0012-每特教育螞蟻課堂深入理解http協(xié)議與12306搶票實現(xiàn)

1、Http 一、Http 協(xié)議入httphttp 協(xié)議： 對瀏覽器客戶端 和 服務(wù)器端 之間二Http 一、Http 協(xié)議入httphttp 協(xié)議： 對瀏覽器客戶端 和 服務(wù)器端 之間二、查http 協(xié)議的工2）使用谷歌的http協(xié)議響應(yīng)（服務(wù)器-瀏覽器HTTP/1.1200Content-Length: 24Date:Fri,30Jan201501:54:57thisoGET /day09/ o HTTP/1.1 Host: localhost:8080User-Agent:Mozilla/5.0(WindowsNT6.1;WOW64;rv:35.0)Gecko/20100101Firefox

2、/35.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Encoding: gzip, deflate 四、Http3.1 GETo#http#請求資資源標(biāo)記符。四、Http3.1 GETo#http#請求資資源標(biāo)記符。o（/0/myweb/indx.html# T、HEAD、TRACE、PUT、CONNECT 常用的請求方式： TGEToHost:User-Agent:Mozilla/5.0(WindowsNT6.1;WOW64;rv:35.0)Gecko/20100101Fire

3、fox/35.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Encoding: gzip, deflate formaction=提交地址T formaction=提交地址T c）GET。T 3.2 Accept:- : - Host: localhost:8080User-Agent:Mozilla/5.0(WindowsNT6.1;WOW64;rv:35.0)Gecko/20100101Firefox/35.0 Accept: text/html,application/xht

4、ml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Encoding: gzip, deflateConnection:keep-Host: localhost:8080User-Agent:Mozilla/5.0(WindowsNT6.1;WOW64;rv:35.0)Gecko/20100101Firefox/35.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Encoding: gzip, deflateConnection:keep-3.

5、3 實體 3.4HttpServletRequest 3.3 實體 3.4HttpServletRequest 實體內(nèi)容3.5service doXX 方法區(qū)HttpSevlet類的源碼protectedvoidservice(HttpServletRequestreq,HttpServletResponse throwsServletException,IOExceptionAccept-Language:en-us,zh-If-Modified-Since: Tue, 11 Jul 2000 18:23:51 GMT- 當(dāng)前請求來自于哪里User-Agent:Mozilla/4.0comp

6、atibleMSIE5.5;WindowsNT- 瀏覽器保存Connection: close/Keep- 瀏覽器跟服務(wù)器連接狀態(tài)。close: Date:Tue11Jul200018:23:51- /得到請求方/得到請求方Stringmethod=if (method.equals(METHOD_GET) longlastModified=if(lastModified=-1)/servletdoesntsupportif-modified-since,no/togothroughfurtherexpensivelogic doGet(req, resp);elselongtryifModi

7、fiedSince = catch(IllegalArgumentExceptioniae)/ Invalid date header - proceed as if nifModifiedSince = -1;if(ifModifiedSince(lastModified/1000*1000)/Iftheservletmodtimeislater,call/Rounddowntothenearestsecondfora/AifModifiedSinceof-1willalwaysbeless maybeSetLastModified(resp, lastModified); doGet(re

8、q, resp);elseelseif long lastModified = doHead(req, resp);elseift(req,elseifdoPut(req,elseif案例時間 案例防1 2 ：案例時間 案例防1 2 ：)代碼elseifelseifelse/tthismeansNOservletsupports/methodwasrequested,anywhereonthisStringerrMsgObject errArgs = new Object1; errArgs0 = method;errMsg=MessageFormat.format(errMsg,3.8 傳遞

9、的請求參數(shù)如何GET3.8 傳遞的請求參數(shù)如何GETURIT TpublicclassImgFilterimplementsFilterpublicvoiddestroy()/TODOAuto-generatedmethodpublicvoiddoFilter(ServletRequestservletRequest,ServletResponse servletResponse, FilterChain filterChain)throwsIOException,ServletExceptionHttpServletRequest request = (HttpServletRequest)

10、 servletRequest; HttpServletResponseresponse=(HttpServletResponse)servletResponse; String referer = request.getHeader(referer);ln(referis+ if(referer=null| elsefilterChain.doFilter(request,publicvoidinit(FilterConfigarg0)throwsServletException/TODOAuto-generatedmethod。的 API： 取多個值的參數(shù)Http響應(yīng)#http 協(xié)議。的

11、API： 取多個值的參數(shù)Http響應(yīng)#http 協(xié)議#狀態(tài)碼: 服務(wù)器處理請求的結(jié)果（狀態(tài)200 #常見的響應(yīng) HTTP/1.1200Server: Apache-Coyote/1.1Content-Length: 24Date:Fri,30Jan201501:54:57thiso5.3HttpServletResponse對 5.3HttpServletResponse對 5.4 案例- 請求重定向resp.setHeader(Location,Server:apache: - : Content-Type: text/html; charset=GB2312Last-Modified: T

12、ue, 11 Jul 2000 18:23:51 GMTRefresh: 1;url=ition:attaent; filename=aaa.zip -表示告訴瀏覽器以:SS=Q0=5Lb_nQ; path=/searchExpires:1Cache-Controlno-cachePragma:no-Connection: close/Keep-Alive接 keep-alive:保存連接六、Https6.1.1http6.1.2https六、Https6.1.1http6.1.2https都知道 HTTPS 能夠加密信息，以免敏感信息被第級別較高的服務(wù)都會采用 HTTPS 協(xié)議。客戶端在使用

13、HTTPS 方式與Web 服務(wù)器通信時有以下幾個步驟客戶使用https 的Web 服務(wù)器，要求與Web 服務(wù)器建立SSL 連接Web 服務(wù)器收到客戶端請求后，會信息Web SSL Web 服務(wù)器利用自己的私 1、https 協(xié)議需要到ca 申2、http 是超文本傳輸協(xié)議，信息是明文傳輸，https ssl 3、http https 804434、http 的連接很簡單，是無狀態(tài)的；HTTPS SSL+HTTP 協(xié)議構(gòu)建的可進行加密傳輸、認證的網(wǎng)絡(luò)協(xié)議，比 http 協(xié)議安全。6.1.3https雖然說HTTPS6.1.3https雖然說HTTPS 有很大的優(yōu)勢，但其相對來說，還是存HTTPS

14、 50%10% 20% HTTPS HTTP 高效，會增加數(shù)據(jù)開銷和功耗，甚至已有的安全措施也會因此而受通常需要綁定IP，不能在同一IP 上綁定多，IPv4 資源不可能支撐這個消耗HTTPS 協(xié)議的加密范圍也比較有限，在到什么作用。最關(guān)鍵的的信用鏈體系并不安全，特別是在某些國家可以控制CA 的情七、http 請求工7.1 客戶端模七、http 請求工7.1 客戶端模擬http請求工tmen(谷歌插件)、RestC 7.2 服務(wù)器模擬http請求工httpc nt、httpCient* 發(fā)t請本地應(yīng)用并根據(jù)傳遞參數(shù)不同返回不同結(jié)publict()/ 創(chuàng)建默認的nt實例ntnt=/創(chuàng)建tt=Lis

15、tformparams=newArrayList(); ameValuePair(type, house); UrlEncodedFormEntity uefEntity;tryuefEntity=newUrlEncodedFormEntity(formparams,UTF-8); ln(executing request + httpCloseableHttpResponse response = httpctry HttpEntityentity=response.getEntity(); if (entity != null) ln(Responsecontent:+ EntityUti

16、ls.toString(entity, UTF-8);finallycatchntProtocolException catch(UnsupportedEncodingExceptioncatch(UnsupportedEncodingException catch(IOException finally/ 關(guān)閉連接資 catch(IOException *發(fā)送get請publicvoidget()nt httpcnt = HttpCtry 創(chuàng)建HttpGet httpget = new HttpGet(htln(executingrequest+httpget.getURI();執(zhí)行g(shù)et請

17、求CloseableHttpResponse response = httpctry HttpEntityentity=打印響應(yīng)狀if (entity != null) / 打印響應(yīng)內(nèi)容長ln(Responsecontentlength:+ ln(Responsecontent:+ finallyajax跨域?qū)崙?zhàn)解決方 。annotajax跨域?qū)崙?zhàn)解決方 。annotload type:ype:url : data : userName=余勝軍&userAge=19,s:function(msg) catch(ParseException catch(IOException finally/

18、關(guān)閉連接資 catch(IOException 使 response 添加header *); 支持使 response 添加header *); 支持有前端代碼后端代碼publicclassFromUserServletextendsHttpServletprotectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)throws ServletException, IOException t(req,protected void dot(HttpServletRequestreq,HttpServletResponseresp)throws ServletException, IOException /s-Control-Allow-Origin,ty