HttpRequestUtil 接口請求

package net.joystart.common.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import com.google.gson.Gson;

import net.joystart.common.util.security.AES;

public class HttpRequestUtil {
    /**
     * 向指定URL發送GET方法的請求
     * 
     * @param url
     *            發送請求的URL
     * @param param
     *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
     * @return URL 所代表遠程資源的響應結果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        StringBuilder jsonStr = new StringBuilder();
        BufferedReader in = null;
        try {
            String urlNameString = url + param;
            URL realUrl = new URL(urlNameString);
            // 打開和URL之間的連接
            URLConnection connection = realUrl.openConnection();
            // 設置通用的請求屬性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立實際的連接
            connection.connect();
            // 獲取所有響應頭字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍歷所有的響應頭字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            
            //ConstantUtil.UTF_CODE 編碼格式
            InputStreamReader reader = new InputStreamReader(connection.getInputStream(), ConstantUtil.UTF_CODE);
            char[] buff = new char[1024];
            int length = 0;
            while ((length = reader.read(buff)) != -1) {
                result = new String(buff, 0, length);
                jsonStr.append(result);
            }
            
            
            Gson gson = new Gson();
            Map temp  = gson.fromJson("", Map.class);
            
        } catch (Exception e) {
            System.out.println("發送GET請求出現異常！" + e);
            e.printStackTrace();
        }
        // 使用finally塊來關閉輸入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return jsonStr.toString();
    }

    /**
     * 向指定 URL 發送POST方法的請求
     * 
     * @param url
     *            發送請求的 URL
     * @param param
     *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
     * @return 所代表遠程資源的響應結果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        URLConnection conn = null;
        StringBuilder jsonStr = new StringBuilder();
        try {
            URL realUrl = new URL(url);
            // 打開和URL之間的連接
            conn = realUrl.openConnection();
            conn.setConnectTimeout(20000);
            // 設置通用的請求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 發送POST請求必須設置如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection對象對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 發送請求參數
            out.print(param);
            // flush輸出流的緩沖
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            
            InputStreamReader reader = new InputStreamReader(conn.getInputStream(), ConstantUtil.UTF_CODE);
            char[] buff = new char[1024];
            int length = 0;
            while ((length = reader.read(buff)) != -1) {
                String result = new String(buff, 0, length);
                jsonStr.append(result);
            }
        } catch (Exception e) {
            System.out.println("發送 POST 請求出現異常！"+e);
            e.printStackTrace();
        }
        //使用finally塊來關閉輸出流、輸入流
        finally{
            try{    
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return jsonStr.toString();
    }    
}