A brief discussion on the tool class for converting commonly used strings and sets

In projects, we often need to convert the received string into the corresponding collection class to save, or convert the collection class into a string for easy transmission. This tool class encapsulates several commonly used methods, which is very convenient for this conversion requirement.

 import java.util.Arrays;import java.util.Collection;import java.util.HashMap;import java.util.HashSet;import java.util.Map;import java.util.Properties;import java.util.Set;import java.util.TreeSet;public class MyStringUtils { /** * Convert strings to set collection class* The delimiter is any whitespace character*/ public static Set<String> parseParameterList(String values) { Set<String> result = new TreeSet<String>(); if (values ​​!= null && values.trim().length() > 0) { // the spec says the scope is separated by spaces String[] tokens = values.split("[//s+]");//Match any whitespace character result.addAll(Arrays.asList(tokens)); } return result; } /** * Convert the collection into a string of the specified form*/ public static String formatParameterList(Collection<String> value) { return value == null ? null : StringUtils.collectionToDelimitedString(value, ",");//Specify the delimiter} /** * Extract the required key-value pair from the string of the query and store it in the map* The form of query name=god&password=111&method=up */ public static Map<String, String> extractMap(String query) { Map<String, String> map = new HashMap<String, String>(); Properties properties = StringUtils.splitArrayElementsIntoProperties( StringUtils.delimitedListToStringArray(query, "&"), "="); if (properties != null) { for (Object key : properties.keySet()) { map.put(key.toString(), properties.get(key).toString()); } } return map; } /** * Compare whether two sets are equal*/ public static boolean containsAll(Set<String> target, Set<String> members) { target = new HashSet<String>(target); target.retainAll(members);//Get the intersection of two sets return target.size() == members.size(); }}

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