POM文件
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
<dependency>
<groupId>net.sourceforge.nekohtml</groupId>
<artifactId>nekohtml</artifactId>
<version>1.9.15</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
实体bean
@Data
@AllArgsConstructor
@NoArgsConstructor
public class TRole {
private Integer id;
private String name;
private Integer age;
}
/**
*Excel工具类
*/
public class ExcelUtil {
public static final String FILE_NAME = "用户表";
public static final String EXCEL_XLS = "xls";
public static final String EXCEL_XLSX = "xlsx";
public static boolean isExcelXls(String filePath) {
return filePath.matches("^.+\\.(?i)(xls)$");
}
public static boolean isExcelXlsx(String filePath) {
return filePath.matches("^.+\\.(?i)(xlsx)$");
}
/ **
* Some cell is Numeric format with index E. Therefore, if you want to get that type String, the need for format conversion.
*
* @Param Cell
* @return
* /
public static String getStringFromNumericCell (the Cell Cell) {
return new new DecimalFormat ( "#" ) .format (cell.getNumericCellValue ());
}
/ **
* title generated by the object and sheet objects WorkBook
*
* @param WB WorkBook objects
* @param Sheet Sheet Object
* /
public static void createTitle (WB the Workbook, Sheet Sheet) {
//Generating a table header row );
= Sheet.createRow Row Row (0 );
// set the column width
sheet.setColumnWidth (. 1, 12 is 256 * );
sheet.setColumnWidth ( . 3, 256 *. 17 );
// set style: font bold, centering
CellStyle cellStyle = wb.createCellStyle ();
cellStyle.setAlignment (HorizontalAlignment.CENTER);
the font font = wb.createFont ();
font.setBold ( to true );
cellStyle.setFont (font);
// The object properties set the cell header
cell cell0 = row.createCell (0 );
cell0.setCellValue ( "ID"
cell0.setCellStyle(cellStyle);
Cell cell1 = row.createCell(1);
cell1.setCellValue("name");
cell1.setCellStyle(cellStyle);
Cell cell2 = row.createCell(2);
cell2.setCellValue("age");
cell2.setCellStyle(cellStyle);
}
/**
* 生成文件在本地
* @param fileName
* @param wb
*/
public static void buildExcelFile(String fileName, Workbook wb) {
try {
FileOutputStream fos = new FileOutputStream(fileName);
wb.write(fos);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 返回给浏览器
* @param fileName
* @param wb
* @param response
*/
public static void buildExcelFile(String fileName, Workbook wb, HttpServletResponse response) {
try {
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
ServletOutputStream outputStream = response.getOutputStream();
wb.write(outputStream);
outputStream.flush();
outputStream.close();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace ();
}
}
}
/**
*Controller层操作，省略service和dao
*/
@Controller
@RequestMapping("/excel")
public class ExcelController {
@Autowired
ExcelService excelService;
@RequestMapping("/")
public String toIndex() {
return "excel";
}
@ResponseBody
@RequestMapping("/download/{way}")
public String excelFileDownload(@PathVariable String way, HttpServletResponse response) throws IOException {
Workbook wb = null;
String filename = ExcelUtil.FILE_NAME;
if (ExcelUtil.EXCEL_XLS.equals(way)) {
wb = new HSSFWorkbook();
filename += ".xls";
} else if ((ExcelUtil.EXCEL_XLSX.equals(way))) {
wb = new XSSFWorkbook();
filename += ".xlsx";
}
Sheet sheet = wb.createSheet("角色表");
ExcelUtil.createTitle(wb, sheet);
//从数据库查出数据
List<TRole> tRoles = excelService.getAllRoles();
//记录新增行数据
int rowNum = 1;
for (TRole tRole : tRoles) {
Row row = sheet.createRow(rowNum);
row.createCell(0).setCellValue(tRole.getId());
row.createCell(1).setCellValue(tRole.getName());
row.createCell(2).setCellValue(tRole.getAge());
rowNum++;
}
//生成excel文件(在当前文件夹下)
//ExcelUtil.buildExcelFile(filename, wb);
//浏览器下载excel
ExcelUtil.buildExcelFile(filename, wb, response);
wb.close();
return "File downloaded successfully";
}
@ResponseBody
@RequestMapping("/upload")
public String excelFileUpload(MultipartFile file) throws IOException {
Workbook wb = null;
List<TRole> tRoleList = new ArrayList<>();
if (!ExcelUtil.isExcelXlsx(file.getOriginalFilename()) && !ExcelUtil.isExcelXls(file.getOriginalFilename())) {
return "The file must be of excel type";
}
IF (. file.getOriginalFilename () == null || file.getOriginalFilename () the equals ( "") || file.getSize () == 0) {
return "of The File CAN BE Not empty";
}
the try {
IF (ExcelUtil .isExcelXlsx (file.getOriginalFilename ())) {
WB = new new XSSFWorkbook (file.getInputStream ());
} the else {
WB = new new HSSFWorkbook (file.getInputStream ());
}
// Get the first table (the default is set it into a table)
sheet sheet wb.getSheetAt = (0);
// get the number of rows
int rowsNum sheet.getPhysicalNumberOfRows = ();
// through the rows
for (int I = 0; I <rowsNum; I ++) {
// header row is omitted
IF (I == 0) {
Continue;
}
Row Row = sheet.getRow (I);
// traversing each row of cells
// for (int J = 0; J <row.getPhysicalNumberOfCells (); J ++) {
/ / = row.getCell the cell cell (J);
//}
// here we specifically direct the operation of the cell
. Integer id = Integer.valueOf (Double.valueOf ( row.getCell (0) .getNumericCellValue ()) intValue () );
String name = row.getCell (. 1) .getStringCellValue ();
Integer = Integer.valueOf Age (Double.valueOf (row.getCell (2) .getNumericCellValue ()) intValue ());.
tRole tRole new new tRole = ( id, name, age);
tRoleList.add(tRole);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
wb.close();
}
return JSON.toJSONString(tRoleList);
}
}