bladex/blade-common/src/main/java/org/springblade/common/utils/CommonUtil.java

package org.springblade.common.utils;

import org.apache.commons.lang.StringUtils;

import java.io.InputStream;
import java.math.BigDecimal;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

/**
 * 通用工具类
 *
 * @author Chill
 */
public class CommonUtil {

    public static String handleNull(Object obj) {
        if (null == obj) {
            return "";
        } else {
            return obj.toString().trim();
        }
    }

    public static String join(Object ...args){
        if(args!=null){
            if(args.length>2){
                List<String> list = Arrays.stream(args).limit(args.length - 1).map(CommonUtil::handleNull).collect(Collectors.toList());
                String split=handleNull(args[args.length-1]);
                return join(list, split);
            }else{
                return handleNull(args[0]);
            }
        }else {
            return "";
        }
    }

    public static String join(List<String>list, String split){
        StringBuilder sb = new StringBuilder();
        if(list != null && list.size() > 0){
            for(String str:list){
                if(StringUtils.isNotEmpty(str)){
                    sb.append(str).append(split);
                }
            }
            if(sb.length()>0 && StringUtils.isNotEmpty(split)){
                sb.delete(sb.length() - split.length(), sb.length());
            }
        }
        return sb.toString();
    }

    public static Matcher matcher(String regex, String value) {
        Pattern pattern = Pattern.compile(regex);
        return pattern.matcher(value);
    }

    /**
     * 根据OSS文件路径获取文件输入流
     */
    public static InputStream getOSSInputStream(String urlStr) throws Exception {
        //获取OSS文件流
        URL imageUrl = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
        return conn.getInputStream();
    }

    /**
     * 随机生成短信验证码
     * @param length 生成长度
     */
    public static String getCharAndNumber(int length) {
        StringBuilder val = new StringBuilder();

        Random random = new Random();
        for (int i = 0; i < length; i++) {
            String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
            if ("char".equalsIgnoreCase(charOrNum)) {
                int choice = random.nextInt(2) % 2 == 0 ? 65 : 97;
                val.append((char) (choice + random.nextInt(26)));
            } else {
                val.append(random.nextInt(10));
            }
        }
        return val.toString();
    }

    /**
     * 判断参数是否是数字
     * @param value 需要判断数据
     * @return 判断结果，数字则为true，反之false
     */
    public static boolean checkIsBigDecimal(Object value){
        try{
            if(StringUtils.isNotEmpty(String.valueOf(value))){
                new BigDecimal(String.valueOf(value));
                return true;
            } else {
                return false;
            }
        }catch (Exception e){
            return false;
        }
    }

    /**
     * 根据每页信息分组
     */
    public static <T> List<List<T>> getBatchSize(List<T> allIds, int size) {
        List<List<T>> batchIds = new ArrayList<>();
        if (allIds == null || allIds.size() == 0 ||  size <= 0) {
            return batchIds;
        }

        int i = 0;
        List<T> tmp = new ArrayList<>();
        for (T map : allIds) {
            tmp.add(map);
            i++;
            if (i % size == 0 || i ==  allIds.size()) {
                batchIds.add(tmp);
                tmp =  new ArrayList<>();
            }
        }
        return batchIds;
    }

}