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我有一個需求：我正在發送一個AJAX請求以將一些數據傳遞給服務器。在我的服務器中，我正在使用該數據創建一個文件。如何從Liferay serveResource（ - ， - ）方法中的AJAX請求下載文件
「現在問題是文件沒有下載到客戶端」。
（我使用Apache POI API從給定數據創建excel文件）。 任何人都可以幫助我做到這一點？
這裏是我的代碼：
（代碼以使AJAX請求）
<script>
function downloadUploadedBacklogs() {
try {
var table_data = [];
var count = jQuery("#backlogTable tr:first td").length;
jQuery("#<portlet:namespace/>noOfColumns").val(count);
var index = 0;
jQuery('tr').each(function(){
var row_data = '';
jQuery('td', this).each(function(){
row_data += jQuery(this).text() + '=';
});
table_data.push(row_data+";");
});
jQuery("#<portlet:namespace/>backlogDataForDownload").val(table_data);
jQuery("#<portlet:namespace/>cmd").val("downloadUploadedBacklogs");
alert('cmd: ' + jQuery("#<portlet:namespace/>cmd").val());
var formData = jQuery('#<portlet:namespace/>backlogImportForm').serialize();
jQuery.ajax({
url:'<%=resourceURL%>',
data:formData,
type: "post",
success: function(data) {
}
});
alert('form submitted');
} catch(e) {
alert('eroor: ' + e);
}
};
</script>
Java代碼的serveResource（ - ， - ）方法
/*
* serveResource(-, -) method to process the client request
*/
public void serveResource(ResourceRequest resourceRequest,
ResourceResponse resourceResponse) throws IOException,
PortletException {
String cmd = ParamUtil.getString(resourceRequest,"cmd");
System.out.println("**********************cmd*************"+cmd);
if(cmd!="") {
if("downloadUploadedBacklogs".equalsIgnoreCase(cmd)){
String backlogData = ParamUtil.getString(resourceRequest, "backlogDataForDownload");
ImportBulkDataUtil.downloadUploaded("Backlogs", resourceRequest,resourceResponse);
}
}
}
/ * ImportBulkDataUtil.downloadUploaded（ - ， - ， - ）方法創建Excel文件 /
public static void downloadUploaded(String schema, ResourceRequest resourceRequest,ResourceResponse resourceResponse) {
String excelSheetName = ParamUtil.getString(resourceRequest,"excelSheetName");
try {
resourceResponse.setContentType("application/vnd.ms-excel");
resourceResponse.addProperty(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename="+excelSheetName+"_Template.xls");
OutputStream outputStream=resourceResponse.getPortletOutputStream();
//converting the POI object as excel readble object
HSSFWorkbook objHSSFWorkbook=new HSSFWorkbook();
HSSFSheet objHSSFSheet=objHSSFWorkbook.createSheet(excelSheetName+"_Template");
//set the name of the workbook
Name name=objHSSFWorkbook.createName();
name.setNameName(excelSheetName+"_Template");
objHSSFSheet.autoSizeColumn((short)2);
// create freeze pane (locking) top row
objHSSFSheet.createFreezePane(0, 1);
// Setting column width
String excelData = StringPool.BLANK;
if((schema.equalsIgnoreCase("Backlogs"))){
System.out.println("Inside BacklogsCreation..........");
objHSSFSheet.setColumnWidth(0, 10000);
objHSSFSheet.setColumnWidth(1, 7000);
objHSSFSheet.setColumnWidth(2, 7000);
objHSSFSheet.setColumnWidth(3, 7000);
objHSSFSheet.setColumnWidth(4, 7000);
objHSSFSheet.setColumnWidth(5, 5000);
objHSSFSheet.setColumnWidth(6, 5000);
objHSSFSheet.setColumnWidth(7, 7000);
objHSSFSheet.setColumnWidth(8, 7000);
excelData = ParamUtil.getString(resourceRequest,"backlogDataForDownload");
}
System.out.println("downloadUploaded excelTableData: " + excelData);
// Header creation logic
HSSFRow objHSSFRowHeader = objHSSFSheet.createRow(0);
objHSSFRowHeader.setHeightInPoints((2*objHSSFSheet.getDefaultRowHeightInPoints()));
CellStyle objHssfCellStyleHeader = objHSSFWorkbook.createCellStyle();
objHssfCellStyleHeader.setFillBackgroundColor((short)135);
objHssfCellStyleHeader.setAlignment(objHssfCellStyleHeader.ALIGN_CENTER);
objHssfCellStyleHeader.setWrapText(true);
// Apply font styles to cell styles
HSSFFont objHssfFontHeader = objHSSFWorkbook.createFont();
objHssfFontHeader.setFontName("Arial");
objHssfFontHeader.setColor(HSSFColor.WHITE.index);
HSSFColor lightGrayHeader = setColor(objHSSFWorkbook,(byte) 0x00, (byte)0x20,(byte) 0x60);
objHssfCellStyleHeader.setFillForegroundColor(lightGrayHeader.getIndex());
objHssfCellStyleHeader.setFillPattern(CellStyle.SOLID_FOREGROUND);
objHssfFontHeader.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
objHssfFontHeader.setFontHeightInPoints((short)12);
objHssfCellStyleHeader.setFont(objHssfFontHeader);
objHssfCellStyleHeader.setWrapText(true);
// first column about Backlog title
HSSFCell objBacklogTitleCell = objHSSFRowHeader.createCell(0);
objBacklogTitleCell.setCellValue("Backlog");
objBacklogTitleCell.setCellStyle(objHssfCellStyleHeader);
// second column about Description
HSSFCell objBacklogDescCell = objHSSFRowHeader.createCell(1);
objBacklogDescCell.setCellValue("Description");
objBacklogDescCell.setCellStyle(objHssfCellStyleHeader);
// third column about Project
HSSFCell objProjectNameCell = objHSSFRowHeader.createCell(2);
objProjectNameCell.setCellValue("Project");
objProjectNameCell.setCellStyle(objHssfCellStyleHeader);
setComment("Project which the backlog belongs to", objProjectNameCell);
// fourth column about Category
HSSFCell objCategoryNameCell = objHSSFRowHeader.createCell(3);
objCategoryNameCell.setCellValue("Category");
objCategoryNameCell.setCellStyle(objHssfCellStyleHeader);
setComment("Category which the backlog belongs to (i.e. Bug, New Requirement, Enhancement)", objCategoryNameCell);
// fifth column about Group
HSSFCell objGroupNameCell = objHSSFRowHeader.createCell(4);
objGroupNameCell.setCellValue("Group");
objGroupNameCell.setCellStyle(objHssfCellStyleHeader);
setComment("Group which the backlog belongs to", objGroupNameCell);
// sixth column about Est. Start Date
HSSFCell objEstStartDtCell = objHSSFRowHeader.createCell(5);
objEstStartDtCell.setCellValue("Est. Start Date");
objEstStartDtCell.setCellStyle(objHssfCellStyleHeader);
setComment("Date Format: dd/mm/yyyy", objEstStartDtCell);
// seventh column about Est. End Date
HSSFCell objEstEndDtCell = objHSSFRowHeader.createCell(6);
objEstEndDtCell.setCellValue("Est. End Date");
objEstEndDtCell.setCellStyle(objHssfCellStyleHeader);
setComment("Date Format: dd/mm/yyyy", objEstEndDtCell);
// fifth column about Group
HSSFCell objStatusCell = objHSSFRowHeader.createCell(7);
objStatusCell.setCellValue("Status");
objStatusCell.setCellStyle(objHssfCellStyleHeader);
String excelTableDataRecords[] = excelData.split(";");
for(int i=1; i<excelTableDataRecords.length; i++) {
HSSFRow objHSSFRow = objHSSFSheet.createRow(i);
objHSSFRow.setHeightInPoints((2*objHSSFSheet.getDefaultRowHeightInPoints()));
excelTableDataRecords[i] = excelTableDataRecords[i].substring(0, (excelTableDataRecords[i].length()-2));
if(excelTableDataRecords[i].charAt(0) == ',') {
excelTableDataRecords[i] = excelTableDataRecords[i].substring(1, (excelTableDataRecords[i].length()));
}
String excelTableColumns[] = excelTableDataRecords[i].split("::");
for(int j=0; j<excelTableColumns.length; j++) {
// Apply font styles to cell styles
HSSFFont objHssfFont = objHSSFWorkbook.createFont();
objHssfFont.setFontName("Arial");
CellStyle objHssfCellStyle = objHSSFWorkbook.createCellStyle();
objHssfFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
objHssfFont.setColor(HSSFColor.BLACK.index);
objHssfFont.setFontHeightInPoints((short)10);
objHssfCellStyle.setWrapText(true);
objHssfCellStyle.setFont(objHssfFont);
// other column about Backlog title
HSSFCell objNewHSSFCellFirstNameAdd = objHSSFRow.createCell(j);
objNewHSSFCellFirstNameAdd.setCellValue(excelTableColumns[j]);
objNewHSSFCellFirstNameAdd.setCellStyle(objHssfCellStyle);
}
}
objHSSFWorkbook.write(outputStream);
} catch (IOException e) {
e.printStackTrace();
System.out.println("Exception raised in downloadUploaded() method to download uploaded excel data");
}
}
誰能幫助我？
PortletResponseUtil.sendFile(resourceRequest, resourceResponse, "FILENAME", byteStream.toByteArray(), "CONTENT_TYPE");
，而不是直接寫的：
** [請參見本：Java Servlet的下載文件示例]（http://www.codejava.net/java-ee/servlet/java-servlet-download-file-example）** – 2015-03-19 08:15:44
我也試過與resourceURL相同。但是，由於我的數據動態變化，所以我需要更新resourceURL參數值。但是，當我更新它比只有部分數據將發送到我的serveResource（ - ， - ）方法 – 2015-03-19 08:18:25
而我用resourceURL標識的另一個問題是具有一定長度限制的URL。所以當數據很龐大時會造成問題。 – 2015-03-19 08:22:08