SpringBoot学习-(2)使用FastJson作为json解析器

悠悠 2022-06-02 12:16 181阅读 0赞

前面一篇[SpringBoot学习-(1)第一个小例子][SpringBoot_-_1]  
作为springboot的helloworld介绍了springboot的基本配置和使用效果（如果没有接触过springboot的小伙伴看到该篇博文，建议从第一篇开始跟着笔者一起学习，后面的）。  
springboot可以直接将对象解析为json格式并返回数据。springboot使用了jackson作为json解析器。  
![这里写图片描述][SouthEast]

alibaba开源的FastJson是一个被广泛使用的json解析器，所以很多人习惯用FastJson，而不是jackson，那么又想使用springboot怎么办呢？

# 1.添加FastJson依赖包 #

<dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.15</version>
            </dependency>

# 2.配置基本信息 #

UserInfo  
这里使用FastJson的@JSONField(format=”yyyy-MM-dd HH:mm”)对Date类型进行格式话。

package com.tang.bean;
    
    import java.util.Date;
    
    import com.alibaba.fastjson.annotation.JSONField;
    
    public class UserInfo { 
    
        private Integer id;
        private String userName;
        private String loginName;
        private String password;
        private Integer age;
    
        @JSONField(format="yyyy-MM-dd HH:mm")
        private Date birthDate;
    
        public Integer getId() {
            return id;
        }
        public void setId(Integer id) {
            this.id = id;
        }
        public String getUserName() {
            return userName;
        }
        public void setUserName(String userName) {
            this.userName = userName;
        }
        public String getLoginName() {
            return loginName;
        }
        public void setLoginName(String loginName) {
            this.loginName = loginName;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
        public Integer getAge() {
            return age;
        }
        public void setAge(Integer age) {
            this.age = age;
        }
        public Date getBirthDate() {
            return birthDate;
        }
        public void setBirthDate(Date birthDate) {
            this.birthDate = birthDate;
        }
        @Override
        public String toString() {
            return "UserInfo [id=" + id + ", userName=" + userName + ", loginName="
                    + loginName + ", password=" + password + ", age=" + age
                    + ", birthDate=" + birthDate + "]";
        }
    
    
    }

UserInfoController

package com.tang.controller;
    
    import java.util.Date;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.tang.bean.UserInfo;
    
    /** * 这里的@RestController相当于@Controller+@ResponseBody * @author Tang */
    @RestController
    public class UserInfoController { 
    
        @RequestMapping("/getUser")
        public UserInfo getUserInfo(){
            UserInfo userInfo = new UserInfo();
            userInfo.setId(1);
            userInfo.setUserName("张三");
            userInfo.setLoginName("zhangsan");
            userInfo.setPassword("123456");
            userInfo.setAge(12);
            userInfo.setBirthDate(new Date());
            return userInfo;
        }
    }

启动类App

package com.tang;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class App { 
    
        public static void main(String[] args) {
            SpringApplication.run(App.class, args);
        }
    }

# 3.配置converters #

对App启动类进行处理  
1）启动类继承WebMvcConfigurerAdapter  
2）重写configureMessageConverters方法

package com.tang;
    
    import java.util.List;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.http.converter.HttpMessageConverter;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    
    import com.alibaba.fastjson.serializer.SerializerFeature;
    import com.alibaba.fastjson.support.config.FastJsonConfig;
    import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
    
    @SpringBootApplication
    public class App extends WebMvcConfigurerAdapter{ 
    
        public static void main(String[] args) {
            SpringApplication.run(App.class, args);
        }
    
    
        @Override
        public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
            super.configureMessageConverters(converters);
    
            //1.定义一个消息转换对象convert
            FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
    
            //2.添加fastJson配置信息，是否需要格式化
            FastJsonConfig fastJsonConfig = new FastJsonConfig();
            fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
    
            //3.在convert添加配置信息
            fastConverter.setFastJsonConfig(fastJsonConfig);
    
            //4.将convert添加到converters中
            converters.add(fastConverter);
        }
    }

或者使用@Bean注解配置，如下：

package com.tang;
    
    import java.util.List;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
    import org.springframework.context.annotation.Bean;
    import org.springframework.http.converter.HttpMessageConverter;
    
    import com.alibaba.fastjson.serializer.SerializerFeature;
    import com.alibaba.fastjson.support.config.FastJsonConfig;
    import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
    
    @SpringBootApplication
    public class App{ 
    
        public static void main(String[] args) {
            SpringApplication.run(App2.class, args);
        }
    
        /** * 通过@Bean注解 * @return */
        @Bean
        public HttpMessageConverters fastJsonHttpMessageConverters() {
    
            //1.定义一个消息转换对象convert
            FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
    
            //2.添加fastJson配置信息，是否需要格式化
            FastJsonConfig fastJsonConfig = new FastJsonConfig();
            fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
    
            //3.在convert添加配置信息
            fastConverter.setFastJsonConfig(fastJsonConfig);
    
            //4.将convert添加到converters中
            HttpMessageConverter<?> converter = fastConverter;
            return new HttpMessageConverters(converter);
        }
    
    }

# 4.测试 #

![这里写图片描述][SouthEast 1]

fastjson已经起作用

[SpringBoot_-_1]: http://blog.csdn.net/jinjin603/article/details/79046599
[SouthEast]: /images/20220602/402f1b46463b488bb0a0035c1f9dd4d0.png
[SouthEast 1]: /images/20220602/858f7d83b3fd45bda0cc3f6e2513590e.png