通用String工具类

柔情只为你懂 2022-02-24 06:48 192阅读 0赞

> 总结了项目中用到的stringUtils, 一些常见的功能都有, 当然,驼峰转换,大家也可用用guava的包,  
> 欢迎小伙伴们在留言栏,留言新功能

package com.zheng.common.util;
    
    
    import org.apache.commons.lang.StringUtils;
    
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    
    public class StringUtil { 
    
        private static Pattern linePattern = Pattern.compile("_(\\w)");
        private static Pattern humpPattern = Pattern.compile("[A-Z]");
    
        /** * 下划线转驼峰 * @param str * @return */
        public static String lineToHump(String str) { 
            if (null == str || "".equals(str)) { 
                return str;
            }
            str = str.toLowerCase();
            Matcher matcher = linePattern.matcher(str);
            StringBuffer sb = new StringBuffer();
            while (matcher.find()) { 
                matcher.appendReplacement(sb, matcher.group(1).toUpperCase());
            }
            matcher.appendTail(sb);
    
            str = sb.toString();
            str = str.substring(0, 1).toUpperCase() + str.substring(1);
    
            return str;
        }
    
        /** * 驼峰转下划线,效率比上面高 * @param str * @return */
        public static String humpToLine(String str) { 
            Matcher matcher = humpPattern.matcher(str);
            StringBuffer sb = new StringBuffer();
            while (matcher.find()) { 
                matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());
            }
            matcher.appendTail(sb);
            return sb.toString();
        }
    
        /** * 驼峰转下划线(简单写法，效率低于{@link #humpToLine(String)}) * @param str * @return */
        public static String humpToLine2(String str) { 
            return str.replaceAll("[A-Z]", "_$0").toLowerCase();
        }
    
        /** * 首字母转小写 * @param s * @return */
        public static String toLowerCaseFirstOne(String s) { 
            if (StringUtils.isBlank(s)) { 
                return s;
            }
            if (Character.isLowerCase(s.charAt(0))) { 
                return s;
            } else { 
                return (new StringBuilder()).append(Character.toLowerCase(s.charAt(0))).append(s.substring(1)).toString();
            }
        }
    
        /** * 首字母转大写 * @param s * @return */
        public static String toUpperCaseFirstOne(String s) { 
            if (StringUtils.isBlank(s)) { 
                return s;
            }
            if (Character.isUpperCase(s.charAt(0))) { 
                return s;
            } else { 
                return (new StringBuffer()).append(Character.toUpperCase(s.charAt(0))).append(s.substring(1)).toString();
            }
        }
    
        /** * object转String * @param object * @return */
        public static String getString(Object object) { 
            return getString(object, "");
        }
    
        public static String getString(Object object, String defaultValue) { 
            if (null == object) { 
                return defaultValue;
            }
            try { 
                return object.toString();
            } catch (Exception e) { 
                return defaultValue;
            }
        }
    
        /** * object转Integer * @param object * @return */
        public static int getInt(Object object) { 
            return getInt(object, -1);
        }
    
        public static int getInt(Object object, Integer defaultValue) { 
            if (null == object) { 
                return defaultValue;
            }
            try { 
                return Integer.parseInt(object.toString());
            } catch (Exception e) { 
                return defaultValue;
            }
        }
    
        /** * object转Boolean * @param object * @return */
        public static boolean getBoolean(Object object) { 
            return getBoolean(object, false);
        }
    
        public static boolean getBoolean(Object object, Boolean defaultValue) { 
            if (null == object) { 
                return defaultValue;
            }
            try { 
                return Boolean.parseBoolean(object.toString());
            } catch (Exception e) { 
                return defaultValue;
            }
        }
    
    }