后台返回的List<E>数据如何让前台ComboBox显示

public String execute(){
SexService sexService = SexServiceFactory.getSexService();
List sexList = sexService.showSex();
StringBuilder sb = new StringBuilder();//构造json
sb.append("[");
if(sexList.size()>0)

{
for(Xtwh_Sex sex:sexList)//遍历 sexList
｛
sb.append("{\"id\": \"" + sex.getId() //对应store里面id属性
+ "\",\"name\": \"" + sex.getName()+"\ " //对应store里面id属性
｝
}
return sb;
}

获取到的json数据如下：｛id:"xxx",name:"xxxx"｝