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java 通用工具类
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| import com.google.common.base.CaseFormat; | |
| import java.nio.charset.Charset; | |
| import java.nio.charset.StandardCharsets; | |
| import java.util.regex.Pattern; | |
| public final class CommonUtils { | |
| public static final int PROCESSORS = Runtime.getRuntime().availableProcessors(); | |
| public static final String EMPTY = ""; | |
| public static final String SPLIT = "!~!"; | |
| public static final Charset UTF8 = StandardCharsets.UTF_8; | |
| private static final Pattern BLANK_REGEX = Pattern.compile("\\s{2,}"); | |
| public static String replaceBlank(String str) { | |
| return BLANK_REGEX.matcher(str).replaceAll(" "); | |
| } | |
| public static String columnToField(String column) { | |
| return CaseFormat.UPPER_UNDERSCORE.converterTo(CaseFormat.LOWER_CAMEL) | |
| .convert(column.toUpperCase().startsWith("C_") ? column.toUpperCase().substring(2) : column); | |
| } | |
| // Invalid index name [abcXyz], must be lowercase ==> convert to : abc-xyz | |
| public static String tableToType(String table) { | |
| return CaseFormat.UPPER_UNDERSCORE.converterTo(CaseFormat.LOWER_HYPHEN) | |
| .convert(table.toUpperCase().startsWith("T_") ? table.toUpperCase().substring(2) : table); | |
| } | |
| public static String addSuffix(String src) { | |
| if (isBlank(src)) { | |
| return "/"; | |
| } | |
| if (src.endsWith("/")) { | |
| return src; | |
| } | |
| return src + "/"; | |
| } | |
| public static boolean isNumber(Object obj) { | |
| if (isBlank(obj)) { | |
| return false; | |
| } | |
| try { | |
| Double.parseDouble(obj.toString()); | |
| return true; | |
| } catch (NumberFormatException e) { | |
| return false; | |
| } | |
| } | |
| public static int toInt(Object obj) { | |
| if (isBlank(obj)) { | |
| return 0; | |
| } | |
| try { | |
| return Integer.parseInt(obj.toString()); | |
| } catch (NumberFormatException e) { | |
| return 0; | |
| } | |
| } | |
| public static long toLong(Object obj) { | |
| if (isBlank(obj)) { | |
| return 0L; | |
| } | |
| try { | |
| return Long.parseLong(obj.toString()); | |
| } catch (NumberFormatException e) { | |
| return 0L; | |
| } | |
| } | |
| public static boolean greater0(Number obj) { | |
| return obj != null && obj.doubleValue() > 0; | |
| } | |
| public static boolean less0(Number obj) { | |
| return obj == null || obj.doubleValue() <= 0; | |
| } | |
| public static boolean isBlank(Object obj) { | |
| return obj == null || obj.toString().trim().length() == 0 || "null".equalsIgnoreCase(obj.toString().trim()); | |
| } | |
| public static boolean isNotBlank(Object obj) { | |
| return !isBlank(obj); | |
| } | |
| public static void assertNil(Object obj, String msg) { | |
| assertException(isBlank(obj), msg); | |
| } | |
| public static void assert0(Number obj, String msg) { | |
| assertException(less0(obj), msg); | |
| } | |
| public static void assertException(Boolean flag, String msg) { | |
| if (flag != null && flag) { | |
| assertException(msg); | |
| } | |
| } | |
| public static void assertException(String msg) { | |
| throw new RuntimeException(msg); | |
| } | |
| } |
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