A detailed explanation of how PHP curl and Java http are used

This article is mainly for you to introduce the PHP Curl and Java HTTP use method, with a certain reference value, interested in small partners can refer to

PHP Curl

Sometimes our projects need to interact with third-party platforms. Let me give you an example.

There are now a, b two platforms. During the initial period, party a realizes part of the key business (such as user information, etc.) by a. Then, for some reason, there are some businesses that need B to implement, and the implementation program calls some sensitive interfaces to run on the B-party server only, then it can only do two platform interactions. Curl is the solution to this problem.

Curl is a php extension that you can view as a lite browser that can access other websites.
To use curl you have to turn on the relevant configuration in php.ini to use it.
The data format of the interaction between the common platforms has JSON, XML and other popular data formats.

<?php @param $url  interface Address $https whether an HTTPS request $post is a POST request $post _data post submission Data array Format function curlhttp ($url, $https = False, $post = False, $post _data = Array ()) {  $ch = Curl_init ();                            Initializes a Curl  curl_setopt ($ch, Curlopt_url, $url);     Set interface address such as: http://wwww.xxxx.co/api.php  curl_setopt ($ch, curlopt_returntransfer,1);//Whether to assign the contents of Crul to the variable  curl_setopt ($ch, curlopt_header,0);//whether a response header/  * is required for post submission data */if  ($post) {    curl_setopt ($ch, Curlopt_post , 1);    if (!empty ($post _data)) {      curl_setopt ($ch, Curlopt_postfields, $post _data);    }  }  /* Require Security certificate *  /if ($https)  {    curl_setopt ($ch, Curlopt_ssl_verifypeer, FALSE);  The HTTPS request does not validate the certificate and the hosts    curl_setopt ($ch, Curlopt_ssl_verifyhost, FALSE);  }  $output = curl_exec ($ch);  Curl_close ($ch);  return $output;}? >

Now interface address Http://www.xxxxx.com/api/{sid} This interface address can return a user's JSON data format via get, so how do we get data from third-party platforms?

<?php    $sid = 1;    $url = "http://www.xxxxx.com/api/{$sid}";    $data = Curlhttp ($url);  $user = Json_decode ($data, true);?>

Where $user is to get the user array information.
Here the Curl Simulation browser makes a GET request for the domain name (of course, according to our settings in the parameters, we can also simulate the post HTTPS request), get the response data.

Java HTTP implements PHP-like Curl functionality

Java is a completely object-oriented language, I think in addition to the object name is long enough not easy to remember. The rest is good, and it is compiled into bytecode and then run by the Java Virtual machine, unlike PHP, which needs to be compiled once a time to run.
Java's implementation of PHP curl

File tool. HttpRequest

Package Tool;import Java.io.bufferedreader;import Java.io.ioexception;import java.io.inputstreamreader;import Java.io.printwriter;import java.net.url;import java.net.urlconnection;import Java.util.list;import java.util.Map;      Import Java.net.urlencoder;import Log.log;public class HttpRequest {/** * a request to send a GET method to a specified URL * * @param URL *   The URL of the sending request * @param param * Request parameter, the request parameter should be in the form of name1=value1&name2=value2.    * @return The response result of the remote resource represented by String */public static string get (String url,string param) {string result = "";    BufferedReader in = null;      try {String urlnamestring = null;      if (param = = null) urlnamestring = URL;      else urlnamestring = URL + "?" + param;      System.out.println ("Curl http URL:" + urlnamestring);      URL realurl = new URL (urlnamestring);      The connection between open and URL urlconnection connection = Realurl.openconnection ();      Set the generic request attribute Connection.setrequestproperty ("accept", "*/*"); Connection.setrequestProperty ("Connection", "close"); Connection.setrequestproperty ("User-agent", "mozilla/4.0" (compatible; MSIE 6.0; Windows NT 5.1;      SV1) ");      Establish the actual connection connection.connect ();      /*//Get all response header fields Map<string, list<string>> Map = Connection.getheaderfields ();      Traverse all the response header fields for (String Key:map.keySet ()) {System.out.println (key + "--->" + map.get (key)); } *///define BufferedReader input stream to read the response of the URL in = new BufferedReader (New InputStreamReader (connection.getinputstr      EAM ()));      String Line;      while (line = In.readline ()) = null) {result + = line; }} catch (Exception e) {System.out.println ("Send GET request exception!)      "+ e);    E.printstacktrace ();        }//Use finally block to close the input stream finally {try {if (in! = null) {in.close ();      }} catch (Exception E2) {e2.printstacktrace (); }} return Result.equals ("")?  Null:result; /** * Request to send a POST method to the specified URL *   * @param URL * Send request URL * @param param * Request parameter, request parameter should be in the form of name1=value1&name2=value2.    * @return The response result of the remote resource represented by String */public static string post (string url, string param) {printwriter out = null;    BufferedReader in = null;    String result = "";      try {URL realurl = new URL (URL);      The connection between open and URL URLConnection conn = realurl.openconnection ();      Set the generic request attribute Conn.setrequestproperty ("accept", "*/*");      Conn.setrequestproperty ("Connection", "keep-alive"); Conn.setrequestproperty ("User-agent", "mozilla/4.0" (compatible; MSIE 6.0; Windows NT 5.1;      SV1) ");      The Send POST request must be set to the following two lines conn.setdooutput (true);      Conn.setdoinput (TRUE);      Gets the output stream corresponding to the URLConnection object out = new PrintWriter (Conn.getoutputstream ());      Send request parameter out.print (param);      Flush output Stream Buffer Out.flush ();      Defines the BufferedReader input stream to read the response of the URL in = new BufferedReader (New InputStreamReader (Conn.getinputstream ())); StRing Line;      while (line = In.readline ()) = null) {result + = line; }} catch (Exception e) {System.out.println ("send POST request exception!      "+e);    E.printstacktrace ();        }//Use the finally block to close the output stream, input stream finally{try{if (out!=null) {out.close ();        } if (In!=null) {in.close ();      }} catch (IOException ex) {ex.printstacktrace ();  }} return result; }  }

Then use PHP like the following

Web.app.controller.IndexController

Package Web.app.controller;import tool. Httprequest;import Org.springframework.stereotype.controller;import Org.springframework.web.bind.annotation.requestmapping;import Org.springframework.web.bind.annotation.requestmethod;import Org.springframework.web.bind.annotation.responsebody;import net.sf.json.JSONObject; @Controller @requestmapping (" Index ") public class indexcontroller{    @RequestMapping (value=" index ", Method={requestmethod.get, requestmethod.post},produces= "Text/html;charset=utf-8")     @ResponseBody public  String Index ()  {    String sid = "1";    String Apiurl = "http://www.xxxxx.com/api/" +SID;        String data = Httprequest.get (apiurl,null);   Start simulating browser request        jsonobject JSON = jsonobject.fromobject (data);  Parse the returned JSON data result  }}