I have created assets folder inside resources. I want to display list of image names in the assets folder. By clicking image name, it should open the particular image. I can access the images separately but how to display all the images as file explorer.
You might use ResourcePatternResolver:
#Controller
#RequestMapping("/assets")
public class AssetController {
#Autowired
private ResourcePatternResolver resolver;
#GetMapping("")
#ResponseBody
public String resources() throws IOException {
final String root = resolver.getResource("classpath:/static/assets").getURI().toString();
final Resource[] resources = resolver
.getResources("classpath:/static/assets/**/*.png");
final List<String> fileNames = Stream.of(resources)
.filter(Resource::isFile)
.map(r -> {
try {
return r.getURI().toString().replace(root, "");
} catch (final IOException e) {
throw new IOError(e);
}
})
.collect(Collectors.toList());
final StringBuilder html = new StringBuilder();
html.append("<html>");
html.append("<ul>");
for (final String fileName : fileNames) {
html.append("<li>");
html.append("" + fileName + "");
html.append("</li>");
}
html.append("</ul>");
html.append("</html>");
return html.toString();
}
}
Related
I want to load the values from json file upon the Spring Boot Application is started.
My code for the Configuration File is like the below:
#Configuration
#Getter
public class FedexAPIConfig {
private final static String JSON_FILE = "/static/config/fedex-api-credentials.json";
private final boolean IS_PRODUCTION = false;
private FedexAPICred apiCredentials;
public FedexAPIConfig() {
try (InputStream in = getClass().getResourceAsStream(JSON_FILE);
BufferedReader reader = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8))) {
JSONObject json = new JSONObject();
// this.apiCredentials = new JSONObject(new JSONTokener(reader));
if (IS_PRODUCTION) {
json = new JSONObject(new JSONTokener(reader)).getJSONObject("production");
} else {
json = new JSONObject(new JSONTokener(reader)).getJSONObject("test");
}
System.out.println(json.toString());
this.apiCredentials = FedexAPICred.builder()
.url(json.optString("url"))
.apiKey(json.optString("api_key"))
.secretKey(json.optString("secret_key"))
.build();
} catch (FileNotFoundException fnfe) {
fnfe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
and with this, when the application is in progress of startup, values are successfully printed on the console.Startup console log
When I tried to call this value from other ordinary class, like the below:, it brings nothing but just throws NullPointerException... What are my faults and what shall I do?
public class FedexOAuthTokenManager extends OAuthToken {
private static final String VALIDATE_TOKEN_URL = "/oauth/token";
private static final String GRANT_TYPE_CLIENT = "client_credentials";
private static final String GRANT_TYPE_CSP = "csp_credentials";
#Autowired
private FedexAPIConfig fedexApiConfig;
#Autowired
private Token token;
#Override
public void validateToken() {
// This is the part where "fedexApiConfig" is null.
FedexAPICred fedexApiCred = fedexApiConfig.getApiCredentials();
Response response = null;
try {
RequestBody body = new FormBody.Builder()
.add("grant_type", GRANT_TYPE_CLIENT)
.add("client_id", fedexApiCred.getApiKey())
.add("client_secret", fedexApiCred.getSecretKey())
.build();
response = new HttpClient().post(fedexApiCred.getUrl() + VALIDATE_TOKEN_URL, body);
if (response.code() == 200) {
JSONObject json = new JSONObject(response.body().string());
token.setAccessToken(json.optString("access_token"));
token.setTokenType(json.optString("token_type"));
token.setExpiredIn(json.optInt("expires_in"));
token.setExpiredDateTime(LocalDateTime.now().plusSeconds(json.optInt("expires_in")));
token.setScope(json.optString("scope"));
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
fedexApiConfg is null even though I autowired it in prior to call.
And this FedexOAuthTokenManager is called from other #Component class by new FedexOAuthTokenManager()
Did you try like below?
Step 1: Create one Configuration class like below
public class DemoConfig implements ApplicationListener<ApplicationPreparedEvent> {
#Override
public void onApplicationEvent(ApplicationPreparedEvent event) {
//Load the values from the JSON file and populate the application
//properties dynamically
ConfigurableEnvironment environment = event.getApplicationContext().getEnvironment();
Properties props = new Properties();
props.put("spring.datasource.url", "<my value>");
//Add more properties
environment.getPropertySources().addFirst(new PropertiesPropertySource("myProps", props));
}
To listen to a context event, a bean should implement the ApplicationListener interface which has just one method onApplicationEvent().The ApplicationPreparedEvent is invoked very early in the lifecycle of the application
Step 2: Customize in src/main/resources/META-INF/spring.factories
org.springframework.context.ApplicationListener=com.example.demo.DemoConfig
Step 3: #Value in spring boot is commonly used to inject the configuration values into the spring boot application. Access the properties as per your wish.
#Value("${spring.datasource.url}")
private String valueFromJSon;
Try this sample first in your local machine and then modify your changes accordingly.
Refer - https://www.baeldung.com/spring-value-annotation
Refer - https://www.knowledgefactory.net/2021/02/aws-secret-manager-service-as.html
I want to upload file on remote server, currently i am only able to upload on local machine. below is my code
#PostMapping("/upload")
public UploadFileResponse uploadFile(#RequestParam("file") MultipartFile file) {
String fileName = fileStorageService.storeFile(file);
String fileDownloadUri = ServletUriComponentsBuilder.fromCurrentContextPath()
.path("/downloadFile/")
.path(fileName)
.toUriString();
return new UploadFileResponse(fileName, fileDownloadUri,file.getContentType(), file.getSize());
}
file.upload-dir=C:\\Test
Thanks in Advance!
EDIT:
1. Use case : You want to upload the file locally (i.e. where your application is running):
You create StorageService interface and an implementing class FileSystemStorageService:
#Service
public class FileSystemStorageService implements StorageService {
private final Path rootLocation;
#Autowired
public FileSystemStorageService(StorageProperties properties) {
this.rootLocation = Paths.get(properties.getLocation());
}
#Override
public void store(MultipartFile file) {
String filename = StringUtils.cleanPath(file.getOriginalFilename());
try {
if (file.isEmpty()) {
throw new StorageException("Failed to store empty file " + filename);
}
if (filename.contains("..")) {
// This is a security check
throw new StorageException(
"Cannot store file with relative path outside current directory "
+ filename);
}
try (InputStream inputStream = file.getInputStream()) {
Files.copy(inputStream, this.rootLocation.resolve(filename),
StandardCopyOption.REPLACE_EXISTING);
}
}
catch (IOException e) {
throw new StorageException("Failed to store file " + filename, e);
}
}
And the controller class:
#Controller
public class FileUploadController {
private final StorageService storageService;
#Autowired
public FileUploadController(StorageService storageService) {
this.storageService = storageService;
}
#PostMapping("/")
public String handleFileUpload(#RequestParam("file") MultipartFile file,
RedirectAttributes redirectAttributes) {
storageService.store(file);
redirectAttributes.addFlashAttribute("message",
"You successfully uploaded " + file.getOriginalFilename() + "!");
return "redirect:/";
}
You can find the whole sample under https://github.com/spring-guides/gs-uploading-files.
2. Use case : You want to upload the file to a remote server:
I recommend in this case to use SFTP.
You create a RemoteFileSystemStorageService implementing the StorageService (Already created in the first use case).
#Service
public class RemoteFileSystemStorageService implements StorageService {
#Autowired
private StorageProperties properties
final private ChannelSftp channelSftp;
#PostConstruct
public void setUpSsh(){
JSch jsch = new JSch();
Session jschSession = jsch.getSession(properties.getUsername(),
properties.getRemoteHost());
jschSession.setPassword(properties.getPassword());
jschSession.connect();
this.channelSftp = (ChannelSftp)jschSession.openChannel("sftp");
}
#Override
public void store(MultipartFile file) {
String filename = StringUtils.cleanPath(file.getOriginalFilename());
try {
if (file.isEmpty()) {
throw new StorageException("Failed to store empty file " + filename);
}
if (filename.contains("..")) {
// This is a security check
throw new StorageException(
"Cannot store file with relative path outside current directory "
+ filename);
}
try (InputStream inputStream = file.getInputStream()) {
this.channelSftp.connect();
this.channelSftp.put(inputStream, properties.getRemoteServerDirectory());
}
}
catch (IOException e) {
throw new StorageException("Failed to store file " + filename, e);
}
finally{
this.channelSftp.close();
}
}
I am newbee to Spring integration. i am trying to implement customer sftp filter to list the files in SFTP server. I am getting "The blank final field seen may not have been initialized" at the constructor.Can you please suggest me to get list of file names from sftp server.
I dont have any idea what went wrong in my code.
Thanks in Advance
java code
public class SFTPFileFilter extends SftpSimplePatternFileListFilter {
public SFTPFileFilter(String pattern) {
super(pattern);
// TODO Auto-generated constructor stub
}
final static Logger logger = LoggerFactory.getLogger(SFTPFileFilter.class);
private final Queue<File> seen;
private final Set<File> seenSet = new HashSet<File>();
private final Object monitor = new Object();
public static int fileCount = 0;
#Autowired
private SourcePollingChannelAdapter sftpInbondAdapter;
public List<File> filterFiles(File[] files)
{
List<File> accepted = new ArrayList<File>();
for (File file : files) {
System.out.println(file.getName());
accepted.add(file);
}
return accepted;
}
public boolean accept(File file) {
synchronized (this.monitor) {
if (this.seenSet.contains(file)) {
logger.info(file.getName()+" is already copied earlier");
return false;
}
if (this.seen != null) {
if (!this.seen.offer(file)) {
File removed = this.seen.poll();
this.seenSet.remove(removed);
this.seen.add(file);
}
}
this.seenSet.add(file);
return true;
}
}
}
private final Queue<File> seen;
You are not initializing that field in a constructor.
You can't extend it like that; simply override the method like this...
public List<File> filterFiles(File[] files) {
for (File file : files) {
System.out.println("received:" + file.getName());
}
List<File> filtered = super.filterFiles(files);
for (File file : flteredFiles) {
System.out.println("after filter:" + file.getName());
}
return filteredFiles;
}
I would like to get Coding To Upload Image(.jpg)/Photo to Server Machine using Struts1.x and
mySQL database I have the code for File Upload Instead.
Let me know what tweaking is required here. TC
Code for File Upload :----
public class FileUploadForm extends ActionForm{
private FormFile file;
public FormFile getFile() {
return file;
}
public void setFile(FormFile file) {
this.file = file;
}
#Override
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {
ActionErrors errors = new ActionErrors();
if( getFile().getFileSize()== 0){
errors.add("common.file.err",
new ActionMessage("error.common.file.required"));
return errors;
}
//only allow textfile to upload
if(!"text/plain".equals(getFile().getContentType())){
errors.add("common.file.err.ext",
new ActionMessage("error.common.file.textfile.only"));
return errors;
}
//file size cant larger than 10kb
System.out.println(getFile().getFileSize());
if(getFile().getFileSize() > 10240){ //10kb
errors.add("common.file.err.size",
new ActionMessage("error.common.file.size.limit", 10240));
return errors;
}
return errors;
}
}
Action Class:--
public class FileUploadAction extends Action{
#Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
FileUploadForm fileUploadForm = (FileUploadForm)form;
FormFile file = fileUploadForm.getFile();
//Get the servers upload directory real path name
String filePath =
getServlet().getServletContext().getRealPath("/") +"upload";
//create the upload folder if not exists
File folder = new File(filePath);
if(!folder.exists()){
folder.mkdir();
}
String fileName = file.getFileName();
if(!("").equals(fileName)){
System.out.println("Server path:" +filePath);
File newFile = new File(filePath, fileName);
if(!newFile.exists()){
FileOutputStream fos = new FileOutputStream(newFile);
fos.write(file.getFileData());
fos.flush();
fos.close();
}
request.setAttribute("uploadedFilePath",newFile.getAbsoluteFile());
request.setAttribute("uploadedFileName",newFile.getName());
}
return mapping.findForward("success");
}
}
Thanks in Advance!
I am pretty new to Wicket and i have some difficulties with using resource references. I am using wicket 1.5.4 and have following problem: I store images on the file system. I have class ImageElement which holds part of the file path relative to configured rootFilePath (i.e dir1/dir2/img1.png). On the page I add Image as follows:
new Image("id",ImagesResourceReference.get(), pageParameters)
where page parameters includes image path parameter (path="/dir1/dir2/img1.png"). My questions are:
Is it the simplest way of serving images from the file system?
Is it ok to use ResourceReference with static method? or I should construct each time new ResourceReference? I saw that in previous version it was possible to use new ResourceReference(globalId), but it seems not to be the case anymore. If so what is the global resource reference for? So far as I understand resource reference is supposed to be factory for resources so it would be rather strange to create new factory for each resource request.
The last question is, how can i pass the path to the image in a better way so that i do not have to concatenate indexed parameters to build the path once respond method is invoked on ImageResource.
What would be the best scenario to get it working in efficient and simple way, i saw the example in 'Wicket in action', but this is meant for dynamic image generation from db and am not sure if it suites for my case
My implementation of ResourceReference which I mounted in Application under "/images" path, looks as follows:
public class ImagesResourceReference extends ResourceReference {
private static String rootFileDirectory;
private static ImagesResourceReference instance;
private ImagesResourceReference() {
super(ImagesResourceReference.class, "imagesResourcesReference");
}
public static ImagesResourceReference get() {
if(instance == null) {
if(StringUtils.isNotBlank(rootFileDirectory)) {
instance = new ImagesResourceReference();
} else {
throw new IllegalStateException("Parameter configuring root directory " +
"where images are saved is not set");
}
}
return instance;
}
public static void setRootFileDirectory(String rootFileDirectory) {
ImagesResourceReference.rootFileDirectory = rootFileDirectory;
}
private static final long serialVersionUID = 1L;
#Override
public IResource getResource() {
return new ImageResource(rootFileDirectory);
}
private static class ImageResource implements IResource {
private static final long serialVersionUID = 1L;
private final String rootFileDirectory;
public ImageResource(String rootFileDirectory) {
this.rootFileDirectory = rootFileDirectory;
}
#Override
public void respond(Attributes attributes) {
PageParameters parameters = attributes.getParameters();
List<String> indexedParams = getAllIndexedParameters(parameters);
if(!indexedParams.isEmpty() && isValidImagePath(indexedParams)) {
String pathToRequestedImage = getImagePath(indexedParams);
FileResourceStream fileResourceStream = new FileResourceStream(new File(pathToRequestedImage));
ResourceStreamResource resource = new ResourceStreamResource(fileResourceStream);
resource.respond(attributes);
}
}
private boolean isValidImagePath(List<String> indexedParams) {
String fileName = indexedParams.get(indexedParams.size() -1);
return !FilenameUtils.getExtension(fileName).isEmpty();
}
private List<String> getAllIndexedParameters(PageParameters parameters) {
int indexedparamCount = parameters.getIndexedCount();
List<String> indexedParameters = new ArrayList<String>();
for(int i=0; i<indexedparamCount ;i++) {
indexedParameters.add(parameters.get(i).toString());
}
return indexedParameters;
}
private String getImagePath(List<String> indexedParams) {
return rootFileDirectory + File.separator + StringUtils.join(indexedParams, File.separator);
}
}
Any help and advices appreciated! Thanks in advance.
You could use it as a shared resource:
public class WicketApplication extends WebApplication {
#Override
public Class<HomePage> getHomePage() {
return HomePage.class;
}
#Override
public void init() {
super.init();
getSharedResources().add("downloads", new FolderContentResource(new File("C:\\Users\\ronald.tetsuo\\Downloads")));
mountResource("downloads", new SharedResourceReference("downloads"));
}
static class FolderContentResource implements IResource {
private final File rootFolder;
public FolderContentResource(File rootFolder) {
this.rootFolder = rootFolder;
}
public void respond(Attributes attributes) {
PageParameters parameters = attributes.getParameters();
String fileName = parameters.get(0).toString();
File file = new File(rootFolder, fileName);
FileResourceStream fileResourceStream = new FileResourceStream(file);
ResourceStreamResource resource = new ResourceStreamResource(fileResourceStream);
resource.respond(attributes);
}
}
}
You can still use ResourceReferences with global IDs. You just have to use a SharedResourceReference. This is probably better, too.
add(new Image("image", new SharedResourceReference("mySharedResourceRef", parameters));
I would try to avoid building paths from URL parameters. This can easily end up in security leaks.