後臺程式碼：

HttpServletResponse response = ServletActionContext.getResponse();

			response.setContentType("text/html;charset=utf-8");
			response.setCharacterEncoding("UTF-8");
			response.setHeader("Cache-Control", "no-cache");
			PrintWriter out = null;
			JSONArray mlist = JSONArray.fromObject(list); //有依賴jar包
			try {
				out = response.getWriter();
				out.print(mlist.toString());			
			} catch (IOException e) {
				e.printStackTrace();
			} finally {
				out.flush();
				out.close();
			}
 

JSONArray依賴jar包：

• commons-lang.jar

• commons-beanutils.jar

• commons-collections.jar

• commons-logging.jar 

• ezmorph.jar

• json-lib-2.2.2-jdk15.jar

如果還是報錯，看看包導的正確不正確。其中，commons-lang.jar 和 commons-lang3-3.2.jar是不一樣的

前臺程式碼：

$.ajax({ 
    type:"POST",		
    url:"accountAction!queryUMajor",	
    data:"deptId="+$("#deptId").val(),	
    dataType:"text",

    success:function(list){
	var majorList=eval("("+list+")");//處理，將json字串轉換為物件    
	$.each(majorList, function (i, item) { 
		alert(item.id + "," + item.name); 
	});	
    },
    error:function(err){
	alert(err);
    } 
});