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This article mainly introduces how to use JavaWeb to achieve form submission, the article is very detailed, has a certain reference value, interested friends must read it!

Register.htmlregister.html registration form user name: password: please choose the research direction you are interested in: artificial intelligence machine Learn network security for autopilot

RegisterServlet.javapackage request;import java.io.IOException;import java.io.PrintWriter;import java.util.Arrays;import java.util.Enumeration;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse Public class RegisterServlet extends HttpServlet {/ / call out doGet method protected void doGet (HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException {/ / use req to receive request parameter String strName=req.getParameter ("username"); / / deal with Chinese miscommunication problem byte [] bs=strName.getBytes ("iso8859-1") String name=new String (bs, "utf-8"); System.out.println (name);} / call out the doPost method protected void doPost (HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException {/ / set the encoding req.setCharacterEncoding ("utf-8") in the request parameters / / use req to receive request parameters String strName=req.getParameter ("username"); System.out.println ("strName");} / / call out service method protected void service (HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {PrintWriter pw=response.getWriter () System.out.println ("Registration...") / / 1. Get the full path of the request sent by the browser; StringBuffer sbuf=request.getRequestURL (); pw.println ("url:" + sbuf); / / System.out.println (sbuf); / / 2. Get the resource name part-address after 8080 in the request path; String uri=request.getRequestURI (); pw.println ("uri:" + uri); / / 3. Get the parameters in the request path; String qs=request.getQueryString (); pw.println ("qs:" + qs); / / 4. Get the ip address in the request path; String ip=request.getRemoteAddr (); pw.println ("ip:" + ip); / / ip=127.0.0.1 / / 5. Get the way the browser sends the request (get request, post request) / / on the browser side, the default way for the browser address bar to enter, hyperlink, and form is get request method / / on the browser side, the form setting method= "post" is submitted by post request method String method=request.getMethod (); pw.println ("method=" + method) / / method=GET / / 6. Get the web application name String cp=request.getContextPath (); pw.println ("cp=" + cp); / / cp=/servlet / / receive the parameters sent from the form submission / / get a single value String strName=request.getParameter ("username"); String strPwd=request.getParameter ("pwd") Pw.println ("Name:" + strName+ "Pwd:" + strPwd); / / get multiple corresponding value values String [] strInterest=request.getParameterValues ("interest"); pw.println (Arrays.toString (strInterest)); / / get all the name values in the request parameters Enumeration names=request.getAttributeNames () Pw.println (names); / / use a loop to pull out the contents of names while (names.hasMoreElements ()) {System.out.println (names.nextElement ());}

Modify the web.xml and add the following code

RegisterServlet request.RegisterServlet RegisterServlet / register reconfigure the server by clicking the icon on the left

Click Redeploy again to redeploy the Tomcat server

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