Question

我正在尝试编写一个功能，我称之为REST端点，这使我得到了content-type: application/pdf的休息响应，看起来像这样：

%PDF-1.4 %�� 4304 0 obj

4330 0 obj <</C 1636/Filter/FlateDecode/I 1658/Length 1188/S 1431/T 1552>>stream h�bb��؀��cP�a\h�b�q��K��f��X��%�s<�o�� ��u.{��b�'�6��&��:�mV�ꛒ��妴�قU�"��I�\T�.��l��

当我试图获得这个身体的类时，它告诉我它是一个字符串。

这就是我的控制器的样子......

def download(){

     try{

    def documentContent = //rest response//

  if(documentContents){
    String body = documentContents.body
    byte[] data = body.getBytes("UTF-8")

    response.setContentType("application/pdf")
    response.setContentLength(data.length)
    response.setCharacterEncoding("UTF-8")
    response.setHeader("Content-disposition","attachment;filename=test.pdf")

     response.outputStream << data
     response.outputStream.flush()
     response.outputStream.close()
     return
    }
  }

catch(Exception e){

   println("abc")
  }

render status: 204

从我的控制器中，我得到一个包含这些页面的pdf文件，但它都是空白的。

Answer 1

我现在没有看到任何重大差异，但这对我有用......

def generatePdf(){
    ByteArrayOutputStream docStream = /*call that generates pdf data*/
    response.setHeader(HttpHeaders.CONTENT_DISPOSITION, 'inline; filename=print.pdf')
    response.setContentType('applicaton/pdf')
    response.contentLength = docStream.size()
    response.outputStream << docStream.toByteArray()
}

明确说明为什么会这样：注意缺少response.setCharacterEncoding（）。如果响应是某种明文风格，那么使用response.setCharacterEncoding（）是合适的。在您的情况下，响应是PDF，二进制文件，而不是文本。

Answer 2

这是调整后的代码..但我仍然得到相同的结果。

def generatePDF(){

 String body = documentContents.responseEntity.body
 ByteArrayOutputStream docStream = new ByteArrayOutputStream() 
 docStream.write(body.bytes) /* Write bytes into byte array*/
 response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=test.pdf")
 response.setContentType("application/pdf")
 response.setCharacterEncoding("UTF-8")
 response.contentLength = docStream.size()
 response.outputStream << docStream.toByteArray()
 response.outputStream.flush()
 response.outputStream.close()
}

Answer 3

您也可以使用

// assuming you have already retrieved the file 
// you can also use new File(path) instead of data
render(file: data, fileName: "fileName.pdf", contentType: "application/pdf")

仅供参考：这适用于Grails 3.x.它没有使用旧版本进行测试。

Answer 4

使用提供PDF文件字节流的REST服务，您可以基于输入流接收数据，因此可以利用强大的Apache IOUtils库。参见下面的控制器代码（在GRAILS3上测试）：

 public String get_CellData(int rownum, int colnum) throws Exception {
            try {
                cell = sheet.getRow(rownum).getCell(colnum);
                String CellData = null;
                switch (cell.getCellType()) {
                    case Cell.CELL_TYPE_STRING:
                        System.out.println("The type of cell is STRING ");
                        CellData = cell.getStringCellValue();
                        break;
                    case Cell.CELL_TYPE_NUMERIC:
                        System.out.println("The type of cell is NUMERIC ");
                        if (DateUtil.isCellDateFormatted(cell)) {
                            //CellData = cell.getDateCellValue().toString();
                            SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
                            CellData = sdf.format(cell.getDateCellValue());
                        } else {
                            String typeCell = cell.getCellStyle().getDataFormatString();
                            System.out.println("typeCell: " + typeCell);
                            if (typeCell.contains("%")) {
                                // DecimalFormat df5 = new DecimalFormat( "#,###,###,##0.00000");
                                DecimalFormat df5 = new DecimalFormat("#######.##0.00000");
                                Double value = cell.getNumericCellValue() * 100;
                                CellData = df5.format(value) + "%";
                                System.out.println("Percent value found = " + CellData.toString());
                            } else {
                                DataFormatter formatter = new DataFormatter();//("#,##0.00");
                                int formatIndex = cell.getCellStyle().getDataFormat();
                                String cellFormattedData = formatter.formatRawCellContents(cell.getNumericCellValue(), formatIndex, "#0.00");
                                //String cellFormattedData =  formatter.formatRawCellContents(cell.getNumericCellValue(), formatIndex, "###.##");
                                CellData = cellFormattedData;
                            }
                        }
                        break;
                    case Cell.CELL_TYPE_BLANK:
                        System.out.println("The type of cell is BLANK ");
                        CellData = "";
                        break;
                    case Cell.CELL_TYPE_BOOLEAN:
                        System.out.println("The type of cell is BOOLEAN ");
                        CellData = Boolean.toString(cell.getBooleanCellValue());
                        break;
                    case Cell.CELL_TYPE_FORMULA:
                        System.out.println("The type of cell is FORMULA ");
                        System.out.println("Formula is " + cell.getCellFormula());
                        switch (cell.getCachedFormulaResultType()) {
                            case Cell.CELL_TYPE_NUMERIC:
                                System.out.println("Last evaluated as: " + cell.getNumericCellValue());
                                DataFormatter formatter = new DataFormatter();//("#,##0.00");
                                int formatIndex = cell.getCellStyle().getDataFormat();
                                String cellFormattedData = formatter.formatRawCellContents(cell.getNumericCellValue(), formatIndex, "#,##0.00");
                                CellData = cellFormattedData;
                                break;
                            case Cell.CELL_TYPE_STRING:
                                System.out.println("Last evaluated as \"" + cell.getRichStringCellValue() + "\"");
                                CellData = cell.getStringCellValue();
                                break;
                        }

                }
                return CellData;
            } catch (Exception e) {
                return "";
            }
        }

Grails从REST webservice端点下载pdf文件

4 个答案: