Spring MVC的Post请求参数中文乱码解决方法

【转】：http://www.cnblogs.com/frankyou/p/7097468.html

在项目中的web-inf/web.xml中配置Filter:

 <filter>    
   <filter-name>encodingFilter</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> <async-supported>true</async-supported> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

关于这段配置需要强调两点：

• web.xml中，这段配置要放在所有filter的最前面，否则会不生效，根本原因请见上述第三点的解释。
• 两个初始化参数的作用，其实看这个Filter的源码就一目了然，这两个参数是用来决定是否要设置request和response中的编码。源码很简洁：

   public class CharacterEncodingFilter extends OncePerRequestFilter { private String encoding; private boolean forceEncoding = false; public CharacterEncodingFilter() { } public void setEncoding(String encoding) { this.encoding = encoding; } public void setForceEncoding(boolean forceEncoding) { this.forceEncoding = forceEncoding; } 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); } }