【发布时间】：2013-06-27 14:29:46
【问题描述】：
在我的程序中，我试图获取我的文件夹中某些项目的最后修改日期，但我无法访问该信息。
根据box API的文档和java库的javadoc，BoxTypedObject的以下任何方法都应该返回我想要的信息：
-
getModifiedAt()应以 ISO 8601 格式返回String日期。 -
getModifiedDate()应该为日期返回一个Date对象。 -
getValue("modified_at")还应该返回一个 ISO 8601 格式的String作为日期。 -
getExtraData("modified_at")也是一种可能的方式，虽然我不太确定。
但是，这些方法都不适合我；他们都只是返回null。
我用来检索日期的（大大简化的）代码如下，上面的方法之一代替了注释块：
private static void printAll(BoxFolder boxFolder){
for(BoxTypedObject file : boxFolder.getItemCollection().getEntries())
System.out.printf("[\"%1$s\" %2$s]%n",
file.getValue("name"), file./*[???]*/);
}
其他字段都返回正确的值，只有当我尝试获取日期时它才会失败。
如何检索
BoxTypedObjects 的修改日期？
编辑：我想出了一种方法来获得它，但它有点慢。
client.getFilesManager().getFile(file.getId(), null).getModifiedAt()
检索日期。不过，如果有更好的方法，我仍然很感兴趣。
其他信息（可能与问题相关，也可能不相关）：
盒子客户端的认证由以下类处理：
import java.awt.Desktop;
import java.io.*;
import java.net.*;
import com.box.boxjavalibv2.BoxClient;
import com.box.boxjavalibv2.dao.BoxOAuthToken;
import com.box.boxjavalibv2.exceptions.*;
import com.box.boxjavalibv2.requests.requestobjects.BoxOAuthRequestObject;
import com.box.restclientv2.exceptions.BoxRestException;
/**
* This class handles the storage and use of authentication keys, to
* simplify the process of obtaining n authenticated client. This class
* will store refresh keys in a file, so that it can authenticate a client
* without needing for user intervention.
* <p>
* Copyright 2013 Mallick Mechanical, Inc.
*
* @author Anson Mansfield
*/
public class Authenticator {
/**
* Constructs an {@code Authenticator} for use obtaining
* authenticated {@Code BoxClient}s
*
* @param key The OAuth client id and application key.
* @param secret The OAuth client secret.
* @param authFile The file to be used for storing authentications
* for later use.
*/
public Authenticator(String key, String secret, File authFile){
this.key = key;
this.secret = secret;
this.authFile = authFile;
}
/**
* Constructs a new {@Code BoxClient} object, authenticates it,
* and returns it.
*/
public BoxClient getAuthenticatedClient(){
BoxClient client = new BoxClient(key,secret);
client.authenticate(getToken(client));
return client;
}
public final String host = "http://localhost";
public final int port = 4000;
public final String key, secret;
public final File authFile;
public final String url = "https://www.box.com/api/oauth2/authorize?response_type=code&client_id=";
/**
* Obtains a token that can be used to authenticate the box client,
* and stores its refresh value in a file, so it can be used later.
* @param client The client to obtain a token for.
* @return A token that can be used to authenticate the client, or
* {@code null} if one could not be obtained.
*/
private BoxOAuthToken getToken(BoxClient client){
BoxOAuthToken token = null;
try{
if((token = getOldToken(client)) != null) return token;
if((token = getNewToken(client)) != null) return token;
return token;
}finally{
writeNewToken(token);
}
}
/**
* Attempts to write a token's refresh token to a file.
* @param token The token whose refresh value is to be written.
*/
private void writeNewToken(BoxOAuthToken token) {
if(token != null)
try(BufferedWriter out = new BufferedWriter(new FileWriter(authFile))){
out.write(token.getRefreshToken());
}catch(IOException ex){
System.out.println("couldn't update new token");
}
}
/**
* Reads the last session's refresh token from a file and attempts
* to get a new authentication token with it.
* @param client The client for which the authentication token is for.
* @return The token obtained from the refresh, or {@code null} if one
* could not be obtained.
*/
private BoxOAuthToken getOldToken(BoxClient client) {
System.out.println("attempting to use old token");
BoxOAuthToken token = null;
try(BufferedReader in = new BufferedReader(new FileReader(authFile))){
token = client.getOAuthManager().refreshOAuth(
BoxOAuthRequestObject.refreshOAuthRequestObject(
in.readLine(), key, secret
));
System.out.println("refreshed old token");
}catch(IOException ex){
System.out.println("couldn't read old token");
} catch(BoxRestException | BoxServerException | AuthFatalFailureException ex){
System.out.println("couldn't refresh old token");
}
return token;
}
/**
* Connects to the OAuth server and gets a new authentication token.
* @param client The client to get a token for.
* @return The new token obtained from the server, or {@code null} if one could not be obtained.
*/
private BoxOAuthToken getNewToken(BoxClient client) {
System.out.println("attempting to get new token");
BoxOAuthToken token = null;
try {
Desktop.getDesktop().browse(java.net.URI.create(url + key));
token = client.getOAuthManager().createOAuth(
BoxOAuthRequestObject.createOAuthRequestObject(getCode(), key, secret, host + port)
);
} catch (BoxRestException | BoxServerException | AuthFatalFailureException | IOException ex) {
ex.printStackTrace();
return null;
}
return token;
}
/**
* This listens on the configured port for the code included in the callback.
* It also deploys a script on the receiving socket to close the browser tab navigating to it.
* @return The authentication code to generate a token with.
*/
private String getCode(){
try (ServerSocket serverSocket = new ServerSocket(port);
Socket socket = serverSocket.accept();
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(socket.getOutputStream());){
out.println("<script type=\"text/javascript\">");
out.println( "window.open('', '_self', '');");
out.println( "window.close();");
out.println("</script>"); //Close the tab
while (true){
String code = "";
code = in.readLine ();
System.out.println(code);
String match = "code";
int loc = code.indexOf(match);
if( loc >0 ) {
int httpstr = code.indexOf("HTTP")-1;
code = code.substring(code.indexOf(match), httpstr);
String parts[] = code.split("=");
code=parts[1];
return code;
} else {
// It doesn't have a code
}
}
} catch (IOException | NullPointerException e) {
return "";
}
}
}
将获得修改字段的实际类（但尚未完成）：
import java.io.File;
import java.util.Scanner;
import com.box.boxjavalibv2.BoxClient;
import com.box.boxjavalibv2.dao.BoxFolder;
import com.box.boxjavalibv2.dao.BoxTypedObject;
/**
* Copyright 2013 Mallick Mechanical, Inc.
*
* @author Anson Mansfield
*/
public class BoxStuff {
static BoxClient client;
public void main(String ... args) throws Exception {
client = new Authenticator(args[0], args[1], new File(args[2]))
.getAuthenticatedClient();
userSelectFolder("Select the project folder");
}
private static BoxFolder userSelectFolder(String prompt) throws Exception{
Scanner kbd;
if(System.console()!=null)
kbd = new Scanner(System.console().reader());
else
kbd = new Scanner(System.in);
String line = "";
System.out.println();
System.out.println(prompt);
System.out.println("(leave prompt blank to select folder)");
BoxFolder current = client.getFoldersManager().getFolder("0", null);
printAll(current);
System.out.print("select>");
while(!(line = kbd.nextLine()).isEmpty()){
BoxFolder next = select(current, Integer.parseInt(line));
if(next != null) current = next;
printAll(current);
System.out.print("select>");
}
return current;
}
private static void printAll(BoxFolder boxFolder){
int idx=0;
System.out.println(" 0:[parent folder]");
for(BoxTypedObject file : boxFolder
.getItemCollection()
.getEntries()){
if(file.getType().equals("folder")){
System.out.printf("%1$3d:[%2$-32s %3$-6s %4$-9s]%n",
++idx, format((String) file.getValue("name"),30), file.getType(), file.getId());
} else {
System.out.printf(" [%1$-32s %2$-6s %3$-9s Edit:%4$s]%n",
format((String) file.getValue("name"),32), file.getType(), file.getId(), file.getExtraData("modified_at"));
}
}
}
private static String format(CharSequence source, int length){
StringBuilder b = new StringBuilder(length);
b.append('"');
if(source.length() > 30)
b.append(source.subSequence(0, 29)).append('~');
else
b.append(String.format("%1$-30s",source));
b.append('"');
return b.toString();
}
private static BoxFolder select(BoxFolder boxFolder, int i) throws Exception{
int idx=0;
for(BoxTypedObject file : boxFolder.getItemCollection().getEntries()){
if(file.getType().equals("folder") && ++idx == i){
return client.getFoldersManager().getFolder(file.getId(), null);
}
}
if(idx==0){
if(boxFolder.getParent() == null)
return client.getFoldersManager().getFolder("0", null);
else
return client.getFoldersManager().getFolder(boxFolder.getParent().getId(), null);
}else{
System.out.println("Selection is out of range!");
return boxFolder;
}
}
}
如果其他人想使用这些类做某事，请问我。应该没问题（他们是机械承包商，不是软件公司），我只需要和老板说清楚（这个代码仍然属于公司）。
【问题讨论】：
标签： java box-api last-modified