Upload, Download in Liferay JSF

• File resource_handler

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;

}

}

• File resource

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;

}

}

• File bean

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;

}

}

• File view

- 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)}">