How can I use Java application to add system files as an attachment to Couchdb database using Couchdb4J library?
I tried modifying the sample code below but there's an unresolved error. Does anybody know where's my mistake and how to fix it? Thanks in advance.
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import com.fourspaces.couchdb.CouchResponse;
import com.fourspaces.couchdb.Database;
import com.fourspaces.couchdb.Document;
import com.fourspaces.couchdb.Session;
public class FileScanner {
Session priceListDocsSession = new Session("localhost",5984);
Database db = priceListDocsSession.getDatabase("filesdb");
public static void main(String[] args) {
FileScanner fs = new FileScanner();
fs.processDir(new File("C:\\CouchDB"));
}
void processDir(File f) {
if (f.isFile()) {
Map<String, Object> doc = new HashMap<String, Object>();
doc.put("name", f.getName());
doc.put("path", f.getAbsolutePath());
doc.put("size", f.length());
db.saveDocument(doc);
InputStream is = new FileInputStream(f);
String att=db.putAttachment(doc.getId(),doc.getRev(),f,is);
}
else {
File[] fileList = f.listFiles();
if (fileList == null) return;
for (int i = 0; i < fileList.length; i++) {
try {
processDir(fileList[i]);
} catch (Exception e) {
System.out.println(e);
}
}
}
}
}
The errors appears on the db.saveDocument(doc);
and
String att=db.putAttachment(doc.getId(),doc.getRev(),f,is); saying that .getId() and getRev() is undefined for the type Map
I managed to fixed the problem by adding some of the jcouchdb dependencies on the classpath.
Related
I need to create a utility, which downloads the files from the box folder. But I am unable to get it working though:
package com.box.sdk.example;
import com.box.sdk.BoxConfig;
import com.box.sdk.BoxDeveloperEditionAPIConnection;
import com.box.sdk.BoxFile;
import com.box.sdk.BoxFolder;
import com.box.sdk.BoxItem;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class PlayGround {
public static void main(String[] args) {
Path configPath = Paths.get("config.json");
Path currentDir = Paths.get("").toAbsolutePath();
try (BufferedReader reader = Files.newBufferedReader(configPath, Charset.forName("UTF-8"))) {
BoxConfig boxConfig = BoxConfig.readFrom(reader);
BoxDeveloperEditionAPIConnection client = BoxDeveloperEditionAPIConnection.getAppEnterpriseConnection(boxConfig);
String folderId = "125601757844";
BoxFolder folder = new BoxFolder(client, folderId);
String folderName = folder.getInfo().getName();
Path localFolderPath = currentDir.resolve(Paths.get(folderName));
if (!Files.exists(localFolderPath)) {
localFolderPath = Files.createDirectory(localFolderPath);
} else {
localFolderPath = resetLocalFolder(localFolderPath);
}
for (BoxItem.Info itemInfo : folder) {
if (itemInfo instanceof BoxFile.Info) {
BoxFile.Info fileInfo = (BoxFile.Info) itemInfo;
BoxFile file = new BoxFile(client, fileInfo.getID());
String localFilePath = localFolderPath.resolve(Paths.get(fileInfo.getName())).toAbsolutePath()
.toString();
FileOutputStream stream = new FileOutputStream(localFilePath);
file.download(stream);
stream.close();
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
static Path resetLocalFolder(Path localFolderPath) throws IOException {
Files.list(localFolderPath).forEach(file -> {
System.out.println(file.getFileName());
try {
Files.delete(file.toAbsolutePath());
} catch (IOException e) {
}
});
Files.delete(localFolderPath);
localFolderPath = Files.createDirectory(localFolderPath);
return localFolderPath;
}
}
When I run this code, I get the following exception:
Exception in thread "main" com.box.sdk.BoxAPIResponseException: The API returned an error code [404 | lsgp4zgkfg6qipxg.0d094ed7daa5f78921603840e0fa470e1] not_found - Not Found
at com.box.sdk.BoxAPIResponse.<init>(BoxAPIResponse.java:92)
at com.box.sdk.BoxJSONResponse.<init>(BoxJSONResponse.java:32)
at com.box.sdk.BoxAPIRequest.trySend(BoxAPIRequest.java:680)
at com.box.sdk.BoxAPIRequest.send(BoxAPIRequest.java:382)
at com.box.sdk.BoxAPIRequest.send(BoxAPIRequest.java:349)
at com.box.sdk.BoxFolder.getInfo(BoxFolder.java:289)
at com.box.sdk.example.PlayGround.main(PlayGround.java:26)
Note: I am able to run the above code, by using developer token, which lasts for 1 hour, but I can't build my production application on such volatile code.
BoxAPIConnection client = new BoxAPIConnection("3i8b5sPnxUotd5etDuUkzGjXXzBphty9");
I am new to java, but not coding. I am trying to figure out java because it's part of my class this term and I am having a really hard problem grasping the idea of it and implementing things in java.
my problem Is that I am not sure if I am correctly using the arraylist to grab data from the scan of the file and input it into a arraylist to sort and print at a later time. I am just having issues picking up on java any help would be great since I am new to java.
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.ArrayList;
import java.util.*;
public class MissionCount
{
private static ArrayList<String> list = new ArrayList<String>();
// returns an InputStream that gets data from the named file
private static InputStream getFileInputStream(String fileName) throws Exception {
InputStream inputStream;
try {
inputStream = new FileInputStream(new File(fileName));
}
catch (FileNotFoundException e) { // no file with this name exists
inputStream = null;
throw new Exception("unable to open the file -- " + e.getMessage());
}
return inputStream;
}
public static void main(String[] args) {
if (args.length != 1) {
System.out.println("USage: MissionCount <datafile>");
//System.exit(1);
}
try {
System.out.printf("CS261 - MissionCount - Chad Dreher%n%n");
int crewcount = 0;
int misscount = 0;
InputStream log = getFileInputStream(args[0]);
Scanner sc = new Scanner(log);
sc.useDelimiter(Pattern.compile(",|\n"));
while (sc.hasNext()) {
String crewMember = sc.next();
list.add(crewMember);
String mission = sc.next();
list.add(mission);
}
sc.close();
// Add code to print the report here
}catch (Exception e) {
System.out.println("Error: " + e.getMessage());
}
}
}
InputStream log = getFileInputStream(args[0]);
Change that line to as follows :-
File log = new File(args[0])
that should work!
I want to add some code to the C source code, so I try to use ASTRewrite.
My Github project: cdt-rewrite
My code:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTIfStatement;
import org.eclipse.cdt.core.dom.ast.IASTStatement;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.gnu.c.GCCLanguage;
import org.eclipse.cdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.cdt.core.model.ILanguage;
import org.eclipse.cdt.core.parser.DefaultLogService;
import org.eclipse.cdt.core.parser.FileContent;
import org.eclipse.cdt.core.parser.IncludeFileContentProvider;
import org.eclipse.cdt.core.parser.ScannerInfo;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.ltk.core.refactoring.Change;
public class Main {
public static void main(String[] args) throws Exception {
IASTTranslationUnit u = getTranslationUnit(new File("D:/test.c"));
System.out.println(u.getRawSignature());
ASTRewrite rw = ASTRewrite.create(u);
u.accept(new ASTVisitor(true) {
#Override
public int visit(IASTStatement stm) {
if (stm instanceof IASTIfStatement){
rw.insertBefore(stm.getParent(), stm,
rw.createLiteralNode("callTo(1,2,3);"), null);
}
return PROCESS_CONTINUE;
}
});
Change c = rw.rewriteAST();
c.perform(new NullProgressMonitor());
//String changedSource = someHowGetCode(c);
}
static IASTTranslationUnit getTranslationUnit(File source) throws Exception{
FileContent reader = FileContent.create(
source.getAbsolutePath(),
getContentFile(source).toCharArray());
return GCCLanguage.getDefault().getASTTranslationUnit(
reader,
new ScannerInfo(),
IncludeFileContentProvider.getSavedFilesProvider(),
null,
ILanguage.OPTION_IS_SOURCE_UNIT,
new DefaultLogService());
}
static String getContentFile(File file) throws IOException {
StringBuilder content = new StringBuilder();
String line;
try (BufferedReader br = new BufferedReader(
new InputStreamReader(new FileInputStream(file)))) {
while ((line = br.readLine()) != null)
content.append(line).append('\n');
}
return content.toString();
}
}
But when I run this code, an exception is occur:
int test(int x){
if (x < 0)
return 0;
int i, s = 0;
for (i = 1; i < x; i++)
s = s + i;
return s;
}
Exception in thread "main" java.lang.NullPointerException
at org.eclipse.cdt.internal.formatter.ChangeFormatter.formatChangedCode(ChangeFormatter.java:92)
at org.eclipse.cdt.internal.core.dom.rewrite.changegenerator.ChangeGenerator.generateChange(ChangeGenerator.java:117)
at org.eclipse.cdt.internal.core.dom.rewrite.changegenerator.ChangeGenerator.generateChange(ChangeGenerator.java:104)
at org.eclipse.cdt.internal.core.dom.rewrite.ASTRewriteAnalyzer.rewriteAST(ASTRewriteAnalyzer.java:26)
at org.eclipse.cdt.core.dom.rewrite.ASTRewrite.rewriteAST(ASTRewrite.java:212)
at Main.main(Main.java:44)
Does anyone know how to solve this exception?
Thanks you
AFAIK This code is dependent on running in OSGi, but you appear to have made a Java project with a main. You need to a plug-in project with a MANIFEST.MF that references what you require.
You can create an Eclipse Application if you want to control the entry point to the program. If you want to graduate this rewriting code to be part of Eclipse/CDT, then different entry points such as an Eclipse Command tied to a menu/toolbar/key combination may be what you want.
I want to open, read, and edit file from my desktop. I am using Ideone online compiler. How do I read the file? I tried the following code:
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
class demo
{
public static void main(String[] args)
{
System.out.println("Hello World!");
File file = new File("C:/Users/psanghavi/Desktop/admin_confirmation_original.txt");
if (!file.exists())
{
System.out.println("does not exist.");
return;
}
if (!(file.isFile() && file.canRead()))
{
System.out.println(file.getName() + " cannot be read from.");
return;
}
try
{
FileInputStream fis = new FileInputStream(file);
char current;
while (fis.available() > 0)
{
current = (char) fis.read();
System.out.print(current);
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
My desktop has file named: admin_confirmation_original.txt
Currently, No. About the limit, Idebone FAQ say about this:
Can I write or read files in my program? - No
Can I access the network from my program? - No
You can learn more about many Ideone restricted rule at FAQ.
Ideoone doesn't support reading local files.
This is not an answer to your question, but wrt to the comments
if you want to read files hosted, you could access them using URL class.
import java.net.MalformedURLException;
import java.net.URL;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
class Demo {
public static void main(String[] args) throws IOException {
try {
final URL url = new URL("http://www.google.co.in/robots.txt");
//URL url = new URL("http://74.125.236.52/robots.txt");
BufferedReader in = new BufferedReader(
new InputStreamReader(url.openStream()));
String str;
while (in.readLine() != null) {
str = in.readLine();
System.out.println(str);
}
}
catch (MalformedURLException e) {
e.printStackTrace();
}
}
}
I have not tried it on file hosting sites.There are a lot of free file hostings available just google it.
I am trying to take the contents of an ArrayList and put them into an XML file. Does anyone have a quick,clean and easy solution to this rather that having to use streams and handle exceptions?
For more information, Here is the code I have currently I am getting problem with it, one of which its not creating the file.
package ie.wit.io;
import ie.wit.abs.Device;
import ie.wit.abs.Device;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JOptionPane;
public class FileHandler
{
private FileOutputStream outByteStream;
private ObjectOutputStream OOStream;
private FileInputStream inByteStream;
private ObjectInputStream OIStream;
private File aFile;
public void setUpFile()
{
aFile = new File("data.xml");
}
public boolean isFileEmpty()
{
return (aFile.length() <= 0);
}
public void writeToFile(ArrayList<Device> team)
{
try
{
outByteStream = new FileOutputStream(aFile);
OOStream = new ObjectOutputStream(outByteStream);
OOStream.writeObject(team);
outByteStream.close();
OOStream.close();
}
catch(IOException e)
{
JOptionPane.showMessageDialog(null,"I/O Error" + e + "\nPlease Contact your Administrator :-)");
}
}
currentClass)
public ArrayList<Device> readFromFile()
{
ArrayList<Device> temp = null;
try
{
inByteStream = new FileInputStream(aFile);
OIStream = new ObjectInputStream(inByteStream);
if(!this.isFileEmpty())
temp = (ArrayList<Device>)OIStream.readObject();
inByteStream.close();
OIStream.close();
}
catch(IOException e)
{
JOptionPane.showMessageDialog(null,"I/O Error" + e + "\nPlease Contact your Administrator :-)");
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null,"General Error" + e + "\nPlease Contact your Administrator :-)");
}
return temp;
}
}
There are many libraries to do that task.
Here is what I'm doing so far. Edit as per your requirement.
protected String getDocmentsAsString(List<News> documentsListByIndex) {
if(documentsListByIndex.size()>0){
try {
XStream xstream = new XStream(new JsonHierarchicalStreamDriver());
xstream.setMode(XStream.NO_REFERENCES);
xstream.alias("news", News.class);
return xstream.toXML(documentsListByIndex);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
Im using http://x-stream.github.io/json-tutorial.html
You can use a StringBuilder and generate the XML yourself.. It depends on how many items you want to convert. The fastest way is just pushing out the XML data using a StringBuilder.
I recommend to:
create a XSD
generate JAXB Java classes (e.g. using a Maven Plugin)
create instances of the JAXB Java classes and fill up the data
marshal the JAXB Java classes to XML