feat:issue-3298 add LocalTime converter

easyexcel-core/src/main/java/com/alibaba/excel/converters/DefaultConverterLoader.java

@@ -37,6 +37,7 @@ import com.alibaba.excel.converters.localdate.LocalDateStringConverter;
 import com.alibaba.excel.converters.localdatetime.LocalDateTimeNumberConverter;
 import com.alibaba.excel.converters.localdatetime.LocalDateTimeDateConverter;
 import com.alibaba.excel.converters.localdatetime.LocalDateTimeStringConverter;
+import com.alibaba.excel.converters.localtime.LocalTimeStringConverter;
 import com.alibaba.excel.converters.longconverter.LongBooleanConverter;
 import com.alibaba.excel.converters.longconverter.LongNumberConverter;
 import com.alibaba.excel.converters.longconverter.LongStringConverter;
@@ -91,6 +92,8 @@ public class DefaultConverterLoader {
         putAllConverter(new LocalDateTimeNumberConverter());
         putAllConverter(new LocalDateTimeStringConverter());
 
+        putAllConverter(new LocalTimeStringConverter());
+
         putAllConverter(new DoubleBooleanConverter());
         putAllConverter(new DoubleNumberConverter());
         putAllConverter(new DoubleStringConverter());
@@ -125,6 +128,7 @@ public class DefaultConverterLoader {
         putWriteConverter(new ByteNumberConverter());
         putWriteConverter(new DateDateConverter());
         putWriteConverter(new LocalDateTimeDateConverter());
+        putWriteConverter(new LocalTimeStringConverter());
         putWriteConverter(new LocalDateDateConverter());
         putWriteConverter(new DoubleNumberConverter());
         putWriteConverter(new FloatNumberConverter());
@@ -146,6 +150,7 @@ public class DefaultConverterLoader {
         putWriteStringConverter(new DateStringConverter());
         putWriteStringConverter(new LocalDateStringConverter());
         putWriteStringConverter(new LocalDateTimeStringConverter());
+        putWriteStringConverter(new LocalTimeStringConverter());
         putWriteStringConverter(new DoubleStringConverter());
         putWriteStringConverter(new FloatStringConverter());
         putWriteStringConverter(new IntegerStringConverter());

easyexcel-core/src/main/java/com/alibaba/excel/converters/localtime/LocalTimeStringConverter.java

@@ -0,0 +1,52 @@
+package com.alibaba.excel.converters.localtime;
+
+import com.alibaba.excel.converters.Converter;
+import com.alibaba.excel.enums.CellDataTypeEnum;
+import com.alibaba.excel.metadata.GlobalConfiguration;
+import com.alibaba.excel.metadata.data.ReadCellData;
+import com.alibaba.excel.metadata.data.WriteCellData;
+import com.alibaba.excel.metadata.property.ExcelContentProperty;
+import com.alibaba.excel.util.DateUtils;
+
+import java.text.ParseException;
+import java.time.LocalTime;
+
+/**
+ * LocalTime and string converter
+ *
+ * @author yuhaowin
+ */
+public class LocalTimeStringConverter implements Converter<LocalTime> {
+    @Override
+    public Class<?> supportJavaTypeKey() {
+        return LocalTime.class;
+    }
+
+    @Override
+    public CellDataTypeEnum supportExcelTypeKey() {
+        return CellDataTypeEnum.STRING;
+    }
+
+    @Override
+    public LocalTime convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty,
+                                       GlobalConfiguration globalConfiguration) throws ParseException {
+        if (contentProperty == null || contentProperty.getDateTimeFormatProperty() == null) {
+            return DateUtils.parseLocalTime(cellData.getStringValue(), null, globalConfiguration.getLocale());
+        } else {
+            return DateUtils.parseLocalTime(cellData.getStringValue(),
+                    contentProperty.getDateTimeFormatProperty().getFormat(), globalConfiguration.getLocale());
+        }
+    }
+
+    @Override
+    public WriteCellData<?> convertToExcelData(LocalTime value, ExcelContentProperty contentProperty,
+                                               GlobalConfiguration globalConfiguration) {
+        if (contentProperty == null || contentProperty.getDateTimeFormatProperty() == null) {
+            return new WriteCellData<>(DateUtils.format(value, null, globalConfiguration.getLocale()));
+        } else {
+            return new WriteCellData<>(
+                    DateUtils.format(value, contentProperty.getDateTimeFormatProperty().getFormat(),
+                            globalConfiguration.getLocale()));
+        }
+    }
+}

easyexcel-core/src/main/java/com/alibaba/excel/util/DateUtils.java

@@ -58,6 +58,7 @@ public class DateUtils {
     public static final String DATE_FORMAT_19 = "yyyy-MM-dd HH:mm:ss";
     public static final String DATE_FORMAT_19_FORWARD_SLASH = "yyyy/MM/dd HH:mm:ss";
     private static final String MINUS = "-";
+    private static final String DEFAULT_LOCAL_TIME_FORMAT = "HH:mm:ss";
 
     public static String defaultDateFormat = DATE_FORMAT_19;
 
@@ -118,6 +119,25 @@ public class DateUtils {
         }
     }
 
+    /**
+     * convert string to date
+     *
+     * @param dateString
+     * @param dateFormat
+     * @param local
+     * @return
+     */
+    public static LocalTime parseLocalTime(String dateString, String dateFormat, Locale local) {
+        if (StringUtils.isEmpty(dateFormat)) {
+            dateFormat = DEFAULT_LOCAL_TIME_FORMAT;
+        }
+        if (local == null) {
+            return LocalTime.parse(dateString, DateTimeFormatter.ofPattern(dateFormat));
+        } else {
+            return LocalTime.parse(dateString, DateTimeFormatter.ofPattern(dateFormat, local));
+        }
+    }
+
     /**
      * convert string to date
      *
@@ -254,6 +274,38 @@ public class DateUtils {
         return format(date, dateFormat, null);
     }
 
+    /**
+     * Format date
+     *
+     * @param date
+     * @param dateFormat
+     * @return
+     */
+    public static String format(LocalTime date, String dateFormat) {
+        return format(date, dateFormat, null);
+    }
+
+    /**
+     * Format date
+     *
+     * @param date
+     * @param dateFormat
+     * @return
+     */
+    public static String format(LocalTime date, String dateFormat, Locale local) {
+        if (date == null) {
+            return null;
+        }
+        if (StringUtils.isEmpty(dateFormat)) {
+            dateFormat = DEFAULT_LOCAL_TIME_FORMAT;
+        }
+        if (local == null) {
+            return date.format(DateTimeFormatter.ofPattern(dateFormat));
+        } else {
+            return date.format(DateTimeFormatter.ofPattern(dateFormat, local));
+        }
+    }
+
     /**
      * Format date
      *