POI依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.9</version>
</dependency>
模板文件
点此下载模板文件，内容截图如下
报表生成类
package com.xuanyuv.report;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* 报表生成类
* ---------------------------------------------------------------------------
* 这里要用到：poi-3.9-20121203.jar和poi-ooxml-3.9-20121203.jar
* ---------------------------------------------------------------------------
* Created by 玄玉<https://www.xuanyuv.com/> on 2013/7/5 21:54.
*/
public enum ExcelReport {
INSTANCE;
/** 报表模板文件完整路径 */
private static final String REPORT_TEMPLATE_FILE_FULLPATH = "/templates/settleorder/ReportTemplate.xls";
/** 初始行的下标（指的是填充数据的第一个单元格下标） */
private int initRowIndex;
/** 初始列的下标（指的是填充数据的第一个单元格下标）*/
private int initColIndex;
/** 当前行的下标（指的是填充数据的当前单元格下标） */
private int currRowIndex;
/** 当前列的下标（指的是填充数据的当前单元格下标） */
private int currColIndex;
/** 最后一行的下标 */
private int lastRowIndex;
/** 序号列的第一个单元格的下标 */
private int serialColIndex;
/** 默认行高（指的是填充数据的第一个单元格的行高） */
private float defaultRowHeight;
/** 本列开始填充序号的标识 */
private static final String SERIAL_NO = "serialNo";
/** 本行开始填充数据的标识 */
private static final String DATA_BEGIN = "dataBegin";
/** 表格采用同列样式的标识 */
private static final String USE_STYLES = "useStyles";
/** 表格样式采用的默认样式 */
private static final String DEFAULT_STYLES = "defaultStyles";
/** 表格样式采用的默认样式的ID */
private static final int DEFAULT_STYLES_ID = 99;
/** 存放模板中所有表格样式（键为99表示表格的默认样式） */
private Map<Integer, CellStyle> allCellStyle = new HashMap<>();
private Row currRow;
private Sheet sheet;
private Workbook wb;
/**
* 基础数据初始化
*/
ExcelReport(){
try {
//从指定目录中读取
//wb = WorkbookFactory.create(new File(REPORT_TEMPLATE_FILE_FULLPATH));
//从classpath中读取模板文档
wb = WorkbookFactory.create(ExcelReport.class.getResourceAsStream(REPORT_TEMPLATE_FILE_FULLPATH));
//获取模板中的第一个Sheet
sheet = wb.getSheetAt(0);
} catch (Exception e) {
throw new RuntimeException("加载报表模板文件发生异常，堆栈轨迹如下", e);
}
for(Row row : sheet){
for(Cell cell : row){
//报表模板文件中约定：serialNo、dataBegin、useStyles、defaultStyles等都是String类型的
if(Cell.CELL_TYPE_STRING != cell.getCellType()){
continue;
}
String str = cell.getStringCellValue().trim();
//收集默认的表格样式
if(DEFAULT_STYLES.equals(str)){
this.allCellStyle.put(DEFAULT_STYLES_ID, cell.getCellStyle());
}
//收集除默认表格样式以外的所有表格样式
if(USE_STYLES.equals(str)){
this.allCellStyle.put(cell.getColumnIndex(), cell.getCellStyle());
}
//定位序号列的第一个单元格下标
if(SERIAL_NO.equals(str)){
this.serialColIndex = cell.getColumnIndex();
}
//定位开始填充数据的第一个单元格的下标
if(DATA_BEGIN.equals(str)){
this.initColIndex = cell.getColumnIndex();
this.initRowIndex = row.getRowNum();
this.currColIndex = this.initColIndex;
this.currRowIndex = this.initRowIndex;
this.lastRowIndex = sheet.getLastRowNum();
this.defaultRowHeight = row.getHeightInPoints();
}
}
}
}
/**
* 创建行
*/
public void createNewRow(){
//下移行的条件有2个：当前行非初始行，且当前行没有超过最后一行
if(this.currRowIndex!=this.initRowIndex && this.currRowIndex<this.lastRowIndex){
//将指定的几行进行下移一行
sheet.shiftRows(this.currRowIndex, this.lastRowIndex, 1, true, true);
//既然下移了那么最后一行下标就也要增大了
this.lastRowIndex++;
}
//在指定的行上创建一个空行（如果此行原本有单元格和数据，那么也会被空行覆盖，且创建出来的空行是没有单元格的）
this.currRow = sheet.createRow(this.currRowIndex);
this.currRow.setHeightInPoints(this.defaultRowHeight);
this.currRowIndex++;
this.currColIndex = this.initColIndex;
}
/**
* 创建单元格并填充数据
*/
public void buildCell(String value){
Cell cell = this.currRow.createCell(this.currColIndex);
if(this.allCellStyle.containsKey(this.currColIndex)){
cell.setCellStyle(this.allCellStyle.get(this.currColIndex));
}else{
cell.setCellStyle(this.allCellStyle.get(DEFAULT_STYLES_ID));
}
cell.setCellValue(value);
this.currColIndex++;
}
/**
* 插入序号
*/
private void insertSerialNo(){
int index = 1;
Row row;
Cell cell;
for(int i=this.initRowIndex; i<this.currRowIndex; i++){
row = sheet.getRow(i);
cell = row.createCell(this.serialColIndex);
cell.setCellValue(index++);
}
}
/**
* 替换模板文件中的常量
*/
private void replaceConstantData(){
Map<String, String> constantData = new HashMap<>();
constantData.put("#title", "优秀学生名单");
constantData.put("#date", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
constantData.put("#developer", "玄玉<https://www.xuanyuv.com/>");
for(Row row : sheet){
for(Cell cell : row){
if(Cell.CELL_TYPE_STRING != cell.getCellType()){
continue;
}
String str = cell.getStringCellValue().trim();
if(str.startsWith("#") && constantData.containsKey(str)){
cell.setCellValue(constantData.get(str));
}
}
}
}
/**
* 将生成的excel文件写到输出流中（适用于文件下载）
*/
public void writeToStream(OutputStream os){
this.insertSerialNo();
this.replaceConstantData();
try {
wb.write(os);
} catch (Exception e) {
throw new RuntimeException("Workbook写入流失败，堆栈轨迹如下", e);
}
}
/**
* 将生成的excel文件写到指定的文件中（适用于本地保存）
*/
public void writeToFile(String filepath){
this.insertSerialNo();
this.replaceConstantData();
try (FileOutputStream fos = new FileOutputStream(filepath)) {
wb.write(fos);
} catch (Exception e) {
throw new RuntimeException("Workbook写入文件失败，堆栈轨迹如下", e);
}
}
}
单元测试类
package com.xuanyuv.test;
import com.xuanyuv.report.ExcelReport;
import org.junit.Assert;
import org.junit.Test;
import java.io.File;
public class ExcelReportTest {
@Test
public void testExcelReportUtil(){
ExcelReport eru = ExcelReport.INSTANCE;
eru.createNewRow();
eru.buildCell("aa");
eru.buildCell("玄玉");
eru.buildCell("cc");
eru.buildCell("dd");
eru.createNewRow();
eru.buildCell("aa");
eru.buildCell("https://www.xuanyuv.com/");
eru.buildCell("cc");
eru.buildCell("dd");
eru.createNewRow();
eru.buildCell("aa");
eru.buildCell("蓄机而动");
eru.buildCell("cc");
eru.buildCell("dd");
eru.writeToFile("D:/test.xls");
Assert.assertTrue(new File("D:/test.xls").exists());
}
}
另附POIReadDemo
package com.xuanyuv.seed;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
/**
* POI读Excel的示例
* ---------------------------------------------------------------------------
* 这里用到了：poi-4.1.0.jar、poi-ooxml-4.1.0.jar
* ---------------------------------------------------------------------------
* Created by 玄玉<https://www.xuanyuv.com/> on 2013/7/9 19:54.
*/
public class POIReadDemo {
public static void main(String[] args) throws IOException {
read();
}
public static void read() throws IOException {
long startTime = System.currentTimeMillis();
int count = 0;
//老版本POI是使用这种方式创建Workbook的，新版本中可以使用WorkbookFactory，它能自动根据文档的类型打开一个Excel
//Workbook wb = new HSSFWorkbook(new FileInputStream("D:/5月业务定制对账文件汇总.xls"));
Workbook wb = WorkbookFactory.create(new File("D:/5月业务定制对账文件汇总.xls"));
//获取Excel中的某一个数据表，也可以通过Sheet名称来获取：Workbook.getSheet("定制对账文件")
Sheet sheet = wb.getSheetAt(0);
Row row;
//获取Excel的总行数：Sheet.getLastRowNum()+1（注意需要加一）
for(/*int i=0*/ int i=sheet.getFirstRowNum(); i<sheet.getLastRowNum()+1; i++){
//获取数据表里面的某一行
row = sheet.getRow(i);
//获取Excel的总列数：Row.getLastCellNum()（不用加一）
for(/*int j=0*/ int j=row.getFirstCellNum(); j<row.getLastCellNum(); j++){
//获取一行中的一个单元格
String cellData = getCellValue(row.getCell(j)).trim();
System.out.print(j == 0 ? count + 1 + "----" + cellData + "----" : cellData + "----");
}
count++;
//打印完一行的数据之后，再输入一个空行
System.out.println();
}
long endTime = System.currentTimeMillis();
long useTime = endTime - startTime;
System.out.println("导入文件完毕，导入数据[" + count + "]条，耗时" + useTime + "ms");
String suffix = String.valueOf(useTime % 1000);
while(suffix.endsWith("0")){
suffix = suffix.substring(0, suffix.length()-1);
}
System.out.println("导入文件完毕，导入数据[" + count + "]条，耗时" + (useTime/1000) + "." + suffix + "秒");
}
/**
* for-each读取Excel
*/
public static void readByForeach() throws IOException {
for(Row row : WorkbookFactory.create(new File("D:/5月业务定制对账文件汇总.xls")).getSheetAt(0)){
for(Cell cell : row){
System.out.print(getCellValue(cell) + "----");
}
System.out.println();
}
}
/**
* 获取单元格的值
*/
private static String getCellValue(Cell cell){
String data;
if(CellType.NUMERIC.equals(cell.getCellType())){
//根据实际值的格式来决定，其中数字格式需要处理一下科学计数法问题
if(DateUtil.isCellDateFormatted(cell)){
data = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(cell.getDateCellValue());
}else{
data = new DecimalFormat("0").format(cell.getNumericCellValue());
}
}else if(CellType.BLANK.equals(cell.getCellType())){
data = "";
}else if(CellType.ERROR.equals(cell.getCellType())){
data = "ERROR";
}else if(CellType.STRING.equals(cell.getCellType())){
data = cell.getStringCellValue();
}else if(CellType.BOOLEAN.equals(cell.getCellType())){
data = String.valueOf(cell.getBooleanCellValue());
}else if(CellType.FORMULA.equals(cell.getCellType())){
data = String.valueOf(cell.getCellFormula());
}else{
data = null==cell.getRichStringCellValue() ? "" : cell.getRichStringCellValue().toString();
}
//return data.trim();
return data;
}
}
另附POIWriteDemo
package com.xuanyuv.seed;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import java.io.FileOutputStream;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* POI读写Excel的示例
* ---------------------------------------------------------------------------
* 这里用到了：poi-4.1.0.jar、poi-ooxml-4.1.0.jar
* ---------------------------------------------------------------------------
* Created by 玄玉<https://www.xuanyuv.com/> on 2013/7/9 19:54.
*/
public class POIWriteDemo {
public static void main(String[] args) throws IOException {
write();
}
public static void write() throws IOException {
//准备数据
List<Object[]> rowList = new ArrayList<>();
//表头
String[] rowName = new String[]{"凭证日期", "会计年度", "会计期间", "凭证字", "凭证号", "科目代码", "科目名称", "币别代码", "币别名称", "原币金额", "借方", "贷方", "凭证摘要", "参考信息", "业务日期", "分录序号", "核算项目", "过账", "机制凭证"};
rowList.add(rowName);
//表数据
for(int i=0; i<3; i++){
Object[] row = new Object[37];
row[0] = DateFormatUtils.format(new Date(), "MM-dd-yyyy");
row[1] = DateFormatUtils.format(new Date(), "yyyy");
row[2] = DateFormatUtils.format(new Date(), "MM");
row[3] = "记";
row[4] = 1;
row[5] = "1107.01";
row[6] = "未到期利息-个人消费贷款";
row[7] = "RMB";
row[8] = "人民币";
row[9] = new BigDecimal("20.12");
row[10] = new BigDecimal("20.12");
row[11] = BigDecimal.ZERO;
row[12] = DateFormatUtils.format(new Date(), "MM月dd日");
row[13] = "SE";
row[14] = DateFormatUtils.format(new Date(), "MM/dd/yyyy");
row[15] = i;
row[16] = "部门---002.023---B-重庆总部||产品---1101---1101贷款";
row[17] = "0";
row[18] = "";
rowList.add(row);
}
//生成Excel
write(rowList, "测试Sheet_01", "D:\\data\\测试的Excel.xls");
}
/**
* 写入数据到excel
* @param rowList 填充到excel中的每一行的数据
* @param sheetname excel的Sheet名称
* @param pathname 生成的excel文件完整路径（含目录和后缀）
*/
private static void write(List<Object[]> rowList, String sheetname, String pathname) throws IOException {
//创建一个Excel
//Workbook wb = new XSSFWorkbook();
Workbook wb = new HSSFWorkbook();
//构建样式
CellStyle style = buildStyle(wb);
//创建表格
Sheet sheet = wb.createSheet(sheetname);
//创建行
for(int i=0, len=rowList.size(); i<len; i++){
Row row = sheet.createRow(i);
Object[] objs = rowList.get(i);
for(int j=0; j<objs.length; j++){
Cell cell;
//根据填充数据的不同类型，创建不同的单元格
if(objs[j] instanceof Integer){
cell = row.createCell(j, CellType.NUMERIC);
cell.setCellValue((int)objs[j]);
}else if(objs[j] instanceof Double){
cell = row.createCell(j, CellType.NUMERIC);
cell.setCellValue((double)objs[j]);
}else{
cell = row.createCell(j, CellType.STRING);
if(null == objs[j]){
cell.setCellValue(new HSSFRichTextString());
} else {
cell.setCellValue(new HSSFRichTextString(objs[j].toString()));
}
}
//设定样式
cell.setCellStyle(style);
}
}
//校验目录
File file = new File(pathname);
if(file.isDirectory()){
throw new IOException("File '" + file + "' should not be a directory");
}
FileUtils.forceMkdirParent(file);
//写入文件
FileOutputStream fos = new FileOutputStream(file);
wb.write(fos);
fos.close();
wb.close();
}
/**
* 构建单元格样式
*/
private static CellStyle buildStyle(Workbook workbook) {
Font font = workbook.createFont();
////字体加粗
//font.setBold(true);
//字体名字
font.setFontName("宋体");
//字体大小
font.setFontHeightInPoints((short)10);
CellStyle style = workbook.createCellStyle();
//边框
style.setBorderBottom(BorderStyle.NONE);
style.setBorderLeft(BorderStyle.NONE);
style.setBorderRight(BorderStyle.NONE);
style.setBorderTop(BorderStyle.NONE);
//边框颜色
style.setBottomBorderColor(HSSFColor.HSSFColorPredefined.AUTOMATIC.getIndex());
style.setLeftBorderColor(HSSFColor.HSSFColorPredefined.AUTOMATIC.getIndex());
style.setRightBorderColor(HSSFColor.HSSFColorPredefined.AUTOMATIC.getIndex());
style.setTopBorderColor(HSSFColor.HSSFColorPredefined.AUTOMATIC.getIndex());
//设置字体
style.setFont(font);
//设置自动换行
style.setWrapText(false);
////设置水平对齐居中
//style.setAlignment(HorizontalAlignment.CENTER);
//设置垂直对齐对准底部
style.setVerticalAlignment(VerticalAlignment.BOTTOM);
return style;
}
}