title: Error Japanese character when export file csv java spring
body: <p>When export file csv, file excel, Japanese  character cannot be shown correctly. This my code:</p>
  
  <pre><code>public ResponseEntity&lt;byte[]&gt; searchStudentExportCsv(Page&lt;SearchStudentRes&gt; studentClasses) {
  HttpHeaders respHeader = new HttpHeaders();
  respHeader.set("Content-disposition", "attachment; filename=students.csv");
  StringWriter output = new StringWriter();
  String[] csvHeaders = {
    InternationalizationMessage.getString("csvfieldname.className"),
    InternationalizationMessage.getString("csvfieldname.startDate"),
    InternationalizationMessage.getString("csvfieldname.endDate"),
    InternationalizationMessage.getString("csvfieldname.startTime"),
    InternationalizationMessage.getString("csvfieldname.endTime"),
    InternationalizationMessage.getString("csvfieldname.grade"),
    InternationalizationMessage.getString("csvfieldname.place"),
    InternationalizationMessage.getString("csvfieldname.studentName")
  };
  try {
    CSVPrinter printer = new CSVPrinter(output, CSVFormat.DEFAULT.withHeader(csvHeaders));
    studentClasses.forEach(
        searchStudentRes -&gt; {
          try {
            printer.printRecord(
                searchStudentRes.getClassName(),
                searchStudentRes.getStartDate(),
                searchStudentRes.getEndDate(),
                searchStudentRes.getStartTime(),
                searchStudentRes.getEndTime(),
                searchStudentRes.getGrade(),
                searchStudentRes.getPlace(),
                searchStudentRes.getStudentName()
          } catch (IOException e) {
            log.error(e.getMessage(), e);
          }
        });
  } catch (IOException e) {
    log.error(e.getMessage(), e);
  }
  return new ResponseEntity(
      output.toString().getBytes(Charset.forName("UTF-8")), respHeader, HttpStatus.OK);
  </code></pre>
  
  <p>}</p>
  
  <p>And this is my Controller</p>
  
  <p>@PostMapping(value = "/exportCsv", produces = "application/octet-stream")
    public ResponseEntity searchStudentExportCsv(@Valid @RequestBody SearchStudentReq req) {
      return studentService.searchStudentExportCsv(req);
    }</p>
  
  <p>Please help me, Thanks You!</p>