java - CharacterEncodingFilter 类

Question

使用org.springframework.web.filter.CharacterEncodingFilter配置请求编码方式，使用@RequestBody接受ajax的application/json；charset=utf-8 传输中文乱码，配置如下

<filter>  
       <filter-name>springUtf8Encoding</filter-name>  
       <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
       <init-param>  
           <param-name>encoding</param-name>  
           <param-value>UTF-8</param-value>  
       </init-param>  
       <init-param>  
           <param-name>forceEncoding</param-name>  
           <param-value>true</param-value>  
       </init-param>   
    </filter>  
    <filter-mapping>  
       <filter-name>springUtf8Encoding</filter-name>  
       <url-pattern>/*</url-pattern>  
   </filter-mapping> 

疑问：使用String data = URLEncoding.encode('数据',ISO-8859-1);
再URLDecode.decode(data,utf-8);即可得到正确的中文数据，我理解为tomcat将请求按照默认的编码ISO-8859-1来解析了，确实我也没有设置tomcat的默认编码格式，但是我同个项目的其它非ajax请求中文正常，猜测可能是CharacterEncodingFilter配置的没有拦截到我的请求，前辈帮忙看看哪里配置错了。还有个问题就是tomcat设置的默认编码类型和CharacterEncodingFilter设置的编码类型，是否有优先级的说法？

Answer 1

@RequestBody 既然使用到这个注解，那就说明楼主使用的不是get方法。参数不在URL中那自然是不需要使用URLEncoding.encodeYes.

<init-param>  
   <param-name>encoding</param-name>  
   <param-value>UTF-8</param-value>  
</init-param>  

It is enough that you set the encoding here.

---

@Override
protected void doFilterInternal(
        HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
        throws ServletException, IOException {

    if (this.encoding != null && (this.forceEncoding || request.getCharacterEncoding() == null)) {
        request.setCharacterEncoding(this.encoding);
        if (this.forceEncoding) {
            response.setCharacterEncoding(this.encoding);
        }
    }
    filterChain.doFilter(request, response);
}

forceEncoding 为 true 为设置response的编码，并不会对requestParameters have an impact.

The host please take a closer look at the order of execution. CharacterEncodingFilter执行的过程，以及Filter