在java中评估字符串上的xpath并返回结果字符串的简单方法是什么 [英] What's a simple way in java to evaluate an xpath on a string and return a result string

问题描述

一个简单问题需要一个简单的答案。

A simple answer needed to a simple question.

例如：

String xml = "<car><manufacturer>toyota</manufacturer></car>";
String xpath = "/car/manufacturer";
assertEquals("toyota",evaluate(xml, xpath));

如何以简单易读的方式编写evaluate方法，该方法适用于任何给定的格式xml和xpath。

How can I write the evaluate method in simple and readable way that will work for any given well-formed xml and xpath.

显然有很多方法可以实现，但大多数人看起来非常冗长。

Obviously there are loads of ways this can be achieved but the majority seem very verbose.

我缺少的任何简单方法/可以实现此目的的库？

Any simple ways I'm missing/libraries that can achieve this?

对于返回多个节点的情况，我只想要字符串表示。

For cases where multiple nodes are returned I just want the string representation of this.

推荐答案

在这里，您可以使用Java SE完成以下操作：

Here you go, the following can be done with Java SE:

import java.io.StringReader;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;
import org.xml.sax.InputSource;

public class Demo {

    public static void main(String[] args) throws Exception {
        String xml = "<car><manufacturer>toyota</manufacturer></car>";
        String xpath = "/car/manufacturer";
        XPath xPath = XPathFactory.newInstance().newXPath();
        assertEquals("toyota",xPath.evaluate(xpath, new InputSource(new StringReader(xml))));
    }

}

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