在Java中比较两个JSON时忽略数组中的特定节点

Question

我想比较Java 8中的两个JSON字符串是否相等，但忽略特定的已知节点，这些节点包含的值应该不同并且可以忍受，例如时间戳。当前使用的是来自org.SkyScreamer的JSONAssert v1.5.0，我能够“忽略”许多这样的节点，但是不能“忽略”数组中的节点。

我想要扩展当前的JSONComparator，使其包含一个Customization，该Customization的第一个“ path”参数具有数组地址。

JSONComparator customisedJobComparator = new CustomComparator(JSONCompareMode.NON_EXTENSIBLE,
            new Customization("id", (o1, o2) -> true),
            new Customization("appointmentBookedDate.$date", (o1, o2) -> true),
            ...
            new Customization("someArray[n].timestamp", (o1, o2) -> true) //<--- this is wrong, what is the correct way for this path address?
            );

下面的代码是我尝试证明解决方案的尝试；除了anArray []。id值外，两个预期/实际JSON字符串都相同。我希望此测试通过，但失败并出现错误：java.lang.AssertionError：anArray [0]找不到元素{“ id”：“ valueA”}的匹配项

@Test
public void compareJsonStrIgnoringDiffInArray() {
    String errorMsg = "";
    String expectedJsonStr = "{\"anArray\": [{\"id\": \"valueA\"}, {\"colour\": \"Blue\"}]}";
    String actualJsonStr = "{\"anArray\": [{\"id\": \"valueB\"}, {\"colour\": \"Blue\"}]}";

    //Create custom comparator which compares two json strings but ignores reporting any differences for anArray[n].id values
    //as they are a tolerated difference
    Customization customization = new Customization("anArray[n].id", (o1, o2) -> true);
    JSONComparator customisedComparator = new CustomComparator(JSONCompareMode.NON_EXTENSIBLE, customization);

    JSONAssert.assertEquals(errorMsg, expectedJsonStr, actualJsonStr, customisedComparator);
}

Answer 1

在深入研究JSONAssert的javadoc之后，我看到了一个使用对象数组的示例。从该示例中，我能够修改您的测试用例：

    @Test
    public void compareJsonStrIgnoringDiffInArray() throws JSONException {
        String errorMsg = "";
        String expectedJsonStr = "{\"anArray\": [{\"id\": \"valueA\"}, {\"colour\": \"Blue\"}]}";
        String actualJsonStr = "{\"anArray\": [{\"id\": \"valueB\"}, {\"colour\": \"Blue\"}]}";

        //Create custom comparator which compares two json strings but ignores reporting any differences for anArray[n].id values
        //as they are a tolerated difference

        ArrayValueMatcher<Object> arrValMatch = new ArrayValueMatcher<>(new CustomComparator(
                JSONCompareMode.NON_EXTENSIBLE,
                new Customization("anArray[*].id", (o1, o2) -> true)));

        Customization arrayValueMatchCustomization = new Customization("anArray", arrValMatch);
        CustomComparator customArrayValueComparator = new CustomComparator(
                JSONCompareMode.NON_EXTENSIBLE, 
                arrayValueMatchCustomization);
        JSONAssert.assertEquals(expectedJsonStr, actualJsonStr, customArrayValueComparator);
    }