Http請求get和post調用

工作中會遇到遠程調用接口，需要編寫Http請求的共通類

以下是自己總結的Http請求代碼

package com.gomecar.index.common.utils;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

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.nio.charset.Charset;
import java.util.*;

public class HttpUtils {

    /**
     * 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。
     * @param timeout 連接超時時間 /單位毫秒
     * @return URL 所代表遠程資源的響應結果
     */
    public static String sendGet(String url, String param,int timeout) {
        StringBuffer resultBuf = new StringBuffer();

        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("Content-Type", "application/x-www-form-urlencoded");
            connection.setConnectTimeout(timeout);
            // 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));
            // }
            // 定義 BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), Charset.forName("UTF-8")));
            String line;
            while ((line = in.readLine()) != null) {
                resultBuf.append(line);
            }
        } 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 resultBuf.toString();
    }

    public static String assemParam(Map<String, Object> param) {
        Set<String> keys = param.keySet();
        StringBuffer sb = new StringBuffer();
        for (Iterator<String> iter = keys.iterator(); iter.hasNext();) {
            String key = iter.next();
            sb.append(key);
            sb.append("=");
            sb.append(param.get(key));
            if (iter.hasNext()) {
                sb.append("&");
            }
        }
        return sb.toString();
    }

    /**
     * 向指定 URL 發送POST方法的請求
     *
     * @param url
     *            發送請求的 URL
     * @param req
     *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
     * @param timeout 連接超時時間 /單位毫秒
     * @return 所代表遠程資源的響應結果
     */
    public static String sendPost(String url, Map req,int timeout) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打開和URL之間的連接
            URLConnection conn = realUrl.openConnection();
            // 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)");
            conn.setRequestProperty("content-type", "text/json");
            conn.setRequestProperty("method","POST");
            // 發送POST請求必須設置如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setConnectTimeout(timeout);//連接超時時間
            // 獲取URLConnection對象對應的輸出流
            StringBuilder sb=new StringBuilder();
            Iterator<String> iterator = req.keySet().iterator();
            while (iterator.hasNext()) {
                String key=iterator.next().toString();
                String val=req.get(key).toString();
                sb.append(key);
                sb.append("=");
                sb.append(val);
                if (iterator.hasNext()) {
                    sb.append("&");
                }
            }


            out = new PrintWriter(conn.getOutputStream());
            // 發送請求參數
            out.print(sb);
            // flush輸出流的緩沖
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(),Charset.forName("utf-8")));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("發送 POST 請求出現異常！"+e+" url="+url+" param="+req+" time="+timeout);
            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 result;
    }

    /**
     * 向指定 URL 發送POST方法的請求
     *
     * @param url 發送請求的 URL
     * @param req 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 json) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打開和URL之間的連接
            URLConnection conn = realUrl.openConnection();
            // 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)");
            conn.setRequestProperty("content-type", "text/json");
            // 發送POST請求必須設置如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setConnectTimeout(5000);//連接超時時間
            // 獲取URLConnection對象對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 發送請求參數
            out.print(json);
            // flush輸出流的緩沖
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(), Charset.forName("utf-8")));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("發送 POST 請求出現異常！"+e+" url="+url);
            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 result;
    }

    public static void main(String[] args) {
        // http://10.144.48.82/mobile_api/serviceApi?method=product.ProductService.getGoodsInfo&skuNo=8001019816

        String re = new HttpUtils().sendGet("http://10.144.48.82/serviceApi",
                "method=product.getGoodsInfo&skuNo=8001019816",60);
        // System.out.println(re);
    }


    public String post(String url, String encoding, Map<String,String> map){
        boolean checkFlag = false;

        HttpPost post = null;
        DefaultHttpClient httpClient = new DefaultHttpClient();
        try {

            //String url = "http://localhost:8081/batchCates";//Constant.PERMISSION_URL;

            post = new HttpPost(url);
            List<BasicNameValuePair> postData = new ArrayList<BasicNameValuePair>();
            for (Map.Entry<String, String> entry : map.entrySet()) {
                postData.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
                //LOG.info(entry.getValue());
            }
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postData,encoding);
            post.setEntity(entity);
            HttpResponse response = httpClient.execute(post);
            //LOG.info(System.currentTimeMillis() - startTime);
            HttpEntity resEntiy = response.getEntity();
            String result = EntityUtils.toString(resEntiy);
           return result;


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

        return "";

    }

}