常用工具类

1.发送post请求，传输json数据

package net.shopxx.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import okhttp3.OkHttpClient;

public class HttpRequestUtil {
    
    public static JSONObject doPost(String url, JSONObject json){

        CloseableHttpClient httpclient = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost(url);
        JSONObject response = null;
        try {
            StringEntity s = new StringEntity(json.toString());
            s.setContentEncoding("UTF-8");
            s.setContentType("application/json");//发送json数据需要设置contentType
            post.setEntity(s);
            HttpResponse res = httpclient.execute(post);
            if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
                String result = EntityUtils.toString(res.getEntity());// 返回json格式：
                response = JSON.parseObject(result);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        System.out.println(response);
        return response;
    }

    public static void main(String[] args) {
        //String url="http://www.laotinghuagong.com/event/online";
        String url="http://localhost:8083/gdsk/event.do?online";
        //appid=190920753389&sign=82D51AB250C38800B70B2F82440464DB&imei=363620190803947
        //&msgId=dadf7a7fd3454e5facde2d450957a275&type=wifi&address=23423423234&time=2156633&lng=119.3255211&lat=39.552455
        JSONObject jsondata=new JSONObject();
        jsondata.put("appid", "190920753389");
        jsondata.put("sign", "82D51AB250C38800B70B2F82440464DB");
        jsondata.put("imei", "363620190803947");
        jsondata.put("msgId", "dadf7a7fd3454e5facde2d450957a275");
//        jsondata.put("type", "wifi");
//        jsondata.put("address", "23423423234");
//        jsondata.put("time", "2156633");
//        jsondata.put("lng", "119.3255211");
//        jsondata.put("lat", "39.552455");
        //
        JSONObject doPost = doPost(url, jsondata);
    }
}

 2.微信签名 其中Key为签名

    /**
     * 微信支付签名算法sign
     * @param characterEncoding
     * @param parameters
     * @return
     */
    @SuppressWarnings("unchecked")
    public static String createSign(String characterEncoding,SortedMap<Object,Object> parameters){
        StringBuffer sb = new StringBuffer();
        Set es = parameters.entrySet();//所有参与传参的参数按照accsii排序（升序）
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            Object v = entry.getValue();
            if(null != v && !"".equals(v) 
                    && !"sign".equals(k) && !"key".equals(k)) {
                sb.append(k + "=" + v + "&");
            }
        }
        sb.append("key=" + Key);
        String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
        return sign;
    }

MD5

package com.jeecg.util;

import java.security.MessageDigest;

public class MD5Util {
    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));
 
        return resultSb.toString();
    }
 
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }
 
    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }
 
    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
        "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
}