import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException;
import org.apache.jackrabbit.JcrConstants; import org.apache.jackrabbit.oak.Oak; import org.apache.jackrabbit.oak.jcr.Jcr; import org.apache.jackrabbit.oak.plugins.document.DocumentMK; import org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore; import org.apache.jackrabbit.oak.spi.security.OpenSecurityProvider;
import com.mongodb.DB; import com.mongodb.MongoClient;
import javax.jcr.Binary; import javax.jcr.LoginException; import javax.jcr.Node; import javax.jcr.Repository; import javax.jcr.RepositoryException; import javax.jcr.Session; import javax.jcr.version.Version; import javax.jcr.version.VersionHistory; import javax.jcr.version.VersionIterator; import javax.jcr.version.VersionManager;
public class Versioning {
public static void main(String[] args) throws LoginException,
RepositoryException, FileNotFoundException {
// TODO Auto-generated method stub
DB db = new MongoClient("127.0.0.1", 27017).getDB("mydb");
DocumentNodeStore ns = new DocumentMK.Builder().setMongoDB(db)
.getNodeStore();
System.out.println("start");
Repository repo = new Jcr(new Oak(ns)).with(new OpenSecurityProvider())
.createRepository();
Session session = repo.login();
VersionManager vm = session.getWorkspace().getVersionManager();
Node parentNode = session.getRootNode();
String multiPartFileName = "pdf";
FileInputStream stream;
Binary binary;
Node node;
Node content;
Node fileNode;
if (parentNode.hasNode("pdfFileNode")) {
node = parentNode.getNode("pdfFileNode");
} else {
node = parentNode.addNode("pdfFileNode", "nt:unstructured");
}
if (node.hasNode(multiPartFileName)) {
fileNode = node.getNode(multiPartFileName);
System.out.println("filenode available");
} else {
fileNode = node.addNode(multiPartFileName, "nt:file");
System.out.println("creating the filenode");
}
stream = new FileInputStream(new File("D:/pdf-sample.pdf"));
if (fileNode.hasNode("jcr:content")) {
content = fileNode.getNode("jcr:content");
} else {
content = fileNode.addNode("jcr:content", "nt:resource");
}
System.out.println("crossed");
binary = session.getValueFactory().createBinary(stream);
node.addMixin(JcrConstants.MIX_VERSIONABLE);
content.setProperty("jcr:data", binary);
session.save();
System.out.println("node.getPath() :" + node.getPath());
Version firstVersion = vm.checkin(node.getPath());
System.out.println("firstVersion :" + firstVersion);
Node child = parentNode.getNode("pdfFileNode");
System.out.println("child.getPath() :" + child.getPath());
vm.checkout(child.getPath());
System.out.println("checkout child.getPath() :" + child.getPath());
stream = new FileInputStream(new File("D:/pdf-sample.pdf"));
//content = fileNode.addNode("jcr:content", "nt:resource");
binary = session.getValueFactory().createBinary(stream);
content.setProperty("jcr:data", binary);
session.save();
vm.checkin(child.getPath());
System.out.println("checkin child.getPath() :" + child.getPath());
VersionHistory history = vm.getVersionHistory(child.getPath());
for (VersionIterator it = history.getAllVersions(); it.hasNext();) {
Version version = (Version) it.next();
System.out.println("Version: " + version.getName() + " created on "
+ version.getCreated().getTime());
}
vm.checkout(child.getPath());
System.out.println("restoring checkout child.getPath() :"
+ child.getPath());
session.logout();
ns.dispose();
// vm.restore(firstVersion, true);
}
}
通过上面的代码，我正在对文件进行更改并反复保存该文件，以便按如下方式创建其版本。
版本：1.0创建于2017年7月17日星期一15:00:00 IST 2017
版本：1.1于2017年7月17日星期一15:00:00创建
版本：1.2创建于2017年7月17日星期一15:07:12 IST 2017
...
我不确定我的代码是否实际保存了mongo DB中的每个版本的文件数据，或者只保存了最后一个（覆盖）。
现在，通过下面的代码我试图根据他们的版本获取文件内容（数据），但我无法做到。
import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.IOException; import java.io.InputStream;
import javax.jcr.LoginException; import javax.jcr.Node; import javax.jcr.NodeIterator; import javax.jcr.Repository; import javax.jcr.RepositoryException; import javax.jcr.Session; import javax.jcr.version.Version; import javax.jcr.version.VersionHistory; import javax.jcr.version.VersionIterator; import javax.jcr.version.VersionManager;
import org.apache.jackrabbit.oak.Oak; import org.apache.jackrabbit.oak.commons.IOUtils; import org.apache.jackrabbit.oak.jcr.Jcr; import org.apache.jackrabbit.oak.plugins.document.DocumentMK; import org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore; import org.apache.jackrabbit.oak.spi.security.OpenSecurityProvider;
import com.mongodb.DB; import com.mongodb.MongoClient;
public class Retrive {
public static void main(String[] args) throws LoginException,
RepositoryException, IOException {
// TODO Auto-generated method stub
Node childNode;
DB db = new MongoClient("127.0.0.1", 27017).getDB("mydb");
DocumentNodeStore ns = new DocumentMK.Builder().setMongoDB(db)
.getNodeStore();
System.out.println("start");
Repository repo = new Jcr(new Oak(ns)).with(new OpenSecurityProvider())
.createRepository();
String multiPartFileName = "pdf";
Node document = null;
Node fileNode;
Session session = repo.login();
VersionManager vm = session.getWorkspace().getVersionManager();
Node root = session.getRootNode();
if (root.hasNode("pdfFileNode")) {
document = root.getNode("pdfFileNode");
System.out.println("pdfFileNode available");
}
NodeIterator nodeIterator = document.getNodes();
System.out.println("Size of nodeIterator :" + nodeIterator.getSize());
Node nameFile;
VersionHistory history = vm.getVersionHistory(document.getPath());
for (VersionIterator it = history.getAllVersions(); it.hasNext();) {
Version version = (Version) it.next();
System.out.println("Version: " + version.getName() + " created on "
+ version.getCreated().getTime());
if (version.getName().equals("1.1")) {
while (nodeIterator.hasNext()) {
nameFile = nodeIterator.nextNode();
String filename = nameFile.getName();
System.out.println("filename :" + filename);
if (filename.equals("pdf")) {
Node jcrContent = nameFile.getNode("jcr:content");
InputStream is = jcrContent.getProperty("jcr:data")
.getBinary().getStream();
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayOutputStream buf = new ByteArrayOutputStream();
int result = bis.read();
while (result != -1) {
byte b = (byte) result;
buf.write(b);
result = bis.read();
}
System.out.println("plain text: " + buf.toString());
break;
} else {
System.out.println("not found");
}
}
}
}
System.out.println("end");
}
}
任何人都可以让我知道缺少什么，或者根据版本检索所有文件内容（数据）的最佳方法是什么？