访问URL

三种访问url的方式

package com.urldemo.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.nio.Buffer;
import java.nio.channels.Pipe;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.swing.text.html.parser.Entity;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class URLUtil {
    /**
     * 
     *  1、 
     */
    public static String SendURLAndParam(String url, String method, String param) {
        String res = "";
        BufferedReader reader = null;
        try {
            // 1、获取真正的url
            // url = url+"?";
//            param = URLEncoder.encode(param);// url编码  不是必须,看具体 接口需要
            URL realUrl = new URL(url + "?" + param);// 没有param url跟上？也不会出错
            // 2、获取url链接
            URLConnection conn = realUrl.openConnection();
            // 3、设置链接属性
            // Http报头分为通用报头，请求报头，响应报头和实体报头。
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Method", method);// GET还是POST
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");// 用户代理
            // 4、建立连接，发送请求
            conn.connect();
            // 5、获取所有响应头字段
            Map<String, List<String>> map = conn.getHeaderFields();
            // 6、遍历所有响应头字段，获取到 cooies等
            for (String key : map.keySet()) {
                System.out.println(key + "-->" + map.get(key));
            }
            // 7、定义BufferedReader 输入流来读取 URL的响应
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;// 循环读取
            while ((line = reader.readLine()) != null) {
                res += line;
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {// 关闭流
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return res;
    }
    /**
     * 
     *   2、
     * @return
     */
    static public String sendHttpURLAndData(String postData, String postUrl) {

        try {
            URL url = new URL(postUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setUseCaches(false);
            conn.setDoOutput(true);

            conn.setRequestProperty("Content-Length", "" + postData.length());
            OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            out.write(postData);
            out.flush();
            out.close();

            if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
                return "";
            }
            String line, result = "";
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            while ((line = in.readLine()) != null) {
                result += line + "
";
            }
            in.close();
            return result;
        } catch (Exception e) {
        }
        return "";
    }

    /**
     * 
     * 3、使用httpclient进行访问，需要是到 http://hc.apache.org/下载jar包
     * 
     * @param url
     * @return
     */
    static public String callOnHttp(String url) {
        String address = "";
        CloseableHttpClient httpClient = HttpClients.createDefault();

        try {
            HttpGet httpGet = new HttpGet(url);
            ResponseHandler<String> responseHandler = new ResponseHandler<String>() {

                @Override
                public String handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                        HttpEntity entity = response.getEntity();
                        return entity != null ? EntityUtils.toString(entity) : null;
                    } else {
                        throw new ClientProtocolException("Unexpected response status:" + status);
                    }

                }
            };
            address = httpClient.execute(httpGet, responseHandler);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        return address;
    }

    static public String getWeather(String url, String apiKey, String city) {
        String param = "key=" + apiKey + "&city=" + city;
        String result = SendURLAndParam(url, "GET", param);
        return result;
    }
static public void SMS(String url,String apiKey,int tplid,String tel,String wd) throws UnsupportedEncodingException {
         //String   text1  =   java.net.URLEncoder.encode("中国",   "utf-8");   
        　　 //String   text2   =   java.net.URLDecoder.decode(text1,   "utf-8");   
    wd = URLEncoder.encode(wd,"UTF-8");//url编码 不是必须 看具体接口需要
    String param = "key="+apiKey+"&tplid="+tplid+"&tel="+tel+"&wd="+wd;

    SendURLAndParam(url, "GET",param);
}
    public static void main(String[] args) throws UnsupportedEncodingException {
//        String weather = getWeather("http://api.91cha.com/weather", "8c5abe8df3574e23b73aeb51c1efb667", "北京");
//        System.out.println(weather);
        SMS("http://api.91cha.com/sms","64cff0922cbb4c6896dec8dc76884866",1,"18734741443","#code#=1265");
//        http://api.91cha.com/sms?key=64cff0922cbb4c6896dec8dc76884866&tplid=1&tel=18734741443&wd=#code#=1265
    }
}