Java 如何比较2个XML文件以及如何使用XMLUnit获取新添加\删除的元素等信息

我有两个结构几乎相似的xml文件，在这些xml文件中如何获取以下信息

新添加的控件（或节点）

移除并删除控件（或节点）

控件（或节点）属性已修改

为了向您提供信息，我尝试了以下代码：

    File f1 = new File(inputXMLPath);
    File f2= new File(outputXMLPath);
    FileReader fr1 = null;
    FileReader fr2 = null;
    try {
        fr1 = new FileReader(f1);
        fr2 = new FileReader(f2);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    try {
        Diff diff = new Diff(fr1, fr2);
        System.out.println("Similar? " + diff.similar());
        System.out.println("Identical? " + diff.identical());

        DetailedDiff detDiff = new DetailedDiff(diff);

        detDiff.overrideDifferenceListener(new DifferenceListener() {
            @Override
            public int differenceFound(Difference diff) {
                if (diff.getId() == DifferenceConstants.CHILD_NODELIST_SEQUENCE_ID
                    || diff.getId() == DifferenceConstants.CHILD_NODELIST_LENGTH_ID) {
                    return RETURN_IGNORE_DIFFERENCE_NODES_IDENTICAL;
                }
                return RETURN_ACCEPT_DIFFERENCE;
            }
            @Override
            public void skippedComparison(Node arg0, Node arg1) { }

        });


        List differences = detDiff.getAllDifferences();
        for (Object object : differences) {
            Difference difference = (Difference)object;
            System.out.println("***********************");
            System.out.println(difference);
            System.out.println("***********************");
        }

    } catch (SAXException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

---

[编辑：添加了关于

setCompareUnmatched

和示例代码的注释]

我想您应该对未找到的

子节点
差异做出反应，如果使用
XMLUnit.setCompareUnmatched（false）
，XMLUnit 1.x将发出这些差异

如果差异的控制节点为空，则添加该节点-如果测试节点为空，则删除该节点。任何其他区别都是对XMLUnit认为存在于任意一侧的节点的更改

比如说

    FileReader fr1 = new FileReader(f1);
    FileReader fr2 = new FileReader(f2);
    XMLUnit.setCompareUnmatched(false);
    Diff diff = new Diff(fr1, fr2);
    System.out.println("Similar? " + diff.similar());
    System.out.println("Identical? " + diff.identical());

    DetailedDiff detDiff = new DetailedDiff(diff);

    detDiff.overrideDifferenceListener(new DifferenceListener() {
        @Override
        public int differenceFound(Difference diff) {
            if (diff.getId() == DifferenceConstants.CHILD_NODELIST_SEQUENCE_ID
                || diff.getId() == DifferenceConstants.CHILD_NODELIST_LENGTH_ID) {
                return RETURN_IGNORE_DIFFERENCE_NODES_IDENTICAL;
            }
            return RETURN_ACCEPT_DIFFERENCE;
        }
        @Override
        public void skippedComparison(Node arg0, Node arg1) { }

    });


    List differences = detDiff.getAllDifferences();
    for (Object object : differences) {
        Difference difference = (Difference)object;
        System.out.println("***********************");
        if (difference.getId() == DifferenceConstants.CHILD_NODE_NOT_FOUND_ID) {
            if (difference.getControlNodeDetail().getNode() == null) {
                System.out.println("Node was added");
            } else {
                System.out.println("Node was removed");
            }
        }
        System.out.println("***********************");
    }

会导致类似的结果

***********************
Expected presence of child node 'baz' but was 'null' - comparing <baz...> at /foo[1]/baz[1] to  at null
Node was removed
***********************
***********************
Expected presence of child node 'null' but was 'xyzzy' - comparing  at null to <xyzzy...> at /foo[1]/xyzzy[1]
Node was added
***********************

***********************
应存在子节点“baz”，但为“null”-将at/foo[1]/baz[1]与at null进行比较
节点被删除
***********************
***********************
应存在子节点“null”，但为“xyzy”-将null处的值与/foo[1]/xyzy[1]处的值进行比较
已添加节点
***********************
检查他们的控件新添加/删除的信息不是第一个xml文件。它总是盲目地比较内容，而我编写的代码（或XMLUnit API）没有像新添加/删除的节点等那样进行出色的比较。请您帮助我完成这项工作。非常感谢您的建议@SuperBiasedMan:我已经发布了代码。。你能给我一个建议吗？谢谢你的回答。。你能用任何示例代码来说明吗。这样我才能更好地理解。有一件事我忘了明确提到，Ragu，那就是
setCompareUnmatched
方法，您需要它来帮助我们绕过XMLUnit1的默认行为。谢谢您的回答。粘贴代码后。我在比较过程中遇到了一些问题。添加\删除的节点信息似乎不正确。我已在下面的链接：[link]（）中上载了2个xml文件（用于比较），您可以看到XMLUnit显示的结果（已添加\删除的节点）似乎不正确。Stefan:我是否需要做任何其他事情（如实现任何接口…）解决比较过程中的此类问题。