HttpClient Post and get access to Web pages

One, the base jar package MAVEN project Pom.xml need to configure the jar package

<dependencies><dependency><groupid>junit</groupid><artifactid>junit</ artifactid><version>4.8.2</version><scope>test</scope></dependency>< dependency><groupid>org.apache.httpcomponents</groupid><artifactid>httpclient</ Artifactid><version>4.1.2</version></dependency><dependency><groupid> Org.apache.httpcomponents</groupid><artifactid>httpclient-cache</artifactid><version> 4.1.2</version></dependency><dependency><groupid>org.apache.httpcomponents</groupid ><artifactId>httpmime</artifactId><version>4.1.2</version></dependency>< Dependency><groupid>log4j</groupid><artifactid>log4j</artifactid><version> 1.2.16</version></dependency></dependencies>

Second, the source code

Package Com.qidou.httpclient;import Java.io.unsupportedencodingexception;import Java.util.arraylist;import Java.util.iterator;import java.util.list;import java.util.map;import Java.util.map.entry;import java.util.Set; Import Org.apache.http.httpresponse;import Org.apache.http.namevaluepair;import Org.apache.http.client.entity.urlencodedformentity;import Org.apache.http.client.methods.httpget;import Org.apache.http.client.methods.httppost;import Org.apache.http.client.methods.httpurirequest;import Org.apache.http.impl.client.defaulthttpclient;import Org.apache.http.message.basicnamevaluepair;import Org.apache.http.protocol.http;import Org.apache.http.util.entityutils;import org.apache.log4j.Logger;/** * The HTTP request client, which provides get and post two ways to send the request. * * @author Administrator * */public class HttpClient {/** * log object. */private static Logger Logger = Logger.getlogger (httpclient.class);/** * Default HTTP Request client object. */private defaulthttpclient _httpclient;/** * user-defined message header. */private map<string, string> _headers;/* * Use the default client object. */public HttpClient () {//1. Create a HttpClient object. _httpclient = new Defaulthttpclient (); Logger.info ("Create _httpclient ..."); /** * Caller Specifies the client object. * * @param httpclient */public httpclient (map<string, string> headers) {//1. Create a HttpClient object. _httpclient = new Defaulthttpclient (); this._headers = Headers;logger.info ("Create _httpclient ..."); /** * HTTP POST request. * * @param URL * @param params * @return * @throws interruptedexception */public httpresponse post (String URL, map<str ING, string> params) {//2. Create an instance of the request method and specify the request URL to add the request parameters. HttpPost post = postform (URL, params); Logger.info ("Create HttpPost:" + URL); return invoke (POST); /** * HTTP GET request. * * @param URL * @return */public httpresponse get (String URL) {httpget get = new HttpGet (URL); Logger.info ("Create Httpge T: "+ url"); return invoke (get);} /** * Send a request to process the response. * @param request * @return */private HttpResponse invoke (Httpurirequest request) {if (this._headers! = null) {//addheaders ( request); Logger.info ("Addheaders toHTTP ... "); HttpResponse response = null;try{//3. Call Execute (httpurirequest request) of the HttpClient object to send the request, returning a HttpResponse. Response = _httpclient.execute (request); Logger.info ("Execute HTTP success ...; BODY = "+ entityutils.tostring (response.getentity ()));} catch (Exception e) {e.printstacktrace (); Logger.info ("Execute HTTP Exception ..."); finally{//4. The connection must be released regardless of the success of the execution method. Request.abort (); Logger.info ("Release http ..."); return response;} /** * Gets the post method. * * @param URL * @param params * @return */private httppost postform (String URL, map<string, string> params) {HTTPP OST httpost = new HttpPost (URL); list<namevaluepair> Nvps = new arraylist<namevaluepair> ();//assembly parameters. set<string> KeySet = Params.keyset (); for (String Key:keyset) {nvps.add (New Basicnamevaluepair (Key, Params.get ( key));} try {logger.info ("Set utf-8 form entity to HttpPost ...") httpost.setentity (new Urlencodedformentity (Nvps, HTTP. utf_8));} catch (Unsupportedencodingexception e) {e.printstacktrace ();} Return HTTPost;} /** * Add message header. * * @param httpost */private void Addheaders (Httpurirequest httpost) {iterator<entry<string, string>> it = thi S._headers.entryset (). iterator (); entry<string, string> Entry = null; String name = NULL; String value = Null;while (It.hasnext ()) {entry = It.next (); name = Entry.getkey (); value = Entry.getvalue (); Httpost.addheader (name, value);}} /** * Close the HTTP client link. */public void Shutdown () {_httpclient.getconnectionmanager (). shutdown (); Logger.info ("Shutdown _httpclient ...");}

Third, test example

Package Com.qidou.httpclient;import Java.util.hashmap;import Java.util.map;import org.apache.http.httpresponse;/** * HTTP client Test class. */public class Testhttpclient {/** * HTTP request client. */private HttpClient httpclient;/** * Initializes the HTTP request client. */{system.out.println ("Init http client ..."); map<string,string> headers = new hashmap<string,string> () headers.put ("Accept", "*/*"); Headers.put (" Accept-encoding "," gzip, deflate "); Headers.put (" Accept-language "," ZH-CN "); Headers.put (" Connection "," keep-alive ") ; Headers.put ("Cookie", "UC_SID=66134277449DCC94B77DFBCDB65A3D70; CNA=HNMMDIROZW4CABDDI+IUYSCJ; phpsessid=91818085719e575f59bd5f4b31df402f; lzstat_uv=260674130547154807|3037573; lzstat_ss=582317835_2_1409680845_3037573; phpsessid=91818085719e575f59bd5f4b31df402f; Frontvar=lns%3dmenu-1%2cflow-0%2ctraf-0%2ccont-0%2cvisitor-0%2ceanalysis-0%2cbigdata-0%2c%26cmenu%3dsite_ Overview%26siteshowhis%3dopen; Cnzzdata30086426=cnzz_eid%3d2088392191-1409645088-http%253a%252f%252ftongji.cnzz.com%252f%26ntime%3d1409650488; cnzzdata30069868=cnzz_eid%3d241047449-1409644292-http%253a%252f%252ftongji.cnzz.com%252f%26ntime%3d1409647196; cnzzdata33222=cnzz_eid%3d1336832806-1409645823-http%253a%252f%252ftongji.cnzz.com%252f%26ntime%3d1409651227; cnzzdata30001831=cnzz_eid%3d732886644-1409644865-http%253a%252f%252ftongji.cnzz.com%252f%26ntime%3d1409649918; _cnzz_cv30069868=%e6%98%af%e5%90%a6%e7%99%bb%e5%bd%95%7c%e6%ad%a3%e5%b8%b8%e7%99%bb%e5%bd%95%7c1409680810339 ") ; Headers.put ("User-agent", "mozilla/4.0" (compatible; MSIE 7.0; Windows NT 6.1; trident/5.0; SLCC2;. NET CLR 2.0.50727;. NET CLR 3.5.30729;. NET CLR 3.0.30729); Headers.put ("Referer", "http://www.baidu.com/"); Headers.put ("X-requested-with", "XMLHttpRequest");//Create a new HTTP request client, you can set some parameters of the message header: HttpClient = new HttpClient (headers ); httpClient = new HttpClient ();} /** * Test method.  * Implementation process: * 1, using username/password to login Renren: http://www.renren.com/PLogin.do * 2, visit the blog: http://blog.renren.com/blog/304317577/449470467 * */@org. junit.testpublic void Testpost () {String URL = "HTTp://www.renren.com/plogin.do "; String RedirectURL = "http://blog.renren.com/blog/304317577/449470467"; String userName = ".... "; String password = ".... ";/** * Login parameters. */map<string,string> params = new hashmap<string,string> ();p arams.put ("Origurl", RedirectURL); Params.put ("Domain", "renren.com");p arams.put ("Isplogin", "true");p arams.put ("FormName", "");p Arams.put ("Method", "");p Arams.put ("Submit", "Login");p arams.put ("email", userName);p arams.put ("password", password);//Send request to login Renren. HttpResponse postresponse = Httpclient.post (url,params);//Gets the header's jump address and jumps to the specified blog. String redirectlocation = Postresponse.getfirstheader ("location"). GetValue (); System.out.println (redirectlocation);//Get Jump Blog page. Httpclient.get (redirectlocation);//close the HTTP request client. Httpclient.shutdown ();}}

Iv. running result init http client ...
2014-09-04 18:31:48 [com.qidou.httpclient.httpclient]-[info] Create _httpclient ...
2014-09-04 18:31:48 [com.qidou.httpclient.httpclient]-[info] set Utf-8 form entity to httppost ...
2014-09-04 18:31:48 [Com.qidou.httpclient.httpclient]-[info] Create httppost:http://www.renren.com/plogin.do
2014-09-04 18:31:49 [Org.apache.http.client.protocol.responseprocesscookies]-[warn] Cookie rejected: "[version:0][ Name:t][value:f28a837f39c7773213280e099b611aaf][domain:renren.com][path:/xtalk/][expiry:null] ". Illegal path attribute "/xtalk/". Path of Origin: "/plogin.do"
2014-09-04 18:31:49 [Com.qidou.httpclient.httpclient]-[info] execute HTTP success ...; BODY = The URL has moved <a href= "http://blog.renren.com/blog/304317577/449470467" >here</a>


2014-09-04 18:31:49 [com.qidou.httpclient.httpclient]-[info] release http ...
http://blog.renren.com/blog/304317577/449470467
2014-09-04 18:31:49 [Com.qidou.httpclient.httpclient]-[info] Create httpget:http://blog.renren.com/blog/304317577/ 449470467
2014-09-04 18:31:49 [Com.qidou.httpclient.httpclient]-[info] execute HTTP success ...; BODY = Blog page is too large to omit ...


2014-09-04 18:31:49 [com.qidou.httpclient.httpclient]-[info] release http ...
2014-09-04 18:31:49 [com.qidou.httpclient.httpclient]-[info] shutdown _httpclient ...

HttpClient Post and get access to Web pages