JXLS-Reader loopbreakcondition 中的復雜條件

Question

我需要一些使用 jxls-reader（ http://jxls.sourceforge.net/reference/reader.html ）的幫助。

我很喜歡循環一張紙，其中一行代表一個特定的 java 對象，但在嵌套循環的情況下，我很難過。

我需要將上面的 excel 表映射到以下 pojo：

class Student {
    private String name;
    private String dob;
    private List<Class> class;
    //getters & setters
}

class Class {
    private String name;
    private String link;
    //getters & setters
}

我的問題是定義 lookbreakcondition 來讀取內部對象。 請注意， Class 對象的 loopbreakcondition 需要以下內容：

• 下一行的第一個單元格為非空 OR
• 下一行的第一個單元格為空，當前列的下一個單元格為空（用於打破最后一行）

如何在 loopbreakcondition 中表達上述布爾條件。 我有以下內容，但我知道這是錯誤的：

<workbook>
    <worksheet name="Students">
        <section startRow="0" endRow="0">
            <!--Empty Header Section-->
        </section>
        <loop startRow="1" endRow="1" items="students" var="student" varType="com.test.Student">
            <section startRow="1" endRow="1">
                <mapping row="1" col="0">student.name</mapping>
                <mapping row="1" col="1">student.dob</mapping>
            </section>
            <loopbreakcondition>
                <rowcheck offset="0">
                    <cellcheck offset="0"> <!--Breaks on next empty cell--></cellcheck>
                </rowcheck>
            </loopbreakcondition>

            <loop startRow="1" endRow="1" items="student.class" var="class" varType="com.test.Class">
                <section startRow="1" endRow="1">
                    <mapping row="1" col="2">class.name</mapping>
                    <mapping row="1" col="3">class.link</mapping>
                </section>
                <loopbreakcondition>
                    <rowcheck offset="0">
                        <cellcheck offset="0"> </cellcheck>
                    </rowcheck>
                </loopbreakcondition>
            </loop>
        </loop>
    </worksheet>
</workbook>

這甚至可能嗎？ 有沒有其他圖書館可以幫助我實現這一目標？ 還是我最好使用 apache-poi 編寫自己的解析器？

謝謝你。

Answer 1

您可以使用 apache-poi 來讀取 excel(xls 或 xlsx(XSSF)) 文件。 有關更多信息，請參閱apache-poi 文檔、 Apache POI-HSSF 與 POI-XSSF 。 在以下示例中將 Class 的類名更改為 StudentClass。 因為 class 是 java 中的關鍵字

嘗試使用以下解決方案，

學生網.java

public class Student {
    private String name;
    private Date dob; //as per given excel file, dob is a date format
    private ArrayList<StudentClass> studentClassList;

    //getters & setters
}

學生類

public class StudentClass {
    private String name;
    private String link;

    //getters & setters
}

Excel文件閱讀器

public class ExcelFileReader() {
    private String studentName; //for store the previous student name
    private List<Student> listStudent; //for collect the students

    public void readData() {
        listStudent = new ArrayList<Student>();
        studentName = "";
        FileInputStream excelFile = new FileInputStream(new File(INPUT_EXCEL_FILE_NAME));
        Workbook workbook = new XSSFWorkbook(excelFile); //create the workbook using input excel file
        Sheet sheet = workbook.getSheetAt(0); //get the first sheet of excel file
        int rowCount = sheet.getPhysicalNumberOfRows(); //get the row count

        for(int i = 1; i < rowCount; i++) { //i initialized with 1 for exclude the first row(first row id is 0 and it hold the column names)
            if(rowCount>1){ //ignore the first row. because at this time no any student created
                listStudent.add(student); //add student into student list
                //you can use the created student in here as per your requirement
            }

            Row currentRow = sheet.getRow(i); //get current row
            if(!studentName.equals(currentRow.getCell(0).getStringCellValue())){ //if not equals current student name with previous student name then create new student entry
                Student student = new Student();
                student.setName(currentRow.getCell(0).getStringCellValue()); //first cell id is 0
                studnet.setDob(currentRow.getCell(1).getDateCellValue()); //second cell id is 1
                studentName = student.getName(); //assign the current student name to studentName variable for future validation

                if(!currentRow.getCell(2).getStringCellValue().equals(null) && !currentRow.getCell(2).getStringCellValue().equals("")){ //check the student has a class at same row(first row with new student entry)
                    StudentClass studentClass = new StudentClass();
                    studentClass.setName(currentRow.getCell(2).getStringCellValue()); //third cell id is 2
                    studentClass.setLink(currentRow.getCell(3).getStringCellValue());
                    student.getStudentClassList.add(studentClass); //add relevant StudnetClass into StudentClassList of Student. please initialized the StudentClassList in StudentClass
                }
            }else{ //this code block execute when student has more than one class
                StudentClass studentClass = new StudentClass();
                studentClass.setName(currentRow.getCell(2).getStringCellValue());
                studentClass.setLink(currentRow.getCell(3).getStringCellValue());
                student.getStudentClassList.add(studentClass);
            }
        }
    }
}