spring boot2 修改默认json解析器Jackson为fastjson

旧城等待， 2022-12-02 00:55 194阅读 0赞

为什么要修改，转化出错，某些情况下转为后的json为空

引入依赖

maven

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
    </dependency>

gradle

implementation ('org.springframework.boot:spring-boot-starter-web') {
            exclude group: 'com.fasterxml.jackson.core', module: 'jackson-databind'
        }
        implementation 'com.google.code.gson:gson:2.8.6'

代码

package com.futve.example.configure;
    
    import com.google.gson.Gson;
    import com.google.gson.GsonBuilder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.converter.json.GsonHttpMessageConverter;
    
    import java.lang.reflect.Modifier;
    
    @Configuration
    public class GsonConfig {
        @Bean
        //自己提供一个GsonHttpMessageConverter的实例
        GsonHttpMessageConverter gsonHttpMessageConverter(){
            GsonHttpMessageConverter converter = new GsonHttpMessageConverter();
            GsonBuilder builder = new GsonBuilder();
            //设置Gson解析时日期的格式
            builder.setDateFormat("yyyy-MM-dd");
            //设置Gson解析时修饰符为protected的字段被过滤掉
            builder.excludeFieldsWithModifiers(Modifier.PROTECTED);
            //创建Gson对象放入GsonHttpMessageConverter的实例中并返回converter
            Gson gson = builder.create();
            converter.setGson(gson);
            return converter;
        }
    }

转换工具

package com.futve.example.tool;
    
    import com.google.gson.Gson;
    
    
    /**
     * 基于Gson封装的jsonUtil
     *
     * @author chenye
     * @date 2020-0828
     * implementation 'com.google.code.gson:gson:2.8.6'
     */
    public class GsonUtil {
        private static Gson gson = null;
    
        static {
            if (gson == null) {
                gson = new Gson();
            }
        }
    
        private GsonUtil() {
        }
    
        /**
         * 对象转成json
         */
        public static String objectToJson(Object object) {
            String json = null;
            if (gson != null) {
                json = gson.toJson(object);
            }
            return json;
        }
    
        /**
         * Json转成对象
         */
        public static <T> T gsonToBean(String json, Class<T> cls) {
            T t = null;
            if (gson != null) {
                t = gson.fromJson(json, cls);
            }
            return t;
        }
    
    
    }