list 分批导入db, 每1000条数据一批 , 从字符串中获取数字,小数, 版本号比较

//这个有个弊端: 分组后分批导入, 是阻塞的,我没有导入完成,别人就不能导入, 这里可以优化成异步,线程池

public static void main(String[] args) {

Random random = new Random();

ArrayList phoneList = new ArrayList<>();

for (int i = 0; i < 30; i++) {

phoneList.add(i);

}

    for (int i = 0; i < phoneList.size(); i+=50) {
        //每50条数据一批
        List<Integer> collect = phoneList.stream().skip(i).limit(50).collect(Collectors.toList());
        System.out.println(collect.size());
        //执行入库操作
    }
}

版本号比较

public static boolean isHigherTargetVersion(String sourceVersion, String targetVersion){
    if("".equals(sourceVersion.trim()) || null == sourceVersion){
        return Boolean.FALSE;
    }
    if("".equals(targetVersion.trim()) || null == targetVersion){
        return Boolean.TRUE;
    }
    String[] sourceVersionSplit = sourceVersion.split("\\.");
    String[] targetVersionSplit = targetVersion.split("\\.");

    int minlenhgt = sourceVersionSplit.length > targetVersionSplit.length ? targetVersionSplit.length : sourceVersionSplit.length;

    for(int i = 0;i < minlenhgt; i++){
        Integer sourceTempVersion = Integer.parseInt(sourceVersionSplit[i]);
        Integer targetTempVersion = Integer.parseInt(targetVersionSplit[i]);
        if(sourceTempVersion.intValue() == targetTempVersion.intValue()){
            continue;
        }
        return sourceTempVersion > targetTempVersion;
    }
    return sourceVersionSplit.length >= targetVersionSplit.length;
}
// 从字符串中获取数字
public static String stringFormatNumber(String str){
    String regEx="[^0-9]";
    Pattern p = Pattern.compile(regEx);
    Matcher m = p.matcher(str);
    return m.replaceAll("").trim();
}

  public static String getNumber(String str){
    // 控制正则表达式的匹配行为的参数(小数)
    Pattern p = Pattern.compile("(\\d+\\.\\d+)");
    //Matcher类的构造方法也是私有的,不能随意创建,只能通过Pattern.matcher(CharSequence input)方法得到该类的实例.
    Matcher m = p.matcher(str);
    //m.find用来判断该字符串中是否含有与"(\\d+\\.\\d+)"相匹配的子串
    if (m.find()) {
        //如果有相匹配的,则判断是否为null操作
        //group()中的参数：0表示匹配整个正则，1表示匹配第一个括号的正则,2表示匹配第二个正则,在这只有一个括号,即1和0是一样的
        str = m.group(1) == null ? "" : m.group(1);
    } else {
        //如果匹配不到小数，就进行整数匹配
        p = Pattern.compile("(\\d+)");
        m = p.matcher(str);
        if (m.find()) {
            //如果有整数相匹配
            str = m.group(1) == null ? "" : m.group(1);
        } else {
            //如果没有小数和整数相匹配,即字符串中没有整数和小数，就设为空
            str = "";
        }
    }
    return str;
}

/**
 * 版本号比较
 *
 * @param v1
 * @param v2
 * @return 0代表相等，1代表左边大，-1代表右边大
 * Utils.compareVersion("1.0.358_20180820090554","1.0.358_20180820090553")=1
 */
public static int compareVersion(String v1, String v2) {
    if (v1.equals(v2)) {
        return 0;
    }
    String[] version1Array = v1.split("[._]");
    String[] version2Array = v2.split("[._]");
    int index = 0;
    int minLen = Math.min(version1Array.length, version2Array.length);
    long diff = 0;

    while (index < minLen
            && (diff = Long.parseLong(version1Array[index])
            - Long.parseLong(version2Array[index])) == 0) {
        index++;
    }
    if (diff == 0) {
        for (int i = index; i < version1Array.length; i++) {
            if (Long.parseLong(version1Array[i]) > 0) {
                return 1;
            }
        }

        for (int i = index; i < version2Array.length; i++) {
            if (Long.parseLong(version2Array[i]) > 0) {
                return -1;
            }
        }
        return 0;
    } else {
        return diff > 0 ? 1 : -1;
    }
}