HTTP请求工具类详解-优快云博客

package com.xx.gmap.util;

/**
 * Created by zhangmy on 2017/6/16.
 */

import com.wdletu.gmap.dto.TipDTO;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import java.io.*;
import java.net.*;

/**
 * Http请求工具类
 */
public class HttpRequestUtil {
    final static boolean proxySet = false;//是否使用代理模式
    final static String proxyHost = "127.0.0.1";//代理ip
    final static int proxyPort = 8087;//代理端口

    /**
     * 编码
     *
     * @param source
     * @return
     */
    public static String urlEncode(String source, String encode) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source, encode);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return "0";
        }
        return result;
    }

    public static String urlEncodeUTF8(String source) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return "0";
        }
        return result;
    }

    /**
     * 发起http请求获取返回结果
     *
     * @param req_url 请求地址
     * @return
     */
    public static String httpRequest(String req_url) {
        StringBuffer buffer = new StringBuffer();
        try {
            URL url = new URL(req_url);
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();

            httpUrlConn.setDoOutput(false);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);

            httpUrlConn.setRequestMethod("GET");
            httpUrlConn.connect();

            // 将返回的输入流转换成字符串
            InputStream inputStream = httpUrlConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            httpUrlConn.disconnect();

        } catch (Exception e) {
            System.out.println(e.getStackTrace());
        }
        return buffer.toString();
    }

    /**
     * 发送http请求取得返回的输入流
     *
     * @param requestUrl 请求地址
     * @return InputStream
     */
    public static InputStream httpRequestIO(String requestUrl) {
        InputStream inputStream = null;
        try {
            URL url = new URL(requestUrl);
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
            httpUrlConn.setDoInput(true);
            httpUrlConn.setRequestMethod("GET");
            httpUrlConn.connect();
            // 获得返回的输入流
            inputStream = httpUrlConn.getInputStream();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return inputStream;
    }


    /**
     * 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, int count) {
        String result = "";
        BufferedReader in = null;
        final int maxCount = 5;
        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();
            */
            // 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();
            count++;
            if (count <= maxCount) {
                sendGet(url, param, count);
            }
        } 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。
     * @param isProxy 是否使用代理模式
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param, boolean isProxy) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = null;
            if (isProxy) {//使用代理模式
                @SuppressWarnings("static-access")
                Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
                conn = (HttpURLConnection) realUrl.openConnection(proxy);
            } else {
                conn = (HttpURLConnection) realUrl.openConnection();
            }
            // 打开和URL之间的连接

            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");    // POST方法


            // 设置通用的请求属性

            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", "application/x-www-form-urlencoded");

            conn.connect();

            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            // 发送请求参数
            out.write(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) {
        String actionUrl = "http://restapi.amap.com/v3/assistant/inputtips?parameters".replace("?parameters", "");

        //String params = "key=" + "e4fa66f17e614fa255e8a87348847da1" + "&keywords=" + "北京" + "&city=null" + "&datatype=" + "poi" + "&citylimit=true";
        String params = "key=e4fa66f17e614fa255e8a87348847da1&keywords=商都路&city=null&datatype=poi&citylimit=false";
        String sr = HttpRequestUtil.sendGet(actionUrl, params, 0);
        JSONObject obj = JSONObject.fromObject(sr);
        //JSONObject obj = new JSONObject(sr.toString());
        JSONArray obj2 = obj.getJSONArray("tips");
        for (int i = 0; i < obj2.size(); i++) {

            JSONObject temp = obj2.getJSONObject(i);
            String id = temp.getString("id");
            String name = temp.getString("name");
            String district = temp.getString("district");
            String adcode = temp.getString("adcode");
            String location = temp.getString("location");
            String address = temp.getString("address").replace("[]", "");
            String typecode = temp.getString("typecode");
            TipDTO tipDTO = new TipDTO(id, name, district, adcode, location, address, typecode);
            System.out.println(tipDTO);
            /*System.out.println(JsonUtils.toObject(temp.toString(), TipDTO.class));*/

        }
        /*System.out.println(JsonUtils.toObject(sr, TipsResultDTO.class));*/
    }

}