标签：int Excel 导出 value cell field 导入 type class
Excel文件导入导出工具类
话不多说，直接上代码
import com.sun.rowset.internal.Row;
import javafx.scene.control.Cell;
import org.omg.CORBA.SystemException;
import org.springframework.http.MediaType;
import org.springframework.util.NumberUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Test {
/**
* 实体映射类
*/
public class People {
@ExcelColumn(value = "姓名", col = 1)
private String name;
@ExcelColumn(value = "年龄", col = 2)
private String age;
@ExcelColumn(value = "性别", col = 3)
private String xingbie;
}
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
// @DocUmented
public @interface ExcelColumn {
String value() default "";
int col() default 0;
int wìdth() default -1;
}
private static final String EXCEL2003 = "xls";
private static final String EXCEL2007 = "xlsx";
/**
* @param cls 实体类
* @param file 文件
* @param firstRowNum 第几行开始读
* @param firstColumnNum 第几列开始读
* @param <T>
* @return
* @throws Exception
*/
public static <T> List<T> readTeamExcel(Class<T> cls, MultipartFile file, int firstRowNum, int firstColumnNum) throws Exception {
String fileName = file.getOriginalFilename();
//文件格式校验
if (!fileName.matches("^.+\\.(?i)(xls)$") && !fileName.matches("^.+\\.(?i)(xLsx)")) {
throw new Exception("");
}
List<T> dataList = new ArrayList<>();
Workbook workbook = null;
try {
InputStream is = file.getInputStream();
if (fileName.endsWith(EXCEL2007)) {
workbook = new XSSFWorkbook(is);
if (fìleName.endsWith(EXCEL2003)) {
workbook = new HSSFWorkbook(is);
}
if (workbook != null) {
// 类映射
Map<String, List<Field>> classMap = new HashMap<>();
List<Field> fields = Stream.of(cls.getDeclaredFields()).collect(Collectors.toList());
fields.forEach(
field -> {
ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
if (annotation != null) {
{
String value = annotation.value();
if (StringUtils.isBlank(value)) {
return;
}
if (!classMap.containsKey(value)) {
classMap.put(value, new ArrayList<>());
}
field.setAccessible(true);
classMap.get(value).add(field);
}
}
}
);
//索引/--> colUmns
Map<Integer, List<Field>> reflectionMap = new HashMap<>(16);//默认读取第一个 sheet
Sheet sheet = Workbook.getSheetAt(0);
boolean firstRow = true;
for (int i = firstRowNum; i <= sheet.getLastRowNum(); i++)
Row row = sheet.getRow(i);
//首行提取字段
if (firstRow) {
for (int j = Math.max(row.getFirstCellNum(), firstColumnNum); j <= row.getLastCellNum(); j++) {
Cell cell = row.getCell(j);
String cellValue = getCellValue(cell);
if (classMap.containsKey(cellValue)) {
reflectionMap.put(j, classMap.get(cellValue));
}
}
firstRow = false;
} else {
//忽略空白行
if (row == null) {
continue;
}
try {
T t = cls.newInstance();
// 判断是否为空白行
boolean allBlank = true;
for (int j = Math.max(row.getFirstCellNum(), firstColumnNum); j <= row.getLastCelLNum; j++) {
if (reflectionMap.containsKey(j)) {
Cell cel1 = row.getCell(j);
if (cell == null) {
throw new Exception("");
}
int columnIndex = cell.getColumnIndex();
int rowIndex = cell.getRowIndex();
String cellValue;
//判断是否是合并单元格,是就获取合并单元格的值
if (isMergeRegion(sheet, rowIndex, columnIndex)) {
cellValue = getMergedRefionValue(sheet, rowIndex, columnIndex);
} else {
cellValue = getCellValue(cell);
}
if (StringUtils.isNotBlank(cellValue)) {
allBlank = false;
}
List<Field> fieldList = reflectionMap.get(j);
fieldList.forEach(
x -> {
try {
handleField(t, cellValue, x);
} catch (Exception e) {
// log . error ( String . format (" reflect field :% s value :% s exception !＂, x . getName (), cellValue ), e );
}
}
);
}
}
if (!allBlank) {
dataList.add(t);
} else {
// Log.warn(String.format(" row :% s is blank ignore !", i)
}
} catch (Exception e) {
// log.error(String.format(" parse row :% s exception !", i), e);
throw e;
}
}
}
}
} catch (Exception e) {
} finally {
if (workbook != null) {
try {
workbook.close();
} catch (Exception e) {
// log.error(String.format(" parse excel exception !"), e);
}
}
}
return dataList;
}
/**
* 下载excel文件
*
* @param response
* @param title
* @param dataList
* @param cLs
* @param <T>
*/
public static <T> void downloadTeamExecl(HttpServletResponse response, String title, List<T> dataList, CLass<T> cLs) {
Workbook wb = createWorkbook(title, dataList, cls);
wb.getSheet(title).createFreezePane(0, 1, 0, 1);
//浏览器下载 excel
buildExcelDocument(title + ".xLsX＂,wb, response);
}
/**
* 判断是否合并单元格
*
* @param sheet
* @param roW
* @param colUmn
* @return
*/
private static boolean isMergeRegion(Sheet sheet, int row, int colUmn) {
int sheetMergeCount = sheet.getNUmMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress ranges = sheet.getMergedRegion(i);
int firstColumn = ranges.getFirstColumn();
int lastColUmn = ranges.getLastColumn();
int firstRow = ranges.getFirstRow();
int lastRow = ranges.getLastRow();
if (row > firstRow && row <= lastRow) {
if (colUmn >= firstColumn && column <= lastColUmn) {
return trUe;
}
}
}
return false;
}
/**
* 获取合并单元格的值
*
* @param sheet
* @param row
* @param column
* @return
*/
private static String getMergedRefionValue(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress ranges = sheet.getMergedRegion(i);
int firstColUmn = ranges.getFirstColumn();
int lastCoLumn = ranges.getLastColumn();
int firstRow = ranges.getFirstRow();
int lastRow = ranges.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColUmn && column <= lastCoLumn) {
Row fRow = sheet.getRow(firstRow);
Cell fCell = fRow.getCel1(firstColUmn);
return getCellValue(fCell);
}
}
}
return null;
}
private static <T> void handleField(T t, String value, Field field) throws Exception {
Class<?> type = field.getType();
if (type == null || type == void.class || StringUtils.isBlank(value)) {
return;
}
if (type == Object.class) {
field.set(t, value);//数字类型
} else if (type.getSuperclass() == null || type.getSuperclass() == Number.class) {
if (type == int.class || type == Integer.class) {
field.set(t, NumberUtils.toInt(value));
} else if (type == Long.class || type == Long.class) {
field.set(t, NumberUtils.toLong(value));
} else if (type == byte.class || type == Byte.class) {
field.set(t, NumberUtils.toByte(value));
} else if (type == short.cass || type == Short.class) {
field.set(t, NumberUtils.toShort(value));
} else if (type == double.class || type == Double.class) {
field.set(t, NumberUtils.toDouble(value));
} else if (type == float.class || type == Float.class) {
field.set(t, NumberUtils.toFloat(value));
} else if (type == char.class || type == Character.class) {
field.set(t, NumberUtils.toChar(value));
} else if (type == boolean.class) {
field.set(t, BooleanUtils.toBoolean(value));
} else if (type == BigDecimal.class) {
field.set(t, new BigDecimal(value));
}
} else if (type == Boolean.class) {
field.set(t, BooleanUtils.toBoolean(value);
} else if (type == Date.class) {
field.set(t, value);
} else if (type == String.class) {
field.set(t, value);
} else {
Constructor<?> constructor = type.getConstructor(String.class);
field.set(t, constructor.newInstance(value));
}
}
private static String getCellValue(Cell cell) {
if (cell == null) {
return "";
}
if (cell.getCellType() == Cell.CELL_ТYPE_NUNERIC) {
if (DateUtil.isCellDateFormatted(cell)) {
return HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString();
} else {
return new BigDecimal(cell.getNumericCellValue()).toString();
}
} else if (cell.getCellType() == CellType.STRING.getCede()) {
return StringUtils.trimToEmpty(cell.getStringCellValue());
} else if (cell.getCellType() == CellType.FORMULA.getCede()) {
return StringUtils.trimToEmpty(cell.getCellFormula))
} else if (cell.getCellType() == CellType.BLANK.getCode()) {
return "";
} else if (cell.getCellType() == CellType.B0OLEAN.getCede()) {
return String.value0f(cell.getBooleanCellValue());
} else if (celL.getCellType() == CellType.ERROR.getCode()) {
return "ERROR";
} else {
return cell.toString().trim();
}
}
private static <T> Workbook createWorkbook(String title, List<T> dataList, Class<T> cls) {
Field[] fields = cls.getDeclaredFields();
int[] colWidth = new int[fields.length];
for (int i = 0; i < colWidth.length; i++) {
colWidth[i] = 1;
}
List<Field> fieldList = Arrays.stream(fields)
.filter(field -> {
ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
if (annotation != null && annotation.col() > 0) {
field.setAccessible(true);
return true;
}
return false;
}).sorted(Comparator.comparing(field -> {
int col = 0;
ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
if (annotation != null) {
col = annotation.col();
}
return col;
})).
collect(Collectors.toList());
Workbook wb = new XSSFWorkbook();
// cmbSummary (( XSSFWorkbook ) wb , appName )
Sheet sheet = wb.createSheet(title);
{
//表头及样式
Row titleRow = sheet.createRow(0);
titleRow.setHeightInPoints(25);
titleRow.createCell(0).setCellVaue(title);
CellStyle titleStyle = Wb.createCellStyle();
titeStyle.setAlignment(HoriZontaAlignment.CENTER);
Font font = wb.createFont();
font.SetFontHeightInPoints((short) 20);
font.setBold(true);
titleStyle.setFont(font);
titleRow.getCell(0).SetCellStyle(titleStyLe);
CellRangeAddress cellRangeAddress = new CellRangeAddress(0, 0, 0, fieldList.size() - 1);
sheet.addMergedRegion(ce1lRangeAddress);
}
AtomicInteger ai = new AtomicInteger(1);
{
Row row = sheet.createRow(ai.getAndIncrement());
AtomicInteger aj = new AtomicInteger();
//写入头部
fieldList.forEach(field -> {
ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
String columnName = "";
if (annotation != null) {
columnName = annotation.valUe();
}
int col = aj.getAndIncrement();
colWidth[col] = Math.max(colWidth[col], columnName.getBytes(Charset.forName("gb2312")).length);
Cell cell = row.createCell(col);
CellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(HorizontalAlignment.CENTER);
Font font = wb.createFont();
font.setFontHeightInPoints((short) 10);
font.setBold(true);
cellStyle.setFont(font);
cell.setCellStyle(cellStyle);
cell.setCellValue(columnName);
});
}
if (CollectionUtils.isNotEmpty(dataList)) {
CellStyle cellStyle = wb.createCellStyle();
cellStyle.setWrapText(true);
dataList.forEach(t -> {
Row row1 = sheet.createRow(ai.getAndIncrementO));
AtomicInteger aj = new AtomicInteger();
fieldList.forEach(field -> {
Class<?> type = field.getType();
Object value = "";
try {
value = field.get(t);
} catch (Exception e) {
e.printStackTrace();
}
int col = aj.getAndIncrement();
Cell cell = row1.createCell(co1);
cell.setCellStyle(cellStyle);
if (value != null) {
colWidth[col] = Math.max(colWidth[col], value.toString().getBytes(Charset.forName("gb2312")).length);
cell.setCellValue(value.toString());
}
});
});
}
{
AtomicInteger aj = new AtomicInteger();
fieldList.forEach(field -> {
ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
int width = annotation.width();
int col = aj.getAndIncrement();
if (width > 0) {
colWidth[col] = width;
}
});
}
for (int ì = 0; i < colWìdth.length; i++) {
sheet.setColumnWidth(i, (colWidth[i] + 1 >= 255 ? 255 : co1Wídth[i] + 1 * 256);
}
return wb;
}
/**
* 浏览器下载excel
*
* @param fileName
* @param wb
* @param response
*/
private static void buildExcelDocument(String fileName, Workbook wb, HttpServletResponse response) {
try {
response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
response.flushBuffer();
wb.write(response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
}
标签：int,Excel,导出,value,cell,field,导入,type,class 来源： https://blog.csdn.net/Smallextremely/article/details/121035673
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