[英]Complex conditionals in JXLS-Reader loopbreakcondition
我需要一些使用 jxls-reader( http://jxls.sourceforge.net/reference/reader.html )的帮助。
我很喜欢循环一张纸,其中一行代表一个特定的 java 对象,但在嵌套循环的情况下,我很难过。
我需要将上面的 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
}
我的问题是定义 lookbreakcondition 来读取内部对象。 请注意, Class 对象的 loopbreakcondition 需要以下内容:
如何在 loopbreakcondition 中表达上述布尔条件。 我有以下内容,但我知道这是错误的:
<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>
这甚至可能吗? 有没有其他图书馆可以帮助我实现这一目标? 还是我最好使用 apache-poi 编写自己的解析器?
谢谢你。
您可以使用 apache-poi 来读取 excel(xls 或 xlsx(XSSF)) 文件。 有关更多信息,请参阅apache-poi 文档、 Apache POI-HSSF 与 POI-XSSF 。 在以下示例中将 Class 的类名更改为 StudentClass。 因为 class 是 java 中的关键字
尝试使用以下解决方案,
学生网.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
}
学生类
public class StudentClass {
private String name;
private String link;
//getters & setters
}
Excel文件阅读器
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);
}
}
}
}
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