json若是不在pom中添加依賴會拋出500異常

因此必須添加如下依賴:html <!--jackson相關依賴--> <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>ja

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