в 17:43, 31 мая 2010

2010-05-31T17:43:48Z

Admin: 1 версия

2010-05-31T14:17:10Z

1 версия

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== 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>

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Java by API/java.net/URLConnection - История изменений

в 17:43, 31 мая 2010

Admin: 1 версия