Java工具类——发送GET/POST请求工具

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;

/**
 * Java HTTP请求对象 发送GET/POST请求工具类
 */
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 地址
	 * @param method  get/post
	 * @param parameters  添加由键值对指定的请求参数
	 * @param propertys  添加由键值对指定的一般请求属性
	 * @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;
	}
}

转自【http://www.open-open.com/lib/view/open1374585832808.html】