java代码如何从下面字符串中取出想要的字符串

Question

{"chain_name":"辛醇产业链","product":{"product_name":"异辛醇","introduction_title":"辛醇介绍","product_introduction":"","manufacturer_name":[]},"upstream_products":[{"product_name":"丙烯","introduction_title":"","product_introduction":"","manufacturer_name":[]}],"downstream_products":[{"product_name":"油酸异辛酯","introduction_title":"","product_introduction":"","manufacturer_name":[]},{"product_name":"棕榈酸异辛酯","introduction_title":"","product_introduction":"","manufacturer_name":[]}]}
文件如上，比较长，是一行，现在想 将string key = 异辛醇（product里的），string from = 丙烯（upstream_products里的），string to = 油酸异辛酯，棕榈酸异辛酯（downstream_products里的），其实就是从这串字符中将这些字符串取出来，我是新手，还搞不清楚，希望大神帮忙，要代码，谢谢。

Answer 1

你上面是json字符串啊，你是怎么得到的，把他转换成map不就直接提取出来追问

你好，我是新手，这些是json文件，我已经读出来了，现在就是取这些字符串的时候遇到了问题，你说的转成map直接提取是什么意思？谢谢

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