import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;
import java.util.List;
import java.util.Map;

import javax.print.attribute.standard.DateTimeAtCompleted;

public class GetResponse {
    /**
     * 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;
            System.out.println("读取响应：" + urlNameString);
            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/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36");
            // 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;
    }

    public static void main(String[] args) {
        Date currenttime = new Date();
        String url = "http://xxx.com";
        String result = "";
        for (int i = 0; i < 10; i++) {
            if (result.equals("")) {
                currenttime = new Date();
                result = sendGet(url, currenttime.getTime() + "");
            }
        }
        System.out.println(result);
        String[] result2 = result.split("=");
        System.out.println(result2[1]);
        System.out.println();
        try {

            File file = new File("goldprice.txt");

            // If file doesnt exists, then create it
            if (!file.exists()) {
                file.createNewFile();
            }

            // true = append file
            FileWriter fileWritter = new FileWriter(file.getName(), true);
            BufferedWriter bufferWritter = new BufferedWriter(fileWritter);
            bufferWritter.write(currenttime + result2[2].replace("|", "\t"));
            bufferWritter.newLine();
            bufferWritter.close();

            System.out.println("Done");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

java GetResponse > main.log