在项目开发中经常遇到导出excel或导入excel的业务需求,通过采用poi可以实现,本文尝试一直新的方式,通过easyexcel实现对excel的导入导出。
maven依赖
<!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>1.1.2-beat1</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
Excel工具类
@Slf4j
public class ExcelUtil {
private static Sheet initSheet;
static {
initSheet = new Sheet(1, 0);
initSheet.setSheetName("sheet");
//设置自适应宽度
initSheet.setAutoWidth(Boolean.TRUE);
}
/**
* 读取少于1000行数据
* @param filePath 文件绝对路径
* @return
*/
public static List<Object> readLessThan1000Row(String filePath){
return readLessThan1000RowBySheet(filePath,null);
}
/**
* 读小于1000行数据, 带样式
* filePath 文件绝对路径
* initSheet :
* sheetNo: sheet页码,默认为1
* headLineMun: 从第几行开始读取数据,默认为0, 表示从第一行开始读取
* clazz: 返回数据List<Object> 中Object的类名
*/
public static List<Object> readLessThan1000RowBySheet(String filePath, Sheet sheet){
if(!StringUtils.hasText(filePath)){
return null;
}
sheet = sheet != null ? sheet : initSheet;
InputStream fileStream = null;
try {
fileStream = new FileInputStream(filePath);
return EasyExcelFactory.read(fileStream, sheet);
} catch (FileNotFoundException e) {
log.info("找不到文件或文件路径错误, 文件:{}", filePath);
}finally {
try {
if(fileStream != null){
fileStream.close();
}
} catch (IOException e) {
log.info("excel文件读取失败, 失败原因:{}", e);
}
}
return null;
}
/**
* 读大于1000行数据
* @param filePath 文件觉得路径
* @return
*/
public static List<Object> readMoreThan1000Row(String filePath){
return readMoreThan1000RowBySheet(filePath,null);
}
/**
* 读大于1000行数据, 带样式
* @param filePath 文件觉得路径
* @return
*/
public static List<Object> readMoreThan1000RowBySheet(String filePath, Sheet sheet){
if(!StringUtils.hasText(filePath)){
return null;
}
sheet = sheet != null ? sheet : initSheet;
InputStream fileStream = null;
try {
fileStream = new FileInputStream(filePath);
ExcelListener excelListener = new ExcelListener();
EasyExcelFactory.readBySax(fileStream, sheet, excelListener);
return excelListener.getDatas();
} catch (FileNotFoundException e) {
log.error("找不到文件或文件路径错误, 文件:{}", filePath);
}finally {
try {
if(fileStream != null){
fileStream.close();
}
} catch (IOException e) {
log.error("excel文件读取失败, 失败原因:{}", e);
}
}
return null;
}
/**
* 生成excle
* @param filePath 绝对路径
* @param data 数据源
* @param head 表头
*/
public static void writeBySimple(String filePath, List<List<Object>> data, List<String> head){
writeSimpleBySheet(filePath,data,head,null);
}
/**
* 生成excle
* @param filePath 绝对路径
* @param data 数据源
* @param sheet excle页面样式
* @param head 表头
*/
public static void writeSimpleBySheet(String filePath, List<List<Object>> data, List<String> head, Sheet sheet){
sheet = (sheet != null) ? sheet : initSheet;
if(head != null){
List<List<String>> list = new ArrayList<>();
head.forEach(h -> list.add(Collections.singletonList(h)));
sheet.setHead(list);
}
OutputStream outputStream = null;
ExcelWriter writer = null;
try {
outputStream = new FileOutputStream(filePath);
writer = EasyExcelFactory.getWriter(outputStream);
writer.write1(data,sheet);
} catch (FileNotFoundException e) {
log.error("找不到文件或文件路径错误, 文件:{}", filePath);
}finally {
try {
if(writer != null){
writer.finish();
}
if(outputStream != null){
outputStream.close();
}
} catch (IOException e) {
log.error("excel文件导出失败, 失败原因:{}", e);
}
}
}
/**
* 生成excle
* @param filePath 绝对路径
* @param data 数据源
*/
public static void writeWithTemplate(String filePath, List<? extends BaseRowModel> data){
writeWithTemplateAndSheet(filePath,data,null);
}
/**
* 生成excle
* @param filePath 绝对路径
* @param data 数据源
* @param sheet excle页面样式
*/
public static void writeWithTemplateAndSheet(String filePath, List<? extends BaseRowModel> data, Sheet sheet){
if(CollectionUtils.isEmpty(data)){
return;
}
sheet = (sheet != null) ? sheet : initSheet;
sheet.setClazz(data.get(0).getClass());
OutputStream outputStream = null;
ExcelWriter writer = null;
try {
outputStream = new FileOutputStream(filePath);
writer = EasyExcelFactory.getWriter(outputStream);
writer.write(data,sheet);
} catch (FileNotFoundException e) {
log.error("找不到文件或文件路径错误, 文件:{}", filePath);
}finally {
try {
if(writer != null){
writer.finish();
}
if(outputStream != null){
outputStream.close();
}
} catch (IOException e) {
log.error("excel文件导出失败, 失败原因:{}", e);
}
}
}
/**
* 生成多Sheet的excle
* @param filePath 绝对路径
* @param multipleSheelPropetys
*/
public static void writeWithMultipleSheel(String filePath,List<MultipleSheelPropety> multipleSheelPropetys){
if(CollectionUtils.isEmpty(multipleSheelPropetys)){
return;
}
OutputStream outputStream = null;
ExcelWriter writer = null;
try {
outputStream = new FileOutputStream(filePath);
writer = EasyExcelFactory.getWriter(outputStream);
for (MultipleSheelPropety multipleSheelPropety : multipleSheelPropetys) {
Sheet sheet = multipleSheelPropety.getSheet() != null ? multipleSheelPropety.getSheet() : initSheet;
if(!CollectionUtils.isEmpty(multipleSheelPropety.getData())){
sheet.setClazz(multipleSheelPropety.getData().get(0).getClass());
}
writer.write(multipleSheelPropety.getData(), sheet);
}
} catch (FileNotFoundException e) {
log.error("找不到文件或文件路径错误, 文件:{}", filePath);
}finally {
try {
if(writer != null){
writer.finish();
}
if(outputStream != null){
outputStream.close();
}
} catch (IOException e) {
log.error("excel文件导出失败, 失败原因:{}", e);
}
}
}
/*********************匿名内部类开始,可以提取出去******************************/
@Data
public static class MultipleSheelPropety{
private List<? extends BaseRowModel> data;
private Sheet sheet;
}
/**
* 解析监听器,
* 每解析一行会回调invoke()方法。
* 整个excel解析结束会执行doAfterAllAnalysed()方法
*
* @author: chenmingjian
* @date: 19-4-3 14:11
*/
@Getter
@Setter
public static class ExcelListener extends AnalysisEventListener {
private List<Object> datas = new ArrayList<>();
/**
* 逐行解析
* object : 当前行的数据
*/
@Override
public void invoke(Object object, AnalysisContext context) {
//当前行
// context.getCurrentRowNum()
if (object != null) {
datas.add(object);
}
}
/**
* 解析完所有数据后会调用该方法
*/
@Override
public void doAfterAllAnalysed(AnalysisContext context) {
//解析结束销毁不用的资源
}
}
/************************匿名内部类结束,可以提取出去***************************/
}
测试
/**
* 读取少于1000行的excle
*/
@Test
public void readLessThan1000Row(){
String filePath = "D:\\Mobile\\MSBD\\document\\问题记录.xlsx";
List<Object> objects = ExcelUtil.readLessThan1000Row(filePath);
objects.forEach(System.out::println);
}
/**
* 生成excle
* 带sheet参数的方法可参照测试方法readLessThan1000RowBySheet()
*/
@Test
public void writeBySimple(){
String filePath = "D:\\自定义.xlsx";
List<List<Object>> data = new ArrayList<>();
data.add(Arrays.asList("111","222","333"));
data.add(Arrays.asList("111","222","333"));
data.add(Arrays.asList("111","222","333"));
List<String> head = Arrays.asList("表头1", "表头2", "表头3");
ExcelUtil.writeBySimple(filePath,data,head);
}