Java JsonPath函数 "indexOf"给出异常: Arguments to function: 'indexOf' are not closed properly

Question

我正在使用 Jayway JsonPath 库版本 2.4.0。在 jsonPath 中使用 indexOf 函数，例如。 $.values[?(@.num.indexOf('101') != -1)].id

它给出异常函数参数:'indexOf'未正确关闭。但在线 jsonPath 评估器上的效果相同

我在 https://jsonpath.com 上尝试了相同的 jsonPath 和 json 字符串。那里工作得很好。我尝试过一些混合和匹配(例如 $.values[?(@.num.indexOf("101") != -1)].id) (双引号而不是单引号)但还是一样。

public static void main(String[] args) {
        try {
        String jsonString ="{ \n" + 
                "   \"values\":[ \n" + 
                "      { \n" + 
                "         \"num\":[\"101\", \"102\"],\n" + 
                "         \"id\": \"a\"\n" + 
                "      },\n" + 
                "       { \n" + 
                "         \"num\":[\"104\", \"105\"],\n" + 
                "         \"id\": \"b\"\n" + 
                "      }\n" + 
                "   ]\n" + 
                "}";



        String jsonPath = "$.values[?(@.num.indexOf('101') != -1)].id";


        DocumentContext jsonContext = JsonPath.parse(jsonString);
        List<String> ans = null;
        ans = jsonContext.read(String.valueOf(jsonPath));
        System.out.println(ans);
        }catch(Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }

预期答案是“a”但它给出了异常(exception)。这是堆栈跟踪

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
com.jayway.jsonpath.InvalidPathException: Arguments to function: 'indexOf' are not closed properly.
    at com.jayway.jsonpath.internal.path.PathCompiler.parseFunctionParameters(PathCompiler.java:375)
    at com.jayway.jsonpath.internal.path.PathCompiler.readPropertyOrFunctionToken(PathCompiler.java:217)
    at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:151)
    at com.jayway.jsonpath.internal.path.PathCompiler.readDotToken(PathCompiler.java:171)
    at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:145)
    at com.jayway.jsonpath.internal.path.PathCompiler.readPropertyOrFunctionToken(PathCompiler.java:237)
    at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:151)
    at com.jayway.jsonpath.internal.path.PathCompiler.readDotToken(PathCompiler.java:171)
    at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:145)
    at com.jayway.jsonpath.internal.path.PathCompiler.readContextToken(PathCompiler.java:124)
    at com.jayway.jsonpath.internal.path.PathCompiler.compile(PathCompiler.java:58)
    at com.jayway.jsonpath.internal.path.PathCompiler.compile(PathCompiler.java:75)
    at com.jayway.jsonpath.internal.filter.ValueNodes$PathNode.<init>(ValueNodes.java:580)
    at com.jayway.jsonpath.internal.filter.ValueNode.createPathNode(ValueNode.java:208)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readPath(FilterCompiler.java:364)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readValueNode(FilterCompiler.java:96)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readExpression(FilterCompiler.java:190)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readLogicalANDOperand(FilterCompiler.java:186)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readLogicalAND(FilterCompiler.java:150)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readLogicalOR(FilterCompiler.java:132)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readLogicalANDOperand(FilterCompiler.java:181)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readLogicalAND(FilterCompiler.java:150)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.readLogicalOR(FilterCompiler.java:132)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.compile(FilterCompiler.java:78)
    at com.jayway.jsonpath.internal.filter.FilterCompiler.compile(FilterCompiler.java:54)
    at com.jayway.jsonpath.internal.path.PathCompiler.readFilterToken(PathCompiler.java:461)
    at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:141)
    at com.jayway.jsonpath.internal.path.PathCompiler.readPropertyOrFunctionToken(PathCompiler.java:237)
    at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:151)
    at com.jayway.jsonpath.internal.path.PathCompiler.readDotToken(PathCompiler.java:171)
    at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:145)
    at com.jayway.jsonpath.internal.path.PathCompiler.readContextToken(PathCompiler.java:124)
    at com.jayway.jsonpath.internal.path.PathCompiler.compile(PathCompiler.java:58)
    at com.jayway.jsonpath.internal.path.PathCompiler.compile(PathCompiler.java:75)
    at com.jayway.jsonpath.JsonPath.<init>(JsonPath.java:97)
    at com.jayway.jsonpath.JsonPath.compile(JsonPath.java:463)
    at com.jayway.jsonpath.internal.JsonContext.pathFromCache(JsonContext.java:222)
    at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:78)
    at Init.main(Init.java:32)
Arguments to function: 'indexOf' are not closed properly.

Answer 1

JsonPath 有多种实现。您的路径表达式与 Jayway 实现不兼容。我认为这是该实现中的一个错误。

所以你可以切换库，或者你可以将你的表达式更改为 Jayway 版本可以接受的内容。如果您更改此路径，您的代码应该会给出您期望的结果:

String jsonPath = "$.values[?('101' in @.num)].id";