HttpRequestHelper

package com.wenxin.utils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import java.util.List;import java.util.Map;import javax.net.ssl.HttpsURLConnection;import com.wenxin.model.AccessToken;import com.wenxin.model.Account;import com.wenxin.model.AuthUserInfo;public class HttpRequestUtis {    /**     * 向指定URL发送GET方法的请求     *      * @param url     *            发送请求的URL     * @return URL 所代表远程资源的响应结果     */    public static String sendGet(String url) {    StringBuffer buffer = new StringBuffer();        BufferedReader in = null;        try {            URL realUrl = new URL(url);            // 打开和URL之间的连接            //URLConnection connection = realUrl.openConnection();            HttpURLConnection httpUrlConn = (HttpURLConnection) 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)");            httpUrlConn.setRequestMethod("GET");            // 建立实际的连接            httpUrlConn.connect();            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();            httpUrlConn.disconnect();            inputStream = null;            System.out.println(buffer);        } 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 buffer.toString();    }    /**     * 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。     * @return 所代表远程资源的响应结果     */    public static String sendPost(String url, String param) {        PrintWriter out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            // 打开和URL之间的连接            URLConnection conn = realUrl.openConnection();            // 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)");            // 发送POST请求必须设置如下两行            conn.setDoOutput(true);            conn.setDoInput(true);            // 获取URLConnection对象对应的输出流            out = new PrintWriter(conn.getOutputStream());            // 发送请求参数            out.print(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) throws InstantiationException, IllegalAccessException {    String token = sendGet("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=wxb6046cd738463fbe&secret=45e5e0305ddee92705fd6399b2377fad");    System.out.println(token);    }}