Http 请求发送 （post get）及 响应 实例 （http://yymmiinngg.javaeye.com/blog/154258）

       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：

 

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：

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

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.youkuaiyun.com");
 
   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();
  }
 }
}