Pom配置FastJson

首先去掉本来自带的jackson，再加上FastJson依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-json</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.79</version>
        </dependency>

测试类

User实体类：

public class User {
    private String username;
    private Date birthday;
    Get set方法省略

UserController类：

@RestController
public class UserController {
    @GetMapping("/user")
    public User getuser(){
        User user = new User();
        user.setUsername("dong");
        user.setBirthday(new Date());
        return user;
    }
}

全局配置

• 编写config类，配置FastJson

@Configuration
public class WebMvcconfig {
    @Bean
    FastJsonHttpMessageConverter getconvers(){
        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
        FastJsonConfig jsonConfig = new FastJsonConfig();
        jsonConfig.setCharset(Charset.forName("UTF-8"));
        jsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
        converter.setFastJsonConfig(jsonConfig);
        converter.setDefaultCharset(Charset.forName("Utf-8"));
        return converter;
    }
}

• 实现WebMvcConfigurer接口中的方法配置FastJson

@Configuration
public class WebMvcconfig implements WebMvcConfigurer {
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
        FastJsonConfig jsonConfig = new FastJsonConfig();
        jsonConfig.setCharset(Charset.forName("UTF-8"));
        jsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
        converter.setFastJsonConfig(jsonConfig);
        converter.setDefaultCharset(Charset.forName("Utf-8"));
        converters.add(converter);
    }
    
}