io.github.linpeilie.utils.StrUtil Maven / Gradle / Ivy
package io.github.linpeilie.utils;
public class StrUtil {
/**
* 去掉首部指定长度的字符串并将剩余字符串首字母小写
例如：str=setName, preLength=3 =》 return name
*
* @param str 被处理的字符串
* @param preLength 去掉的长度
* @return 处理后的字符串，不符合规范返回null
*/
public static String removePreAndLowerFirst(CharSequence str, int preLength) {
if (str == null) {
return null;
}
if (str.length() > preLength) {
char first = Character.toLowerCase(str.charAt(preLength));
if (str.length() > preLength + 1) {
return first + str.toString().substring(preLength + 1);
}
return String.valueOf(first);
} else {
return str.toString();
}
}
/**
* 获得set或get或is方法对应的标准属性名
例如：setName 返回 name
*
*
* getName =》name
* setName =》name
* isName =》name
*
*
* @param getOrSetMethodName Get或Set方法名
* @return 如果是set或get方法名，返回field， 否则null
*/
public static String getGeneralField(CharSequence getOrSetMethodName) {
final String getOrSetMethodNameStr = getOrSetMethodName.toString();
if (getOrSetMethodNameStr.startsWith("get") || getOrSetMethodNameStr.startsWith("set")) {
return removePreAndLowerFirst(getOrSetMethodName, 3);
} else if (getOrSetMethodNameStr.startsWith("is")) {
return removePreAndLowerFirst(getOrSetMethodName, 2);
}
return null;
}
public static boolean isEmpty(CharSequence cs) {
return cs == null || cs.length() == 0;
}
public static boolean isNotEmpty(CharSequence cs) {
return !isEmpty(cs);
}
public static boolean equalsIgnoreCase(CharSequence str1, CharSequence str2) {
if (null == str1) {
// 只有两个都为null才判断相等
return str2 == null;
}
if (null == str2) {
// 字符串2空，字符串1非空，直接false
return false;
}
return str1.toString().equalsIgnoreCase(str2.toString());
}
public static boolean isBlank(CharSequence str) {
final int length;
if ((str == null) || ((length = str.length()) == 0)) {
return true;
}
for (int i = 0; i < length; i++) {
// 只要有一个非空字符即为非空字符串
if (false == CharUtils.isBlankChar(str.charAt(i))) {
return false;
}
}
return true;
}
}