方式一：

配置檔案新增

banner.charset=UTF-8
server.tomcat.uri-encoding=UTF-8
spring.http.encoding.charset=UTF-8
spring.http.encoding.enabled=true
spring.http.encoding.force=true
spring.messages.encoding=UTF-8

方式二：

@RequestMapping(value = "test",produces="text/html;charset=UTF-8", method = RequestMethod.GET
 
)

方式三：

package com.example.demo.dataSourceConfig;

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.WebMvcConfigurerAdapter;

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

/**
 * @Description:
* @Author 羅曼蒂克
* @Date Created in 10:55   2018/6/6
 */
@Configuration
 
public class CustomMVCConfiguration extends WebMvcConfigurerAdapter {

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

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

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

設定檔案型別

將application.properites的檔案型別修改為UTF-8的編碼型別。

通過以上方法測試獲取出來的值還是亂碼。

· 解決辦法

設定 File Encodings的Transparent native-to-ascii conversion為true，具體步驟如下：依次點選

File -> Settings -> Editor -> File Encodings

將Properties Files (*.properties)下的Default encoding for properties files設定為UTF-8，將Transparent native-to-ascii conversion前的勾選上。