List collection turn json format

List collection turn json format

In springmvc json support frame conversion, the need to introduce jackson package, add the following code in pom.xml:

<dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.7</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.7</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.7</version>
        </dependency>

       //将list集合转成json字符串
       ObjectMapper objectMapper = new ObjectMapper();
       String json = objectMapper.writeValueAsString(list);