cn.wandersnail.common.VersionUtils Maven / Gradle / Ivy
package cn.wandersnail.common;
import java.util.ArrayList;
import java.util.List;
/**
* 版本号工具
*
* date: 2019/8/6 18:21
* author: zengfansheng
*/
public class VersionUtils {
//将字母和数字拆分出来
private static List splitCell(String s) {
List list = new ArrayList<>();
StringBuilder sb = new StringBuilder();
char[] chars = s.toCharArray();
Boolean isNum = null;
for (char c : chars) {
boolean same = true;
boolean num = c >= '0' && c <= '9';
if (isNum == null) {
isNum = num;
} else {
same = isNum && num;
isNum = num;
}
if (!same) {
list.add(sb.toString());
sb.setLength(0);
}
sb.append(c);
}
//添加最后一个
list.add(sb.toString());
return list;
}
private static Integer toInt(String s) {
try {
return Integer.parseInt(s);
} catch (Exception e) {
return null;
}
}
/**
* 比较版本号大小
*
* @param shortBig 当较长的版本号包含短的时，true则短的为大，false则短的为小
* @return 相等，则返回值0；小于，则返回负数；大于，则返回正数。
*/
public static int compare(String ver1, String ver2, boolean shortBig) {
//将将版本号字符串以.分割进行比较
String s1 = ver1.replaceAll(" ", "");
String s2 = ver2.replaceAll(" ", "");
if (s1.equals(s2)) {
return 0;
} else if (s1.contains(s2)) {
return shortBig ? -1 : 1;
} else if (s2.contains(s1)) {
return shortBig ? 1 : -1;
}
String[] vCells1 = s1.split("\\.");
String[] vCells2 = s2.split("\\.");
//以长度短的，对分割元素逐个比较
int len = Math.min(vCells1.length, vCells2.length);
for (int i = 0; i < len; i++) {
List cellList1 = splitCell(vCells1[i]);
List cellList2 = splitCell(vCells2[i]);
//同样逐个比较
int len1 = Math.min(cellList1.size(), cellList2.size());
for (int j = 0; j < len1; j++) {
String cell1 = cellList1.get(j);
String cell2 = cellList2.get(j);
Integer cell1Int = toInt(cell1);
Integer cell2Int = toInt(cell2);
int result;
if (cell1Int != null && cell2Int != null) {
result = cell1Int.compareTo(cell2Int);
} else {
result = cell1.compareTo(cell2);
}
if (result != 0) {
return result;
}
}
}
return 0;
}
}