Java JsonPath 函数"indexOf"给出异常：函数的参数：'indexOf'未正确关闭

Question

使用jayway jsonpath库版本2.4.0。在JSONPATH中使用索引函数，例如。$.values[?(@.num.indexOf('101') != -1)].id

它给出了例外Arguments to function: 'indexOf' are not closed properly.，但在线JSONPATH评估员上也是如此的作品

我尝试了同一JSONPATH＆amp;https://jsonpath.com上的JSON字符串。那里正常工作。我尝试了一些混音＆amp;匹配(例如 $.values[?(@.num.indexOf("101") != -1)].id((双引号而不是单引号(，但仍然相同。

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());
        }
    }

预期的答案是"a"但这给出了例外。这是stacktrace

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

那里有许多实现的JSONPATH。您的路径表达式与Jayway实施不兼容。我认为这是该实现的错误。

因此，您可以切换库，也可以将表达式更改为Jayway版本可以使用的内容。如果您改变了这一路径，您的代码应该给您期望的结果：

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