream();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 多线程方法调用
	 */
	@Override
	public void run() {
		String filePath = read();
		response(filePath);
	}

	/**
	 * @description: 读取资源文件,响应给浏览器。
	 * @param:@param filePath
	 * 资源文件路径
	 * @return:void
	 * @version:v1.0
	 * @author:w
	 * @date:2018年6月6日 上午11:42:37
	 *
	 */
	private void response(String filePath) {
		File file = new File(ROOT + filePath);
		if (file.exists()) {
			// 1、资源存在,读取资源
			try {
				BufferedReader reader = new BufferedReader(new FileReader(file));
				StringBuffer sb = new StringBuffer();
				String line = null;
				while ((line = reader.readLine()) != null) {
					sb.append(line).append("\r\n");
				}
				StringBuffer result = new StringBuffer();
				result.append("HTTP /1.1 200 ok /r/n");
			//	result.append("Content-Type:text/html /r/n");
				result.append("Content-Length:" + file.length() + "/r/n");
				result.append("\r\n:" + sb.toString());
				out.write(result.toString().getBytes());
				out.flush();
				out.close();
			} catch (Exception e) {
				e.printStackTrace();
			}

		} else {
			// 2、资源不存在,提示 file not found
			StringBuffer error = new StringBuffer();
			error.append("HTTP /1.1 400 file not found /r/n");
			error.append("Content-Type:text/html \r\n");
			error.append("Content-Length:20 \r\n").append("\r\n");
			error.append("<h1 >File Not Found..</h1>");
			try {
				out.write(error.toString().getBytes());
				out.flush();
				out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

	/**
	 * 
	 * @description:解析资源文件路径
	 * @example: GET /index.html HTTP/1.1
	 * @param:@return
	 * @return:String
	 * @version:v1.0
	 * @author:w
	 * @date:2018年6月6日 上午11:39:42
	 *
	 */
	private String read() {
		BufferedReader reader = new BufferedReader(new InputStreamReader(input));
		try {
			// 读取请求头, 如:GET /index.html HTTP/1.1
			String readLine = reader.readLine();
			String[] split = readLine.split(" ");
			if (split.length != 3) {
				return null;
			}
			System.out.println(readLine);
			return split[1];
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

}