json若是不在pom中添加依赖会抛出500异常

因此必须添加如下依赖:html <!--jackson相关依赖--> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>ja

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