(1/2)起因

由于 MediaType.APPLICATION_JSON_UTF8_VALUE 已经被废弃, 且推荐我们使用 MediaType.APPLICATION_JSON_VALUE , 理由是认为我们的浏览器都能自动分辨并解析 UTF-8 格式.

但现实是, 经过层层处理, 返回的响应被解析成 application/json;charset=iso-8859-1, 导致我们的文字都变成了问号 ?, 这明显是不行的.

网上有很多文章讲了如何设置默认为 UTF-8, 但都过于麻烦.

• 比如, 设置一个转换器

以下是设置一个转换器的代码

@Configuration
public class MyWebMvcConfig extends WebMvcConfigurationSupport {
	@Override
	 protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
	    for (HttpMessageConverter<?> converter : converters) {
	       // 解决controller返回普通文本中文乱码问题
	    if (converter instanceof StringHttpMessageConverter) {
	      ((StringHttpMessageConverter) converter).setDefaultCharset(StandardCharsets.UTF_8);
	       }
	       // 解决controller返回json对象中文乱码问题
	    if (converter instanceof MappingJackson2HttpMessageConverter) {
	      ((MappingJackson2HttpMessageConverter) converter).setDefaultCharset(StandardCharsets.UTF_8);
	    }
	  }
	}
 }

• 比如, 单独加在 @RequestMapping 上

@RequestMapping(value = "queryXXX", produces = "application/json;charset=UTF-8")

(2/2)解决办法

设置 force-response 为 true 就可以了

server:
  # port: 8080
  servlet:
    encoding:
      force-response: true
    session:
      # persistent: true # 是否在重启之间保存session
      timeout: 5m # 设置session过期时间, 最小时间依据容器的不同判定 Unlike Jetty and Undertow, Tomcat only supports minute precision for session timeout. Any value that is greater than zero is converted to minutes with a minimum of 1 minute # https://github.com/spring-projects/spring-boot/issues/7383

原理是将 charset 设为 UTF-8, 然后强制生效. 又因为 charset 默认值本就是 UTF-8, 所以只需设置其强制生效就行了.

server.servlet.encoding.charset=UTF-8 # charset 设为 UTF-8
server.servlet.encoding.force-response=true # respond 强制生效


来自官网
https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#application-properties.server.server.servlet.encoding.charset

网上还有一些是基于 springboot 1.x 的, 所以生效不了. ( Reference: https://docs.spring.io/spring-boot/docs/1.5.22.RELEASE/reference/html/common-application-properties.html )

# 这是基于 springboot 1.x 的
# Charset of HTTP requests and responses. Added to the "Content-Type" 
# header if not set explicitly.
spring.http.encoding.charset=UTF-8
# Enable http encoding support.
spring.http.encoding.enabled=true
# Force the encoding to the configured charset on HTTP requests and responses.
spring.http.encoding.force=true 

SpringMvc 文章

https://www.iteye.com/blog/elim-1753271 点击链接