Java by API/java.net/URLConnection

Содержание

1 URLConnection: connect() throws IOException
2 URLConnection: getContentEncoding()
3 URLConnection: getContentType()
4 URLConnection: getExpiration()
5 URLConnection: getHeaderField(int n)
6 URLConnection: getHeaderFieldKey(int n)
7 URLConnection: getHeaderFields()
8 URLConnection: getIfModifiedSince()
9 URLConnection: getInputStream()
10 URLConnection: getLastModified()
11 URLConnection: getURL()
12 URLConnection: setAllowUserInteraction(boolean allowuserinteraction)
13 URLConnection: setDoInput(boolean doinput)
14 URLConnection: setDoOutput(boolean dooutput)
15 URLConnection: setIfModifiedSince(long ifmodifiedsince)
16 URLConnection: setRequestProperty(String key, String value)
17 URLConnection: setUseCaches(boolean usecaches)

URLConnection: connect() throws IOException

   <source lang="java">

import java.io.InputStream; import java.net.URL; import java.net.URLConnection; public class Main {

 public static void main(String[] argv) throws Exception {
   
   URLConnection conn = new URL("http://www.yourserver.ru").openConnection();
   conn.setDoInput(true);
   conn.setRequestProperty("Authorization", "asdfasdf");
   conn.connect();
   InputStream in = conn.getInputStream();
 }

}

 </source>

URLConnection: getContentEncoding()

   <source lang="java">

import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String args[]) {
   try {
     URL u = new URL("http://www.jexp.ru");
     URLConnection uc = u.openConnection();
     System.out.println("Content-encoding: " + uc.getContentEncoding());
   } catch (MalformedURLException e) {
     System.err.println("not a URL I understand");
   } catch (IOException e) {
     System.err.println(e);
   }
 }

}

 </source>

URLConnection: getContentType()

   <source lang="java">

import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import java.util.Date; import java.util.Enumeration; import java.util.Hashtable; import java.util.StringTokenizer; public class Main {

 public static void main(String args[]) throws Exception {
   int c;
   URL hp = new URL("http://www.internic.net");
   URLConnection hpCon = hp.openConnection();
   long d = hpCon.getDate();
   if (d == 0)
     System.out.println("No date information.");
   else
     System.out.println("Date: " + new Date(d));
   System.out.println("Content-Type: " + hpCon.getContentType());
   d = hpCon.getExpiration();
   if (d == 0)
     System.out.println("No expiration information.");
   else
     System.out.println("Expires: " + new Date(d));
   d = hpCon.getLastModified();
   if (d == 0)
     System.out.println("No last-modified information.");
   else
     System.out.println("Last-Modified: " + new Date(d));
   int len = hpCon.getContentLength();
   if (len == -1)
     System.out.println("Content length unavailable.");
   else
     System.out.println("Content-Length: " + len);
   if (len != 0) {
     InputStream input = hpCon.getInputStream();
     int i = len;
     while (((c = input.read()) != -1)) { // && (--i > 0)) {
       System.out.print((char) c);
     }
     input.close();
   } else {
     System.out.println("No content available.");
   }
 }

}

 </source>

URLConnection: getExpiration()

   <source lang="java">

import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import java.util.Date; import java.util.Enumeration; import java.util.Hashtable; import java.util.StringTokenizer; public class Main {

 public static void main(String args[]) throws Exception {
   int c;
   URL hp = new URL("http://www.internic.net");
   URLConnection hpCon = hp.openConnection();
   long d = hpCon.getDate();
   if (d == 0)
     System.out.println("No date information.");
   else
     System.out.println("Date: " + new Date(d));
   System.out.println("Content-Type: " + hpCon.getContentType());
   d = hpCon.getExpiration();
   if (d == 0)
     System.out.println("No expiration information.");
   else
     System.out.println("Expires: " + new Date(d));
   d = hpCon.getLastModified();
   if (d == 0)
     System.out.println("No last-modified information.");
   else
     System.out.println("Last-Modified: " + new Date(d));
   int len = hpCon.getContentLength();
   if (len == -1)
     System.out.println("Content length unavailable.");
   else
     System.out.println("Content-Length: " + len);
   if (len != 0) {
     InputStream input = hpCon.getInputStream();
     int i = len;
     while (((c = input.read()) != -1)) { // && (--i > 0)) {
       System.out.print((char) c);
     }
     input.close();
   } else {
     System.out.println("No content available.");
   }
 }

}

 </source>

URLConnection: getHeaderField(int n)

   <source lang="java">

import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String args[]) {
   URL u;
   URLConnection uc;
   String header;
   try {
     u = new URL("http://www.jexp.ru");
     uc = u.openConnection();
     for (int j = 1;; j++) {
       header = uc.getHeaderField(j);
       if (header == null)
         break;
       System.out.println(uc.getHeaderFieldKey(j) + " " + header);
     }
   } catch (MalformedURLException e) {
     System.err.println("not a URL I understand.");
   } catch (IOException e) {
     System.err.println(e);
   }
 }

}

 </source>

URLConnection: getHeaderFieldKey(int n)

   <source lang="java">

import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String args[]) {
   URL u;
   URLConnection uc;
   String header;
   try {
     u = new URL("http://www.jexp.ru");
     uc = u.openConnection();
     for (int j = 1;; j++) {
       header = uc.getHeaderField(j);
       if (header == null)
         break;
       System.out.println(uc.getHeaderFieldKey(j) + " " + header);
     }
   } catch (MalformedURLException e) {
     System.err.println("not a URL I understand.");
   } catch (IOException e) {
     System.err.println(e);
   }
 }

}

 </source>

URLConnection: getHeaderFields()

   <source lang="java">
 

import java.net.HttpURLConnection;

import java.net.URL; import java.net.URLConnection; import java.util.List; import java.util.Map; public class Main {

 public static void main(String[] args) throws Exception {
   String s;
   s = "http://www.y.ru/authTest";
   URL url = new URL(s);
   URLConnection urlc = url.openConnection();
   Map<String, List<String>> hf = urlc.getHeaderFields();
   for (String key : hf.keySet())
     System.out.println(key + ": " + urlc.getHeaderField(key));
   System.out.println(((HttpURLConnection) urlc).getResponseCode());
 }

}

 </source>

URLConnection: getIfModifiedSince()

   <source lang="java">

import java.net.URL; import java.net.URLConnection; import java.util.Date; public class MainClass {

 public static void main(String[] args) {
   try {
     URLConnection uc = new URL("http://www.demo2s.ru").openConnection();
     System.out.println("Will retrieve file if it"s been modified since "
         + new Date(uc.getIfModifiedSince()));
     uc.setIfModifiedSince(System.currentTimeMillis());
     System.out.println("Will retrieve file if it"s been modified since "
         + new Date(uc.getIfModifiedSince()));
   } catch (Exception e) {
     System.err.println(e);
   }
 }

}

 </source>

URLConnection: getInputStream()

   <source lang="java">

import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import java.util.Date; import java.util.Enumeration; import java.util.Hashtable; import java.util.StringTokenizer; public class Main {

 public static void main(String args[]) throws Exception {
   int c;
   URL hp = new URL("http://www.internic.net");
   URLConnection hpCon = hp.openConnection();
   long d = hpCon.getDate();
   if (d == 0)
     System.out.println("No date information.");
   else
     System.out.println("Date: " + new Date(d));
   System.out.println("Content-Type: " + hpCon.getContentType());
   d = hpCon.getExpiration();
   if (d == 0)
     System.out.println("No expiration information.");
   else
     System.out.println("Expires: " + new Date(d));
   d = hpCon.getLastModified();
   if (d == 0)
     System.out.println("No last-modified information.");
   else
     System.out.println("Last-Modified: " + new Date(d));
   int len = hpCon.getContentLength();
   if (len == -1)
     System.out.println("Content length unavailable.");
   else
     System.out.println("Content-Length: " + len);
   if (len != 0) {
     InputStream input = hpCon.getInputStream();
     int i = len;
     while (((c = input.read()) != -1)) { // && (--i > 0)) {
       System.out.print((char) c);
     }
     input.close();
   } else {
     System.out.println("No content available.");
   }
 }

}

 </source>

URLConnection: getLastModified()

   <source lang="java">

import java.net.URL; import java.net.URLConnection; public class Main {

 public static void main(String[] argv) throws Exception {
   URL u = new URL("http://127.0.0.1/test.gif");
   URLConnection uc = u.openConnection();
   uc.setUseCaches(false);
   long timestamp = uc.getLastModified();
 }

}

 </source>

URLConnection: getURL()

   <source lang="java">

import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String args[]) {
   URL u;
   URLConnection uc;
   try {
     u = new URL("http://www.jexp.ru/");
     try {
       uc = u.openConnection();
       System.out.println(uc.getURL());
     } catch (IOException e) {
       System.err.println(e);
     }
   } catch (MalformedURLException e) {
     System.err.println(e);
   }
 }

}

 </source>

URLConnection: setAllowUserInteraction(boolean allowuserinteraction)

   <source lang="java">

import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String[] args) {
   try {
     MyHttpHandler handler = new MyHttpHandler();
     URLConnection uc = handler.openConnection(new URL("http://www.ora.ru"));
     if (!uc.getAllowUserInteraction()) {
       uc.setAllowUserInteraction(true);
     }
   } catch (MalformedURLException e) {
     System.err.println(e);
   } catch (IOException e) {
     System.err.println(e);
   }
 }

} class MyHttpHandler extends sun.net.www.protocol.http.Handler {

 public URLConnection openConnection(URL u) throws IOException {
   return super.openConnection(u);
 }

}

 </source>

URLConnection: setDoInput(boolean doinput)

   <source lang="java">

import java.io.DataInputStream; import java.io.DataOutputStream; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String args[]) throws Exception {
   String query = "name=yourname&email=youremail@yourserver.ru";
   URLConnection uc = new URL("http:// your form ").openConnection();
   uc.setDoOutput(true);
   uc.setDoInput(true);
   uc.setAllowUserInteraction(false);
   DataOutputStream dos = new DataOutputStream(uc.getOutputStream());
   // The POST line, the Accept line, and
   // the content-type headers are sent by the URLConnection.
   // We just need to send the data
   dos.writeBytes(query);
   dos.close();
   // Read the response
   DataInputStream dis = new DataInputStream(uc.getInputStream());
   String nextline;
   while ((nextline = dis.readLine()) != null) {
     System.out.println(nextline);
   }
   dis.close();
 }

}

 </source>

URLConnection: setDoOutput(boolean dooutput)

   <source lang="java">

import java.io.DataInputStream; import java.io.DataOutputStream; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String args[]) throws Exception {
   String query = "name=yourname&email=youremail@yourserver.ru";
   URLConnection uc = new URL("http:// your form ").openConnection();
   uc.setDoOutput(true);
   uc.setDoInput(true);
   uc.setAllowUserInteraction(false);
   DataOutputStream dos = new DataOutputStream(uc.getOutputStream());
   // The POST line, the Accept line, and
   // the content-type headers are sent by the URLConnection.
   // We just need to send the data
   dos.writeBytes(query);
   dos.close();
   // Read the response
   DataInputStream dis = new DataInputStream(uc.getInputStream());
   String nextline;
   while ((nextline = dis.readLine()) != null) {
     System.out.println(nextline);
   }
   dis.close();
 }

}

 </source>

URLConnection: setIfModifiedSince(long ifmodifiedsince)

   <source lang="java">

import java.net.URL; import java.net.URLConnection; import java.util.Date; public class MainClass {

 public static void main(String[] args) {
   try {
     URLConnection uc = new URL("http://www.demo2s.ru").openConnection();
     System.out.println("Will retrieve file if it"s been modified since "
         + new Date(uc.getIfModifiedSince()));
     uc.setIfModifiedSince(System.currentTimeMillis());
     System.out.println("Will retrieve file if it"s been modified since "
         + new Date(uc.getIfModifiedSince()));
   } catch (Exception e) {
     System.err.println(e);
   }
 }

}

 </source>

URLConnection: setRequestProperty(String key, String value)

   <source lang="java">

import java.io.InputStream; import java.net.URL; import java.net.URLConnection; class MainClass {

 public static void main(String[] args) throws Exception {
   URL url = new URL("http://www.x.ru");
   URLConnection urlc = url.openConnection();
   urlc.setRequestProperty("User-Agent", "Mozilla 5.0 (Windows; U; "
       + "Windows NT 5.1; en-US; rv:1.8.0.11) ");
   InputStream is = urlc.getInputStream();
   int c;
   while ((c = is.read()) != -1)
     System.out.print((char) c);
 }

}

 </source>

URLConnection: setUseCaches(boolean usecaches)

   <source lang="java">

import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class MainClass {

 public static void main(String[] args) {
   URL u;
   URLConnection uc;
   try {
     u = new URL("http://www.jexp.ru");
     try {
       uc = u.openConnection();
       if (uc.getUseCaches()) {
         uc.setUseCaches(false);
       }
     } catch (IOException e) {
       System.err.println(e);
     }
   } catch (MalformedURLException e) {
     System.err.println(e);
   }
 }

}

 </source>

Java by API/java.net/URLConnection

Содержание

URLConnection: connect() throws IOException

URLConnection: getContentEncoding()

URLConnection: getContentType()

URLConnection: getExpiration()

URLConnection: getHeaderField(int n)

URLConnection: getHeaderFieldKey(int n)

URLConnection: getHeaderFields()

URLConnection: getIfModifiedSince()

URLConnection: getInputStream()

URLConnection: getLastModified()

URLConnection: getURL()

URLConnection: setAllowUserInteraction(boolean allowuserinteraction)

URLConnection: setDoInput(boolean doinput)

URLConnection: setDoOutput(boolean dooutput)

URLConnection: setIfModifiedSince(long ifmodifiedsince)

URLConnection: setRequestProperty(String key, String value)

URLConnection: setUseCaches(boolean usecaches)

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