HTTP请求范例

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package com.grefr.basemethod;
/*JAVA发送HTTP请求，返回HTTP响应内容，实例及应用 博客分类： JAVA实现
Java.netBeanJDKApache .
JDK 中提供了一些对无状态协议请求（HTTP ）的支持，下面我就将我所写的一个小例子（组件）进行描述：

首先让我们先构建一个请求类（HttpRequester ）。

该类封装了 JAVA 实现简单请求的代码，如下： */


//Java代码
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.nio.charset.Charset; 
import java.util.Map; 
import java.util.Vector; 
  
/**
* HTTP请求对象
* 
* @author YYmmiinngg
*/
public class HttpRequester { 
    private String defaultContentEncoding; 
  
    public HttpRequester() { 
        this.defaultContentEncoding = Charset. defaultCharset().name(); 
    } 
  
    /**
     * 发送GET请求
     * 
     * @param urlString
     *            URL地址
     * @return 响应对象
     * @throws IOException
     */ 
    public HttpRespons sendGet(String urlString) throws IOException { 
        return this.send(urlString, "GET", null, null); 
    } 
  
    /**
     * 发送GET请求
     * 
     * @param urlString
     *            URL地址
     * @param params
     *            参数集合
     * @return 响应对象
     * @throws IOException
     */ 
    public HttpRespons sendGet(String urlString, Map params) 
            throws IOException { 
        return this.send(urlString, "GET", params, null); 
    } 
  
    /**
     * 发送GET请求
     * 
     * @param urlString
     *            URL地址
     * @param params
     *            参数集合
     * @param propertys
     *            请求属性
     * @return 响应对象
     * @throws IOException
     */ 
    public HttpRespons sendGet(String urlString, Map params, 
            Map propertys) throws IOException { 
        return this.send(urlString, "GET", params, propertys); 
    } 
  
    /**
     * 发送POST请求
     * 
     * @param urlString
     *            URL地址
     * @return 响应对象
     * @throws IOException
     */ 
    public HttpRespons sendPost(String urlString) throws IOException { 
        return this.send(urlString, "POST", null, null); 
    } 
  
    /**
     * 发送POST请求
     * 
     * @param urlString
     *            URL地址
     * @param params
     *            参数集合
     * @return 响应对象
     * @throws IOException
     */ 
    public HttpRespons sendPost(String urlString, Map params) 
            throws IOException { 
        return this.send(urlString, "POST", params, null); 
    } 
  
    /**
     * 发送POST请求
     * 
     * @param urlString
     *            URL地址
     * @param params
     *            参数集合
     * @param propertys
     *            请求属性
     * @return 响应对象
     * @throws IOException
     */ 
    public HttpRespons sendPost(String urlString, Map params, 
            Map propertys) throws IOException { 
        return this.send(urlString, "POST", params, propertys); 
    } 
  
    /**
     * 发送HTTP请求
     * 
     * @param urlString
     * @return 响映对象
     * @throws IOException
     */ 
    private HttpRespons send(String urlString, String method, 
            Map parameters, Map propertys) 
            throws IOException { 
        HttpURLConnection urlConnection = null; 
  
        if (method.equalsIgnoreCase("GET") && parameters != null) { 
            StringBuffer param = new StringBuffer(); 
            int i = 0; 
            for (String key : parameters.keySet()) { 
                if (i == 0) 
                    param.append( "?"); 
                else
                    param.append( "&"); 
                param.append(key).append("=" ).append(parameters.get(key)); 
                i++; 
            } 
            urlString += param; 
        } 
        URL url = new URL(urlString); 
        urlConnection = (HttpURLConnection) url.openConnection(); 
  
        urlConnection.setRequestMethod(method); 
        urlConnection.setDoOutput( true); 
        urlConnection.setDoInput( true); 
        urlConnection.setUseCaches( false); 
  
        if (propertys != null) 
            for (String key : propertys.keySet()) { 
                urlConnection.addRequestProperty(key, propertys.get(key)); 
            } 
  
        if (method.equalsIgnoreCase("POST") && parameters != null) { 
            StringBuffer param = new StringBuffer(); 
            for (String key : parameters.keySet()) { 
                param.append( "&"); 
                param.append(key).append("=" ).append(parameters.get(key)); 
            } 
            urlConnection.getOutputStream().write(param.toString().getBytes()); 
            urlConnection.getOutputStream().flush(); 
            urlConnection.getOutputStream().close(); 
        } 
  
        return this.makeContent(urlString, urlConnection); 
    } 
  
    /**
     * 得到响应对象
     * 
     * @param urlConnection
     * @return 响应对象
     * @throws IOException
     */ 
    private HttpRespons makeContent(String urlString, 
            HttpURLConnection urlConnection) throws IOException { 
        HttpRespons httpResponser = new HttpRespons(); 
        try { 
            InputStream in = urlConnection.getInputStream(); 
            BufferedReader bufferedReader = new BufferedReader( 
                    new InputStreamReader(in)); 
            httpResponser. contentCollection = new Vector(); 
            StringBuffer temp = new StringBuffer(); 
            String line = bufferedReader.readLine(); 
            while (line != null) { 
                httpResponser. contentCollection.add(line); 
                temp.append(line).append( "\r\n"); 
                line = bufferedReader.readLine(); 
            } 
            bufferedReader.close(); 
  
            String ecod = urlConnection.getContentEncoding(); 
            if (ecod == null) 
                ecod = this.defaultContentEncoding; 
  
            httpResponser. urlString = urlString; 
  
            httpResponser. defaultPort = urlConnection.getURL().getDefaultPort(); 
            httpResponser. file = urlConnection.getURL().getFile(); 
            httpResponser. host = urlConnection.getURL().getHost(); 
            httpResponser. path = urlConnection.getURL().getPath(); 
            httpResponser. port = urlConnection.getURL().getPort(); 
            httpResponser. protocol = urlConnection.getURL().getProtocol(); 
            httpResponser. query = urlConnection.getURL().getQuery(); 
            httpResponser. ref = urlConnection.getURL().getRef(); 
            httpResponser. userInfo = urlConnection.getURL().getUserInfo(); 
  
            httpResponser. content = new String(temp.toString().getBytes(), ecod); 
            httpResponser. contentEncoding = ecod; 
            httpResponser. code = urlConnection.getResponseCode(); 
            httpResponser. message = urlConnection.getResponseMessage(); 
            httpResponser. contentType = urlConnection.getContentType(); 
            httpResponser. method = urlConnection.getRequestMethod(); 
            httpResponser. connectTimeout = urlConnection.getConnectTimeout(); 
            httpResponser. readTimeout = urlConnection.getReadTimeout(); 
  
            return httpResponser; 
        } catch (IOException e) { 
            throw e; 
        } finally { 
            if (urlConnection != null) 
                urlConnection.disconnect(); 
        } 
    } 
  
    /**
     * 默认的响应字符集
     */ 
    public String getDefaultContentEncoding() { 
        return this.defaultContentEncoding; 
    } 
  
    /**
     * 设置默认的响应字符集
     */ 
    public void setDefaultContentEncoding(String defaultContentEncoding) { 
        this.defaultContentEncoding = defaultContentEncoding; 
    } 
}





/*其次我们来看看响应对象（HttpRespons ）。 响应对象其实只是一个数据BEAN ，由此来封装请求响应的结果数据，如下：
java代码  */
import java.util.Vector; 
  
/**
* 响应对象
*/
public class HttpRespons { 
  
    String urlString; 
  
   int defaultPort; 
 
   String file; 
 
   String host; 
 
   String path; 
 
   int port; 
 
   String protocol; 
 
   String query; 
 
   String ref; 
 
   String userInfo; 
 
   String contentEncoding; 
 
   String content; 
 
   String contentType; 
 
   int code; 
 
   String message; 
 
   String method; 
 
   int connectTimeout; 
 
   int readTimeout; 
 
   Vector contentCollection; 
 
   public String getContent() { 
       return content; 
   } 
 
   public String getContentType() { 
       return contentType; 
   } 
 
   public int getCode() { 
       return code; 
   } 
 
   public String getMessage() { 
       return message; 
   } 
 
   public Vector getContentCollection() { 
       return contentCollection; 
   } 
 
   public String getContentEncoding() { 
       return contentEncoding; 
   } 
 
   public String getMethod() { 
       return method; 
   } 
 
   public int getConnectTimeout() { 
       return connectTimeout; 
   } 
 
   public int getReadTimeout() { 
       return readTimeout; 
   } 
 
   public String getUrlString() { 
       return urlString; 
   } 
 
   public int getDefaultPort() { 
       return defaultPort; 
   } 
 
   public String getFile() { 
       return file; 
   } 
 
   public String getHost() { 
       return host; 
   } 
 
   public String getPath() { 
       return path; 
    } 
  
    public int getPort() { 
        return port; 
    } 
  
    public String getProtocol() { 
        return protocol; 
    } 
  
    public String getQuery() { 
        return query; 
    } 
  
    public String getRef() { 
        return ref; 
    } 
  
    public String getUserInfo() { 
        return userInfo; 
    } 
  
}
import java.util.Vector;

*//**
* 响应对象
*//*
public class HttpRespons {

      String urlString;

       int defaultPort;

      String file;

      String host;

      String path;

       int port;

      String protocol;

      String query;

      String ref;

      String userInfo;

      String contentEncoding;

      String content;

      String contentType;

       int code;

      String message;

      String method;

       int connectTimeout;

       int readTimeout;

      Vector contentCollection;

       public String getContent() {
             return content;
      }

       public String getContentType() {
             return contentType;
      }

       public int getCode() {
             return code;
      }

       public String getMessage() {
             return message;
      }

       public Vector getContentCollection() {
             return contentCollection;
      }

       public String getContentEncoding() {
             return contentEncoding;
      }

       public String getMethod() {
             return method;
      }

       public int getConnectTimeout() {
             return connectTimeout;
      }

       public int getReadTimeout() {
             return readTimeout;
      }

       public String getUrlString() {
             return urlString;
      }

       public int getDefaultPort() {
             return defaultPort;
      }

       public String getFile() {
             return file;
      }

       public String getHost() {
             return host;
      }

       public String getPath() {
             return path;
      }

       public int getPort() {
             return port;
      }

       public String getProtocol() {
             return protocol;
      }

       public String getQuery() {
             return query;
      }

       public String getRef() {
             return ref;
      }

       public String getUserInfo() {
             return userInfo;
      }

}




最后，让我们写一个应用类，测试以上代码是否正确

Java代码
import com.yao.http.HttpRequester; 
import com.yao.http.HttpRespons; 
  
public class Test { 
    public static void main(String[] args) { 
        try { 
            HttpRequester request = new HttpRequester(); 
            HttpRespons hr = request.sendGet( "http://www.csdn.net"); 
 
            System. out.println(hr.getUrlString()); 
            System. out.println(hr.getProtocol()); 
            System. out.println(hr.getHost()); 
            System. out.println(hr.getPort()); 
            System. out.println(hr.getContentEncoding()); 
            System. out.println(hr.getMethod()); 
             
            System. out.println(hr.getContent()); 
  
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
}