


A brief discussion on commonly used tools for converting strings and collections
在项目中,我们经常需要把接收到的字符串转换成对应的集合类保存,或者把集合类转换成字符串以方便传输,这个工具类中封装了几个常用的方法,对于这种转换需求十分方便。
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(); } }
以上这篇浅谈常用字符串与集合类转换的工具类就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持PHP中文网。
更多浅谈常用字符串与集合类转换的工具类相关文章请关注PHP中文网!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics





Troubleshooting and solutions to the company's security software that causes some applications to not function properly. Many companies will deploy security software in order to ensure internal network security. ...

Field mapping processing in system docking often encounters a difficult problem when performing system docking: how to effectively map the interface fields of system A...

When using MyBatis-Plus or other ORM frameworks for database operations, it is often necessary to construct query conditions based on the attribute name of the entity class. If you manually every time...

Start Spring using IntelliJIDEAUltimate version...

Conversion of Java Objects and Arrays: In-depth discussion of the risks and correct methods of cast type conversion Many Java beginners will encounter the conversion of an object into an array...

Solutions to convert names to numbers to implement sorting In many application scenarios, users may need to sort in groups, especially in one...

How to convert names to numbers to implement sorting within groups? When sorting users in groups, it is often necessary to convert the user's name into numbers so that it can be different...

Analysis of memory leak phenomenon of Java programs on different architecture CPUs. This article will discuss a case where a Java program exhibits different memory behaviors on ARM and x86 architecture CPUs...
