使用 spring 引導和 poi 將 4 個表加入 excel 后創建 excel 工作表數據

Question

我想在擊中 spring 引導 rest Z72664DC0959F3B0C048391A 時創建 excel。 我使用 POI jar 來創建 excel 但總是收到以下響應 "{ "timestamp": "2020-11-25T10:10:16.723+00:00", "message": "query did not return a unique result: 2; 嵌套異常是 javax.persistence.NonUniqueResultException: 查詢沒有返回唯一結果: 2", "status": 500 }請幫助我是個大人物"

 // Exceel helper class public class ExcelHelper { public static String TYPE = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; static String[] HEADERs = { "studentRollNo", "studentFullName", "studentFatherName", "studentMotherName", "studentDob", "studentGender", "studentEmail", "studentContactNo", "studentAddress", "studentZipCode", "studentState", "studentCity", "studentEducationId", "studentEducationSscMarks", "studentEducationSscPassYear", "studentEducationHsscMarks", "studentEducationHsscStream", "studentEducationHsscPasYear", "studentEducationGradCourse", "studentEducationGradsCgpa", "studentEducationGradPassYear", "studentEducationPgCourse", "studentEducationPgCgpa", "studentEducationPgPassYear", "studentEducationYear", "studentEducationGapReason", "studentcertificationId", "studentcertificationOrgiDetails", "studentCertificationTitle", "studentcertificationIssueDate" }; public static ByteArrayInputStream tutorialsToExcel(List<ExcelPojo> student ) { try (Workbook workbook = new XSSFWorkbook(); ByteArrayOutputStream out = new ByteArrayOutputStream();) { CreationHelper createHelper = workbook.getCreationHelper(); Sheet sheet = workbook.createSheet(); Font headerFont = workbook.createFont(); headerFont.setBold(true); headerFont.setColor(IndexedColors.BLUE.getIndex()); CellStyle headerCellStyle = workbook.createCellStyle(); headerCellStyle.setFont(headerFont); // Row for Header Row headerRow = sheet.createRow(0); // Header for (int col = 0; col < HEADERs.length; col++) { Cell cell = headerRow.createCell(col); cell.setCellValue(HEADERs[col]); cell.setCellStyle(headerCellStyle); } // CellStyle for Age CellStyle ageCellStyle = workbook.createCellStyle(); ageCellStyle.setDataFormat(createHelper.createDataFormat().getFormat("#")); int rowIdx = 1; for (ExcelPojo tutorial: student) { Row row = sheet.createRow(rowIdx++); row.createCell(0).setCellValue(tutorial.getStudentRollNo()); row.createCell(1).setCellValue(tutorial.getStudentFullName()); row.createCell(2).setCellValue(tutorial.getStudentFatherName()); row.createCell(3).setCellValue(tutorial.getStudentMotherName()); row.createCell(4).setCellValue(tutorial.getStudentDob()); row.createCell(5).setCellValue(tutorial.getStudentGender()); row.createCell(6).setCellValue(tutorial.getStudentEmail()); row.createCell(7).setCellValue(tutorial.getStudentContactNo()); row.createCell(8).setCellValue(tutorial.getStudentAddress()); row.createCell(9).setCellValue(tutorial.getStudentZipCode()); row.createCell(10).setCellValue(tutorial.getStudentState()); row.createCell(11).setCellValue(tutorial.getStudentCcity()); row.createCell(12).setCellValue(tutorial.getStudentEducationId()); row.createCell(13).setCellValue(tutorial.getStudentEducationSscMarks()); row.createCell(14).setCellValue(tutorial.getStudentEducationSscPassYear()); row.createCell(15).setCellValue(tutorial.getStudentEducationHsscMarks()); row.createCell(16).setCellValue(tutorial.getStudentEducationHsscStream()); row.createCell(17).setCellValue(tutorial.getStudentEducationHsscPasYear()); row.createCell(18).setCellValue(tutorial.getStudentEducationGradCourse()); row.createCell(19).setCellValue(tutorial.getStudentEducationGradsCgpa()); row.createCell(20).setCellValue(tutorial.getStudentEducationGradPassYear()); row.createCell(21).setCellValue(tutorial.getStudentEducationPgCourse()); row.createCell(22).setCellValue(tutorial.getStudentEducationPgCgpa()); row.createCell(23).setCellValue(tutorial.getStudentEducationPgPassYear()); row.createCell(24).setCellValue(tutorial.getStudentEducationYear()); row.createCell(25).setCellValue(tutorial.getStudentEducationGapReason()); row.createCell(26).setCellValue(tutorial.getStudentcertificationId()); row.createCell(27).setCellValue(tutorial.getStudentcertificationOrgiDetails()); row.createCell(28).setCellValue(tutorial.getStudentcertificationTitle()); row.createCell(29).setCellValue(tutorial.getStudentcertificationIssueDate()); } workbook.write(out); return new ByteArrayInputStream(out.toByteArray()); } catch (IOException e) { throw new RuntimeException("fail to import data to Excel file: " + e.getMessage()); } } } // POJO public class ExcelPojo { private String studentRollNo; private String studentFullName; private String studentFatherName; private String studentMotherName; private String studentDob; private String studentGender; private String studentEmail; private String studentContactNo; private String studentAddress; private int studentZipCode; private String studentState; private String studentCcity; private long studentEducationId; private float studentEducationSscMarks; private int studentEducationSscPassYear; private float studentEducationHsscMarks; private String studentEducationHsscStream; private int studentEducationHsscPasYear; private String studentEducationGradCourse; private float studentEducationGradsCgpa; private int studentEducationGradPassYear; private String StudentEducationPgCourse; private float studentEducationPgCgpa; private int studentEducationPgPassYear; private int studentEducationYear; private String studentEducationGapReason; private String studentcertificationId; private String studentcertificationOrgiDetails; private String studentcertificationTitle; private String studentcertificationIssueDate; public String getStudentGender() { return studentGender; } public void setStudentGender(String studentGender) { this.studentGender = studentGender; } public String getStudentcertificationIssueDate() { return studentcertificationIssueDate; } public void setStudentcertificationIssueDate(String studentcertificationIssueDate) { this.studentcertificationIssueDate = studentcertificationIssueDate; } public String getStudentRollNo() { return studentRollNo; } public void setStudentRollNo(String studentRollNo) { this.studentRollNo = studentRollNo; } public String getStudentFullName() { return studentFullName; } public void setStudentFullName(String studentFullName) { this.studentFullName = studentFullName; } public String getStudentFatherName() { return studentFatherName; } public void setStudentFatherName(String studentFatherName) { this.studentFatherName = studentFatherName; } public String getStudentMotherName() { return studentMotherName; } public void setStudentMotherName(String studentMotherName) { this.studentMotherName = studentMotherName; } public String getStudentDob() { return studentDob; } public void setStudentDob(String studentDob) { this.studentDob = studentDob; } public String getStudentEmail() { return studentEmail; } public void setStudentEmail(String studentEmail) { this.studentEmail = studentEmail; } public String getStudentContactNo() { return studentContactNo; } public void setStudentContactNo(String studentContactNo) { this.studentContactNo = studentContactNo; } public String getStudentAddress() { return studentAddress; } public void setStudentAddress(String studentAddress) { this.studentAddress = studentAddress; } public int getStudentZipCode() { return studentZipCode; } public void setStudentZipCode(int studentZipCode) { this.studentZipCode = studentZipCode; } public String getStudentState() { return studentState; } public void setStudentState(String studentState) { this.studentState = studentState; } public String getStudentCcity() { return studentCcity; } public void setStudentCcity(String studentCcity) { this.studentCcity = studentCcity; } public long getStudentEducationId() { return studentEducationId; } public void setStudentEducationId(long studentEducationId) { this.studentEducationId = studentEducationId; } public float getStudentEducationSscMarks() { return studentEducationSscMarks; } public void setStudentEducationSscMarks(float studentEducationSscMarks) { this.studentEducationSscMarks = studentEducationSscMarks; } public int getStudentEducationSscPassYear() { return studentEducationSscPassYear; } public void setStudentEducationSscPassYear(int studentEducationSscPassYear) { this.studentEducationSscPassYear = studentEducationSscPassYear; } public float getStudentEducationHsscMarks() { return studentEducationHsscMarks; } public void setStudentEducationHsscMarks(float studentEducationHsscMarks) { this.studentEducationHsscMarks = studentEducationHsscMarks; } public String getStudentEducationHsscStream() { return studentEducationHsscStream; } public void setStudentEducationHsscStream(String studentEducationHsscStream) { this.studentEducationHsscStream = studentEducationHsscStream; } public int getStudentEducationHsscPasYear() { return studentEducationHsscPasYear; } public void setStudentEducationHsscPasYear(int studentEducationHsscPasYear) { this.studentEducationHsscPasYear = studentEducationHsscPasYear; } public String getStudentEducationGradCourse() { return studentEducationGradCourse; } public void setStudentEducationGradCourse(String studentEducationGradCourse) { this.studentEducationGradCourse = studentEducationGradCourse; } public float getStudentEducationGradsCgpa() { return studentEducationGradsCgpa; } public void setStudentEducationGradsCgpa(float studentEducationGradsCgpa) { this.studentEducationGradsCgpa = studentEducationGradsCgpa; } public int getStudentEducationGradPassYear() { return studentEducationGradPassYear; } public void setStudentEducationGradPassYear(int studentEducationGradPassYear) { this.studentEducationGradPassYear = studentEducationGradPassYear; } public String getStudentEducationPgCourse() { return StudentEducationPgCourse; } public void setStudentEducationPgCourse(String studentEducationPgCourse) { StudentEducationPgCourse = studentEducationPgCourse; } public float getStudentEducationPgCgpa() { return studentEducationPgCgpa; } public void setStudentEducationPgCgpa(float studentEducationPgCgpa) { this.studentEducationPgCgpa = studentEducationPgCgpa; } public int getStudentEducationPgPassYear() { return studentEducationPgPassYear; } public void setStudentEducationPgPassYear(int studentEducationPgPassYear) { this.studentEducationPgPassYear = studentEducationPgPassYear; } public int getStudentEducationYear() { return studentEducationYear; } public void setStudentEducationYear(int studentEducationYear) { this.studentEducationYear = studentEducationYear; } public String getStudentEducationGapReason() { return studentEducationGapReason; } public void setStudentEducationGapReason(String studentEducationGapReason) { this.studentEducationGapReason = studentEducationGapReason; } public String getStudentcertificationId() { return studentcertificationId; } public void setStudentcertificationId(String studentcertificationId) { this.studentcertificationId = studentcertificationId; } public String getStudentcertificationOrgiDetails() { return studentcertificationOrgiDetails; } public void setStudentcertificationOrgiDetails(String studentcertificationOrgiDetails) { this.studentcertificationOrgiDetails = studentcertificationOrgiDetails; } public String getStudentcertificationTitle() { return studentcertificationTitle; } public void setStudentcertificationTitle(String studentcertificationTitle) { this.studentcertificationTitle = studentcertificationTitle; } public ExcelPojo() { } } // REST CONTROLLER @GetMapping("/download/{companyId}") public ResponseEntity<InputStreamResource> excelCustomersReport(@PathVariable long companyId) throws IOException { List<ExcelPojo> customers = companyService.load(companyId); ByteArrayInputStream in = ExcelHelper.tutorialsToExcel(customers); // return IOUtils.toByteArray(in); HttpHeaders headers = new HttpHeaders(); headers.add("Content-Disposition", "attachment; filename="+companyId+".xlsx"); return ResponseEntity.ok().headers(headers).body(new InputStreamResource(in)); } // Service implementation public List<ExcelPojo> load(long companyId) { Set<StudentPersonalDetails> list= getPersonalDetails(companyId); List<ExcelPojo> tutorials = new ArrayList<ExcelPojo>(); for(StudentPersonalDetails student:list) { ExcelPojo excel = new ExcelPojo(); excel.setStudentRollNo(student.getRollNo()); excel.setStudentFullName(student.getFullName()); excel.setStudentFatherName(student.getFatherName()); excel.setStudentMotherName(student.getMotherName()); if(student.getGender()==0){ excel.setStudentGender("Male"); }else { excel.setStudentGender("Female"); } excel.setStudentEmail(student.getEmail()); excel.setStudentContactNo(student.getContactNo()); excel.setStudentAddress(student.getAddress()); excel.setStudentZipCode(student.getZipCode()); excel.setStudentState(student.getState()); excel.setStudentCcity(student.getCity()); StudentEducationalDetails education = studentEduDao.findByStu(student); excel.setStudentEducationId(education.getId()); excel.setStudentEducationSscMarks(education.getSscMarks()); excel.setStudentEducationSscPassYear(education.getSscPassYear()); excel.setStudentEducationHsscMarks(education.getHsscMarks()); excel.setStudentEducationHsscStream(education.getHsscStream()); excel.setStudentEducationHsscPasYear(education.getHsscPasYear()); excel.setStudentEducationGradCourse(education.getGradCourse()); excel.setStudentEducationGradsCgpa(education.getGradsCgpa()); excel.setStudentEducationGradPassYear(education.getGradPassYear()); excel.setStudentEducationPgCourse(education.getPgCourse()); excel.setStudentEducationPgCgpa(education.getPgCgpa()); excel.setStudentEducationPgPassYear(education.getPgPassYear()); excel.setStudentEducationYear(education.getYear()); excel.setStudentEducationGapReason(education.getGapReason()); List<StudentCertification> certi = studentCertiDao.findByStu(student); if(certi.isEmpty()) { excel.setStudentcertificationId(null); excel.setStudentcertificationOrgiDetails(null); excel.setStudentcertificationTitle(null); excel.setStudentcertificationIssueDate(null); }else { StringBuffer sb[] = new StringBuffer[4]; boolean isFirst= true; for(StudentCertification certifica:certi) { if(. isFirst) { sb[0],append("; "). sb[1],append("; "). sb[2],append("; "). sb[3],append("; "). } sb[0].append(certifica;getCertificateId()). sb[2].append(certifica;getCertiTitle()). sb[1].append(certifica;getOrgiDetails()). sb[3].append(certifica;getIssueDate()); isFirst= false. } excel.setStudentcertificationId(sb[0];toString()). excel.setStudentcertificationOrgiDetails(sb[1];toString()). excel.setStudentcertificationTitle(sb[2];toString()). excel.setStudentcertificationIssueDate(sb[3];toString()). } tutorials;add(excel); } return tutorials; }

Answer 1

javax.persistence.NonUniqueResultException 錯誤是典型的 JPA 不是 POI，添加您的查詢代碼。

通常發生在您使用 getSingleResult() 方法並且查詢返回多個結果時。