java基于Socket实现的一个简单的HTTP服务器

落日映苍穹つ 2022-05-17 12:54 193阅读 0赞

package com.zg.kyrie;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.PrintWriter;
    import java.net.ServerSocket;
    import java.net.Socket;
    
    public class HttpTest {
        public static void main(String[] args) throws IOException{
            ServerSocket serverSocket = new ServerSocket(8888);
            while (true) {//一直监听，直到受到停止的命令
                Socket socket = null;
                try {
                    socket = serverSocket.accept();//如果没有请求，会一直hold在这里等待，有客户端请求的时候才会继续往下执行
                    // log
                    BufferedReader bufferedReader = new BufferedReader(
                            new InputStreamReader(socket.getInputStream()));//获取输入流(请求)
                    StringBuilder stringBuilder = new StringBuilder();
                    String line = null;
                    while ((line = bufferedReader.readLine()) != null
                            && !line.equals("")) {//得到请求的内容，注意这里作两个判断非空和""都要，只判断null会有问题
                        stringBuilder.append(line).append("<br>");
                    }
                    String result = stringBuilder.toString();
                    System.out.println(result);
                    // echo
                    PrintWriter printWriter = new PrintWriter(
                            socket.getOutputStream(), true);//这里第二个参数表示自动刷新缓存
                    printWriter.println("HTTP/1.1 200 OK");
                    printWriter.println("Content-Type:text/html;charset=utf-8");
                    printWriter.println();
    
                    printWriter.println("<h5>你刚才发送的请求数据是：<br>");
                    printWriter.write(result);//将日志输出到浏览器
                    printWriter.println("</h5>");
                    // release
                    printWriter.close();
                    bufferedReader.close();
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }