Example of httpclient using the get method to read pages through the Proxy Server

Import java. Io. bufferedreader;
Import java. Io. inputstreamreader;
Import org. Apache. http. httpentity;
Import org. Apache. http. httphost;
Import org. Apache. http. httpresponse;
Import org. Apache. http. Client. Methods. httpget;
Import org. Apache. http. Conn. Params. connroutepnames;
Import org. Apache. http. impl. Client. defaulthttpclient;

/**
* Httpclient uses the get method to read pages through the proxy server.
*
* @ Author Java century network (java2000.net, laozizhu.com)
*/
Public class httpclientget {
Public static void main (string [] ARGs) throws exception {
Defaulthttpclient httpclient = new defaulthttpclient ();
// Target site, port, and Protocol
Httphost targethost = new httphost ("www.java2000.net ");
// Proxy settings
Httphost proxy = new httphost ("10.60.8.20", 8080 );
Httpclient. getparams (). setparameter (connroutepnames. default_proxy, proxy );
// Target address
Httpget = new httpget ("/");
System. Out. println ("target:" + targethost );
System. Out. println ("Request:" + httpget. getrequestline ());
// Execute
Httpresponse response = httpclient.exe cute (targethost, httpget );
Httpentity entity = response. getentity ();
System. Out. println ("----------------------------------------");
System. Out. println (response. getstatusline ());
If (entity! = NULL ){
System. Out. println ("response Content Length:" + entity. getcontentlength ());
}
// Display the result
Bufferedreader reader = new bufferedreader (New inputstreamreader (entity. getcontent (), "UTF-8 "));
String line = NULL;
While (line = reader. Readline ())! = NULL ){
System. Out. println (line );
}
If (entity! = NULL ){
Entity. consumecontent ();
}
}
}

 

2. httpclient 4. Example of using post to submit common form data

Import java. Io. bufferedreader;
Import java. Io. inputstreamreader;
Import org. Apache. http. httpentity;
Import org. Apache. http. httphost;
Import org. Apache. http. httpresponse;
Import org. Apache. http. Client. Methods. httppost;
Import org. Apache. http. Conn. Params. connroutepnames;
Import org. Apache. http. entity. stringentity;
Import org. Apache. http. impl. Client. defaulthttpclient;

/**
* Httpclient 4 uses the POST method to submit common form data.
*
* @ Author Java century network (java2000.net, laozizhu.com)
*/
Public class httpclientpost {
Public static void main (string [] ARGs) throws exception {
Defaulthttpclient httpclient = new defaulthttpclient ();
// Proxy settings
Httphost proxy = new httphost ("10.60.8.20", 8080 );
Httpclient. getparams (). setparameter (connroutepnames. default_proxy, proxy );
// Target address
Httppost = new httppost ("http://www.java2000.net/login.jsp ");
System. Out. println ("Request:" + httppost. getrequestline ());
// Construct the simplest string data
Stringentity reqentity = new stringentity ("username = Test & Password = test ");
// Set the type
Reqentity. setcontenttype ("application/X-WWW-form-urlencoded ");
// Set the requested data
Httppost. setentity (reqentity );
// Execute
Httpresponse response = httpclient.exe cute (httppost );
Httpentity entity = response. getentity ();
System. Out. println ("----------------------------------------");
System. Out. println (response. getstatusline ());
If (entity! = NULL ){
System. Out. println ("response Content Length:" + entity. getcontentlength ());
}
// Display the result
Bufferedreader reader = new bufferedreader (New inputstreamreader (entity. getcontent (), "UTF-8 "));
String line = NULL;
While (line = reader. Readline ())! = NULL ){
System. Out. println (line );
}
If (entity! = NULL ){
Entity. consumecontent ();
}
}
}

 

3. code example of httpclient 4.0 accessing HTTPS through proxy

Import java. Io. bufferedreader;
Import java. Io. inputstreamreader;
Import org. Apache. http. httpentity;
Import org. Apache. http. httphost;
Import org. Apache. http. httpresponse;
Import org. Apache. http. Auth. authscope;
Import org. Apache. http. Auth. usernamepasswordcredentials;
Import org. Apache. http. Client. Methods. httpget;
Import org. Apache. http. Conn. Params. connroutepnames;
Import org. Apache. http. impl. Client. defaulthttpclient;

/**
* Code example of httpclient 4.0 accessing HTTPS through proxy.
*
* @ Author Java century network (java2000.net, laozizhu.com)
*/
Public class httpsproxyget {
Public static void main (string [] ARGs) throws exception {
Defaulthttpclient httpclient = new defaulthttpclient ();
// Authentication data
// I am blind here, please fill in according to the actual situation
Httpclient. getcredentialsprovider (). setcredentials (New authscope ("10.60.8.20", 8080 ),
New usernamepasswordcredentials ("username", "password "));
// Target site, port, and Protocol
Httphost targethost = new httphost ("www.google.com", 443, "HTTPS ");
// Proxy settings
Httphost proxy = new httphost ("10.60.8.20", 8080 );
Httpclient. getparams (). setparameter (connroutepnames. default_proxy, proxy );
// Target address
Httpget = new httpget ("/AdSense/login/zh_cn /? ");
System. Out. println ("target:" + targethost );
System. Out. println ("Request:" + httpget. getrequestline ());
System. Out. println ("Proxy:" + proxy );
// Execute
Httpresponse response = httpclient.exe cute (targethost, httpget );
Httpentity entity = response. getentity ();
System. Out. println ("----------------------------------------");
System. Out. println (response. getstatusline ());
If (entity! = NULL ){
System. Out. println ("response Content Length:" + entity. getcontentlength ());
}
// Display the result
Bufferedreader reader = new bufferedreader (New inputstreamreader (entity. getcontent (), "UTF-8 "));
String line = NULL;
While (line = reader. Readline ())! = NULL ){
System. Out. println (line );
}
If (entity! = NULL ){
Entity. consumecontent ();
}
}
}

 

4. Example of using httpclient to read a page

Package com. laozizhu. Apache. httpclient;

Import java.net. Socket;

Import org. Apache. http. connectionreusestrategy;
Import org. Apache. http. header;
Import org. Apache. http. httphost;
Import org. Apache. http. httpresponse;
Import org. Apache. http. httpversion;
Import org. Apache. http. impl. defaultconnectionreusestrategy;
Import org. Apache. http. impl. defaulthttpclientconnection;
Import org. Apache. http. Message. basichttprequest;
Import org. Apache. http. Params. basichttpparams;
Import org. Apache. http. Params. httpparams;
Import org. Apache. http. Params. httpprotocolparams;
Import org. Apache. http. Protocol. basichttpcontext;
Import org. Apache. http. Protocol. basichttpprocessor;
Import org. Apache. http. Protocol. executioncontext;
Import org. Apache. http. Protocol. httpcontext;
Import org. Apache. http. Protocol. httprequestexecutor;
Import org. Apache. http. Protocol. requestconncontrol;
Import org. Apache. http. Protocol. requestcontent;
Import org. Apache. http. Protocol. requestexpectcontinue;
Import org. Apache. http. Protocol. requesttargethost;
Import org. Apache. http. Protocol. requestuseragent;
Import org. Apache. http. util. entityutils;

/**
* Example of using httpclient to read a page
* @ Author old zizhu (java2000.net)
*
*/
Public class httpget {
Public static void main (string [] ARGs) throws exception {

Httpparams Params = new basichttpparams ();
// HTTP Protocol version, 1.1/1.0/0.9
Httpprotocolparams. setversion (Params, httpversion. http_1_1 );
// Character Set
Httpprotocolparams. setcontentcharset (Params, "UTF-8 ");
// Camouflage browser type
// IE7 is
// Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 6.0)
//
// Firefox3.03
// Mozilla/5.0 (windows; U; Windows NT 5.2; ZH-CN; RV: 1.9.0.3) Gecko/2008092417 Firefox/3.0.3
//
Httpprotocolparams. setuseragent (Params, "http: // 1.1 ");
Httpprotocolparams. setuseexpectcontinue (Params, true );

Basichttpprocessor httpproc = new basichttpprocessor ();

Httpproc. addinterceptor (New requestcontent ());
Httpproc. addinterceptor (New requesttargethost ());

Httpproc. addinterceptor (New requestconncontrol ());
Httpproc. addinterceptor (New requestuseragent ());
Httpproc. addinterceptor (New requestexpectcontinue ());

Httprequestexecutor httpexecutor = new httprequestexecutor ();

Httpcontext context = new basichttpcontext (null );
Httphost host = new httphost ("www.java2000.net", 80 );

Defaulthttpclientconnection conn = new defaulthttpclientconnection ();
Connectionreusestrategy connstrategy = new defaultconnectionreusestrategy ();

Context. setattribute (executioncontext. http_connection, Conn );
Context. setattribute (executioncontext. http_target_host, host );

Try {

String [] targets = {"/", "/help. jsp "};

For (INT I = 0; I <targets. length; I ++ ){
If (! Conn. isopen ()){
Socket socket = new socket (host. gethostname (), host. getport ());
Conn. BIND (socket, Params );
}
Basichttprequest request = new basichttprequest ("get", targets [I]);
System. Out. println ("> request URI:" + request. getrequestline (). geturi ());

Context. setattribute (executioncontext. http_request, request );
Request. setparams (Params );
Httpexecutor. preprocess (request, httpproc, context );
Httpresponse response = httpexecutor.exe cute (request, Conn, context );
Response. setparams (Params );
Httpexecutor. postprocess (response, httpproc, context );

// Return code
System. Out. println ("<response:" + response. getstatusline ());
// Returned file header information
Header [] HS = response. getallheaders ();
For (header H: HS ){
System. Out. println (H. getname () + ":" + H. getvalue ());
}
// Output the subject information
System. Out. println (entityutils. tostring (response. getentity ()));
System. Out. println ("================ ");
If (! Connstrategy. keepalive (response, context )){
Conn. Close ();
} Else {
System. Out. println ("connection kept alive ...");
}
}
} Finally {
Conn. Close ();
}
}
}

5. httpclient Chinese garbled Solution

By default, httpclient uses a ISO-8859-1 to read the content of an HTTP response. If the content contains Chinese characters, you have to use the ugly new string (Str. getbytes ("ISO-8859-1"), "GBK"); statement.

The solution is to use the following configuration.

Private Static final string content_charset = "GBK"; // character set used to read content from httpclient

Httpclient client = new httpclient ();
Client. getparams (). setparameter (httpmethodparams. http_content_charset, content_charset );

 

 

6. Example of httpclient 4 processing File Upload (multipartentity)

 

Import java. Io. file;
Import org. Apache. http. httpentity;
Import org. Apache. http. httpresponse;
Import org. Apache. http. Client. httpclient;
Import org. Apache. http. Client. Methods. httppost;
Import org. Apache. http. entity. Mime. multipartentity;
Import org. Apache. http. entity. Mime. content. filebody;
Import org. Apache. http. entity. Mime. content. stringbody;
Import org. Apache. http. impl. Client. defaulthttpclient;

/**
* Example of httpclient 4 processing File Upload (multipartentity). <br>
* The version of James mime4j 0.5 is required.
*
* @ Author Java century network (java2000.net, laozizhu.com)
*/
Public class httpclientmultipartformpost {
Public static void main (string [] ARGs) throws exception {
Httpclient = new defaulthttpclient ();
Httppost = new httppost ("http: // localhost ");
// A local file
Filebody bin = new filebody (new file ("D:/bimg1181.jpg "));
// A string
Stringbody comment = new stringbody ("a binary file of some kind ");
// Multi-part Entity
Multipartentity reqentity = new multipartentity ();
// Add
Reqentity. addpart ("bin", BIN );
Reqentity. addpart ("comment", comment );
// Set
Httppost. setentity (reqentity );
System. Out. println ("execution:" + httppost. getrequestline ());
Httpresponse response = httpclient.exe cute (httppost );
Httpentity resentity = response. getentity ();
System. Out. println ("----------------------------------------");
System. Out. println (response. getstatusline ());
If (resentity! = NULL ){
System. Out. println ("Return length:" + resentity. getcontentlength ());
}
If (resentity! = NULL ){
Resentity. consumecontent ();
}
}
}