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");
StringgetURL = 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getrequest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 methodstub
try{
//readContentFromGet();
readContentFromPost();
} catch (IOException e){
// TODOAuto-generated catch block
e.printStackTrace();
}
}
}
