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一个Web Server 也叫做 HTTP Server,因为它用HTTP来和客户端(web浏览器)沟通。
基于Java的web server使用两个类: java.net.Socket 和 java.net.ServerSocket。
HTTP
是一个request和response协议。客户端请求一个文件,服务器答复这个请求。HTTP使用可靠的TCP连接。
HTTP Request 包括:
- Method - Uniform Resource Identifier (URI) - Protocol/Version
- Request headers
- Entity body
例如:
POST /examples/default.jsp HTTP/1.1
Accept: text/plain; text/html
Accept-Language: en-gb
Connection: Keep-Alive
Host: localhost
User-Agent: Mozilla/4.0 (compatible; MSIE 4.01; Windows 98)
Content-Length: 33
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
lastName=Franks&firstName=Michael
HTTP1.1支持七种request类型:GET, POST, HEAD, OPTIONS, PUT, DELETE 和 TRACE, 用最多的是GET 和POST。
HTTP Response包括:
- Protocal - Status Code - Description
- Response headers
- Entity body
例如:
HTTP/1.1 200 OK
Server: Microsoft-IIS/4.0
Date: Mon, 5 Jan 2004 13:13:33 GMT
Content-Type: text/html
Last-Modified: Mon, 5 Jan 2004 13:13:12 GMT
Content-Length: 112
<html>
<head>
<title>HTTP Response Example</title>
</head>
<body>
Welcome to Brainy Software
</body>
</html> |
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