整理下工作中常用到的工具集

package com.ggeit.pay.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.ggeit.pay.config.WXPayConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.security.MessageDigest;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

@Service
public class WXPayUtil {
    
    
   
   private final static Logger logger = LoggerFactory.getLogger(WXPayUtil.class);

   /**
    * 微信map转json
    * 
    * @param data
    * @return
    */
   public static String wxMapToJson(Map<String, Object> data) {
    
    
      ObjectMapper mapper = new ObjectMapper();
      String mjson = null;
      try {
    
    
         mjson = mapper.writeValueAsString(data);
         logger.info("mjson = " + mjson);
      } catch (JsonProcessingException e) {
    
    
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
      return mjson;
   }

   /**
    * 微信json转map
    * 
    * @param json
    * @return
    */
   public static Map<String, Object> wxJsonToMapObj(String json) {
    
    
      ObjectMapper mapper = new ObjectMapper();
      Map<String, Object> map = new HashMap<String, Object>();
      try {
    
    
         map = mapper.readValue(json, Map.class);
      } catch (Exception e) {
    
    
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
      return map;
   }

   /**
    * 微信签名
    * 
    * @param data
    * @param key
    * @return
    */
   public static String wxgenerateSignature(Map<String, String> data, String key) throws Exception {
    
    
      Set<String> keySet = data.keySet();
      String[] keyArray = keySet.toArray(new String[keySet.size()]);
      Arrays.sort(keyArray);
      StringBuilder sb = new StringBuilder();
      for (String k : keyArray) {
    
    
         if (k.equals(WXPayConstants.FIELD_SIGN)) {
    
    
            continue;
         }
         // if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
         // sb.append(k).append("=").append(data.get(k).trim()).append("&");
         sb.append(k).append("=").append(data.get(k).trim()).append("&");
      }
      sb.append("key=").append(key);
      logger.info("sb = " + sb.toString());
      return wxMD5(sb.toString()).toUpperCase();
   }

   /**
    * 生成 MD5
    *
    * @param data
    *            待处理数据
    * @return MD5结果
    */
   public static String wxMD5(String data) throws Exception {
    
    
      java.security.MessageDigest md = MessageDigest.getInstance("MD5");
      byte[] array = md.digest(data.getBytes("UTF-8"));
      StringBuilder sb = new StringBuilder();
      for (byte item : array) {
    
    
         sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
      }
      return sb.toString().toUpperCase();
   }

   /**
    * 获取订单号
    * 
    * @return
    */
   public static String wxcreateOrderID() {
    
    
      return wxgetTime() + wxgetRandom(6);
   }

   /**
    * 获取时间
    * 
    * @param
    */
   public static String wxgetTime() {
    
    
      SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
      return df.format(System.currentTimeMillis());
   }

   /**
    * 格式化时间
    * @param format
    * @return
    */
   public static String getDateTime(String format) {
    
    
      Date now = new Date();
      SimpleDateFormat sd = new SimpleDateFormat(format);
      return sd.format(now);
   }
   /**
    * 格式化前一天
    * @param format
    * @return
    */
   public static String getBeforeDateTime(String format) {
    
    
      Calendar calendar = Calendar.getInstance();
      calendar.add(Calendar.DATE, -1); // 得到前一天
      Date date = calendar.getTime();
      SimpleDateFormat sd = new SimpleDateFormat(format);
      return sd.format(date);
   }
   /**
    * 改变时间字符串的格式
    * @param strTime
    * @param srcformat
    * @param desformat
    * @return
    */
   public static String formatStringTime(String strTime,String srcformat,String desformat) throws ParseException {
    
    
      String now = "";

      Date date = new SimpleDateFormat(srcformat).parse(strTime);
      now = new SimpleDateFormat(desformat).format(date);

      return now;
   }

   /**
    * 获取随机数
    * 
    * @return
    */
   public static String wxgetRandom(int len) {
    
    
      StringBuffer flag = new StringBuffer();
      String sources = "0123456789";
      Random rand = new Random();
      for (int j = 0; j < len; j++) {
    
    
         flag.append(sources.charAt(rand.nextInt(9)) + "");
      }
      return flag.toString();
   }

   /**
    * 获取随机数带字母
    * 
    * @param len
    * @return
    */
   public static String wxgetRandomPlus(int len) {
    
    
      StringBuffer flag = new StringBuffer();
      String sources = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
      Random rand = new Random();
      for (int j = 0; j < len; j++) {
    
    
         flag.append(sources.charAt(rand.nextInt(62)) + "");
      }
      return flag.toString();
   }

   /*
    * 金额元转分
    */
   public static String wxchangeY2F(String amount) {
    
    
      return BigDecimal.valueOf(new Double(amount).doubleValue()).multiply(new BigDecimal(100)).toString();
   }
   
   /**
    * 元转分 
    * 1.23-->123
    * 银联商务微信支付中，"分"为无小数点类型
    * @param amount
    * @return
    */
   public static String changeY2F(String amount) {
    
    
      BigDecimal price = BigDecimal.valueOf(new Double(amount)).multiply(new BigDecimal(100));
      DecimalFormat df2 =new DecimalFormat("#");  //定义分格式
       String str2 =df2.format(price); 
    return str2;
   }
   
   /**
    * 金额分转元
    */
   /**
    * 将字符串"分"转换成"元"（长格式），如：100分被转换为1.00元。
    * @param s
    * @return
    */
   public static String convertCent2Dollar(String s) {
    
    
       if("".equals(s) || s ==null){
    
    
           return "";
       }
       long l;
       if(s.length() != 0) {
    
    
           if(s.charAt(0) == '+') {
    
    
               s = s.substring(1);
           }
           l = Long.parseLong(s);
       } else {
    
    
           return "";
       }
       boolean negative = false;
       if(l < 0) {
    
    
           negative = true;
           l = Math.abs(l);
       }
       s = Long.toString(l);
       if(s.length() == 1) {
    
    
           return (negative ? ("-0.0" + s) : ("0.0" + s));
       }
       if(s.length() == 2) {
    
    
           return (negative ? ("-0." + s) : ("0." + s));
       }else {
    
    
           return (negative ? ("-" + s.substring(0, s.length() - 2) + "." + s
                   .substring(s.length() - 2)) : (s.substring(0,
                   s.length() - 2)
                   + "." + s.substring(s.length() - 2)));
       }
   }

   /**
    * 将字符串"分"转换成"元"（短格式），如：100分被转换为1元。
    * @param s
    * @return
    */
   public static String wxchangeF2Y(String s) {
    
    
       String ss = convertCent2Dollar(s);
       ss = "" + Double.parseDouble(ss);
       if(ss.endsWith(".0")) {
    
    
           return ss.substring(0, ss.length() - 2);
       }
       if(ss.endsWith(".00")) {
    
    
           return ss.substring(0, ss.length() - 3);
       }else {
    
    
           return ss;
       }
   }

   public static void main(String[] args) {
    
    
      String string  = changeY2F("0.08");
      System.out.println(string);
      String str2 = wxchangeY2F("0.08");
      System.out.println(str2);
   }

}