SpringMVC返回JSON格式数据

相关代码：

前提是你的springmvc其他配置已经ok的情况下

1.导入JSON相关依赖

<!--阿里的json包-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.78</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.8</version>
</dependency>

2.编写一个实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String address;
}

3.在springmvc-servlet.xml中加入此配置

为了处理JSON格式的中文乱码

    <mvc:annotation-driven>
        <!--JSON格式乱码处理方式-->
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg value="UTF-8"/>
            </bean>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
                        <property name="failOnEmptyBeans" value="false"/>
                    </bean>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

4.编写Controller

@Controller
public class JsonController {
    @GetMapping("/json")
    @ResponseBody
    public String json(){
        User user = new User(1,"齐菁菁","china");
        User user1 = new User(2,"詹三","china");
        User user2 = new User(3,"李四","china");
        List<User> list = Arrays.asList(user, user1, user2);
        return JSON.toJSONString(list);
    }
}

5.启动tomcat进行访问