目录
工具类
java
/**
* 导出Excel工具类
*/
public class EasyExcelUtil<T> {
/**
* 单sheet（Map写入）
* @param response 响应对象
* @param headList 头部集合
* @param dataList 数据集合
*/
public static void write(HttpServletResponse response, List<ExcelHead> headList, List<Map<String, Object>> dataList) throws IOException {
ExcelWriterBuilder writerBuilder = EasyExcel.write();
writerBuilder.file(response.getOutputStream());
writerBuilder.excelType(ExcelTypeEnum.XLSX);
//日期转换器
TimestampStringConverter converter = new TimestampStringConverter();
writerBuilder.registerConverter(converter).registerWriteHandler(new ColumnWidthStyleStrategy())
.head(convertHead(headList)).sheet("sheet1")
.doWrite(convertData(headList, dataList));
}
/**
* 多sheet（Map写入）
* @param response 响应对象
* @param headMap 头部Map数据
* @param dataMap 数据Map数据
* @param sheetMap sheet Map数据
*/
public static void multipleWrite(HttpServletResponse response
, Map<String,List<ExcelHead>> headMap
, Map<String,List<Map<String, Object>>> dataMap
, Map<String,String> sheetMap) throws IOException {
//日期转换器
TimestampStringConverter converter = new TimestampStringConverter();
ExcelWriter excelWriter = EasyExcel.write()
.registerConverter(converter)
.registerWriteHandler(new ColumnWidthStyleStrategy())
.file(response.getOutputStream())
.excelType(ExcelTypeEnum.XLSX).autoCloseStream(true).build();
int i = 0;
for (Map.Entry<String,List<ExcelHead>> entry : headMap.entrySet()) {
WriteSheet writeSheet = EasyExcel
.writerSheet(i++, sheetMap.get(entry.getKey()))
.head(convertHead(entry.getValue())).build();
excelWriter.write(convertData(entry.getValue(), dataMap.get(entry.getKey())), writeSheet);
}
excelWriter.finish();
}
/**
* 实体写入
* @param response 响应对象
* @param sheetName sheet名称
* @param c 实体类
* @param list 实体数据
*/
public static <T> void writeSheet(HttpServletResponse response, String sheetName, Class<T> c, List<T> list) throws IOException {
EasyExcel.write(response.getOutputStream(), c).sheet(sheetName).doWrite(list);
}
/**
* 读取并存储到实体
* @param fileName 路径地址
* @param sheetName sheet名称
* @param c 实体类
*/
public static <T> List<T> read(String fileName, String sheetName, Class c) {
List<T> list = new ArrayList();
EasyExcel.read(fileName, c, new ReadListener<T>() {
@Override
public void invoke(T o, AnalysisContext analysisContext) {
list.add(o);
}
@Override
public void doAfterAllAnalysed(AnalysisContext analysisContext) {
}
}).sheet(sheetName).doRead();
return list;
}
/**
* 读取并存储到实体
* @param fileName 路径地址
* @param sheetNo 指定sheet
*/
public static Map<String,Object> readToMap(String fileName, Integer sheetNo) {
Map<String,Object> result = new HashMap<>();
List<Map<String,Object>> dataList = new ArrayList();
//头部map
Map<String,String> headMap = new HashMap<>();
//头部拼音map
Map<String,String> pinyinMap = new HashMap<>();
EasyExcel.read(fileName,new AnalysisEventListener<Map<Integer, Object>>() {
@Override
public void invoke(Map<Integer, Object> data, AnalysisContext context) {
Map<String,Object> map = new HashMap<>();
for (Integer key : data.keySet()) {
if(key!=null && data.get(key)!=null) {
map.put("field_" + key.toString(), data.get(key));
}
}
dataList.add(map);
}
@Override
public void doAfterAllAnalysed(AnalysisContext analysisContext) {
}
@Override
public void invokeHead(Map<Integer, ReadCellData<?>> head, AnalysisContext context) {
for (Integer key : head.keySet()) {
if(key!=null && head.get(key)!=null && StringUtils.isNotBlank(head.get(key).getStringValue())) {
headMap.put("field_" + key.toString(), head.get(key).getStringValue());
pinyinMap.put("field_" + key.toString(), Pinyin4jUtils.getPinYinHeadChar(head.get(key).getStringValue()));
}
}
}
}).sheet(sheetNo).headRowNumber(1).doRead();
result.put("headMap",headMap);
result.put("pinyinMap",pinyinMap);
result.put("dataList",dataList);
result.put("count",dataList.size());
return result;
}
/**
* 读取表头并存储到实体
* @param fileName 路径地址
* @param sheetNo 指定sheet
*/
public static Map<String,Object> readToMapHead(String fileName, Integer sheetNo) {
Map<String,Object> result = new HashMap<>();
//头部map
Map<String,String> headMap = new HashMap<>();
//头部拼音map
Map<String,String> pinyinMap = new HashMap<>();
EasyExcel.read(fileName,new AnalysisEventListener<Map<Integer, Object>>() {
@Override
public void invoke(Map<Integer, Object> data, AnalysisContext context) {
}
@Override
public void doAfterAllAnalysed(AnalysisContext analysisContext) {
}
@Override
public void invokeHead(Map<Integer, ReadCellData<?>> head, AnalysisContext context) {
for (Integer key : head.keySet()) {
if(key!=null && head.get(key)!=null && StringUtils.isNotBlank(head.get(key).getStringValue())) {
headMap.put("field_" + key.toString(), head.get(key).getStringValue());
pinyinMap.put("field_" + key.toString(), Pinyin4jUtils.getPinYinHeadChar(head.get(key).getStringValue()));
}
}
}
}).sheet(sheetNo).headRowNumber(1).doRead();
result.put("headMap",headMap);
result.put("pinyinMap",pinyinMap);
return result;
}
/**
* 头部转换
* @param headList 头部集合
*/
private static List<List<String>> convertHead(List<ExcelHead> headList) {
List<List<String>> list = new ArrayList<>();
for (ExcelHead head : headList) {
list.add(Lists.newArrayList(head.getTitle()));
}
//沒有搞清楚head的参数为List<List<String>>,用List<String>就OK了
return list;
}
/**
* 数据转换
* @param headList 头部集合
* @param dataList 数据集合
*/
private static List<List<Object>> convertData(List<ExcelHead> headList, List<Map<String, Object>> dataList) {
List<List<Object>> result = new ArrayList();
//对dataList转为easyExcel的数据格式
for (Map<String, Object> data : dataList) {
List<Object> row = new ArrayList();
for (ExcelHead h : headList) {
Object o = data.get(h.getFieldName());
//需要对null的处理，比如age的null，要转为-1
row.add(handler(o, h.getNullValue()));
}
result.add(row);
}
return result;
}
/**
* 空值处理
* @param o 数值
* @param nullValue 空值置换
*/
private static Object handler(Object o, Object nullValue) {
return o != null ? o : nullValue;
}
}头部实体类（要和工具类在同一个module或项目下）
java
/**
* Excel头部实体
*/
public class ExcelHead<T> {
private String fieldName;
private String title;
private T nullValue;
public ExcelHead(String fieldName, String title) {
this.fieldName = fieldName;
this.title = title;
}
public ExcelHead(String fieldName, String title, T nullValue) {
this.fieldName = fieldName;
this.title = title;
this.nullValue = nullValue;
}
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public T getNullValue() {
return nullValue;
}
public void setNullValue(T nullValue) {
this.nullValue = nullValue;
}
}注意：真正导出表格的是ExcelWriterSheetBuilder类中的方法，前面只是封装，这个是真正导出用到的；这个类是EasyExcel自带的。
日期转换器
java
/**
* 日期转换器
*/
public class TimestampStringConverter implements Converter<Timestamp> {
@Override
public Class<?> supportJavaTypeKey() {
return Timestamp.class;
}
@Override
public CellDataTypeEnum supportExcelTypeKey() {
return CellDataTypeEnum.STRING;
}
@Override
public WriteCellData<?> convertToExcelData(Timestamp value, ExcelContentProperty contentProperty,
GlobalConfiguration globalConfiguration) {
WriteCellData cellData = new WriteCellData();
String cellValue;
if (contentProperty == null || contentProperty.getDateTimeFormatProperty() == null) {
cellValue = DateUtils.format(value.toLocalDateTime(), null, globalConfiguration.getLocale());
} else {
cellValue = DateUtils.format(value.toLocalDateTime(), contentProperty.getDateTimeFormatProperty().getFormat(),
globalConfiguration.getLocale());
}
cellData.setType(CellDataTypeEnum.STRING);
cellData.setStringValue(cellValue);
cellData.setData(cellValue);
return cellData;
}
}