解决SpringBoot中文乱码问题-亲测有效

1. 检查application.yml
   一般情况都是默认配置的UTF-8不需要自己配置，检查一下就好~

server:
  tomcat:
    uri-encoding: UTF-8
spring:
  http:
    encoding:
      charset: UTF-8
  messages:
    encoding: UTF-8

2. 添加配置类

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.nio.charset.Charset;
import java.util.List;

/**
 * 中文乱码解决
 */
@Configuration
public class CharsetConfig implements WebMvcConfigurer {

    @Bean
    public HttpMessageConverter<String> responseBodyConverter() {
        StringHttpMessageConverter converter = new StringHttpMessageConverter(
                Charset.forName("UTF-8"));
        return converter;
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(responseBodyConverter());
    }

    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.favorPathExtension(false);
    }
}