function save_active(){
	 $.ajax({
			url :'active_info',
			type : 'get',
			cache : false,<pre name="code" class="javascript">			dataType : "json",
			data  :{
				       
				ActivityName:document.getElementById("ActivityName").value,
				ActivityDate:document.getElementById("ActivityDate").value,
				ActivityNumber:document.getElementById("ActivityNumber").value,
				ActivityAddress:document.getElementById("ActivityAddress").value,
				ActivityDescrible:document.getElementById("ActivityDescrible").innerHTML,
				ActivityType:selectValue,
			}, 
	
 

</pre><pre name="code" class="javascript">

 我開始最初是將 HTML和servlet都設定字符集為“utf-8”：

HTML中：

<pre name="code" class="html"><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

servlet 中：

request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");

結果仍是亂碼
 

最後將ajax的傳參方式有get改為 post  就可以了