向指定url发送httprequest,get和post方式

package cn.server;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

public class HttpRequest {
	/**
	 * 向指定URL发送GET方法的请求
	 * 
	 * @param url
	 *            发送请求的URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return URL 所代表远程资源的响应结果
	 */
	public static String sendGet(String url, String param) {
		String result = "";
		BufferedReader in = null;
		try {
			String urlNameString = url + "?" + param;
			URL realUrl = new URL(urlNameString);
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用的请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
			connection.setRequestProperty("user-agent",
					"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 建立实际的连接
			connection.connect();
			// 获取所有响应头字段
			Map<String, List<String>> map = connection.getHeaderFields();
			// 遍历所有的响应头字段
			for (String key : map.keySet()) {
				System.out.println(key + "--->" + map.get(key));
			}
			// 定义 BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(
					connection.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.out.println("发送GET请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return result;
	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url
	 *            发送请求的 URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 */
	public static String sendPost(String url, String param) {
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			URLConnection conn = realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("Content-type", "application/json");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent",
					"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());
			// 发送请求参数
			out.print(param);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(
					new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			System.out.println("发送 POST 请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}

	public static void main(String[] args) {
		// 发送 GET 请求
		// String s = HttpRequest.sendGet(
		// "http://localhost:6144/Home/RequestString", "key=123&v=456");
		// System.out.println(s);

		// 发送 POST 请求
		String sr = HttpRequest
				.sendPost(
						"http://localhost:6144/Home/RequestString",
						"\u4e09\u5929\u7684\u4f53\u80b2\u57f9\u8bad\u5728\u8f7b\u677e\u6109\u60a6\u7684\u6c1b\u56f4\u4e2d\u7ed3\u675f\uff0c\u53c2\u8bad\u6559\u5e08\u5728\u5e0c\u671b\u4e5d\u6d32\u57f9\u8bad\u8001\u5e08\u7684\u5e26\u9886\u4e0b\uff0c\u5b66\u5230\u4e86\u66f4\u524d\u6cbf\u7684\u4f53\u80b2\u7406\u8bba\u77e5\u8bc6\u548c\u4f53\u80b2\u6d3b\u52a8\u5b9e\u8df5\u64cd\u4f5c\u8981\u9886\uff0c\u63d0\u9ad8\u4e86\u4e61\u6751\u5b66\u6821\u4f53\u80b2\u6559\u5b66\u8d28\u91cf\uff0c\u4e3a\u4e61\u6751\u513f\u7ae5\u7684\u8eab\u5fc3\u5065\u5eb7\u53d1\u80b2\u5960\u5b9a\u4e86\u575a\u5b9e\u7684\u57fa\u7840\u3002");
		System.out
				.println("\u4e09\u5929\u7684\u4f53\u80b2\u57f9\u8bad\u5728\u8f7b\u677e\u6109\u60a6\u7684\u6c1b\u56f4\u4e2d\u7ed3\u675f\uff0c\u53c2\u8bad\u6559\u5e08\u5728\u5e0c\u671b\u4e5d\u6d32\u57f9\u8bad\u8001\u5e08\u7684\u5e26\u9886\u4e0b\uff0c\u5b66\u5230\u4e86\u66f4\u524d\u6cbf\u7684\u4f53\u80b2\u7406\u8bba\u77e5\u8bc6\u548c\u4f53\u80b2\u6d3b\u52a8\u5b9e\u8df5\u64cd\u4f5c\u8981\u9886\uff0c\u63d0\u9ad8\u4e86\u4e61\u6751\u5b66\u6821\u4f53\u80b2\u6559\u5b66\u8d28\u91cf\uff0c\u4e3a\u4e61\u6751\u513f\u7ae5\u7684\u8eab\u5fc3\u5065\u5eb7\u53d1\u80b2\u5960\u5b9a\u4e86\u575a\u5b9e\u7684\u57fa\u7840\u3002");
		System.out.println(sr);

	}
}