public class App3ResourceHandler extends ResourceHandlerWrapper {
public static final String LIBRARY_NAME_BCTHSD = "THSD";
public static final String FileDownload = "Download";
// Logger
private static final Logger logger = LoggerFactory
.getLogger(App3ResourceHandler.class);
// Private Data Members
private ResourceHandler wrappedResourceHandler;
public App3ResourceHandler(ResourceHandler wrappedResourceHandler) {
this.wrappedResourceHandler = wrappedResourceHandler;
}
@Override
public Resource createResource(String resourceName, String libraryName) {
if (libraryName.equals(LIBRARY_NAME_BCD)) {
if (BaoCaoDongExel.RESOURCE_NAME.equals(resourceName)) {
try {
BaoCaoDongBean baocaoSLTSTGBHBean = (BaoCaoDongBean) FacesContext
.getCurrentInstance().getExternalContext()
.getSessionMap().get("baocaodongbean");
Resource re = baocaoSLTSTGBHBean.getExport();
return re;
} catch (Exception e) { //
// TODO: handle exception return
wrappedResourceHandler.createResource(resourceName,
libraryName);
}
} else {
return wrappedResourceHandler.createResource(resourceName,
libraryName);
}
} else if (libraryName.equals(LIBRARY_NAME_BCTHSD)) {
if (BCTHSD_Export_Resource.RESOURCE_NAME.equals(resourceName)) {
try {
BaoCaoTinhHinhSuDungBean baocaoTHSDBean = (BaoCaoTinhHinhSuDungBean) FacesContext
.getCurrentInstance().getExternalContext()
.getSessionMap().get("baoCaoTinhHinhSuDungBean");
Resource re = baocaoTHSDBean.getExport();
return re;
} catch (Exception e) { //
// TODO: handle exception return
wrappedResourceHandler.createResource(resourceName,
libraryName);
}
} else {
return wrappedResourceHandler.createResource(resourceName,
libraryName);
}
}
return wrappedResourceHandler.createResource(resourceName, libraryName);
}
@Override
public void handleResourceRequest(FacesContext facesContext)
throws IOException {
ExternalContext externalContext = facesContext.getExternalContext();
String libraryName = externalContext.getRequestParameterMap().get("ln");
String resourceName = externalContext.getRequestParameterMap().get(
"javax.faces.resource");
String folderName = externalContext.getRequestParameterMap().get("BC1");
Resource resource = createResource(resourceName, libraryName);
ReadableByteChannel readableByteChannel = null;
WritableByteChannel writableByteChannel = null;
InputStream inputStream = null;
int bufferSize = 1024;
ByteBuffer byteBuffer = ByteBuffer.allocate(bufferSize);
try {
// Open an input stream in order to read the resource's
// contents/data.
if (libraryName.equalsIgnoreCase(FileDownload)) {
String path = FacesContext.getCurrentInstance()
.getExternalContext().getRealPath("");
if (folderName.equalsIgnoreCase("none")) {
path = path + File.separator + resourceName;
} else {
path = path + File.separator + folderName + File.separator
+ resourceName;
}
try {
File file = new File(path);
inputStream = new FileInputStream(file);
} catch (IOException e) {
// TODO: handle exception
System.out
.println("Rat tiec toi khong tim thay file ban can!");
}
} else {
inputStream = resource.getInputStream();
}
if (inputStream != null) {
// Set the response buffer size.
int responseBufferSize = byteBuffer.capacity();
externalContext.setResponseBufferSize(responseBufferSize);
String responseContentType = resource.getContentType();
externalContext.addResponseHeader("Content-Disposition",
"attachment; filename=" + resourceName);
if (responseContentType != null) {
externalContext.setResponseContentType(responseContentType);
}
// Copy the bytes in the resource's input stream to the
// response's output stream.
int responseContentLength = 0;
readableByteChannel = Channels.newChannel(inputStream);
writableByteChannel = Channels.newChannel(externalContext
.getResponseOutputStream());
int bytesRead = readableByteChannel.read(byteBuffer);
int bytesWritten = 0;
while (bytesRead != -1) {
byteBuffer.rewind();
byteBuffer.limit(bytesRead);
do {
bytesWritten += writableByteChannel.write(byteBuffer);
} while (bytesWritten < responseContentLength);
byteBuffer.clear();
responseContentLength += bytesRead;
bytesRead = readableByteChannel.read(byteBuffer);
if (logger.isTraceEnabled()) {
// Surround with isTraceEnabled check in order to avoid
// unnecessary conversion
// of int to String.
logger.trace("Handling - MORE bytesRead=[{0}]",
Integer.toString(bytesRead));
}
}
// Now that we know how big the file is, set the response
// content length.
externalContext.setResponseContentLength(responseContentLength);
externalContext.setResponseStatus(HttpServletResponse.SC_OK);
logger.debug(
"HANDLED (SC_OK) resourceName=[{0}], libraryName[{1}], responseContentType=[{2}], responseContentLength=[{3}]",
new Object[] { resourceName, libraryName,
responseContentType, responseContentLength });
}
} catch (IOException e) {
externalContext.setResponseStatus(HttpServletResponse.SC_NOT_FOUND);
logger.error(
"NOT HANDLED (SC_NOT_FOUND) resourceName=[{0}], libraryName[{1}], errorMessage=[{2}]",
new Object[] { resourceName, libraryName, e.getMessage() },
e);
} finally {
if (writableByteChannel != null) {
writableByteChannel.close();
}
if (readableByteChannel != null) {
readableByteChannel.close();
}
if (inputStream != null) {
inputStream.close();
}
}
}
@Override
public boolean libraryExists(String libraryName) {
if (LIBRARY_NAME.equals(libraryName)) {
return true;
} else {
return super.libraryExists(libraryName);
}
}
@Override
public ResourceHandler getWrapped() {
return wrappedResourceHandler;
}
}
public class BaoCaoDongExel extends Resource {
public static final String CONTENT_TYPE = "application/vnd.ms-excel";
public static final String RESOURCE_NAME = "BaoCao.xls";
private String requestPath;
public BaoCaoDongExel() {
setLibraryName(App3ResourceHandler.LIBRARY_NAME_BCD);
setResourceName(RESOURCE_NAME);
setContentType(CONTENT_TYPE);
if (!Validator.isNull(listData)) {
this.listData.clear();
}
}
@Override
public InputStream getInputStream() throws IOException {
byte[] excel = new byte[] {};
try {
// code tạo file xuất ra ở đây
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
wb.write(byteArrayOutputStream);
excel = byteArrayOutputStream.toByteArray();
} catch (Exception e2) {
System.out.println("co loi trong " + getClass().getName() + "\n"
+ e2);
}
return new ByteArrayInputStream(excel);
}
@Override
public String getRequestPath() {
if (requestPath == null) {
StringBuilder buf = new StringBuilder();
buf.append(ResourceHandler.RESOURCE_IDENTIFIER);
buf.append("/");
buf.append(getResourceName());
buf.append("?ln=");
buf.append(getLibraryName());
buf.append("&");
buf.append("BC1");// chua hieu
buf.append("=");
buf.append(Math.random());
requestPath = buf.toString();
}
return requestPath;
}
@Override
public Map getResponseHeaders() {
// TODO Auto-generated method stub
return null;
}
@Override
public URL getURL() {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean userAgentNeedsUpdate(FacesContext arg0) {
// TODO Auto-generated method stub
return false;
}
}
Lưu ý là
sessionscope
private BaoCaoDongExel export;
public BaoCaoDongExel getExport() {
export = new BaoCaoDongExel(các tham số truyền qua tương ứng);
return export;
}
public void setExport(BaoCaoDongExel export) {
this.export = export;
}
- Download Bean
@ManagedBean (name="downloadBean")
public class DownloadBean {
public String getLink(String folder, String fileName) {
String link1 = null;
if (link1 == null) {
StringBuilder buf = new StringBuilder();
buf.append(ResourceHandler.RESOURCE_IDENTIFIER);
buf.append("/");
buf.append(fileName);
buf.append("?ln=");
buf.append(App3ResourceHandler.FileDownload);
buf.append("&");
buf.append("BC1");
buf.append("=");
buf.append(folder);
link1 = buf.toString();
}
return link1;
}
}
- Nếu file đã có sẳn thì down theo đường dẫn nó.
style="display:#{tailieu.existFile=='TRUE'?'block':'none'}"
value="#{downloadBean.getLink(customUtils.GetFolderUpload(),tailieu.tenFileLuu)}">
