把服务器端获得的map转换为string,然后在客户端再把string转换为map,最后用jquery读取map

服务器端代码为:
Map<String, String> product_names = DataManager.getGroup_names();
StringBuffer sb = new StringBuffer();
sb.append("{");
Set<String> keys = product_names.keySet();
for(Iterator<String> iter = keys.iterator();iter.hasNext();) {
String key = iter.next();
sb.append(product_names.get(key)+":");
sb.append("['"+key+"'],");
}
sb.deleteCharAt(sb.length()-1);
sb.append("}");
response.getWriter().write(sb.toString());
客户端代码:
$.ajax({
type:"post",
url:"InitData",
data:"",
success:function(data) {
var product_name = document.getElementById("product_name");
//alert("("+data+")");
var map =  eval("("+data+")");
$.each(map,function(key,values){
option = new Option(key,values);
product_name.options.add(option);
    /* alert(key);  
    $(values).each(function(){  
        alert(this);  
    });   */
}); 
}
    });