package cn.core.util;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
public class HttpInvoker
{
public static
final String GET_URL
= "http://www.baidu.cn";
public static
final String POST_URL
= "http://www.baidu.cn";
public static
void readContentFromGet()
throws IOException{
//
拼凑get请求的URL字串，使用URLEncoder.encode对特殊和不可见字符进行编码
//String getURL
= GET_URL +
"?username=" +
URLEncoder.encode("fatman" ,"utf-8");
String
getURL = GET_URL;
URL getUrl
= new
URL(getURL);
//
根据拼凑的URL，打开连接，URL.openConnection函数会根据URL的类型，
//
返回不同的URLConnection子类的对象，这里URL是一个http，因此实际返回的是HttpURLConnection
HttpURLConnection connection
= (HttpURLConnection)
getUrl.openConnection();
//
进行连接，但是实际上get
request要在下一句的connection.getInputStream()函数中才会真正发到
//
服务器
connection.connect();
//
取得输入流，并使用Reader读取
BufferedReader reader
= new
BufferedReader( new
InputStreamReader(connection.getInputStream()));
System.out.println( "
============================= " );
System.out.println( "
Contents of get request " );
System.out.println( "
============================= " );
String lines;
while((lines
= reader.readLine())
!= null ){
System.out.println(lines);
}
reader.close();
connection.disconnect();
System.out.println( "
============================= " );
System.out.println( "
Contents of get request ends " );
System.out.println( "
============================= " );
}
public
static void
readContentFromPost() throws
IOException{
//
Post请求的url，与get不同的是不需要带参数
URL postUrl
= new
URL(POST_URL);
//
打开连接
HttpURLConnection connection
= (HttpURLConnection)
postUrl
.openConnection();
//
设置是否向connection输出，因为这个是post请求，参数要放在
//
http正文内，因此需要设为true
connection.setDoOutput( true
);
connection.setDoInput( true
);
//有的请求不支持POST请求
//connection.setRequestMethod( "POST" );
connection.setUseCaches(
false );
connection.setInstanceFollowRedirects( true );
//connection.setRequestProperty("Content-Type"
,"application/x-www-form-urlencoded");
connection.setRequestProperty("Content-Type" ,"text/html");
connection.connect();
//
DataOutputStream out =
new
DataOutputStream(connection.getOutputStream());
//
String content ="firstname=" +
URLEncoder.encode( "一个大肥人" ,
"utf-8" );
//
out.writeBytes(content);
//
out.flush();
//
out.close(); //
flush and close
BufferedReader reader
= new
BufferedReader( new
InputStreamReader(connection.getInputStream()));
String line;
System.out.println( "
============================= " );
System.out.println( "
Contents of post request " );
System.out.println( "
============================= " );
while
((line =
reader.readLine()) !=
null ){
System.out.println(line);
}
System.out.println( "
============================= " );
System.out.println( "
Contents of post request ends " );
System.out.println( "
============================= " );
reader.close();
connection.disconnect();
}
public static
void main(String[]
args){
//
TODO Auto-generated method
stub
try{
//readContentFromGet();
readContentFromPost();
}
catch (IOException e){
// TODO
Auto-generated catch block
e.printStackTrace();
}
}
}