com.alipay.api.internal.util.StringUtils Maven / Gradle / Ivy
package com.alipay.api.internal.util;
/**
* 字符串工具类。
*
* @author carver.gu
* @since 1.0, Sep 12, 2009
*/
public abstract class StringUtils {
private StringUtils() {}
/**
* 检查指定的字符串是否为空。
*
* - SysUtils.isEmpty(null) = true
* - SysUtils.isEmpty("") = true
* - SysUtils.isEmpty(" ") = true
* - SysUtils.isEmpty("abc") = false
*
*
* @param value 待检查的字符串
* @return true/false
*/
public static boolean isEmpty(String value) {
int strLen;
if (value == null || (strLen = value.length()) == 0) {
return true;
}
for (int i = 0; i < strLen; i++) {
if ((Character.isWhitespace(value.charAt(i)) == false)) {
return false;
}
}
return true;
}
/**
* 检查对象是否为数字型字符串,包含负数开头的。
*/
public static boolean isNumeric(Object obj) {
if (obj == null) {
return false;
}
char[] chars = obj.toString().toCharArray();
int length = chars.length;
if(length < 1)
return false;
int i = 0;
if(length > 1 && chars[0] == '-')
i = 1;
for (; i < length; i++) {
if (!Character.isDigit(chars[i])) {
return false;
}
}
return true;
}
/**
* 检查指定的字符串列表是否不为空。
*/
public static boolean areNotEmpty(String... values) {
boolean result = true;
if (values == null || values.length == 0) {
result = false;
} else {
for (String value : values) {
result &= !isEmpty(value);
}
}
return result;
}
/**
* 把通用字符编码的字符串转化为汉字编码。
*/
public static String unicodeToChinese(String unicode) {
StringBuilder out = new StringBuilder();
if (!isEmpty(unicode)) {
for (int i = 0; i < unicode.length(); i++) {
out.append(unicode.charAt(i));
}
}
return out.toString();
}
/**
* 过滤不可见字符
*/
public static String stripNonValidXMLCharacters(String input) {
if (input == null || ("".equals(input)))
return "";
StringBuilder out = new StringBuilder();
char current;
for (int i = 0; i < input.length(); i++) {
current = input.charAt(i);
if ((current == 0x9) || (current == 0xA) || (current == 0xD)
|| ((current >= 0x20) && (current <= 0xD7FF))
|| ((current >= 0xE000) && (current <= 0xFFFD))
|| ((current >= 0x10000) && (current <= 0x10FFFF)))
out.append(current);
}
return out.toString();
}
}