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张乐
354
crmeb/src/main/java/com/utils/ExcelUtil.java
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354
crmeb/src/main/java/com/utils/ExcelUtil.java
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package com.utils;
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import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
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import com.constants.Constants;
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import com.zbkj.crmeb.export.vo.ExcelColumn;
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import org.apache.commons.lang3.BooleanUtils;
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import org.apache.commons.lang3.CharUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.lang3.math.NumberUtils;
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import org.apache.poi.hssf.usermodel.HSSFWorkbook;
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import org.apache.poi.ss.usermodel.*;
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import org.apache.poi.xssf.usermodel.XSSFWorkbook;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.http.MediaType;
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import org.springframework.web.multipart.MultipartFile;
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import javax.servlet.http.HttpServletResponse;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.math.BigDecimal;
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import java.net.URLEncoder;
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import java.util.*;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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/** excel操作类
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* @author Mr.zhang
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* @since 2020-04-17
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**/
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public class ExcelUtil {
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private final static Logger log = LoggerFactory.getLogger(ExcelUtil.class);
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private final static String EXCEL2003 = "xls";
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private final static String EXCEL2007 = "xlsx";
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private static String sheetName;
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public static String getSheetName() {
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return sheetName;
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}
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public static void setSheetName(String sheetName) {
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ExcelUtil.sheetName = sheetName;
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}
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public static String getFileName() {
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return fileName;
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}
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public static void setFileName(String fileName) {
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ExcelUtil.fileName = fileName;
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}
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private static String fileName;
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public static <T> List<T> readExcel(String path, Class<T> cls, MultipartFile file){
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String fileName = file.getOriginalFilename();
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if (!fileName.matches("^.+\\.(?i)(xls)$") && !fileName.matches("^.+\\.(?i)(xlsx)$")) {
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log.error("上传文件格式不正确");
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}
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List<T> dataList = new ArrayList<>();
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Workbook workbook = null;
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try {
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InputStream is = file.getInputStream();
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if (fileName.endsWith(EXCEL2007)) {
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// FileInputStream is = new FileInputStream(new File(path));
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workbook = new XSSFWorkbook(is);
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}
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if (fileName.endsWith(EXCEL2003)) {
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// FileInputStream is = new FileInputStream(new File(path));
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workbook = new HSSFWorkbook(is);
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}
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if (workbook != null) {
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//类映射 注解 value-->bean columns
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Map<String, List<Field>> classMap = new HashMap<>();
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List<Field> fields = Stream.of(cls.getDeclaredFields()).collect(Collectors.toList());
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fields.forEach(
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field -> {
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ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
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if (annotation != null) {
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String value = annotation.value();
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if (StringUtils.isBlank(value)) {
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return;//return起到的作用和continue是相同的 语法
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}
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if (!classMap.containsKey(value)) {
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classMap.put(value, new ArrayList<>());
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}
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field.setAccessible(true);
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classMap.get(value).add(field);
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}
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}
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);
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//索引-->columns
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Map<Integer, List<Field>> reflectionMap = new HashMap<>(16);
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//默认读取第一个sheet
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Sheet sheet = workbook.getSheetAt(0);
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boolean firstRow = true;
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for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) {
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Row row = sheet.getRow(i);
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//首行 提取注解
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if (firstRow) {
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for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
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Cell cell = row.getCell(j);
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String cellValue = getCellValue(cell);
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if (classMap.containsKey(cellValue)) {
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reflectionMap.put(j, classMap.get(cellValue));
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}
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}
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firstRow = false;
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} else {
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//忽略空白行
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if (row == null) {
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continue;
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}
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try {
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T t = cls.newInstance();
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//判断是否为空白行
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boolean allBlank = true;
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for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
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if (reflectionMap.containsKey(j)) {
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Cell cell = row.getCell(j);
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String cellValue = getCellValue(cell);
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if (StringUtils.isNotBlank(cellValue)) {
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allBlank = false;
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}
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List<Field> fieldList = reflectionMap.get(j);
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fieldList.forEach(
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x -> {
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try {
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handleField(t, cellValue, x);
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} catch (Exception e) {
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log.error(String.format("reflect field:%s value:%s exception!", x.getName(), cellValue), e);
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}
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}
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);
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}
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}
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if (!allBlank) {
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dataList.add(t);
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} else {
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log.warn(String.format("row:%s is blank ignore!", i));
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}
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} catch (Exception e) {
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log.error(String.format("parse row:%s exception!", i), e);
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}
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}
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}
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}
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} catch (Exception e) {
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log.error(String.format("parse excel exception!"), e);
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} finally {
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if (workbook != null) {
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try {
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workbook.close();
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} catch (Exception e) {
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log.error(String.format("parse excel exception!"), e);
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}
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}
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}
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return dataList;
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}
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private static <T> void handleField(T t, String value, Field field) throws Exception {
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Class<?> type = field.getType();
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if (type == null || type == void.class || StringUtils.isBlank(value)) {
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return;
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}
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if (type == Object.class) {
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field.set(t, value);
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//数字类型
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} else if (type.getSuperclass() == null || type.getSuperclass() == Number.class) {
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if (type == int.class || type == Integer.class) {
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field.set(t, NumberUtils.toInt(value));
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} else if (type == long.class || type == Long.class) {
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field.set(t, NumberUtils.toLong(value));
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} else if (type == byte.class || type == Byte.class) {
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field.set(t, NumberUtils.toByte(value));
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} else if (type == short.class || type == Short.class) {
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field.set(t, NumberUtils.toShort(value));
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} else if (type == double.class || type == Double.class) {
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field.set(t, NumberUtils.toDouble(value));
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} else if (type == float.class || type == Float.class) {
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field.set(t, NumberUtils.toFloat(value));
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} else if (type == char.class || type == Character.class) {
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field.set(t, CharUtils.toChar(value));
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} else if (type == boolean.class) {
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field.set(t, BooleanUtils.toBoolean(value));
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} else if (type == BigDecimal.class) {
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field.set(t, new BigDecimal(value));
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}
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} else if (type == Boolean.class) {
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field.set(t, BooleanUtils.toBoolean(value));
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} else if (type == Date.class) {
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//
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field.set(t, value);
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} else if (type == String.class) {
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field.set(t, value);
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} else {
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Constructor<?> constructor = type.getConstructor(String.class);
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field.set(t, constructor.newInstance(value));
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}
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}
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private static String getCellValue(Cell cell) {
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if (cell == null) {
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return "";
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}
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if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
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// if (DateUtil.checkDateFormat(cell.getNumericCellValue() + "", Constants.DATE_TIME_FORMAT_NUM)) {
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// return HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString();
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// } else {
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// return new BigDecimal(cell.getNumericCellValue()).toString();
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// }
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return cell.getNumericCellValue() + "";
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} else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
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return StringUtils.trimToEmpty(cell.getStringCellValue());
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} else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
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return StringUtils.trimToEmpty(cell.getCellFormula());
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} else if (cell.getCellType() == Cell.CELL_TYPE_BLANK) {
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return "";
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} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
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return String.valueOf(cell.getBooleanCellValue());
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} else if (cell.getCellType() == Cell.CELL_TYPE_ERROR) {
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return "ERROR";
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} else {
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return cell.toString().trim();
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}
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}
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public static <T> void writeExcel(HttpServletResponse response, List<T> dataList, Class<T> cls){
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Field[] fields = cls.getDeclaredFields();
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List<Field> fieldList = Arrays.stream(fields)
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.filter(field -> {
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ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
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if (annotation != null && annotation.col() > 0) {
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field.setAccessible(true);
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return true;
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}
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return false;
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}).sorted(Comparator.comparing(field -> {
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int col = 0;
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ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
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if (annotation != null) {
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col = annotation.col();
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}
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return col;
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})).collect(Collectors.toList());
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Workbook wb = new XSSFWorkbook();
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Sheet sheet = wb.createSheet(getSheetName());
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AtomicInteger ai = new AtomicInteger();
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{
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Row row = sheet.createRow(ai.getAndIncrement());
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AtomicInteger aj = new AtomicInteger();
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//写入头部
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fieldList.forEach(field -> {
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ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
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String columnName = "";
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if (annotation != null) {
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columnName = annotation.value();
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}
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Cell cell = row.createCell(aj.getAndIncrement());
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CellStyle cellStyle = wb.createCellStyle();
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cellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
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cellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
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cellStyle.setAlignment(CellStyle.ALIGN_CENTER);
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Font font = wb.createFont();
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font.setBoldweight(Font.BOLDWEIGHT_NORMAL);
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cellStyle.setFont(font);
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cell.setCellStyle(cellStyle);
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cell.setCellValue(columnName);
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});
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}
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if (CollectionUtils.isNotEmpty(dataList)) {
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dataList.forEach(t -> {
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Row row1 = sheet.createRow(ai.getAndIncrement());
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AtomicInteger aj = new AtomicInteger();
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fieldList.forEach(field -> {
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Class<?> type = field.getType();
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Object value = "";
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try {
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value = field.get(t);
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} catch (Exception e) {
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e.printStackTrace();
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}
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Cell cell = row1.createCell(aj.getAndIncrement());
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if (value != null) {
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if (type == Date.class) {
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cell.setCellValue(value.toString());
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} else {
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cell.setCellValue(value.toString());
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}
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cell.setCellValue(value.toString());
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}
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});
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});
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}
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//冻结窗格
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wb.getSheet(getSheetName()).createFreezePane(0, 1, 0, 1);
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//浏览器下载excel
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buildExcelDocument(getFileName() + "_" + DateUtil.nowDate(Constants.DATE_TIME_FORMAT_NUM) +".xlsx", wb, response);
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//生成excel文件
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// buildExcelFile(".\\default.xlsx",wb);
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}
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/**
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* 浏览器下载excel
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* @param fileName
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* @param wb
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* @param response
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*/
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private static void buildExcelDocument(String fileName, Workbook wb,HttpServletResponse response){
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try {
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response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
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response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));
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response.flushBuffer();
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wb.write(response.getOutputStream());
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* 生成excel文件
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* @param path 生成excel路径
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* @param wb
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*/
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private static void buildExcelFile(String path, Workbook wb){
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File file = new File(path);
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if (file.exists()) {
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file.delete();
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}
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try {
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wb.write(new FileOutputStream(file));
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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