浅谈常用字符串与集合类转换的工具类

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 {  /**   * 将字符串转换成set集合类   * 分隔符是任意空白字符   */  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+]");//匹配任意空白字符      result.addAll(Arrays.asList(tokens));    }    return result;  }  /**   * 把集合转化成指定形式的字符串   */  public static String formatParameterList(Collection<String> value) {    return value == null ? null : StringUtils.collectionToDelimitedString(value, ",");//指定分隔符  }  /**   * 从query的字符串中抽取需要的键值对存入map中   * query的形式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;  }  /**   * 比较两个集合是否相等   */  public static boolean containsAll(Set<String> target, Set<String> members) {    target = new HashSet<String>(target);    target.retainAll(members);//取两个集合的交集    return target.size() == members.size();  }}