Question

我正在解析json并验证数组长度，如下所示

from("direct:parseJson")
        .setHeader("numberOfBooks").jsonpath("$..books.length()", int.class)
        .choice()
                .when( simple("${header.numberOfBooks} == '1'"))
                         .log("One book")
                 .otherwise()
                         .log("multiple");

以上代码有效，但我正在寻找可以避免第二行的选项下面

 .when( simple("${jsonpath(' $..books.length() ', int.class)} == 1") )

其抛出错误

Caused by:
org.apache.camel.language.simple.types.SimpleIllegalSyntaxException:
Unknown function: jsonpath(' $..books.length() ', int.class) == 1 at
location 0
${jsonpath(' $..books.length() ', int.class)} == 1

第二次尝试我将标头设置为常数以验证简单表达式是否有效

.when().jsonpath("$..books.length() > ${header.numberOfBooks}")

Caused by: com.jayway.jsonpath.InvalidPathException: Could not parse token starting at position 18
        at com.jayway.jsonpath.internal.path.PathCompiler.fail(PathCompiler.java:616) ~[json-path-2.4.0.jar:2.4.0]
        at com.jayway.jsonpath.internal.path.PathCompiler.readNextToken(PathCompiler.java:152) ~[json-path-2.4.0.jar:2.4.0]

Answer 1

您可以直接在when子句中使用jsonPath，如camel documentation中所述。您的代码如下所示：

from("direct:parseJson")
        .choice()
        .when().jsonpath("$..books.length() == '1'")
                 .log("One book")
             .otherwise()
                 .log("multiple");

Jsonpath数组长度验证问题

1 个答案: