一、添加依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.6</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.6</version>
</dependency>
二、自定义注解
@Target({ElementType.FIELD, ElementType.TYPE})
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface ExcelTag {
String tag();
IndexedColors fontColor() default IndexedColors.BLACK;
}
三、工具类
public class ExcelUtils {
public static <T> List<T> parse(InputStream excel, Class<T> clazz) throws Exception {
XSSFWorkbook xssfWorkbook = new XSSFWorkbook(excel);
XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
XSSFRow titleCell = xssfSheet.getRow(0);
List<T> dataList = new ArrayList<>(xssfSheet.getLastRowNum());
T datum;
Map<String, Field> fieldMap = getFieldMap(clazz);
for (int i = 1; i <= xssfSheet.getLastRowNum(); i++) {
XSSFRow xssfRow = xssfSheet.getRow(i);
datum = clazz.newInstance();
int minCell = xssfRow.getFirstCellNum();
int maxCell = xssfRow.getLastCellNum();
for (int cellNum = minCell; cellNum <= maxCell; cellNum++) {
XSSFCell title = titleCell.getCell(cellNum);
if (title == null) {
continue;
}
String tag = title.getStringCellValue();
Field field = fieldMap.get(tag);
if (field == null) {
continue;
}
Class<?> type = field.getType();
Object value = null;
XSSFCell cell = xssfRow.getCell(cellNum);
if (cell == null) {
continue;
}
if (type.equals(String.class)) {
cell.setCellType(Cell.CELL_TYPE_STRING);
value = cell.getStringCellValue();
} else if (type.equals(Date.class)) {
value = cell.getDateCellValue();
}
PropertyUtils.setProperty(datum, field.getName(), value);
}
dataList.add(datum);
}
return dataList;
}
private static <T> Map<String, Field> getFieldMap(Class<T> clazz) {
Field[] fields = FieldUtils.getFieldsWithAnnotation(clazz, ExcelTag.class);
Map<String, Field> fieldMap = new HashMap<>(fields.length / 3 * 4);
for (Field field : fields) {
ExcelTag annotation = field.getAnnotation(ExcelTag.class);
fieldMap.put(annotation.tag(), field);
}
return fieldMap;
}
public static <T> void export(OutputStream outputStream, List<T> dataList, Class<T> clazz) throws Exception {
XSSFWorkbook wb = new XSSFWorkbook();
ExcelTag annotation = clazz.getAnnotation(ExcelTag.class);
String tag = annotation.tag();
XSSFSheet sheet = wb.createSheet(tag);
Field[] fields = FieldUtils.getFieldsWithAnnotation(clazz, ExcelTag.class);
XSSFRow headers = sheet.createRow(0);
for (int index = 0; index < fields.length; index++) {
Field field = fields[index];
int type = 0;
if (String.class.equals(field.getType())) {
type = Cell.CELL_TYPE_STRING;
}
ExcelTag excelTag = field.getAnnotation(ExcelTag.class);
XSSFCell cell = headers.createCell(index, type);
XSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
XSSFFont font1 = wb.createFont();
font1.setColor(excelTag.fontColor().getIndex());
style.setFont(font1);
cell.setCellStyle(style);
tag = excelTag.tag();
cell.setCellValue(tag);
sheet.setColumnWidth(index, tag.getBytes().length*256);
}
XSSFRow row;
Field field;
for (int i = 0; i < dataList.size(); i++) {
T datum = dataList.get(i);
row = sheet.createRow(i + 1);
for (int index = 0; index < fields.length; index++) {
field = fields[index];
int type = 0;
XSSFCell cell = row.createCell(index, type);
XSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cell.setCellStyle(style);
Object property = PropertyUtils.getProperty(datum, field.getName());
if (String.class.equals(field.getType())) {
cell.setCellValue((String) property);
}
else if (Integer.class.equals(field.getType())) {
cell.setCellValue((Integer) property);
}
else if (double.class.equals(field.getType())) {
cell.setCellValue((double) property);
}
else if (Date.class.equals(field.getType())) {
cell.setCellValue((Date) property);
}
else {
cell.setCellValue((String) property);
}
}
}
wb.write(outputStream);
}
}
四、数据传输对象
package org.lhj.pro.poiImport;
import org.apache.poi.ss.usermodel.IndexedColors;
import lombok.Data;
@Data
@ExcelTag(tag = "路由信息")
public class RoutingExcelDto {
@ExcelTag(tag = "机构编号", fontColor = IndexedColors.RED)
private Integer orgCode;
@ExcelTag(tag = "机构名称", fontColor = IndexedColors.RED)
private String orgName;
@ExcelTag(tag = "服务编号", fontColor = IndexedColors.RED)
private Integer serviceCode;
@ExcelTag(tag = "应用类型")
private String applicationType;
@ExcelTag(tag = "业务领域")
private String businessArea;
@ExcelTag(tag = "服务名称")
private String serviceName;
@ExcelTag(tag = "大版本号", fontColor = IndexedColors.RED)
private double bigVersion;
@ExcelTag(tag = "小版本号", fontColor = IndexedColors.RED)
private double version;
@ExcelTag(tag = "服务描述")
private String description;
@ExcelTag(tag = "系统名称", fontColor = IndexedColors.RED)
private String systemName;
@ExcelTag(tag = "服务地址", fontColor = IndexedColors.RED)
private String servicePath;
@ExcelTag(tag = "第三方服务名称", fontColor = IndexedColors.RED)
private String thirdServiceName;
public RoutingExcelDto(Integer orgCode, String orgName, Integer serviceCode, String applicationType,
String businessArea, String serviceName, double bigVersion, double version, String description,
String systemName, String servicePath, String thirdServiceName) {
super();
this.orgCode = orgCode;
this.orgName = orgName;
this.serviceCode = serviceCode;
this.applicationType = applicationType;
this.businessArea = businessArea;
this.serviceName = serviceName;
this.bigVersion = bigVersion;
this.version = version;
this.description = description;
this.systemName = systemName;
this.servicePath = servicePath;
this.thirdServiceName = thirdServiceName;
}
public RoutingExcelDto() {
super();
}
}
五、创建 Controller测试
package org.lhj.pro.poiImport;
import java.io.FileNotFoundException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
@RestController
@RequestMapping("/import")
public class ImportController {
@RequestMapping("/exportExcel")
public String exportExcel(HttpServletResponse response) throws FileNotFoundException, Exception {
List<RoutingExcelDto> dataList = new ArrayList<>();
for (int i = 1; i < 10; i++) {
RoutingExcelDto routingExcelDto = new RoutingExcelDto(i,"123",new Random().nextInt(1000)+1000, "y", "123", "123", 1.1, 1.11, "123", "123", "123", "123");
dataList.add(routingExcelDto);
}
ServletOutputStream out = response.getOutputStream();
String title = new String((new SimpleDateFormat("yyyy-MM-dd HH-mm-ss").format(new Date())).getBytes(),
"UTF-8");
response.setHeader("Content-disposition", "filename=" + title +RoutingExcelDto.class.getSimpleName()+ ".xls");
ExcelUtils.export(out, dataList, RoutingExcelDto.class);
return "导出列表成功！";
}
@RequestMapping("/parseExcel")
public List<RoutingExcelDto> parseExcel(MultipartFile excel) {
List<RoutingExcelDto> parseList;
try {
parseList = ExcelUtils.parse(excel.getInputStream(), RoutingExcelDto.class);
return parseList;
} catch (Exception e) {
throw new RuntimeException(e.getMessage());
}
}
}
