springboot導出excel

使用easypoi快速導出excel

新建springboot工程

pom

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
   <groupId>org.jeecg</groupId>
   <artifactId>easypoi-base</artifactId>
   <version>2.4.0</version>
</dependency>

新建model

@Entity
@Table
@ExcelTarget(value = "user")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long uid;
    @Excel(name = "學生帳號", orderNum = "1", width = 25,height = 15)
    private String username;
    @Excel(name = "年齡", orderNum = "2", width = 25,height = 15)
    private int age;

    public long getUid() {
        return uid;
    }

    public void setUid(long uid) {
        this.uid = uid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

repository

@Repository
public interface Userrepository extends JpaRepository<User, Long> {
}

controller

@Controller
public class UserController {
    @Autowired
    Userrepository userrepository;

    @GetMapping(value = "/export")
    public void export(HttpServletResponse response) throws IOException {
        StringBuffer sb = new StringBuffer();
        String excelname = new String(sb.append("用戶統計").toString().getBytes("gbk"), "iso8859-1");
        response.setHeader("content-Type", "application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "attachment;filename=" + excelname + ".xls");
        OutputStream os = null;
        List<User> userList = userrepository.findAll();
        try {
            Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), User.class, userList);
            //設置樣式
            Sheet sheet = workbook.getSheet("Sheet0");//默認sheet的名字
            Row row = sheet.getRow(0); //取XSL文件Sheet1頁上第1行
            CellStyle cellStyle = workbook.createCellStyle();
            Font font = workbook.createFont();
            font.setFontHeightInPoints((short)18); //字體大小
            font.setFontName("楷體");
            font.setBold(true);
            font.setColor(HSSFColor.RED.index);    //紅色字
            cellStyle.setFont(font);
            cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            cellStyle.setAlignment(HorizontalAlignment.CENTER);
            int cells = row.getPhysicalNumberOfCells();
            for (int i=0;i<cells ;i++){
                row.getCell(i).setCellStyle(cellStyle);
            }
            os = new BufferedOutputStream(response.getOutputStream());
            workbook.write(os);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            os.flush();
            os.close();
        }
    }
}