Tool classes for commonly used string and collection class conversions

In the project, we often need to convert the received string to the corresponding collection class to save, or to convert the collection class to a string for easy transmission, this tool class encapsulates a few common methods, for this conversion requirements is very convenient.

1 Importjava.util.Arrays;2 Importjava.util.Collection;3 ImportJava.util.HashMap;4 ImportJava.util.HashSet;5 ImportJava.util.Map;6 Importjava.util.Properties;7 ImportJava.util.Set;8 ImportJava.util.TreeSet;9 Ten  Public classMystringutils { One  A     /** - * Converts a string into a set collection class - * Delimiter is any white space character the      */ -      Public StaticSet<string>parseparameterlist (String values) { -set<string> result =NewTreeset<string>(); -         if(Values! =NULL&& Values.trim (). Length () > 0) { +             //The spec says the scope is separated by spaces -string[] tokens = Values.split ("[\\s+]");//match any white space character + Result.addall (Arrays.aslist (tokens)); A         } at         returnresult; -     } -  -     /** - * Convert a set into a string of a specified form -      */ in      Public StaticString Formatparameterlist (collection<string>value) { -         returnValue = =NULL?NULL: stringutils.collectiontodelimitedstring (Value, ",");//Specify delimiter to     } +  -     /** the * Extract the required key-value pairs from the query string into the map * * form of query Name=god&password=111&method=up $      */Panax Notoginseng      Public StaticMap<string, string>extractmap (String query) { -map<string, string> map =NewHashmap<string, string>(); theProperties Properties =Stringutils.splitarrayelementsintoproperties ( +Stringutils.delimitedlisttostringarray (Query, "&"), "="); A         if(Properties! =NULL) { the              for(Object key:properties.keySet ()) { + Map.put (key.tostring (), Properties.get (key). ToString ()); -             } $         } $         returnmap; -     } -  the     /** - * Compare whether two sets are equalWuyi      */ the      Public Static BooleanContainsall (set<string> target, set<string>Members ) { -target =NewHashset<string>(target); WuTarget.retainall (members);//take the intersection of two sets -         returnTarget.size () = =members.size (); About     } $}

Tool classes for commonly used string and collection class conversions