使用jetty和mongodb实现简易网盘接口
依赖库：1，jetty（提供http方式接口）
2，mongodb的java驱动（访问mongodb存取文件）
3，thumbnailator包，进行缩略图生成
4，commons-fileupload包及commons-io包用于处理文件上传
架构图：
入口代码如下：
package com.ciaos.vfs;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.nio.SelectChannelConnector;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.eclipse.jetty.util.thread.QueuedThreadPool;
public class VfsServer {
public static void main(String[] args) throws Exception {
SelectChannelConnector connector = new SelectChannelConnector();
connector.setHost("127.0.0.1");
connector.setPort(8080);
connector.setThreadPool(new QueuedThreadPool(200));
Server server = new Server();
server.setConnectors(new Connector[]{connector});
ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
context.setContextPath("/");
server.setHandler(context);
context.addServlet(new ServletHolder(new VfsFileServlet()), "/file");
server.start();
server.join();
}
}
业务代码如下：
package com.ciaos.vfs;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.UnknownHostException;
import java.util.List;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.coobird.thumbnailator.Thumbnails;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.bson.types.ObjectId;
import com.mongodb.DB;
import com.mongodb.Mongo;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
import com.mongodb.gridfs.GridFSInputFile;
public class VfsFileServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 5586455171943232770L;
private String tempPath = null;
private Mongo mongo = null;
final private String MongoDbIp = "127.0.0.1";
final private Integer MongoDbPort = 27017;
@Override
public void init() throws ServletException {
// TODO Auto-generated method stub
tempPath = "/tmp/";
try {
mongo=new Mongo(MongoDbIp, MongoDbPort);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.exit(-1);
}
super.init();
}
@Override
protected void doDelete(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
String fileId = req.getParameter("id");
String MongoDbName = req.getParameter("type");
if(fileId == null || MongoDbName == null){
resp.sendError(400,"bad request");
return;
}
DB db=mongo.getDB(MongoDbName);
GridFS gridFS=new GridFS(db);
try{
gridFS.remove(new ObjectId(fileId));
}
catch(IllegalArgumentException ex){
resp.sendError(404,"file not found");
return;
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
String fileId = req.getParameter("id");
String MongoDbName = req.getParameter("type");
if(fileId == null || MongoDbName == null){
resp.sendError(400,"bad request");
return;
}
DB db=mongo.getDB(MongoDbName);
GridFS gridFS=new GridFS(db);
GridFSDBFile mongofile = null;
try{
mongofile = gridFS.find(new ObjectId(fileId));
}
catch(IllegalArgumentException ex){
resp.sendError(404,"file not found");
return;
}
if(mongofile!=null){
resp.setHeader("Content-type", mongofile.getContentType());
resp.setHeader("Content-Disposition", "attachment; filename= "+mongofile.getFilename());
mongofile.put("viewtimes", (Integer)mongofile.get("viewtimes")+1);
ServletOutputStream out = resp.getOutputStream();
String dtype = req.getParameter("act");
if(dtype!=null && dtype.equals("preview")){
Integer width = 0, height = 0;
try{
width = Integer.parseInt(req.getParameter("w"));
height = Integer.parseInt(req.getParameter("h"));
BufferedImage image = ImageIO.read(mongofile.getInputStream());
width = Math.min(width,image.getWidth());
height = Math.min(height,image.getHeight());
Thumbnails.of(mongofile.getInputStream())
.size(width, height)
.toOutputStream(out);
}
catch(NumberFormatException ex){
resp.sendError(400,"bad request");
return;
}
}else{
InputStream input = mongofile.getInputStream();
byte[] buffer = new byte;
for(;;)
{
int count = input.read(buffer);
if (count < 0)
break;
out.write(buffer,0,count);
}
}
out.flush();
out.close();
mongofile.save();
}else{
resp.sendError(500,"internal server error");
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doPut(req, resp);
}
@Override
protected void doPut(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
req.setCharacterEncoding("utf-8");
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setRepository(new File(tempPath));
factory.setSizeThreshold(8 * 1024 * 1024);
ServletFileUpload upload = new ServletFileUpload(factory);
try {
List list = (List) upload.parseRequest(req);
for (FileItem item : list) {
if (item.isFormField()) {
} else {
String value = item.getName();
int start = value.lastIndexOf("\\");
String filename = value.substring(start + 1);
String MongoDbName = req.getParameter("type");
if(MongoDbName == null){
resp.sendError(400,"bad request");
return;
}
DB db=mongo.getDB(MongoDbName);
GridFS gridFS=new GridFS(db);
GridFSInputFilemongofile=gridFS.createFile(item.getInputStream());
mongofile.put("viewtimes",0);
mongofile.setContentType(item.getContentType());
mongofile.put("filename", filename);
mongofile.save();
resp.getWriter().println(mongofile);
resp.getWriter().flush();
}
}
} catch (Exception e) {
e.printStackTrace();
resp.sendError(500,"internal server error");
}
}
}
运行方法一（eclipse很简单不用介绍，linux命令行运行方法，大于8M文件通过/tmp/目录缓存）：
javac -cp .:../libs/* com/speakbang/vfs/*.java -Xlint:deprecation
java -cp .:../libs/* com/speakbang/vfs/VfsServer
运行方法二（只需要VfsFileServlet.java，集成到jetty配置文件）
root:~/jetty/webapps # ls -R *
ROOT:
WEB-INF
classes
com/ciaos/vfs/VfsFileServlet.class
lib
commons-fileupload-1.3.1.jarcommons-io-2.4.jarmongo-java-driver-2.11.4.jarthumbnailator-0.4.7.jar
src
com/ciaos/vfs/VfsFileServlet.java
web.xml
web.xml
VfsServlet
com.ciaos.vfs.VfsFileServlet
0
VfsServlet
/file
cd webapps/ROOT/WEB-INF/src/
javac -cp .:../lib/*:../../../../lib/* com/ciaos/vfs/VfsFileServlet.java -Xlint:deprecation
mv com/ciaos/vfs/VfsFileServlet.class ../classes/com/ciaos/vfs/
cd ../../../../
java -jar start.jar -Xms128m -Xmx256m
(bin/jetty.sh start|restart|stop)
运行方法三（将class文件打成jar包，放到lib目录下，可以不用放置src和classes目录及源码了）
cd classes/
jar cvf vfs.jar com
cd ..
mv classes/vfs.jar lib/
rm -rf classes src
cd ../../
java -jar start.jar
注意文件不能直接操作db.fs.files.remove()删除，fs.chunks这个collection里面才是包含文件内容的，正确的删除方法使用如下脚本或者调用DELETE接口，删除完毕后用db.repairDatabase()释放磁盘空间：
var year=2014
var month=3
var day=15
use test
var items = db.fs.files.find({uploadDate:{$lte:new Date(year+"/"+month+"/"+day)}})
items.forEach(function(item) {
db.fs.chunks.remove({files_id: item._id})
db.fs.files.remove({_id:item._id})
print(item._id + " deleted")
})
//运行方法： bin/mongo < tool/delete.js
//root:~/mongodb$ bin/mongo < tool/delete.js
//MongoDB shell version: 2.4.9
//connecting to: test
//switched to db test
//532259170cf2c0bcb68e1e72 deleted
//532259190cf2c0bcb68e1e76 deleted
//5322591a0cf2c0bcb68e1e7a deleted
//bye
使用方法：
上传：curl -F "action=upload" -F "Filedata=@a.png;type=image/png" -v "http://127.0.0.1:8080/file?type=test"
{ "_id" : { "$oid" : "531c5fe6744e22f4c22eeef5"} , "chunkSize" : 262144 , "length" : 1033834 , "md5" : "04bc7c0988ecc04f93cfa96f239dda99" , "filename" : "a.png" , "contentType" :null, "viewtimes" : 0 , "uploadDate" : { "$date" : "2014-03-09T12:34:46.347Z"} , "aliases" :null }
下载：curl -o /dev/null -v http://127.0.0.1:8080/file?type=test&id=531c5fe6744e22f4c22eeef5&act=preview&w=200&h=200
删除:curl -X DELETE -v "http://127.0.0.1:8080/file?type=test&id=531c5fe6744e22f4c22eeef5"
Java代码上传方法（支持多文件上传）
package com.test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
/**
* This utility class provides an abstraction layer for sending multipart HTTP
* POST requests to a web server.
* @author www.codejava.net
*
*/
public class MultipartUtility {
private final String boundary;
private static final String LINE_FEED = "\r\n";
private HttpURLConnection httpConn;
private String charset;
private OutputStream outputStream;
private PrintWriter writer;
/**
* This constructor initializes a new HTTP POST request with content type
* is set to multipart/form-data
* @param requestURL
* @param charset
* @throws IOException
*/
public MultipartUtility(String requestURL, String charset)
throws IOException {
this.charset = charset;
// creates a unique boundary based on time stamp
boundary = "===" + System.currentTimeMillis() + "===";
URL url = new URL(requestURL);
httpConn = (HttpURLConnection) url.openConnection();
httpConn.setUseCaches(false);
httpConn.setDoOutput(true); // indicates POST method
httpConn.setDoInput(true);
httpConn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
outputStream = httpConn.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
true);
}
/**
* Adds a form field to the request
* @param name field name
* @param value field value
*/
public void addFormField(String name, String value) {
writer.append("--" + boundary).append(LINE_FEED);
writer.append("Content-Disposition: form-data; name=\"" + name + "\"")
.append(LINE_FEED);
writer.append("Content-Type: text/plain; charset=" + charset).append(
LINE_FEED);
writer.append(LINE_FEED);
writer.append(value).append(LINE_FEED);
writer.flush();
}
/**
* Adds a upload file section to the request
* @param fieldName name attribute in
* @param uploadFile a File to be uploaded
* @throws IOException
*/
public void addFilePart(String fieldName, File uploadFile)
throws IOException {
String fileName = uploadFile.getName();
writer.append("--" + boundary).append(LINE_FEED);
writer.append(
"Content-Disposition: form-data; name=\"" + fieldName
+ "\"; filename=\"" + fileName + "\"")
.append(LINE_FEED);
writer.append(
"Content-Type: "
+ URLConnection.guessContentTypeFromName(fileName))
.append(LINE_FEED);
writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
writer.append(LINE_FEED);
writer.flush();
FileInputStream inputStream = new FileInputStream(uploadFile);
byte[] buffer = new byte;
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.flush();
inputStream.close();
writer.append(LINE_FEED);
writer.flush();
}
/**
* Adds a header field to the request.
* @param name - name of the header field
* @param value - value of the header field
*/
public void addHeaderField(String name, String value) {
writer.append(name + ": " + value).append(LINE_FEED);
writer.flush();
}
/**
* Completes the request and receives response from the server.
* @return a list of Strings as response in case the server returned
* status OK, otherwise an exception is thrown.
* @throws IOException
*/
public List finish() throws IOException {
List response = new ArrayList();
writer.append(LINE_FEED).flush();
writer.append("--" + boundary + "--").append(LINE_FEED);
writer.close();
// checks server's status code first
int status = httpConn.getResponseCode();
if (status == HttpURLConnection.HTTP_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(
httpConn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
response.add(line);
}
reader.close();
httpConn.disconnect();
} else {
throw new IOException("Server returned non-OK status: " + status);
}
return response;
}
public static void main(String[] args) {
String charset = "UTF-8";
File uploadFile1 = new File("c:/1.jpg");
File uploadFile2 = new File("c:/2.jpg");
String requestURL = "http://localhost:8080/file?type=test";
try {
MultipartUtility multipart = new MultipartUtility(requestURL, charset);
/*
multipart.addHeaderField("User-Agent", "CodeJava");
multipart.addHeaderField("Test-Header", "Header-Value");
multipart.addFormField("description", "Cool Pictures");
multipart.addFormField("keywords", "Java,upload,Spring");
*/
multipart.addFilePart("fileUpload", uploadFile1);
multipart.addFilePart("fileUpload", uploadFile2);
List response = multipart.finish();
for (String line : response) {
System.out.println(line);
}
//output
//533e27560cf2f5c3e3d77748
//533e27560cf2f5c3e3d7774a
} catch (IOException ex) {
System.err.println(ex);
}
}
}
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