java封装实现Excel建表读写操作

对 Excel 进行读写操作是生产环境下常见的业务，网上搜索的实现方式都是基于POI和JXL第三方框架，但都不是很全面。小编由于这两天刚好需要用到，于是就参考手写了一个封装操作工具，基本涵盖了Excel表（分有表头和无表头）的创建，并对它们进行读写操作。为方便大家，有需要者可以点击文后点解下载直接使用哦，当然也可以根据自己需求举一反三自己定制，相信对于聪明的你也不是什么难事。话不多说，直接贴源码

pom.xml 文件：

<properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.17</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.0</version><scope>provided</scope></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.8.0-beta2</version><scope>test</scope></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.8.0-beta2</version></dependency></dependencies>

建表工具类：ExcelBuider.java

 /*** 建表工具类* @author Sherman* email:1253950375@qq.com* created in 2018/8/24*/@Slf4jpublic class ExcelBuilder {private static HSSFSheet sheet;private static HSSFWorkbook wb;private static boolean hasHeader;/*** 初始化* @param excellName 表名*/public ExcelBuilder(String excellName) {wb = new HSSFWorkbook();sheet = wb.createSheet(excellName);}/***  设置表头，装配表头数据* @param value 字符串数组，用来作为表头的值**/public ExcelBuilder header(String... value) {if (value != null && value.length != 0) {//设置表头样式HSSFCellStyle cellStyle = wb.createCellStyle();cellStyle.setFont(font("黑体", true, 12));HSSFRow row = sheet.createRow(0);for (int i = 0; i < value.length; i++) {HSSFCell cell = row.createCell(i);cell.setCellValue(value[i]);cell.setCellStyle(cellStyle);}hasHeader = true;}return this;}/*** excel 表内容装配* @param content 待装配表格内容的二维数组* @return*/public ExcelBuilder content(List<List<Object>> content) {if (content != null && !content.isEmpty()) {int index;for (int i = 0; i < content.size(); i++) {index = hasHeader == false ? i : i + 1;HSSFRow row = sheet.createRow(index);for (int j = 0; j < content.get(i).size(); j++) {String r = "";Object value = content.get(i).get(j);//根据数据类型装配if (value instanceof String) {r = (String) value;} else if (value instanceof Number) {r = String.valueOf(value);} else if (value instanceof BigDecimal) {r = String.valueOf(value);} else {if (!(value instanceof Date) && !(value instanceof Timestamp)) {if (!(value instanceof ZonedDateTime) && !(value instanceof LocalDateTime)) {if (value instanceof Enum) {r = ((Enum) value).name();} else if (value != null) {log.info("Error of create row, Unknow field type: " + value.getClass().getName());}} else {DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");r = formatter.format((TemporalAccessor) value);}} else {DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");r = sdf.format(value);}}row.createCell(j).setCellValue(r);}}}return this;}/*** 自动调整列宽大小*/public ExcelBuilder autoColumnWidth() {for (int j = 0; j < sheet.getRow(0).getLastCellNum(); j++) {int maxLength = 0;for (int i = 0; i <= sheet.getLastRowNum(); i++) {String value = sheet.getRow(i).getCell(j).getStringCellValue();int length = 0;if (value != null) {length = value.getBytes().length;}if (length > maxLength) {maxLength = length;}}sheet.setColumnWidth(j, maxLength > 30 ? (30 * 256 + 186) : (maxLength * 256 + 186));}return this;}/*** 实例化* @param hasHeader 是否有表头* @return Excel表格*/public AbstractExcel build(Boolean hasHeader) {return hasHeader ? new HeaderExcel(sheet) : new NoHeaderExcel(sheet);}/**** @param fontName 字体名字* @param isBold  是否粗体* @param fontSize 字体大小* @return 字体*/private HSSFFont font(String fontName, boolean isBold, int fontSize) {HSSFFont font = wb.createFont();if (fontName != null) font.setFontName(fontName);else font.setFontName("黑体");font.setBold(isBold);font.setFontHeightInPoints((short) fontSize);return font;}}

excel的抽象父类：

/*** @author Sherman* created in 2018/8/24*/public abstract class AbstractExcel {private final HSSFSheet sheet;public AbstractExcel() {HSSFWorkbook wb = new HSSFWorkbook();sheet = wb.createSheet();}public AbstractExcel(String sheetName){HSSFWorkbook wb = new HSSFWorkbook();sheet = wb.createSheet(sheetName);}public AbstractExcel(HSSFSheet sheet) {this.sheet = sheet;}public abstract List<Map<String, String>> getPayload();public void write(OutputStream op) throws IOException {sheet.getWorkbook().write(op);sheet.getWorkbook().close();}public String getStringFormatCellValue(HSSFCell cell) {String cellVal = "";DecimalFormat df = new DecimalFormat("#");switch (cell.getCellTypeEnum()) {case STRING:cellVal = cell.getStringCellValue();break;case NUMERIC:String dataFormat = cell.getCellStyle().getDataFormatString();if (DateUtil.isCellDateFormatted(cell)) {cellVal = df.format(cell.getDateCellValue());} else if ("@".equals(dataFormat)) {cellVal = df.format(cell.getNumericCellValue());} else {cellVal = String.valueOf(cell.getNumericCellValue());df = new DecimalFormat("#.#########");cellVal = df.format(Double.valueOf(cellVal));}break;case BOOLEAN:cellVal = String.valueOf(cell.getBooleanCellValue());break;case FORMULA:cellVal = String.valueOf(cell.getCellFormula());break;default:cellVal = "";}return cellVal;}}

有表头实现类

/*** @author Sherman* created in 2018/8/24*/public class HeaderExcel extends AbstractExcel {private final static boolean hasHeader = true;private final HSSFSheet sheet;public HeaderExcel(HSSFSheet sheet) {super(sheet);this.sheet = sheet;}public HeaderExcel(String sheetName, String excelPath) {HSSFWorkbook wb = null;try {wb = new HSSFWorkbook(new POIFSFileSystem(new FileInputStream(excelPath)));} catch (IOException e) {e.printStackTrace();}sheet = sheetName == null || sheetName.isEmpty() ? wb.getSheetAt(0) : wb.getSheet(sheetName);}@Overridepublic List<Map<String, String>> getPayload() {List<Map<String, String>> payLoad = new ArrayList<>();HSSFRow headRow = sheet.getRow(0);for (int i = 1; i <= sheet.getLastRowNum(); i++) {HSSFRow currentRow = sheet.getRow(i);Map<String, String> map = new HashMap<>();for (int j = 0; j < sheet.getRow(i).getLastCellNum(); j++) {map.put(getStringFormatCellValue(headRow.getCell(j)), getStringFormatCellValue(currentRow.getCell(j)));}payLoad.add(map);}return payLoad;}}

无表头实现类

/*** @author Sherman* created in 2018/8/24*/public class NoHeaderExcel extends AbstractExcel {private final static boolean hasHeader = false;private HSSFSheet sheet;public NoHeaderExcel(HSSFSheet sheet) {super(sheet);this.sheet = sheet;}public NoHeaderExcel(String sheetName, String excelPath) {HSSFWorkbook wb = null;try {wb = new HSSFWorkbook(new POIFSFileSystem(new FileInputStream(excelPath)));} catch (IOException e) {e.printStackTrace();}sheet = sheetName == null || sheetName.isEmpty() ? wb.getSheetAt(0) : wb.getSheet(sheetName);}@Overridepublic List<Map<String, String>> getPayload() {List<Map<String, String>> payLoad = new ArrayList<>();for (int i = 0; i < sheet.getLastRowNum(); i++) {HSSFRow currentRow = sheet.getRow(i);Map<String, String> map = new HashMap<>();for (int j = 0; j <= sheet.getRow(i).getLastCellNum(); j++) {map.put(String.valueOf(j), getStringFormatCellValue(currentRow.getCell(j)));}payLoad.add(map);}return payLoad;}}

测试工具类：

/*** Unit test for simple App.*/
public class AppTest 
{/*** 测试建表，写表操作*/@Testpublic void testExportExcel(){//测试数据String[] headers = new String[]{"A","B","C","D","E"};List<List<Object>> valueList = new LinkedList<>();for (char i = 'A'; i <= 'E' ; i++) {List<Object> rowList = new LinkedList<>();for (int j = 0; j <= 4; j++) {rowList.add(i+String.valueOf(j));}valueList.add(rowList);}AbstractExcel excel = new ExcelBuilder("报名表").header(headers).content(valueList).autoColumnWidth().build(true);try {File file = new File("E:\\excel\\test.xls");FileOutputStream op = new FileOutputStream(file);excel.write(op);} catch (IOException e) {e.printStackTrace();}}/*** 测试读取表数据操作*/@Testpublic void testImportExcel(){AbstractExcel excel = new HeaderExcel(null,"E:/excel/test.xls");List<Map<String,String>> values = excel.getPayload();values.forEach(stringStringMap -> {stringStringMap.entrySet().forEach(stringStringEntry -> {System.out.println(stringStringEntry.getKey()+"---->"+stringStringEntry.getValue());});});}}