JAVA发送HTTP请求的四种方式总结

package httpURLConnection;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpURLConnectionHelper {

  public static String sendRequest(String urlParam,String requestType) {

   HttpURLConnection con = null ;

   BufferedReader buffer = null ;

   StringBuffer resultBuffer = null ;

   try {

    URL url = new URL(urlParam);

    //得到连接对象

    con = (HttpURLConnection) url.openConnection();

    //设置请求类型

    con.setRequestMethod(requestType);

    //设置请求需要返回的数据类型和字符集类型

    con.setRequestProperty( "Content-Type" , "application/json;charset=GBK" );

    //允许写出

    con.setDoOutput( true );

    //允许读入

    con.setDoInput( true );

    //不使用缓存

    con.setUseCaches( false );

    //得到响应码

    int responseCode = con.getResponseCode();

    if (responseCode == HttpURLConnection.HTTP_OK){

     //得到响应流

     InputStream inputStream = con.getInputStream();

     //将响应流转换成字符串

     resultBuffer = new StringBuffer();

     String line;

     buffer = new BufferedReader( new InputStreamReader(inputStream, "GBK" ));

     while ((line = buffer.readLine()) != null ) {

      resultBuffer.append(line);

     }

     return resultBuffer.toString();

    }

   } catch (Exception e) {

    e.printStackTrace();

   }

   return "" ;

  }

  public static void main(String[] args) {

   String url = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=120.79.75.96" ;

   System.out.println(sendRequest(url, "POST" ));

  }

}

package uRLConnection;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLConnection;

public class URLConnectionHelper {

  public static String sendRequest(String urlParam) {

   URLConnection con = null ;

   BufferedReader buffer = null ;

   StringBuffer resultBuffer = null ;

   try {

     URL url = new URL(urlParam);

     con = url.openConnection();

    //设置请求需要返回的数据类型和字符集类型

    con.setRequestProperty( "Content-Type" , "application/json;charset=GBK" );

    //允许写出

    con.setDoOutput( true );

    //允许读入

    con.setDoInput( true );

    //不使用缓存

    con.setUseCaches( false );

    //得到响应流

    InputStream inputStream = con.getInputStream();

    //将响应流转换成字符串

    resultBuffer = new StringBuffer();

    String line;

    buffer = new BufferedReader( new InputStreamReader(inputStream, "GBK" ));

    while ((line = buffer.readLine()) != null ) {

     resultBuffer.append(line);

    }

    return resultBuffer.toString();

   } catch (Exception e) {

    e.printStackTrace();

   }

   return "" ;

  }

  public static void main(String[] args) {

   String url = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=120.79.75.96" ;

   System.out.println(sendRequest(url));

  }

}

<!-- https: //mvnrepository.com/artifact/commons-httpclient/commons-httpclient -->

<dependency>

  <groupId>commons-httpclient</groupId>

  <artifactId>commons-httpclient</artifactId>

  <version> 3.1 </version>

</dependency

package httpClient;

import java.io.IOException;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.HttpException;

import org.apache.commons.httpclient.methods.GetMethod;

import org.apache.commons.httpclient.methods.PostMethod;

import org.apache.commons.httpclient.params.HttpMethodParams;

public class HttpClientHelper {

  public static String sendPost(String urlParam) throws HttpException, IOException {

   // 创建httpClient实例对象

   HttpClient httpClient = new HttpClient();

   // 设置httpClient连接主机服务器超时时间：15000毫秒

   httpClient.getHttpConnectionManager().getParams().setConnectionTimeout( 15000 );

   // 创建post请求方法实例对象

   PostMethod postMethod = new PostMethod(urlParam);

   // 设置post请求超时时间

   postMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000 );

   postMethod.addRequestHeader( "Content-Type" , "application/json" );

   httpClient.executeMethod(postMethod);

   String result = postMethod.getResponseBodyAsString();

   postMethod.releaseConnection();

   return result;

  }

  public static String sendGet(String urlParam) throws HttpException, IOException {

   // 创建httpClient实例对象

   HttpClient httpClient = new HttpClient();

   // 设置httpClient连接主机服务器超时时间：15000毫秒

   httpClient.getHttpConnectionManager().getParams().setConnectionTimeout( 15000 );

   // 创建GET请求方法实例对象

   GetMethod getMethod = new GetMethod(urlParam);

   // 设置post请求超时时间

   getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000 );

   getMethod.addRequestHeader( "Content-Type" , "application/json" );

   httpClient.executeMethod(getMethod);

   String result = getMethod.getResponseBodyAsString();

   getMethod.releaseConnection();

   return result;

  }

  public static void main(String[] args) throws HttpException, IOException {

   String url = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=120.79.75.96" ;

   System.out.println(sendPost(url));

   System.out.println(sendGet(url));

  }

}

package socket;

import java.io.BufferedInputStream;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.net.Socket;

import java.net.URLEncoder;

import javax.net.ssl.SSLSocket;

import javax.net.ssl.SSLSocketFactory;

public class SocketForHttpTest {

  private int port;

  private String host;

  private Socket socket;

  private BufferedReader bufferedReader;

  private BufferedWriter bufferedWriter;

  public SocketForHttpTest(String host, int port) throws Exception{

   this .host = host;

   this .port = port;

   /**

    * http协议

    */

   // socket = new Socket(this.host, this.port);

   /**

    * https协议

    */

   socket = (SSLSocket)((SSLSocketFactory)SSLSocketFactory.getDefault()).createSocket( this .host, this .port);

  }

  public void sendGet() throws IOException{

   //String requestUrlPath = "/z69183787/article/details/17580325";

   String requestUrlPath = "/" ;  

   OutputStreamWriter streamWriter = new OutputStreamWriter(socket.getOutputStream());

   bufferedWriter = new BufferedWriter(streamWriter);   

   bufferedWriter.write( "GET " + requestUrlPath + " HTTP/1.1\r\n" );

   bufferedWriter.write( "Host: " + this .host + "\r\n" );

   bufferedWriter.write( "\r\n" );

   bufferedWriter.flush();

   BufferedInputStream streamReader = new BufferedInputStream(socket.getInputStream());

   bufferedReader = new BufferedReader( new InputStreamReader(streamReader, "utf-8" ));

   String line = null ;

   while ((line = bufferedReader.readLine())!= null ){

    System.out.println(line);

   }

   bufferedReader.close();

   bufferedWriter.close();

   socket.close();

  }

  public void sendPost() throws IOException{

    String path = "/" ;

    String data = URLEncoder.encode( "name" , "utf-8" ) + "=" + URLEncoder.encode( "张三" , "utf-8" ) + "&" +

       URLEncoder.encode( "age" , "utf-8" ) + "=" + URLEncoder.encode( "32" , "utf-8" );

    // String data = "name=zhigang_jia";

    System.out.println( ">>>>>>>>>>>>>>>>>>>>>" +data);   

    OutputStreamWriter streamWriter = new OutputStreamWriter(socket.getOutputStream(), "utf-8" );

    bufferedWriter = new BufferedWriter(streamWriter);    

    bufferedWriter.write( "POST " + path + " HTTP/1.1\r\n" );

    bufferedWriter.write( "Host: " + this .host + "\r\n" );

    bufferedWriter.write( "Content-Length: " + data.length() + "\r\n" );

    bufferedWriter.write( "Content-Type: application/x-www-form-urlencoded\r\n" );

    bufferedWriter.write( "\r\n" );

    bufferedWriter.write(data);

    bufferedWriter.write( "\r\n" );

    bufferedWriter.flush();

    BufferedInputStream streamReader = new BufferedInputStream(socket.getInputStream());

    bufferedReader = new BufferedReader( new InputStreamReader(streamReader, "utf-8" ));

    String line = null ;

    while ((line = bufferedReader.readLine())!= null )

    {

     System.out.println(line);

    }

    bufferedReader.close();

    bufferedWriter.close();

    socket.close();

  }

  public static void main(String[] args) throws Exception {

   /**

    * http协议测试

    */

   //SocketForHttpTest forHttpTest = new SocketForHttpTest("www.baidu.com", 80);

   /**

    * https协议测试

    */

   SocketForHttpTest forHttpTest = new SocketForHttpTest( "www.baidu.com" , 443 );

   try {

    forHttpTest.sendGet();

   // forHttpTest.sendPost();

   } catch (IOException e) {

    e.printStackTrace();

   }

  }

}