减去java文本字符串 [英] subtract java text string

问题描述

我想从URL中提取引用.

I want to extract the reference from an URL.

例如，我的网址如下:

"https://www.amazon.es/Lenovo-YOGA-520-14IKB-Ordenador-convertible/dp/B071WBF4PZ/"

我只想获取参考零件，即 B071WBF4PZ

I want to get only the reference part, that is B071WBF4PZ

我还想从这个html元素中提取价格:

I also want to extract the price from this html element:

"<div id="cerberus-data-metrics" style="display: none;" data-asin="B078ZYX4R5" data-asin-price="1479.00" data-asin-shipping="0" data-asin-currency-code="EUR" data-substitute-count="0" data-device-type="WEB" data-display-code="Asin is not eligible because it has a retail offer" ></div>"

我只需要获取属性 data-asin-price 的值.

I need to get only the value of the attribute data-asin-price.

可以用indexOf', substring or split`来完成，但我不知道该怎么做.

It could be done with indexOf',substringorsplit` but I don't get how to do it.

推荐答案

• 参考部分:

代码:

String url = "https://www.amazon.es/Lenovo-YOGA-520-14IKB-Ordenador-convertible/dp/B071WBF4PZ/";

String[] parts = string.split("/");
// parts : 
// [0] = "https:"
// [1] = ""
// [2] =  "www.amazon.es"
// [3] = "Lenovo-YOGA-520-14IKB-Ordenador-convertible"
// [4] = "dp"
// [5] = "B071WBF4PZ"
// [6] = ""

String reference = parts[5]; // < this is the reference.

但是，我建议使用常规表达式/模式

并在访问[5]

• 价格部分:

使用 Jsoup ，您可以轻松解析html并提取诸如data-asin-price的属性.在这种情况下，我不会使用正则表达式.但是，正则表达式不需要额外的库.

Using Jsoup you can easily parse html and extract properties like data-asin-price. In this case I would not use Regular Expressions. However Regular expressions don't need extra libraries.

此正则表达式:

(?:data-asin-price=")(\w*.\w*)

将匹配data-asin-price="之后的任何数字-因此匹配组1将是:1479.00

will match any number after data-asin-price=" - so the match group 1 will be: 1479.00

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