Android submit data to Javaweb server implementation login

Before learning Android to submit data to the PHP server did not succeed, after watching the video for two or three weeks, now finally realize the interaction with the server. Although the completion is not the PHP side, but in this process has learned a lot of things. Now let me show you my chart of achievement.

The idea is that there is a data in the server-side simulation database: username=123,password=123 users. If the data submitted by the Android is a user name and password are 123 data. The return succeeds or the failure is returned.

As the video of the tutorial is all about interacting with javaweb, I try to build a javaweb server. In this process, several problems have been encountered:

One, Tomcat and javaweb the number of digits inconsistent, 32-bit javaweb can not run on 64-bit Tomcat.

Second, the Tomcat default port number is 8080. But this port is occupied when it is running. Therefore, the port number is changed in the Web. xml file.

Solved the problem above javaweb is to write an interface to the Android side.

Create a Web project first, and then create a servlet.

Package Com.itcast.login;import Java.io.ioexception;import Javax.servlet.servletexception;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;public class Login extends HttpServlet {private static final long Serialversionuid = 1l;public Login () {super ();} public void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException { String username = request.getparameter ("username"); String Password = request.getparameter ("password"); SYSTEM.OUT.PRINTLN ("QQ number:" +username); System.out.println ("Password:" +password), if ("123". Equals (username) && "123". Equals (password)) { SYSTEM.OUT.PRINTLN ("Login Successful"); Response.getoutputstream (). Write ("Login succeeded". GetBytes ("Utf-8");} else {System.out.println ("Login Failed"); Response.getoutputstream (). Write ("Login failed". GetBytes ("Utf-8"));}} public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException { Doget (request, Response);}} 

The resulting access to the server using the Get method is:

The code on the Android side is:

 PackageCom.itheima.login;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.OutputStream;Importjava.net.HttpURLConnection;Importjava.net.MalformedURLException;Importjava.net.ProtocolException;ImportJava.net.URL;ImportJava.net.URLEncoder; Public classLoginservice { Public Staticstring loginbypost (string username,string password) {Try{String path= "Http://192.168.1.101:8090/Java/servlet/Login"; URL URL=NewURL (path); HttpURLConnection Conn=(HttpURLConnection) url.openconnection (); Conn.setconnecttimeout (5000); Conn.setrequestmethod ("POST"); String Data= "Username=" +urlencoder.encode (username) + "&password=" +urlencoder.encode (password);            SYSTEM.OUT.PRINTLN (data); Conn.setrequestproperty ("Content=type", "application/x-wwww-form-urlencoded"); Conn.setrequestproperty ("Content-length", data.length () + ""); Conn.setdooutput (true); OutputStream OS=Conn.getoutputstream ();            Os.write (Data.getbytes ()); intCode =Conn.getresponsecode ();            SYSTEM.OUT.PRINTLN (code); if(Code = = 200) {InputStream is=Conn.getinputstream (); String text=Streamtools.readinputstream (IS); returntext; }Else {                return NULL; }                    } Catch(malformedurlexception e) {//TODO auto-generated Catch blockE.printstacktrace (); System.out.println ("111111"); } Catch(protocolexception e) {System.out.println ("222222");        E.printstacktrace (); } Catch(IOException e) {System.out.println ("33333");        E.printstacktrace (); }        return NULL; }}

The result of the operation is:

Android submit data to Javaweb server implementation login