文章目录
Apache POI对Excel的基本操作
code目录
- com.gaolei.excelpoi
- controller
- BaseController.java 将数据库数据导出excel文件
- excel
- a. WriterExcel.java 插入数据
- b. ReadExcel.java 读取数据
- c. FormulaExcel.java 插入数据（公式计算）
- d. ReadWithFormula.java 读取数据（公式计算）
环境
- IntelliJ IDEA 2018.2
- JDK 1.8
- SpringBoot 2.1.9.RELEASE
- POI 3.9
Maven 依赖
<dependencies>
<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>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.9</version>
</dependency>
</dependencies>
插入数据Excel
public class WriterExcel {
public static void main(String[] args) {
// 1. 创建工作簿
XSSFWorkbook workbook = new XSSFWorkbook();
// 2. 创建工作表
XSSFSheet sheet = workbook.createSheet("WriterDataTest");
// 3. 模拟待写入数据
Map<String,Object[]> data = new TreeMap<>();
data.put("1", new Object[] {"ID", "NAME", "LASTNAME"});
data.put("2", new Object[] {1, "Amit", "Shukla"});
data.put("3", new Object[] {2, "Lokesh", "Gupta"});
data.put("4", new Object[] {3, "John", "Adwards"});
data.put("5", new Object[] {4, "Brian", "Schultz"});
//4. 遍历数据写入表中
Set<String> keySet = data.keySet();
int rowNum = 0;
for (String key : keySet){
Row row = sheet.createRow(rowNum++);
Object [] objArr = data.get(key);
int cellNum = 0;
for (Object obj: objArr){
Cell cell = row.createCell(cellNum++);
if (obj instanceof String){
cell.setCellValue((String)obj);
}else if(obj instanceof Integer){
cell.setCellValue((Integer)obj);
}
}
}
try {
File file = new File("Test.xlsx");
FileOutputStream out = new FileOutputStream(file);
workbook.write(out);
} catch (Exception e) {
e.printStackTrace();
}
}
}
读取数据Excel
public class ReadExcel {
public static void main(String[] args) {
try {
FileInputStream file = new FileInputStream(new File("Test.xlsx"));
//使用Test.xlsx文件创建工作簿对象
XSSFWorkbook workbook = new XSSFWorkbook(file);
//获取第一个sheet内容
XSSFSheet sheet = workbook.getSheetAt(0);
// 逐行遍历
Iterator<Row> rowIterable = sheet.iterator();
while (rowIterable.hasNext()){
Row row = rowIterable.next();
// 逐列遍历
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()){
Cell cell = cellIterator.next();
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC:
System.out.println(cell.getNumericCellValue() + "t");
break;
case Cell.CELL_TYPE_STRING:
System.out.println(cell.getStringCellValue() + "t");
break;
}
}
System.out.println("");
}
file.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
插入带公式计算Excel
public class FormulaExcel {
public static void main(String[] args) {
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("CalcSimple");
Row header = sheet.createRow(0);
header.createCell(0).setCellValue("箱数");
header.createCell(1).setCellValue("单价");
header.createCell(2).setCellValue("个数");
header.createCell(3).setCellValue("总价格");
Row dataRow = sheet.createRow(1);
dataRow.createCell(0).setCellValue(10);
dataRow.createCell(1).setCellValue(2.5);
dataRow.createCell(2).setCellValue(10);
dataRow.createCell(3).setCellFormula("A2*B2*C2");
FileOutputStream out = null;
try {
out = new FileOutputStream(new File("formulaTest.xlsx"));
workbook.write(out);
out.close();
System.out.println("Excel with formula cells written successfully");
} catch (Exception e) {
e.printStackTrace();
}
}
}
读取带公式计算的Excel
public class ReadWithFormula {
public static void main(String[] args) {
XSSFWorkbook workbook = new XSSFWorkbook();
try {
FileInputStream file = new FileInputStream(new File("formulaTest.xlsx"));
FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
XSSFSheet sheet = workbook.getSheetAt(0);
// 遍历Row
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()){
Row row = rowIterator.next();
// 遍历Cell
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()){
Cell cell = cellIterator.next();
switch (evaluator.evaluateInCell(cell).getCellType()){
case Cell.CELL_TYPE_NUMERIC:
System.out.println(cell.getNumericCellValue() + "tt");
break;
case Cell.CELL_TYPE_STRING:
System.out.println(cell.getStringCellValue() + "tt");
break;
case Cell.CELL_TYPE_FORMULA:
break;
}
}
System.out.println("");
}
file.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}格式化Excel
单元格值在一定范围内
值在配置范围[50-70]内的任何单元格着色
public class FomatExcel {
public static final Integer NUM = 100;
public static void main(String[] args) throws Exception {
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("单元格样式");
formatByValue(sheet);
FileOutputStream out = new FileOutputStream("styleDemo.xlsx");
workbook.write(out);
out.close();
}
public static void formatByValue(Sheet sheet){
Random random = new Random();
for (int i = 0; i < NUM; i++) {
sheet.createRow(i).createCell(0).setCellValue(random.nextInt(100));
}
// 获取格式化对象
SheetConditionalFormatting conditionalFormatting = sheet.getSheetConditionalFormatting();
//设置格式化条件，条件1
ConditionalFormattingRule rule1 = conditionalFormatting.createConditionalFormattingRule(ComparisonOperator.GT,"70");
PatternFormatting patternFormatting1 = rule1.createPatternFormatting();
patternFormatting1 .setFillBackgroundColor(IndexedColors.BLUE.index);
patternFormatting1.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
// 条件2
ConditionalFormattingRule rule2 = conditionalFormatting.createConditionalFormattingRule(ComparisonOperator.LT,"50");
PatternFormatting patternFormatting2 = rule2.createPatternFormatting();
patternFormatting2 .setFillBackgroundColor(IndexedColors.RED.index);
patternFormatting2.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
// 列格式范围
CellRangeAddress[] range = {
CellRangeAddress.valueOf("A1:A100")
};
conditionalFormatting.addConditionalFormatting(range,rule1,rule2);
}
}
交替行变色
public static void formatByColor(Sheet sheet) {
SheetConditionalFormatting sheetCF = sheet.getSheetConditionalFormatting();
ConditionalFormattingRule rule = sheetCF.createConditionalFormattingRule("MOD(ROW(),2)");
PatternFormatting fill = rule.createPatternFormatting();
fill.setFillBackgroundColor(IndexedColors.LIGHT_GREEN.index);
fill.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
CellRangeAddress[] regions = {
CellRangeAddress.valueOf("A1:Z100")
};
sheetCF.addConditionalFormatting(regions, rule);
sheet.createRow(0).createCell(1).setCellValue("交替行变色，绿色填充");
sheet.createRow(1).createCell(1).setCellValue("条件：MOD(ROW(),2)");
}
设置到期时间
public static void expiryInNext30Days(Sheet sheet)
{
CellStyle style = sheet.getWorkbook().createCellStyle();
style.setDataFormat((short)BuiltinFormats.getBuiltinFormat("d-mmm"));
sheet.createRow(0).createCell(0).setCellValue("日期");
sheet.createRow(1).createCell(0).setCellFormula("TODAY()+29");
sheet.createRow(2).createCell(0).setCellFormula("A2+1");
sheet.createRow(3).createCell(0).setCellFormula("A3+1");
for(int rownum = 1; rownum <= 3; rownum++) sheet.getRow(rownum).getCell(0).setCellStyle(style);
SheetConditionalFormatting sheetCF = sheet.getSheetConditionalFormatting();
ConditionalFormattingRule rule1 = sheetCF.createConditionalFormattingRule("AND(A2-TODAY()>=0,A2-TODAY()<=30)");
FontFormatting font = rule1.createFontFormatting();
font.setFontStyle(false, true);
font.setFontColorIndex(IndexedColors.BLUE.index);
CellRangeAddress[] regions = {
CellRangeAddress.valueOf("A2:A4")
};
sheetCF.addConditionalFormatting(regions, rule1);
sheet.getRow(0).createCell(1).setCellValue("样式将在30后到期");
}
}
将数据库数据写入Excel并下载
Controller code
@PostMapping("user/export")
@ResponseBody
@ApiOperation(value="导出用户", httpMethod = "POST",produces="application/json",notes = "导出用户")
public ResultBean exportUser(HttpServletResponse response) throws IOException{
List<SysUser> userList = sysUserService.getUserList(); // 获取用户数据
Map<String, String> fieldMap = new LinkedHashMap<String, String>(); // 数据列信息
fieldMap.put("id", "编号");
fieldMap.put("name", "姓名");
fieldMap.put("pwd", "密码");
fieldMap.put("tel", "电话");
fieldMap.put("code", "编码");
fieldMap.put("comment", "备注");
XSSFWorkbook workbook = new XSSFWorkbook(); // 新建工作簿对象
XSSFSheet sheet = workbook.createSheet("UserList");// 创建sheet
int rowNum = 0;
Row row = sheet.createRow(rowNum);// 创建第一行对象,设置表标题
Cell cell;
int cellNum = 0;
for (String name:fieldMap.values()){
cell = row.createCell(cellNum);
cell.setCellValue(name);
cellNum++;
}
int rows = 1;
for (SysUser user: userList){//遍历数据插入excel中
row = sheet.createRow(rows);
int col = 0;
row.createCell(col).setCellValue(user.getId()); // 编号id
row.createCell(col+1).setCellValue(user.getName()); // 姓名Name
row.createCell(col+2).setCellValue(user.getPwd()); // 密码pwd
row.createCell(col+3).setCellValue(user.getTel()); // 电话tel
row.createCell(col+4).setCellValue(user.getCode()); // 编码
row.createCell(col+5).setCellValue(user.getComment()); // 备注comment
rows++;
}
String fileName = "userInfo";
OutputStream out =null;
try {
out = response.getOutputStream();
response.reset();
response.addHeader("Content-Disposition", "attachment; filename=" + fileName + ".xlsx");
response.setContentType("application/vnd.ms-excel;charset=utf-8");
workbook.write(out);
} catch (Exception e) {
e.printStackTrace();
}finally {
out.flush();
out.close();
}
return ResultBean.success();
}Swagger测试
Success实现了poi的基本操作啦>_<
