SpringMVC返回字符串中文乱码

@ResponseBody @RequestMapping(value = "/save") public String callSomeone() { return "保存成功"; }
显示乱码
设置了CharacterEncodingFilter为UTF-8，
方法一：
指定RequestMapping的produces属性
@RequestMapping(value = "/addOrder",produces = "text/html;charset=utf-8")
    public String addOrder(){
        Order order = new Order(100,"连衣裙",8);
        orderService.addOrder(order);
        return "增加订单成功";
    }
方法二：
SpringMVC返回字符串的编码与StringHttpMessageConverter的DefaultCharset属性有关
修改StringHttpMessageConverter的DefaultCharset属性
新建一个工具类 AppUtil实现ApplicationContextAware接口，并监听ContextRefreshedEvent事件

@Component public class AppUtil implements ApplicationContextAware, ApplicationListener<ContextRefreshedEvent> { private ApplicationContext app; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.app = applicationContext; } @Override public void onApplicationEvent(ContextRefreshedEvent event) { try { RequestMappingHandlerAdapter requestMappingHandlerAdapter = app.getBean(RequestMappingHandlerAdapter.class); if(requestMappingHandlerAdapter!=null) { List<HttpMessageConverter<?>> messageConverters = requestMappingHandlerAdapter.getMessageConverters(); if(messageConverters!=null) { // 获取bean容器中的StringHttpMessageConverter，并修改DefaultCharset属性 for(HttpMessageConverter item : messageConverters) { if(item instanceof StringHttpMessageConverter) { ((StringHttpMessageConverter) item).setDefaultCharset(StandardCharsets.UTF_8); } } } } }catch (BeansException e) { } } }

<bean id="mappingJackson2HttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>
设置返回json数据的编码为UTF-8。