返回给前端的json，long转string

全栈程序员-站长 • 2022年5月14日下午9:40 • 未分类 • 阅读 63

大家好，又见面了，我是你们的朋友全栈君。

package com.zhidianfan.ydusermanager.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.web.PageableHandlerMethodArgumentResolver;
import org.springframework.http.converter.ByteArrayHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.ResourceHttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

/** * @Author sherry * @Description * @Date Create in 2019-03-15 * @Modified By: */
@Configuration
public class WebConfig extends WebMvcConfigurationSupport { 
   

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 
   
        converters.add(new ByteArrayHttpMessageConverter());
        converters.add(new StringHttpMessageConverter());
        converters.add(new ResourceHttpMessageConverter());
        converters.add(new AllEncompassingFormHttpMessageConverter());
        converters.add(new StringHttpMessageConverter());
        converters.add(longToStringConverter());
    }

    /** * 将返回给前端的Long和long，统一转化成字符串 * * @return */
    @Bean
    public MappingJackson2HttpMessageConverter longToStringConverter() { 
   
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        ObjectMapper mapper = new ObjectMapper();
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);//Long
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);//long
        mapper.registerModule(simpleModule);
        converter.setObjectMapper(mapper);
        return converter;
    }

    /** * 必须加上，否则Controller中的分页参数对象无法实例化 * * @param argumentResolvers */
    @Override
    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) { 
   
        // 注册Spring data jpa pageable的参数分解器
        argumentResolvers.add(new PageableHandlerMethodArgumentResolver());
    }
}