1.GET Request:
The path of the group-spelling URL, after which the submitted data is assembled into the URL, is submitted to the server.
cons : (1) security (2) Limited length can not exceed 4K (HTTP protocol limit), ie browser limit to 1K
Pros : Code is easy to write
2. We first access the server scene under the computer simulation
(1) Create a new Dynamic Web project using Eclipse, as follows:
(2) then write a servlet program (running on the server), named " Loginservlet ", as follows:
The code reads as follows:
1 PackageCom.himi.web;2 3 Importjava.io.IOException;4 Importjavax.servlet.ServletException;5 ImportJavax.servlet.annotation.WebServlet;6 ImportJavax.servlet.http.HttpServlet;7 Importjavax.servlet.http.HttpServletRequest;8 ImportJavax.servlet.http.HttpServletResponse;9 Ten /** One * Servlet Implementation class Loginservlet A */ -@WebServlet ("/loginservlet") - Public classLoginservletextendsHttpServlet { the Private Static Final LongSerialversionuid = 1L; - - /** - * @seeHttpservlet#doget (httpservletrequest request, httpservletresponse response) + */ - protected voidDoget (HttpServletRequest request, httpservletresponse response)throwsservletexception, IOException { +String QQ = Request.getparameter ("QQ")); AString Password = request.getparameter ("Password"); atSystem.out.println ("QQ:" +QQ); -System.out.println ("Password:" +password); - - //simulate the server operation, query the database, look at QQ and password is correct. Response.getoutputstream () gets an output stream that writes data to the browser (cue data) - if("10086". Equals (QQ) && "123456". Equals (password)) { -Response.getoutputstream (). Write ("Login Success". GetBytes ()); in}Else { -Response.getoutputstream (). Write ("Login Failed". GetBytes ()); to } + - } the *}
Just now we said GET request method, put the submitted data group to the URL path to submit to the server, so here Request.getparameter ();
(3) Next write a JSP dynamic page (different from the HTML static page), first we say the JSP and HTML differences, as follows:
JSP and HTML differences:
The HTML page is a static page, which is written by the user in advance and placed on the server, sent by the Web server to the client; The JSP page is a dynamic page with a JSP container that executes the Java code portion of the page and then generates the page in real time.
• The definition of an HTML page is a static page that can be run directly, and the JSP page is a dynamic page that needs to be converted into a servlet when it runs.
• HTML can be opened directly, JSP can only be published to Tomact and other servers to open
• Their headers are different, this is the JSP header "<%@ page language=" java "import=" java.util.* "pageencoding=" GBK "%>" in the header of the table has encoded format and poured into the package and so on.
• It is well-differentiated to use <%%> in JSP to write Java code, while HTML does not have <%%>.
Write a login.jsp code, under the WebContent folder :
The login.jsp code is as follows:
1 <!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en">2 <HTML>3 <Head>4 <%@ Page Language="Java"ContentType="text/html; Charset=utf-8"5 pageencoding="Utf-8"%>6 <Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8">7 <title>???????</title>8 </Head>9 <Body>Ten One <formAction= "Loginservlet"Method= "Get"> APlease enter QQ account:<inputtype= "text"name= "QQ"> <BR/> -Please enter the QQ password:<inputtype= "Password"name= "Password"> <BR/> - <inputtype= "Submit"value= "Login"> the </form> - </Body> - </HTML>
Right-click the login.jsp file , run as and run on server , and run the following results:
(4) Open 360 browser capture package to analyze the detailed process of HTTP communication:
• Open 360 Browser, address bar input:http://localhost:8080/web/login.jsp, the results are as follows:
• Enter a QQ account and QQ password, enter the QQ account :10000, enter the QQ password :123123, as follows:
The detailed fetch packet is as follows:
The data length of the Response mentioned above is (the number of characters), the following Response data content :
• Enter the correct QQ account and QQ password as follows:
The same crawled packets are:
The length of the data mentioned above is Response (the number of characters), the following Response data content :
Android (Java) Learning Note 209: Submitting data to a server with GET requests
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