HTTP请求范例

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<String, String> 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<String, String> params, 

            Map<String, String> 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<String, String> 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<String, String> params, 

            Map<String, String> 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<String, String> parameters, Map<String, String> 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<String>(); 

            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<String> contentCollection; 

 

   public String getContent() { 

       return content; 

   } 

 

   public String getContentType() { 

       return contentType; 

   } 

 

   public int getCode() { 

       return code; 

   } 

 

   public String getMessage() { 

       return message; 

   } 

 

   public Vector<String> 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<String> contentCollection;

public String getContent() {

             return content;

      }

public String getContentType() {

             return contentType;

      }

public int getCode() {

             return code;

      }

public String getMessage() {

             return message;

      }

public Vector<String> 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(); 

        } 

    } 

}