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This article is about the sample analysis of Web server and Http in Java. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Technical explanation of Web Server

Microsoft: ASP is the earliest popular in China.

Embed the script of VB in HTML, ASP+COM

In the opening of ASP, basically a page has thousands of lines of business code, and the page is extremely chaotic.

High maintenance cost

PHP:

PHP development is very fast, powerful, cross-platform, and the code is very simple.

Limitations: unable to carry large traffic

JSP/Servlet

Bounce S: browsers and servers

Cpact S: client and server

The Bamp S architecture promoted by sun Company

Based on java (all big companies, or some open source components, are written in java)

It can bear the influence of the three high problems.

Syntax such as ASP,ASP- > JSP strengthens the market

Web server

The server is a passive operation, which is used to process some light balls of the user and some response information of the user.

IIS

Microsoft; ASP... , included in Windows

Tomcat

Tomcat is a core project in the Jakarta project of Apache Software Foundation. The latest Servlet and JSP specifications can always be reflected in Tomcat. Because of its advanced technology, stable performance and free, Tomcat is deeply loved by java lovers and recognized by some software developers, and has become a popular Web application server.

Tomcat server is a free and open source Web application server, which is a lightweight application server. It is widely used in small and medium-sized systems and not many concurrent access users. It is the first choice for developing and debugging JSP programs. For a person with Java bleeding web, it is the best choice.

Tomcat actually runs JSP pages and Servlet. The latest version of Tomcat is 9.0

Content in JAVA jdk

Jdk

Bin- execution file

Include- includes many low-level posts written by C++.

Jre

There are many jar packages in lib.

The core jar package of java is rt.jar

Contents of the TomcatTomcat root directory

Script files that bin- starts and closes

Conf- profile

Jar package on which lib- depends

Logs- log

Webapps: published website

Configuration of Tomcat

This core configuration file can be configured with many parameters

Configure the port number for startup

The default port number for Tomcat is: 8080

Mysql:3306

Http:80

Https:443

Modify as follows

ConnectionTimeout= "20000" redirectPort= "8443" / >

The name of the host can be configured

The default host name is: localhost- > 127.0.0.1

The default location for website applications is: webapps

Modify as follows

Talk about how the website is visited.

1. Enter a domain name

two。 Check to see if there is a mapping for this domain name in this season's C:\ Windows\ System32\ drivers\ etc\ hosts configuration file

Yes: return the corresponding ip address directly. In this address, there are web programs that you need to access, which can be accessed directly.

127.0.0.1 www.lengding.com

No: go to the DNS server and return if you find it. If you can't find it, you can't access it.

Publish a website

Put the website written by yourself under the folder (webapps) of the web application specified in the server (Tomcat), and you can visit it.

The structure of the website

-- web directory of the webapps:Tocat server-- ROOT-lengding: directory name of the website-WEB-INF-classes:java program-jar package that the lib:web application depends on-web.xml: website configuration file-index. The default home page of html-static-css-style.css-js-imgHttp1, What is Http?

Http is a simple request-response protocol that usually runs on top of TCP.

Text: html, string, ~...

Hypertext: picture, music, video, location, map …

Port: 80

Https: secure

four hundred and forty three

2. Two times

Http1.0

HTTP/1.0: the client can connect to the web server and can only get one web resource after the connection.

Http2.0

HTTP/1.1: the client can connect to the web server and get multiple web resources after the connection.

3. Http request

Client-send request (Request)-server

Request URL: https://www.baidu.com/ request address Request Method:GET get method / post method Status Code:200 OK status code: 200Remote (remote) Address:14.215.177.39:443Accept:text/htmlAccept-Encoding:gzip, deflate, brAccept-Language:zh-CN,zh;q=0.9 language Cache-Control:max-age=0Connection:keep-alive

Request line

Request method in the request line: GET

Request method, Get,Post,HEAD,DELETE,PUT,TRACT...

Get: the request can carry fewer parameters and is limited in size, and the data content will be displayed in the browser's URL address bar. It is not safe, but efficient.

Post: there is no limit on the parameters that the request can carry, there is no limit on the size, and the data content will not be displayed in the URL address bar of the browser. It is safe, but not efficient (it can be ignored now).

Message header

Accept: tells the browser the data type it supports Accept-Encoding: which encoding format is supported GBK UTF-8 GB2312 ISO8859-1Accept-Language: tells the browser its locale Cache-Control: cache control Connection: tells the browser whether the request is disconnected or remains connected HOST: host. / .4, Http response

Server-response-client

Cache-Control:private cache controls Connection:Keep-Alive connection Content-Encoding:gzip encoding Content-Type:text/html type

Response body

Accept: tell the browser the data type it supports Accept-Encoding: which encoding format is supported GBK UTF-8 GB2312 ISO8859-1Accept-Language: tell the browser its locale Cache-Control: cache control Connection: tell the browser whether to disconnect or remain connected when the request is completed HOST: host. / .Refresh: tell the client how often to refresh; Location: relocate the web page

Response status code

200: the request response was successful

3xx: request redirection

Redirect: you go back to the new position I gave you

4xx: resource 404 not found

Resource does not exist

5xx: server code error

five hundred

502: gateway error

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