[TOC]

Http通讯Util，可以通过请求参数为jsonstring来通讯，也可以把请求参数放在request中进行通讯

HttpUtil类

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;


public class HttpUtil {

    /**
     * 向指定URL发送GET方法的请求，参数都放在HttpRequestServlet request的内容中
     * @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) {
        String result = "";
        BufferedReader in = null;
        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();
            // 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("【HTTP发送GET请求出现异常】:访问URL："+url+",错误："+e.getMessage());
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                System.out.println("【HTTP请求关闭输入流异常】:访问URL："+url+",错误："+e2.getMessage());
            }
        }
        return result;
    }



    /**
     * 通过一个jsonString参数来传递数据，POST请求
     * 请求地址的接口的参数必须为String data
     * @param json
     * @param urls
     * @return
     */
    public static  String jsonPost(String urls,String json) {
        OutputStream out = null;
        BufferedReader inputStreamReader = null;
        StringBuffer buffer=null;
        try {
            URL url = new URL(urls);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setUseCaches(false);
            connection.setConnectTimeout(20000);
            connection.setReadTimeout(20000);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestMethod("POST"); // 设置请求方式
            connection.setRequestProperty("Accept-Charset", "utf-8"); // 设置接收数据的格式
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); // 设置发送数据的格式
            connection.connect();
            out = connection.getOutputStream();
            String pushData = "data="+json;
            out.write(pushData.getBytes("UTF-8"));
            out.flush();
            out.close();
            //获取响应
            inputStreamReader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
            // 读取响应
            buffer = new StringBuffer();
            String data= new String("");
            while ((data = inputStreamReader.readLine()) != null) {
                buffer.append(data);
            }
            while ((data = inputStreamReader.readLine()) != null) {
                buffer.append(data);
            }
        }catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                if(inputStreamReader != null){
                    inputStreamReader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return buffer.toString();
    }

    
}