如何在Java中搜索键/值对的字符串 [英] How to search a string of key/value pairs in Java

问题描述

我有一个这样格式化的字符串:

I have a String that's formatted like this:

"key1 = value1; key2 = value2; key3 = value3"

任意数量的键/值对.

我需要检查某个键是否存在(假设它称为"specialkey").如果是这样，我想要与之关联的值.如果设置了多个特殊键"，我只想要第一个.

I need to check that a certain key exists (let's say it's called "specialkey"). If it does, I want the value associated with it. If there are multiple "specialkey"s set, I only want the first one.

现在，我正在寻找"specialkey"的索引.我从该索引处开始获取一个子字符串，然后查找第一个 = 字符的索引.然后，我寻找第一个; 字符的索引.这两个索引之间的子字符串为我提供了与"specialkey"相关联的值.

Right now, I'm looking for the index of "specialkey". I take a substring starting at that index, then look for the index of the first = character. Then I look for the index of the first ; character. The substring between those two indices gives me the value associated with "specialkey".

这不是一个优雅的解决方案，确实让我感到困扰.查找与"specialkey"相对应的值的一种优雅方法是什么?

This is not an elegant solution, and it's really bothering me. What's an elegant way of finding the value that corresponds with "specialkey"?

推荐答案

使用

这将为您提供一个包含以下元素的数组 kvPairs :

This will give you an array kvPairs that contains these elements:

key1=value1
key2=value2
key3=value3

遍历并拆分它们:

for(String kvPair: kvPairs) {
   String[] kv = kvPair.split("=");
   String key = kv[0];
   String value = kv[1];

   // Now do with key whatever you want with key and value...
   if(key.equals("specialkey")) {
       // Do something with value if the key is "specialvalue"...
   }
}

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