SpringBoot的Controller字符串响应乱码问题

1、实现思路

继承WebMvcConfigurationSupport类重写configureMessageConverters方法，自定义HttpMessageConverter并设置响应编码为UTF-8

2、示例代码

package com.xiaobai.conf;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.scheduling.concurrent.ConcurrentTaskExecutor;
import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

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

/**
 * 跨域配置
 */
@Configuration
public class CorsConfigurer extends WebMvcConfigurationSupport {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOriginPatterns("*")//允许跨域的域名，可以用*表示允许任何域名使用
                .allowedMethods("GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS")
                .allowCredentials(true)//带上cookie信息
                .maxAge(3600)//maxAge(3600)表明在3600秒内，不需要再发送预检验请求
                .allowedHeaders("*");
    }

    /**
     * 消息转换器设置
     * @param converters
     */
    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        converters.add(responseBodyConverter());

        addDefaultHttpMessageConverters(converters);
    }

    /**
     * 自定义HttpMessageConverter，设置响应编码为UTF-8
     * @return
     */
    @Bean
    public HttpMessageConverter<String> responseBodyConverter() {
        return new StringHttpMessageConverter(Charset.forName("UTF-8"));
    }
}