SpringBoot中的消息转换器

抠脚学代码

已于 2023-04-20 09:38:27 修改

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于 2023-04-20 09:31:02 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_46236517/article/details/130258739

版权

文章目录

SpringBoot中消息转化器的作用
实现
参考

SpringBoot中消息转化器的作用

在整个数据流转过程中，前端的请求报文转化为Java对象，Java对象转化为响应报文，这里就用到了HttpMessageConverter（消息转换器）。用以解决数据的格式问题或者数据精度丢失的问题。

实现

package com.wj.reggie_take_out.config;

import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.StringSerializer;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.wj.reggie_take_out.interceptors.LoginInterceptor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.math.BigInteger;
import java.util.List;

/**
 * @Description: 静态资源映射
 * @Author WJ
 * @Date 2023/4/16:10:51
 * @Version V1.0
 **/
@Slf4j
@Configuration
public class MyWebMvcConfig extends WebMvcConfigurationSupport {
    /**
     * 静态资源路径映射
     * @param registry
     */
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("/front/**").addResourceLocations("classpath:/front/");
        log.info("开始静态资源映射");

    }

    /**
     * 拦截器
     * @param registry
     */
    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        //拦截所有请求
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/backend/page/login/login.html");
    }

    /**
     * 消息转换器
     * @param converters
     */
    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("消息转换器");
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class,ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE,ToStringSerializer.instance);

        objectMapper.registerModule(simpleModule);
        objectMapper.registerModule(new JavaTimeModule());
        messageConverter.setObjectMapper(objectMapper);
        converters.add(0,messageConverter);
    }
}