Use of HttpServletRequest objects

The browser encapsulates all the request information into the HttpServletRequest object.

The browser accesses the resource directly, and the default submission method is the Get method.

Entity content: Only post-submitted parameters are placed in the entity content.

1@WebServlet ("/requestdemo1")2  Public classRequestDemo1extendsHttpServlet {3     /**4 * These action servers have been done:5 * 1) The Tomcat server receives the request data sent by the browser and encapsulates it to the HttpServletRequest object6 * 2) The Tomcat server calls the Doget method and passes the request object into the servlet7      * @authorMaodoer8      *9      */Ten     protected voidDoget (HttpServletRequest request, httpservletresponse response)throwsservletexception, IOException { One     /** A * 3) Remove the request data from the requests object.  -      */ -         /** the * 3.1 Request lines -          */ -System.out.println ("Request method:" +request.getmethod ());//Request Method -System.out.println ("URI:" +request.getrequesturi ());//Requesting Resources +System.out.println ("URL:" +Request.getrequesturl ());  -SYSTEM.OUT.PRINTLN ("HTTP protocol version:" +request.getprotocol ());//HTTP protocol version +         /** A * 3.2 Request Header at          */ -String Host=request.getheader ("host");//take the value of the head according to the header name - System.out.println (host); -Enumeration<string> enums = Request.getheadernames ();//gets all the names in the request request header -          while(Enums.hasmoreelements ()) { -String Headname =enums.nextelement (); inString Headervalue =Request.getheader (headname); -System.out.println (headname+ "::" +headervalue); to         } +     } -      the     //in order to receive post-submitted requests, the post-submission request must be requested using the Dopost method * @Override $     protected voidDoPost (httpservletrequest request, HttpServletResponse resp)throwsservletexception, IOException {Panax Notoginseng         /** - * 3.3 Entity content the          */ +InputStream in = Request.getinputstream ();//Get entity Content A         byte[] buf=New byte[1024]; the         intLen=0; +          while((Len=in.read (BUF))!=-1){ -String str =NewString (buf,0, Len); $ System.out.println (str); $         } -     } -}

HttpServletRequest Object

The HttpServletRequest object is used to obtain the requested data. The Core API:

Request Line:

Request.getmethod ();//How to get Submitted

Request.getrequesturi (); Request.getrequesturl ();//Get Resources

Request.getprotocol ();//Request HTTP protocol version

Request Header:

Request.getheader ("name");//Get request value by name

Request.getheadernames ();//Gets all the names in the request header

Entity content:

Request.getinputstream ();//Get Data for entity content

Use of HttpServletRequest objects