Java send HTTP GET, POST request [go]

Original link: http://www.cnblogs.com/zhuawang/archive/2012/12/08/2809380.html

Package Wzh. Http;

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;

public class HttpRequest {
/**
* Request to send a GET method to the specified URL
*
* @param URL
* Send the requested URL
* @param param
* Request parameters, request parameters should be in the form of name1=value1&name2=value2.
* @return The response result of the remote resource represented by the URL
*/
public static string Sendget (string url, string param) {
String result = "";
BufferedReader in = null;
try {
String urlnamestring = URL + "?" + param;
URL realurl = new URL (urlnamestring);
Opening and linking between URLs
URLConnection connection = Realurl.openconnection ();
To set common request properties
Connection.setrequestproperty ("Accept", "*/*");
Connection.setrequestproperty ("Connection", "keep-alive");
Connection.setrequestproperty ("User-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ");
Establish an actual connection
Connection.connect ();
Get all response header fields
map<string, list<string>> map = Connection.getheaderfields ();
Iterate through all the response header fields
For (String Key:map.keySet ()) {
SYSTEM.OUT.PRINTLN (key + "--->" + map.get (key));
}
Defines the response of the BufferedReader input stream to read the URL
in = new BufferedReader (New InputStreamReader (
Connection.getinputstream ()));
String Line;
while (line = In.readline ()) = null) {
result + = line;
}
} catch (Exception e) {
SYSTEM.OUT.PRINTLN ("Send GET request exception!") "+ e);
E.printstacktrace ();
}
Use the finally block to close the input stream
finally {
try {
if (in = null) {
In.close ();
}
} catch (Exception E2) {
E2.printstacktrace ();
}
}
return result;
}

/**
* Request to send the Post method to the specified URL
*
* @param URL
* Send the requested URL
* @param param
* Request parameters, request parameters should be in the form of name1=value1&name2=value2.
* @return The response result of the remote resource represented
*/
public static string Sendpost (string url, string param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realurl = new URL (URL);
Opening and linking between URLs
URLConnection conn = Realurl.openconnection ();
To set common request properties
Conn.setrequestproperty ("Accept", "*/*");
Conn.setrequestproperty ("Connection", "keep-alive");
Conn.setrequestproperty ("User-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ");
To send a POST request, you must set 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 parameters
Out.print (param);
Buffer for flush output stream
Out.flush ();
Defines the response of the BufferedReader input stream to read 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;
}
}

Java send HTTP GET, POST request [go]