java - 读取多个excel文件并将数据推送到java中的各个对象，寻找有效的方法

Question

我有多个Excel文件，使用apache poi库我可以读取每个Excel文件并将数据设置为对象。

例如，employee.xls:

emp.id   firstname  dob
111111   fName      19/10/2011
222222   tName      11/12/2010

对象如下:

 class Employee {
    private String empId;
    private String firstname;
    private Date dob;
    public String getEmpId() {
        return empId;
    }
    public void setEmpId(String empId) {
        this.empId = empId;
    }
    public String getFirstname() {
        return firstname;
    }
    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }
    public Date getDob() {
        return dob;
    }
    public void setDob(Date dob) {
        this.dob = dob;
    }
}

为了推送数据，我需要从 Excel 文件中读取数据并将其设置为 Employee 对象。如果我有超过 20 个不同的 xls 文件，那么我需要为每个 excel 文件编写代码来读取，然后将数据设置到各自的对象。还有其他有效的方法可以实现这一目标吗？

提前致谢!

Answer 1

假设结构始终相同，逻辑似乎相当简单:

1. 跳过第一行
2. 对于每一行
   • 创建对象的实例
   • 填充字段。

我会建议读者这样:

public class SheetReader<T> {
    private final Supplier<T> supplier; 
    private final List<BiConsumer<Cell, T>> populators;


    public SheetReader(Supplier<T> supplier, List<BiConsumer<Cell, T>> populators) {
        this.supplier = supplier;
        this.populators = populators;
    }


    public List<T> readSheet(final Sheet sheet, final boolean hasHeader) {
        final Iterator<Row> rows = sheet.iterator();
        if(hasHeader) {
            //skip first row
            rows.next();
        }
        final List<T> ts = new LinkedList<>();
        while(rows.hasNext()) {
            final Row row = rows.next();
            final T t = supplier.get();
            for(int i =0; i<populators.size();++i) {
                populators.get(i).accept(row.getCell(i), t);
            }
            ts.add(t);
        }
        return ts;
    }

}

使用地点:

//should be ArrayList due to random access. Could also be Guava ImmutableList
final List<BiConsumer<Cell, Employee>> populators = new ArrayList<>();
//add the populators in order
populators.add((c, e) -> e.setEmpId(c.getStringCellValue()));
populators.add((c, e) -> e.setFirstname(c.getStringCellValue()));
populators.add((c, e) -> e.setDob(c.getDateCellValue()));
//pass constructor as producer
final SheetReader<Employee> reader = new SheetReader<>(Employee::new, populators);
//can read many sheets of same type with same reader
final List<Employee> employees = reader.readSheet(sheet, true);