Java Network connection HttpURLConnection, httpsurlconnection

The tool class consists of two methods: HTTP request, HTTPS request

Look directly at the code:

Package Com.jtools;import Java.io.bufferedreader;import Java.io.inputstream;import java.io.InputStreamReader; Import Java.io.outputstream;import java.net.connectexception;import Java.net.httpurlconnection;import Java.net.URL ; import Javax.net.ssl.httpsurlconnection;import Javax.net.ssl.sslcontext;import javax.net.ssl.SSLSocketFactory; Import javax.net.ssl.trustmanager;/** * HTTP Tool class * @author Json_wang*/public class Httputil {/** * * Initiate HTTP request and get results * @param r Equesturl Request Address * @param Requestmethod request Method (GET, POST) * @param outputstr submitted data Format (example: "Name=name&age=age")//Body, The text content actually with get URL in '? ' After the argument string is consistent * @return JSON string (the JSON format is either Jsonobject or Jsonarray, here is a string, then converted in the controller) */public static string HttpRequest (String Requesturl, String Requestmethod, String outputstr) {string resultstr = ""; StringBuffer buffer = new StringBuffer (); try {URL url = new URL (requesturl); HttpURLConnection httpurlconn = (httpurlconnection) url.openconnection (); Httpurlconn.setdooutput (true); Httpurlconn.setdOinput (True); Httpurlconn.setusecaches (false);//Set Request mode (Get/post) Httpurlconn.setrequestmethod (Requestmethod);// HttpURLConnection is based on the HTTP protocol, and its underlying is implemented via socket communication. If you do not set a timeout (timeout), in the case of a network exception, it may cause the program to zombie without continuing to execute httpurlconn.setconnecttimeout (30*1000);// 30s Timeout Httpurlconn.setreadtimeout (10*1000),//10s timeout/*//set request Properties Httpurlconn.setrequestproperty ("Content-type", "     Application/x-www-form-urlencoded ");    Httpurlconn.setrequestproperty ("Charset", "UTF-8"); *///httpurlconnection's connect () function actually just establishes a TCP connection to the server and does not actually send an HTTP request. The Get method requires an explicit connection if ("Get". Equalsignorecase (Requestmethod)) {Httpurlconn.connect ();} This post method implicitly automatically connects//when there is data to be submitted when the IF (null! = outputstr) {OutputStream outputstream = Httpurlconn.getoutputstream ();// Note the encoding format to prevent Chinese garbled outputstream.write (outputstr.getbytes ("UTF-8")); Outputstream.close ();} Convert the returned input stream to a string InputStream InputStream = Httpurlconn.getinputstream (); InputStreamReader InputStreamReader = new InputStreamReader (InputStream, "utf-8"); BufferedReader BufferedReader = new BufferedreadeR (InputStreamReader); String str = null;while ((str = bufferedreader.readline ()) = null) {buffer.append (str);} Bufferedreader.close (); Inputstreamreader.close ();//Release Resource Inputstream.close (); inputstream = null; Httpurlconn.disconnect (); resultstr = Buffer.tostring ();} catch (connectexception CE) {System.out.println ("Server connection timed out.");} catch (Exception e) { System.out.println (requesturl+ "Request error:\n" +e); return resultstr;} /** * Initiate HTTPS request and get results * * @param requesturl Request address * @param Requestmethod request (GET, POST) * @param outputstr submitted data Format (example Sub: "Name=name&age=age")//body, body content in fact with Get URL '? ' After the argument string is consistent * @return JSON string (the JSON format is either Jsonobject or Jsonarray, here is a string, then converted in the controller) */public static string Httpsrequest (String Requesturl, String Requestmethod, String outputstr) {string resultstr = ""; StringBuffer buffer = new StringBuffer (); try {//Create Sslcontext object and initialize trustmanager[with our specified trust Manager] TM = {New Myx509trustmana GER ()}; Sslcontext Sslcontext = sslcontext.getinstance ("SSL "," Sunjsse "); Sslcontext.init (NULL, TM, New Java.security.SecureRandom ());// Sslsocketfactory object Sslsocketfactory SSF = Sslcontext.getsocketfactory () obtained from the above Sslcontext object; URL url = new URL (requesturl); Httpsurlconnection httpurlconn = (httpsurlconnection) url.openconnection (); httpurlconn.setsslsocketfactory (SSF); Httpurlconn.setdooutput (True); Httpurlconn.setdoinput (true); Httpurlconn.setusecaches (false);//Set Request mode (get/ POST) Httpurlconn.setrequestmethod (Requestmethod),//httpurlconnection is based on the HTTP protocol, and its underlying is implemented via socket communication. If you do not set a timeout (timeout), in the case of a network exception, it may cause the program to zombie without continuing to execute httpurlconn.setconnecttimeout (30*1000);// 30s Timeout Httpurlconn.setreadtimeout (10*1000),//10s timeout/*//set request Properties Httpurlconn.setrequestproperty ("Content-type", "     Application/x-www-form-urlencoded ");    Httpurlconn.setrequestproperty ("Charset", "UTF-8"); *///httpurlconnection's connect () function actually just establishes a TCP connection to the server and does not actually send an HTTP request. The Get method requires an explicit connection if ("Get". Equalsignorecase (Requestmethod)) {Httpurlconn.connect ();} This post method implicitly automatically connects//when there is data to be submitted when the IF (null! = OutPUTSTR) {OutputStream outputstream = Httpurlconn.getoutputstream ();//Note the encoding format to prevent Chinese garbled outputstream.write ( Outputstr.getbytes ("UTF-8")); Outputstream.close ();} Convert the returned input stream to a string InputStream InputStream = Httpurlconn.getinputstream (); InputStreamReader InputStreamReader = new InputStreamReader (InputStream, "utf-8"); BufferedReader BufferedReader = new BufferedReader (InputStreamReader); String str = null;while ((str = bufferedreader.readline ()) = null) {buffer.append (str);} Bufferedreader.close (); Inputstreamreader.close ();//Release Resource Inputstream.close (); inputstream = null; Httpurlconn.disconnect (); resultstr = Buffer.tostring ();} catch (connectexception CE) {System.out.println ("Server connection timed out.");} catch (Exception e) { System.out.println (requesturl+ "Request error:\n" +e); return resultstr;} public static void Main (string[] args) {System.out.println (HttpRequest ("https://www.zhihu.com/", "GET", null));}}

Auxiliary classes:

Package Com.jtools;import Java.security.cert.certificateexception;import java.security.cert.X509Certificate; Import javax.net.ssl.x509trustmanager;/** * Certificate trust manager (for HTTPS requests) */public class Myx509trustmanager implements X509trustmanager {public void checkclienttrusted (x509certificate[] chain, String authtype) throws Certificateexception {}public void checkservertrusted (x509certificate[] chain, String authtype) throws Certificateexception {}public X509certificate[] Getacceptedissuers () {return null;}}

Attached: source code:https://github.com/JsonShare/JTools

Ps:java Network Connection HttpURLConnection and httpclient difference and contact http://blog.csdn.net/wszxl492719760/article/details/8522714

Java Network connection HttpURLConnection, httpsurlconnection