StringUtils (mybatis-plus 2.1.0 API)

java.lang.Object
- com.baomidou.mybatisplus.toolkit.StringUtils

```
public class StringUtils
extends Object
```
String 工具类

作者:

D.Yang

字段概要

字段
限定符和类型字段和说明

static String EMPTY
空字符

static String IS
空字符

static String PLACE_HOLDER
占位符

static char UNDERLINE
下划线字符

字段
限定符和类型	字段和说明
`static String`	`EMPTY` 空字符
`static String`	`IS` 空字符
`static String`	`PLACE_HOLDER` 占位符
`static char`	`UNDERLINE` 下划线字符

方法概要

方法
限定符和类型	方法和说明
`static String`	`camelToHyphen(String input)` 驼峰转连字符 StringUtils.camelToHyphen( "managerAdminUserService" ) = manager-admin-user-service
`static String`	`camelToUnderline(String param)` 字符串驼峰转下划线格式
`static String`	`capitalize(String str)` 字符串第一个字母大写
`static boolean`	`checkValNotNull(Object object)` 判断对象是否为空
`static boolean`	`checkValNull(Object object)` 判断对象是否为空
`static String`	`concatCapitalize(String concatStr, String str)` 拼接字符串第二个字符串第一个字母大写
`static boolean`	`containsLowerCase(String s)`
`static boolean`	`containsUpperCase(String word)` 包含大写字母
`static boolean`	`endsWith(String str, String suffix)` Check if a String ends with a specified suffix.
`static boolean`	`endsWithIgnoreCase(String str, String suffix)` Case insensitive check if a String ends with a specified suffix.
`static String`	`firstCharToLower(String rawString)` 第一个首字母小写,之后字符大小写的不变 StringUtils.firstCharToLower( "UserService" ) = userService StringUtils.firstCharToLower( "UserServiceImpl" ) = userServiceImpl
`static String`	`firstToLowerCase(String param)` 首字母转换小写
`static Boolean`	`isBoolean(Class<?> propertyCls)` 是否为Boolean类型(包含普通类型)
`static boolean`	`isCapitalMode(String word)` 是否为大写命名
`static Boolean`	`isCharSequence(Class<?> cls)` 是否为CharSequence类型
`static Boolean`	`isCharSequence(String propertyType)` 是否为CharSequence类型
`static boolean`	`isEmpty(CharSequence cs)` 判断字符串是否为空
`static boolean`	`isNotEmpty(CharSequence cs)` 判断字符串是否不为空
`static boolean`	`isUpperCase(String str)` 判断字符串是否为纯大写字母
`static boolean`	`match(String regex, String str)` 正则表达式匹配
`static String`	`prefixToLower(String rawString, int index)` 前n个首字母小写,之后字符大小写的不变
`static String`	`quotaMark(Object obj)` 使用单引号包含字符串
`static String`	`quotaMarkList(Collection<?> coll)` 使用单引号包含字符串
`static String`	`removeIsPrefixIfBoolean(String propertyName, Class<?> propertyType)` 去除boolean类型is开头的字符串
`static String`	`removePrefixAfterPrefixToLower(String rawString, int index)` 删除字符前缀之后,首字母小写,之后字符大小写的不变 StringUtils.removePrefixAfterPrefixToLower( "isUser", 2 ) = user StringUtils.removePrefixAfterPrefixToLower( "isUserInfo", 2 ) = userInfo
`static String[]`	`split(String str, String separatorChars)` Splits the provided text into an array, separators specified.
`static List<String>`	`splitWorker(String str, String separatorChars, int max, boolean preserveAllTokens)` Performs the logic for the `split` and `splitPreserveAllTokens` methods that return a maximum array length.
`static String`	`sqlArgsFill(String content, Object... args)` SQL 参数填充
`static String`	`sqlParam(Object obj)` 获取SQL PARAMS字符串
`static String`	`underlineToCamel(String param)` 字符串下划线转驼峰格式

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - EMPTY
```
public static final String EMPTY
```
    空字符
    
    另请参阅:
    常量字段值
  - IS
```
public static final String IS
```
    空字符
    
    另请参阅:
    常量字段值
  - UNDERLINE
```
public static final char UNDERLINE
```
    下划线字符
    
    另请参阅:
    常量字段值
  - PLACE_HOLDER
```
public static final String PLACE_HOLDER
```
    占位符
    
    另请参阅:
    常量字段值
- 方法详细资料
  - isEmpty
```
public static boolean isEmpty(CharSequence cs)
```
    判断字符串是否为空
    
    参数:
    cs - 需要判断字符串
    
    返回:
    判断结果
  - isNotEmpty
```
public static boolean isNotEmpty(CharSequence cs)
```
    判断字符串是否不为空
    
    参数:
    cs - 需要判断字符串
    
    返回:
    判断结果
  - camelToUnderline
```
public static String camelToUnderline(String param)
```
    字符串驼峰转下划线格式
    
    参数:
    param - 需要转换的字符串
    
    返回:
    转换好的字符串
  - underlineToCamel
```
public static String underlineToCamel(String param)
```
    字符串下划线转驼峰格式
    
    参数:
    param - 需要转换的字符串
    
    返回:
    转换好的字符串
  - firstToLowerCase
```
public static String firstToLowerCase(String param)
```
    首字母转换小写
    
    参数:
    param - 需要转换的字符串
    
    返回:
    转换好的字符串
  - isUpperCase
```
public static boolean isUpperCase(String str)
```
    判断字符串是否为纯大写字母
    
    参数:
    str - 要匹配的字符串
    
    返回:
  - match
```
public static boolean match(String regex,
            String str)
```
    正则表达式匹配
    
    参数:
    regex - 正则表达式字符串
    str - 要匹配的字符串
    
    返回:
    如果str 符合 regex的正则表达式格式,返回true, 否则返回 false;
  - sqlArgsFill
```
public static String sqlArgsFill(String content,
                 Object... args)
```
    SQL 参数填充
    
    参数:
    content - 填充内容
    args - 填充参数
    
    返回:
  - sqlParam
```
public static String sqlParam(Object obj)
```
    获取SQL PARAMS字符串
    
    参数:
    obj -
    
    返回:
  - quotaMark
```
public static String quotaMark(Object obj)
```
    使用单引号包含字符串
    
    参数:
    obj - 原字符串
    
    返回:
    单引号包含的原字符串
  - quotaMarkList
```
public static String quotaMarkList(Collection<?> coll)
```
    使用单引号包含字符串
    
    参数:
    coll - 集合
    
    返回:
    单引号包含的原字符串的集合形式
  - concatCapitalize
```
public static String concatCapitalize(String concatStr,
                      String str)
```
    拼接字符串第二个字符串第一个字母大写
    
    参数:
    concatStr -
    str -
    
    返回:
  - capitalize
```
public static String capitalize(String str)
```
    字符串第一个字母大写
    
    参数:
    str -
    
    返回:
  - checkValNotNull
```
public static boolean checkValNotNull(Object object)
```
    判断对象是否为空
    
    参数:
    object -
    
    返回:
  - checkValNull
```
public static boolean checkValNull(Object object)
```
    判断对象是否为空
    
    参数:
    object -
    
    返回:
  - containsUpperCase
```
public static boolean containsUpperCase(String word)
```
    包含大写字母
    
    参数:
    word - 待判断字符串
    
    返回:
  - isCapitalMode
```
public static boolean isCapitalMode(String word)
```
    是否为大写命名
    
    参数:
    word - 待判断字符串
    
    返回:
  - endsWith
```
public static boolean endsWith(String str,
               String suffix)
```
    Check if a String ends with a specified suffix.
    
    nulls are handled without exceptions. Two null references are considered to be equal. The comparison is case sensitive.
```
 StringUtils.endsWith(null, null)      = true
 StringUtils.endsWith(null, "abcdef")  = false
 StringUtils.endsWith("def", null)     = false
 StringUtils.endsWith("def", "abcdef") = true
 StringUtils.endsWith("def", "ABCDEF") = false
 
```
    参数:
    str - the String to check, may be null
    suffix - the suffix to find, may be null
    
    返回:
    true if the String ends with the suffix, case sensitive, or both null
    从以下版本开始:
    
    2.4
    
    另请参阅:
    String.endsWith(String)
  - endsWithIgnoreCase
```
public static boolean endsWithIgnoreCase(String str,
                         String suffix)
```
    Case insensitive check if a String ends with a specified suffix.
    
    nulls are handled without exceptions. Two null references are considered to be equal. The comparison is case insensitive.
```
 StringUtils.endsWithIgnoreCase(null, null)      = true
 StringUtils.endsWithIgnoreCase(null, "abcdef")  = false
 StringUtils.endsWithIgnoreCase("def", null)     = false
 StringUtils.endsWithIgnoreCase("def", "abcdef") = true
 StringUtils.endsWithIgnoreCase("def", "ABCDEF") = false
 
```
    参数:
    str - the String to check, may be null
    suffix - the suffix to find, may be null
    
    返回:
    true if the String ends with the suffix, case insensitive, or both null
    从以下版本开始:
    
    2.4
    
    另请参阅:
    String.endsWith(String)
  - split
```
public static String[] split(String str,
             String separatorChars)
```
    Splits the provided text into an array, separators specified. This is an alternative to using StringTokenizer.
    
    The separator is not included in the returned String array. Adjacent separators are treated as one separator. For more control over the split use the StrTokenizer class.
    
    A null input String returns null. A null separatorChars splits on whitespace.
```
 StringUtils.split(null, *)         = null
 StringUtils.split("", *)           = []
 StringUtils.split("abc def", null) = ["abc", "def"]
 StringUtils.split("abc def", " ")  = ["abc", "def"]
 StringUtils.split("abc  def", " ") = ["abc", "def"]
 StringUtils.split("ab:cd:ef", ":") = ["ab", "cd", "ef"]
 
```
    参数:
    str - the String to parse, may be null
    separatorChars - the characters used as the delimiters, null splits on whitespace
    
    返回:
    an array of parsed Strings, null if null String input
  - splitWorker
```
public static List<String> splitWorker(String str,
                       String separatorChars,
                       int max,
                       boolean preserveAllTokens)
```
    Performs the logic for the split and splitPreserveAllTokens methods that return a maximum array length.
    
    参数:
    str - the String to parse, may be null
    separatorChars - the separate character
    max - the maximum number of elements to include in the array. A zero or negative value implies no limit.
    preserveAllTokens - if true, adjacent separators are treated as empty token separators; if false, adjacent separators are treated as one separator.
    
    返回:
    an array of parsed Strings, null if null String input
  - isCharSequence
```
public static Boolean isCharSequence(Class<?> cls)
```
    是否为CharSequence类型
    
    参数:
    cls -
    
    返回:
  - removeIsPrefixIfBoolean
```
public static String removeIsPrefixIfBoolean(String propertyName,
                             Class<?> propertyType)
```
    去除boolean类型is开头的字符串
    
    参数:
    propertyName - 字段名
    propertyType - 字段类型
    
    返回:
  - isCharSequence
```
public static Boolean isCharSequence(String propertyType)
```
    是否为CharSequence类型
    
    参数:
    propertyType -
    
    返回:
  - isBoolean
```
public static Boolean isBoolean(Class<?> propertyCls)
```
    是否为Boolean类型(包含普通类型)
    
    参数:
    propertyCls -
    
    返回:
  - firstCharToLower
```
public static String firstCharToLower(String rawString)
```
    第一个首字母小写,之后字符大小写的不变
    StringUtils.firstCharToLower( "UserService" ) = userService StringUtils.firstCharToLower( "UserServiceImpl" ) = userServiceImpl
    
    参数:
    rawString - 需要处理的字符串
    
    返回:
  - prefixToLower
```
public static String prefixToLower(String rawString,
                   int index)
```
    前n个首字母小写,之后字符大小写的不变
    
    参数:
    rawString - 需要处理的字符串
    index - 多少个字符(从左至右)
    
    返回:
  - removePrefixAfterPrefixToLower
```
public static String removePrefixAfterPrefixToLower(String rawString,
                                    int index)
```
    删除字符前缀之后,首字母小写,之后字符大小写的不变
    StringUtils.removePrefixAfterPrefixToLower( "isUser", 2 ) = user StringUtils.removePrefixAfterPrefixToLower( "isUserInfo", 2 ) = userInfo
    
    参数:
    rawString - 需要处理的字符串
    index - 删除多少个字符(从左至右)
    
    返回:
  - camelToHyphen
```
public static String camelToHyphen(String input)
```
    驼峰转连字符
    StringUtils.camelToHyphen( "managerAdminUserService" ) = manager-admin-user-service
    
    参数:
    input -
    
    返回:
    以'-'分隔
    另请参阅:
    document
  - containsLowerCase
```
public static boolean containsLowerCase(String s)
```

类 StringUtils

字段概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

EMPTY

IS

UNDERLINE

PLACE_HOLDER

方法详细资料

isEmpty

isNotEmpty

camelToUnderline

underlineToCamel

firstToLowerCase

isUpperCase

match

sqlArgsFill

sqlParam

quotaMark

quotaMarkList

concatCapitalize

capitalize

checkValNotNull

checkValNull

containsUpperCase

isCapitalMode

endsWith

endsWithIgnoreCase

split

splitWorker

isCharSequence

removeIsPrefixIfBoolean

isCharSequence

isBoolean

firstCharToLower

prefixToLower

removePrefixAfterPrefixToLower

camelToHyphen

containsLowerCase