SpringBoot-01SpringBoot配置FastJson

一. SpringBoot自带JSON解析工具

 通过观察SpringBoot自动引入的jar包可以发现, SpringBoot其实自身已经携带JSON解析工具:Jackson. 如果不想使用Jackson而使用FastJson的话, 需要在SpringBoot中配置FastJson.

二. 步骤

1. 在pom.xml中引入FastJson依赖库

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

2. 配置FastJson(两种方式)

方式一:
 ① SpringBoot启动类继承WebMvcConfigurerAdapter
 ② 重写configureMessageConverters()方法

package online.bendou.springboot.fastjsondemo;import java.util.List;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.http.MediaType;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;/** * SpringBoot的启动类, 使用@SpringBootApplication修饰 * @author Lx *  * 继承WebMvcConfigurerAdapter, 重写 * */@SpringBootApplicationpublic class Application extends WebMvcConfigurerAdapter{    @Override    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {        super.configureMessageConverters(converters);        /*         * 1. 需要先定义一个convert转换器对象          * 2. 配置添加fastjson的配置信息, 比如: 是否要格式化返回的json数据;         * 3. 把配置信息添加到convert转换器对象中;         * 4. 解决中文乱码         * 5. 将convert添加到转换器对象当中;         */        // 1.        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();        // 2.        FastJsonConfig fastJsonConfig = new FastJsonConfig();        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);        // 3.        fastConverter.setFastJsonConfig(fastJsonConfig);        //4. 解决中文乱码问题         List<MediaType> fastMediaTypes = new ArrayList<MediaType>();        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);        fastConverter.setSupportedMediaTypes(fastMediaTypes);        // 5.        converters.add(fastConverter);    };    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }}

 ③ 在实体类中添加FastJson注解校验配置的FastJson是否生效

package online.bendou.springboot.fastjsondemo.entity;import java.util.Date;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import org.springframework.stereotype.Component;import com.alibaba.fastjson.annotation.JSONField;@Component@Entity(name="user_info")public class User {    @Id    @GeneratedValue(strategy=GenerationType.AUTO)    private Integer id;    private String name;    // 出生日期    @JSONField(format="yyyy-MM-dd")    private Date birthday;    get/set...  }

 ④ 编写Contoller

package online.bendou.springboot.fastjsondemo.controller;import java.util.Date;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import online.bendou.springboot.fastjsondemo.entity.User;@RestControllerpublic class FastJsonController {    @GetMapping("/user")    public Object findAll(){        User user = new User();        user.setId(1);        user.setName("张三");        user.setBirthday(new Date());        return user;    }}

 ⑤ 运行启动类, 浏览器访问测试

方式二:
  在Application.java启动类中注入Bean: HttpMessageConverters

package online.bendou.springboot.fastjsondemo;import java.util.ArrayList;import java.util.List;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.web.HttpMessageConverters;import org.springframework.context.annotation.Bean;import org.springframework.http.MediaType;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.web.bind.annotation.RestController;import com.alibaba.fastjson.serializer.SerializerFeature;import com.alibaba.fastjson.support.config.FastJsonConfig;import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;/** * 配置FastJson的方式二: *      在启动类中注入HttpMessageConverters * @author Lx * */@RestControllerpublic class Application {    @Bean    public HttpMessageConverters fastJsonHttpMessageConverters(){        // 1.创建一个converter对象        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();        // 2.创建配置对象        FastJsonConfig fastJsonConfig = new FastJsonConfig();        // 3.添加配置        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);        // 4.将配置添加到转换器对象中        fastConverter.setFastJsonConfig(fastJsonConfig);        // 5. 解决中文乱码问题        List<MediaType> mediaTypes = new ArrayList<MediaType>();        mediaTypes.add(MediaType.APPLICATION_JSON_UTF8);        fastConverter.setSupportedMediaTypes(mediaTypes);        // 6.将转换器对象转化为HttpMessageConverter对象        HttpMessageConverter<?> converter = fastConverter;        return new HttpMessageConverters(converter);    }    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }}