用Java解析文件

Question

im using the dropbox api. When i ask the api to get file listings from my account, it gives me this meta data which isn't in any particular format that i know of:

magnum-opus.txt: File("/magnum-opus.txt", iconName="page_white_text", mightHaveThumbnail=false, numBytes=17734, humanSize="17.3 KB", lastModified="2014/01/27 05:19:30 UTC", clientMtime="2014/01/27 05:19:30 UTC", rev="11e6c9e5e")

Since im not that good with strings i was hoping if someone could help me find a way to extract at least the filename ("/magnum-opus.txt"), and the 'lastmodified' and 'humansize' bits from above. Please and thank you :)

Answer 1

Assuming you're using one of the metadata methods in the official Java SDK (like getMetadata ) it sounds like you're doing toString and trying to manually parse this, which is unnecessary. This metadata method returns a DbxEntry (which you can convert to DbxEntry.File using asFile . You can then directly access the information you want on that object. Eg:

    DbxEntry.File fileInfo;
    try {
        fileInfo = dbxClient.getMetadata("/test.txt").asFile();
    }
    catch (DbxException ex) {
        ex.printStackTrace();
        System.err.println("Error in getMetadata(): " + ex.getMessage());
        System.exit(1); return;
    }
    System.out.println("fileInfo name: " + fileInfo.name);
    System.out.println("fileInfo lastModified: " + fileInfo.lastModified);
    System.out.println("fileInfo humanSize: " + fileInfo.humanSize);

Answer 2

Just String-playing...

String in = "magnum-opus.txt: File(\"/magnum-opus.txt\", iconName=\"page_white_text\", mightHaveThumbnail=false, numBytes=17734, humanSize=\"17.3 KB\", lastModified=\"2014/01/27 05:19:30 UTC\", clientMtime=\"2014/01/27 05:19:30 UTC\", rev=\"11e6c9e5e\")";
String insideParenth = in.substring(in.indexOf("(")+1, in.length()-1);
StringTokenizer tokenizer = new StringTokenizer(insideParenth, ", ");
while (tokenizer.hasMoreTokens()) {
    Map<String,String> properties = new HashMap<String,String>();
    String token = tokenizer.nextToken();
    if(token.contains("=")){
        token = token.replaceAll("\"", "");
        String left= token.substring(0, token.indexOf("="));
        String right=token.substring(token.indexOf("=")+1);
        properties.put(left,right );
        System.out.println("left:["+left+"] and right=[" + right + "]");        
    }
}

Output is:

left:[iconName] and right=[page_white_text]
left:[mightHaveThumbnail] and right=[false]
left:[numBytes] and right=[17734]
left:[humanSize] and right=[17.3]
left:[lastModified] and right=[2014/01/27]
left:[clientMtime] and right=[2014/01/27]
left:[rev] and right=[11e6c9e5e]

EDIT:

String titleWithPath, titleWithoutPath;

insideParenth = in.substring(in.indexOf("(")+1, in.length()-1); 
titleWithPath = insideParenth.substring(insideParenth.indexOf("\"")+1, insideParenth.indexOf(",")‌​-1); 
System.out.println(titleWithPath); //Prints out: "/magnum-opus.txt" 

String titleWithoutPath = insideParenth.substring(insideParenth.indexOf("/")+1, insideParenth.indexOf(",")-1 ); 
System.out.println(titleWithoutPath); //Prints out: "magnum-opus.txt"

Answer 3

First remove the part of the string up to the File(

String theString = "magnum-opus.txt: File("/magnum-opus.txt", iconName="page_white_text", mightHaveThumbnail=false, numBytes=17734, humanSize="17.3 KB", lastModified="2014/01/27 05:19:30 UTC", clientMtime="2014/01/27 05:19:30 UTC", rev="11e6c9e5e")";

theString = theString.replaceAll("^.*.File\\(","");

then remove the last character the "(".

theString = theString.replaceAll("\\)","");

Then you could just perform splits to get the information

HashMap<String,String> results = new HashMap<String,String>();
String[] arr = theString.split(",");
for(String s : arr) {
  s = s.replace("\"","");
  s = s.trim();
  if(s.contains("=")) {
     String[] tmp = s.split("=");
     results.put(tmp[0],tmp[1]);
  }
  else {
    results.put("filename",s);
  }
}

The above should produce a HashMap of key, values from that string.