springboot使用@ResponseBody返回字符串乱码——解决

在Java配置类文件中加入以下代码即可解决：

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.WebMvcConfigurationSupport;

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

@Configuration
public class WebConfig extends WebMvcConfigurationSupport {
    
    @Override
    protected void extendMessageConverters(List> converters) {
        // 解决controller返回字符串中文乱码问题
        for (HttpMessageConverter converter : converters) {
            if (converter instanceof StringHttpMessageConverter) {
                ((StringHttpMessageConverter)converter).setDefaultCharset(StandardCharsets.UTF_8);
            }
        }
    }

}