springboot中使用poi匯出excel
阿新 • • 發佈：2019-12-31
環境
- IntelliJ IDEA 2018.2
- JDK 1.8
- SpringBoot 2.1.9.RELEASE
- POI 3.9
Maven 依賴
<dependencies>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.9</version>
</dependency 插入資料Excel
public class WriterExcel {
public static void main(String[] args) {
// 1. 建立工作簿
XSSFWorkbook workbook = new 
讀取資料Excel
public class ReadExcel {
public static void main(String[] args) {
try {
FileInputStream file = new FileInputStream(new File("Test.xlsx"));
//使用Test.xlsx檔案建立工作簿物件
XSSFWorkbook workbook = new XSSFWorkbook(file);
//獲取第一個sheet內容
XSSFSheet sheet = workbook.getSheetAt(0);
// 逐行遍歷
Iterator<Row> rowIterable = sheet.iterator();
while (rowIterable.hasNext()){
Row row = rowIterable.next();
// 逐列遍歷
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();
}
}
}
複製程式碼
插入帶公式計算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("箱數");
header.createCell(1).setCellValue("單價");
header.createCell(2).setCellValue("個數");
header.createCell(3).setCellValue("總價格");
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();
}
}
}
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讀取帶公式計算的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);
// 遍歷Row
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext()){
Row row = rowIterator.next();
// 遍歷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();
}
}
}
複製程式碼格式化Excel
單元格值在一定範圍內
值在配置範圍[50-70]內的任何單元格著色
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("單元格樣式");
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));
}
// 獲取格式化物件
SheetConditionalFormatting conditionalFormatting = sheet.getSheetConditionalFormatting();
//設定格式化條件，條件1
ConditionalFormattingRule rule1 = conditionalFormatting.createConditionalFormattingRule(ComparisonOperator.GT,"70");
PatternFormatting patternFormatting1 = rule1.createPatternFormatting();
patternFormatting1 .setFillBackgroundColor(IndexedColors.BLUE.index);
patternFormatting1.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
// 條件2
ConditionalFormattingRule rule2 = conditionalFormatting.createConditionalFormattingRule(ComparisonOperator.LT,"50");
PatternFormatting patternFormatting2 = rule2.createPatternFormatting();
patternFormatting2 .setFillBackgroundColor(IndexedColors.RED.index);
patternFormatting2.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
// 列格式範圍
CellRangeAddress[] range = {
CellRangeAddress.valueOf("A1:A100")
};
conditionalFormatting.addConditionalFormatting(range,rule1,rule2);
}
}
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交替行變色
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("交替行變色，綠色填充");
sheet.createRow(1).createCell(1).setCellValue("條件：MOD(ROW(),2)");
}
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設定到期時間
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("樣式將在30後到期");
}
}
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將資料庫資料寫入Excel並下載
Controller code
@PostMapping("user/export")
@ResponseBody
@ApiOperation(value="匯出使用者",httpMethod = "POST",produces="application/json",notes = "匯出使用者")
public ResultBean exportUser(HttpServletResponse response) throws IOException{
List<SysUser> userList = sysUserService.getUserList(); // 獲取使用者資料
Map<String,String> fieldMap = new LinkedHashMap<String,String>(); // 資料列資訊
fieldMap.put("id","編號");
fieldMap.put("name","姓名");
fieldMap.put("pwd","密碼");
fieldMap.put("tel","電話");
fieldMap.put("code","編碼");
fieldMap.put("comment","備註");
XSSFWorkbook workbook = new XSSFWorkbook(); // 新建工作簿物件
XSSFSheet sheet = workbook.createSheet("UserList");// 建立sheet
int rowNum = 0;
Row row = sheet.createRow(rowNum);// 建立第一行物件,設定表標題
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){//遍歷資料插入excel中
row = sheet.createRow(rows);
int col = 0;
row.createCell(col).setCellValue(user.getId()); // 編號id
row.createCell(col+1).setCellValue(user.getName()); // 姓名Name
row.createCell(col+2).setCellValue(user.getPwd()); // 密碼pwd
row.createCell(col+3).setCellValue(user.getTel()); // 電話tel
row.createCell(col+4).setCellValue(user.getCode()); // 編碼
row.createCell(col+5).setCellValue(user.getComment()); // 備註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();
}
複製程式碼Swagger測試
Success實現了poi的基本操作啦>_<