HttpUtils用Post和Get带参数提交帮助类

前言

本文没有讲解，就是一个工具类HttpUtils，可直接使用！

	/**
	 * 发送GET请求
	 * 
	 * @param url
	 *            目的地址
	 * @param parameters
	 *            请求参数，Map类型。
	 * @return 远程响应结果
	 */
	public static String sendGet(String url, Map<String, String> parameters) {
		String result = "";
		BufferedReader in = null;// 读取响应输入流
		StringBuffer sb = new StringBuffer();// 存储参数
		String params = "";// 编码之后的参数
		try {
			// 编码请求参数
			if (parameters.size() == 1) {
				for (String name : parameters.keySet()) {
					sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8"));
				}
				params = sb.toString();
			} else {
				for (String name : parameters.keySet()) {
					sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8")).append("&");
				}
				String temp_params = sb.toString();
				params = temp_params.substring(0, temp_params.length() - 1);
			}
			String full_url = url + "?" + params;
			System.out.println(full_url);
			// 创建URL对象
			java.net.URL connURL = new java.net.URL(full_url);
			// 打开URL连接(建立了一个与服务器的tcp连接,并没有实际发送http请求！)
			URLConnection urlConnection=connURL.openConnection();
			java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) urlConnection;
			// 设置通用请求属性(如果已存在具有该关键字的属性，则用新值改写其值。)
			httpConn.setRequestProperty("Accept", "*/*");
			httpConn.setRequestProperty("Connection", "Keep-Alive");
			httpConn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
			// 建立实际的连接(远程对象变为可用。远程对象的头字段和内容变为可访问)
			httpConn.connect();
			// 响应头部获取
			Map<String, List<String>> headers = httpConn.getHeaderFields();
			// 遍历所有的响应头字段
			for (String key : headers.keySet()) {
				System.out.println(key + "\t：\t" + headers.get(key));
			}
			// 定义BufferedReader输入流来读取URL的响应,并设置编码方式
			in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));
			String line;
			// 读取返回的内容
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}

	/**
	 * 发送POST请求
	 * 
	 * @param url
	 *            目的地址
	 * @param parameters
	 *            请求参数，Map类型。
	 * @return 远程响应结果
	 */
	public static String sendPost(String url, Map<String, String> parameters) {
		String result = "";// 返回的结果
		BufferedReader in = null;// 读取响应输入流
		PrintWriter out = null;
		StringBuffer sb = new StringBuffer();// 处理请求参数
		String params = "";// 编码之后的参数
		try {
			// 编码请求参数
			if (parameters.size() == 1) {
				for (String name : parameters.keySet()) {
					sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8"));
				}
				params = sb.toString();
			} else {
				for (String name : parameters.keySet()) {
					sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8")).append("&");
				}
				String temp_params = sb.toString();
				params = temp_params.substring(0, temp_params.length() - 1);
			}
			// 创建URL对象
			java.net.URL connURL = new java.net.URL(url);
			// 打开URL连接
			java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL.openConnection();
			// 设置通用属性
			httpConn.setRequestProperty("Accept", "*/*");
			httpConn.setRequestProperty("Connection", "Keep-Alive");
			httpConn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
			// 设置POST方式
			httpConn.setDoInput(true);
			httpConn.setDoOutput(true);
			// 获取HttpURLConnection对象对应的输出流
			out = new PrintWriter(httpConn.getOutputStream());
			// 发送请求参数
			out.write(params);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应，设置编码方式
			in = new BufferedReader(new InputStreamReader(
					httpConn.getInputStream(), "UTF-8"));
			String line;
			// 读取返回的内容
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}