mirror of https://github.com/alibaba/easyexcel
Jiaju Zhuang
5 years ago
10 changed files with 361 additions and 60 deletions
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package com.alibaba.excel.util; |
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import java.util.HashMap; |
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import java.util.Map; |
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import com.alibaba.excel.converters.Converter; |
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import com.alibaba.excel.converters.ConverterKeyBuild; |
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import com.alibaba.excel.enums.CellDataTypeEnum; |
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import com.alibaba.excel.exception.ExcelDataConvertException; |
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import com.alibaba.excel.metadata.CellData; |
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import com.alibaba.excel.metadata.GlobalConfiguration; |
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import com.alibaba.excel.metadata.property.ExcelContentProperty; |
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import com.alibaba.excel.read.metadata.holder.ReadHolder; |
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/** |
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* Converting objects |
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* |
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* @author Jiaju Zhuang |
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**/ |
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public class ConverterUtils { |
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private ConverterUtils() {} |
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/** |
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* Convert it into a String map |
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* |
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* @param cellDataMap |
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* @param readHolder |
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* @return |
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*/ |
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public static Map<Integer, String> convertToStringMap(Map<Integer, CellData> cellDataMap, ReadHolder readHolder) { |
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Map<Integer, String> stringMap = new HashMap<Integer, String>(cellDataMap.size() * 4 / 3 + 1); |
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for (Map.Entry<Integer, CellData> entry : cellDataMap.entrySet()) { |
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CellData cellData = entry.getValue(); |
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if (cellData.getType() == CellDataTypeEnum.EMPTY) { |
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stringMap.put(entry.getKey(), null); |
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continue; |
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} |
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Converter converter = |
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readHolder.converterMap().get(ConverterKeyBuild.buildKey(String.class, cellData.getType())); |
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if (converter == null) { |
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throw new ExcelDataConvertException( |
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"Converter not found, convert " + cellData.getType() + " to String"); |
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} |
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try { |
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stringMap.put(entry.getKey(), |
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(String)(converter.convertToJavaData(cellData, null, readHolder.globalConfiguration()))); |
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} catch (Exception e) { |
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throw new ExcelDataConvertException("Convert data " + cellData + " to String error ", e); |
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} |
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} |
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return stringMap; |
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} |
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/** |
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* Convert it into a Java object |
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* |
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* @param cellData |
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* @param clazz |
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* @param contentProperty |
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* @param converterMap |
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* @param globalConfiguration |
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* @return |
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*/ |
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public static Object convertToJavaObject(CellData cellData, Class clazz, ExcelContentProperty contentProperty, |
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Map<String, Converter> converterMap, GlobalConfiguration globalConfiguration) { |
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if (clazz == CellData.class) { |
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return new CellData(cellData); |
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} |
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Converter converter = null; |
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if (contentProperty != null) { |
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converter = contentProperty.getConverter(); |
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} |
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if (converter == null) { |
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converter = converterMap.get(ConverterKeyBuild.buildKey(clazz, cellData.getType())); |
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} |
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if (converter == null) { |
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throw new ExcelDataConvertException( |
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"Converter not found, convert " + cellData.getType() + " to " + clazz.getName()); |
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} |
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try { |
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return converter.convertToJavaData(cellData, contentProperty, globalConfiguration); |
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} catch (Exception e) { |
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throw new ExcelDataConvertException("Convert data " + cellData + " to " + clazz + " error ", e); |
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} |
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} |
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} |
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@ -0,0 +1,73 @@
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package com.alibaba.easyexcel.test.demo.read; |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.Map; |
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import org.junit.Assert; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import com.alibaba.excel.context.AnalysisContext; |
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import com.alibaba.excel.event.AnalysisEventListener; |
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import com.alibaba.fastjson.JSON; |
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/** |
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* 读取头 |
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* |
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* @author Jiaju Zhuang |
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*/ |
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public class DemoHeadDataListener extends AnalysisEventListener<DemoData> { |
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private static final Logger LOGGER = LoggerFactory.getLogger(DemoHeadDataListener.class); |
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/** |
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* 每隔5条存储数据库，实际使用中可以3000条，然后清理list ，方便内存回收 |
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*/ |
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private static final int BATCH_COUNT = 5; |
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List<DemoData> list = new ArrayList<DemoData>(); |
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/** |
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* 在转换异常 获取其他异常下会调用本接口。抛出异常则停止读取。如果这里不抛出异常则 继续读取下一行。 |
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* |
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* @param exception |
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* @param context |
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* @throws Exception |
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*/ |
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@Override |
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public void onException(Exception exception, AnalysisContext context) { |
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LOGGER.error("解析失败，但是继续解析下一行", exception); |
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} |
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/** |
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* 这里会一行行的返回头 |
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* |
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* @param headMap |
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* @param context |
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*/ |
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@Override |
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public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) { |
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LOGGER.info("解析到一条头数据:{}", JSON.toJSONString(headMap)); |
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} |
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@Override |
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public void invoke(DemoData data, AnalysisContext context) { |
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LOGGER.info("解析到一条数据:{}", JSON.toJSONString(data)); |
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if (list.size() >= BATCH_COUNT) { |
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saveData(); |
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list.clear(); |
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} |
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} |
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@Override |
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public void doAfterAllAnalysed(AnalysisContext context) { |
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saveData(); |
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LOGGER.info("所有数据解析完成！"); |
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} |
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/** |
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* 加上存储数据库 |
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*/ |
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private void saveData() { |
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LOGGER.info("{}条数据，开始存储数据库！", list.size()); |
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LOGGER.info("存储数据库成功！"); |
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} |
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} |
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