Connect to the server through the post method of Apache httpClient, apachehttpclient

Connect to the server through the post method of Apache httpClient, apachehttpclient

The client code is:

Package lgx. java. test; import java. io. byteArrayOutputStream; import java. io. IOException; import java. io. inputStream; import java. io. unsupportedEncodingException; import java. util. arrayList; import java. util. hashMap; import java. util. list; import java. util. map; import org. apache. http. httpResponse; import org. apache. http. nameValuePair; import org. apache. http. client. clientProtocolException; import org. apache. http. Client. httpClient; import org. apache. http. client. entity. urlEncodedFormEntity; import org. apache. http. client. methods. httpPost; import org. apache. http. impl. client. defaultHttpClient; import org. apache. http. message. basicNameValuePair; public class HttpClientDemo {/*** @ param args */public static void main (String [] args) {String path = "http: // 192.168.1.48: 8080/myapp2/LoginAction "; Map <String, String> para MS = new HashMap <String, String> (); params. put ("username", "admin"); params. put ("password", "123"); String result = sendClientPostMessage (path, params, "UTF-8"); System. out. println ("-->" + result);} private static String sendClientPostMessage (String path, Map <String, String> param, String encode) {List <NameValuePair> list = new ArrayList <NameValuePair> (); String result = ""; if (param! = Null &&! Param. isEmpty () {for (Map. entry <String, String> entry: param. entrySet () {list. add (new BasicNameValuePair (entry. getKey (), entry. getValue () ;}}try {// The request parameters are encapsulated in the form. In the request body, UrlEncodedFormEntity entity = new UrlEncodedFormEntity (list, encode ); // use post to submit data HttpPost httpPost = new HttpPost (path); // you can specify the EntityhttpPost. setEntity (entity); HttpClient client = new DefaultHttpClient (); // The client starts to send the request HttpResponse respons to the specified URL E=client.exe cute (httpPost); result = StreamToString (response. getEntity (). getContent (), encode);} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke. printStackTrace ();} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke. printStackTrace ();} catch (IOException e) {// TODO Auto-generated catch blocke. printStackTrace ();} return result;}/*** converts an input stream to a specified encoded string * * @ Param inputStream input stream * @ param encode encoding format * @ return String */private static String StreamToString (InputStream inputStream, String encode) {ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream (); byte [] data = new byte [1024]; String result = ""; int len = 0; try {while (len = inputStream. read (data ))! =-1) {arrayOutputStream. write (data, 0, len);} result = new String (arrayOutputStream. toByteArray (), encode);} catch (IOException e) {// TODO Auto-generated catch blocke. printStackTrace ();} return result ;}}

The server code is:

package com.login.manager;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class LoginAction */public class LoginAction extends HttpServlet {private static final long serialVersionUID = 1L;    /**     * Default constructor.      */    public LoginAction() {        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubthis.doPost(request, response);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");PrintWriter out=response.getWriter();String username=request.getParameter("username");String password=request.getParameter("password");System.out.println(username+"---->username");System.out.println(password+"----->password");if(username.equals("admin")&&password.equals("123")){out.print("longin is success");}else{out.print("login is failed");}}}

Console of the client:

--> Longin is success

Server console:

Admin ----> username
123 -----> password

In the next article, I will write the get method of Apache to connect to the server.