相关知识回顾

jquery采用utf-8发送数据，看下v1.2.6中处理编码的代码

	// Serialize an array of form elements or a set of
	// key/values into a query string
	param: function( a ) {
		var s = [ ];

		function add( key,value ){
			s[ s.length ] = encodeURIComponent(key) + '=' + encodeURIComponent(value);
		};

		// If an array was passed in,assume that it is an array
		// of form elements
		if ( a.constructor == Array || a.jquery )
			// Serialize the form elements
			jQuery.each( a,function(){
				add( this.name,this.value );
			});

		// Otherwise,assume that it's an object of key/value pairs
		else
			// Serialize the key/values
			for ( var j in a )
				// If the value is an array then the key names need to be repeated
				if ( a[j] && a[j].constructor == Array )
					jQuery.each( a[j],function(){
						add( j,this );
					});
				else
					add( j,jQuery.isFunction(a[j]) ? a[j]() : a[j] );

		// Return the resulting serialization
		return s.join("&").replace(/%20/g,"+");
	}

方案一，解码全部使用utf-8编码。（这个国内一般不会如此处理）

方案二，过滤器针对ajax部分解码采用utf-8进行转码，其余部分仍用GBK。

方案2.1 前台传递编码方式utf-8. (注意，千万不要通过parameter传递，对于tomcat、tongweb等中间件只会转码一次)

       var xhr = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
       xhr.setRequestHeader("charset","utf-8");

String charset = servletRequest.getHeader("charset");

if (this.xmlHttpCharacterEncoding != null
		&& "XMLHttpRequest".equalsIgnoreCase(request
				.getHeader("x-requested-with"))) {
	request.setCharacterEncoding(this.xmlHttpCharacterEncoding);
} else if (characterEncoding != null) {
	request.setCharacterEncoding(characterEncoding);
}