• 前臺AJAX傳送請求，請求json串，直接@responsebody返回json串會報錯 需要引入以下jar包
• 
• 如果是maven專案，直接pom中新增以下程式碼

<!-- json支援 -->
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20160810</version>
        </dependency
 
>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.5</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId
 
>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.5</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId
 
>
            <version>2.9.5</version>
        </dependency>