Struts+Ajax+Json

这两天在用ajax，之前一直没有怎么用过，现在写点东西，让自己记一下
//js端

var ar = new Array();
   jQuery.ajaxSetup({async:false});//关闭ajax的异步
    jQuery.get("ajax_postroad!getSelectRoad.action?random="+Math.random(),//发送，加随机ID，防止浏览器缓存
function(data){//回调函数
    var obj = eval ("(" + data + ")");//返回的json变成js可以用的
    var ob = new Object();//添加到对象中
         ob[classes[0]] = obj.ylmc;
         ob[classes[1]] = obj.yldh;
    ar.push(ob);//加到数组中
    });
   return ar;
//java端

 
//用来存放

private  String yldh = "";
private String ylmc = "";

public String getYldh() {
return yldh;
}

public void setYldh(String yldh) {
this.yldh = yldh;
}

public String getYlmc() {
return ylmc;
}

public void setYlmc(String ylmc) {
this.ylmc = ylmc;
}

public String getSelectRoad(){
HttpSession session = ServletActionContext.getRequest().getSession();
Map<String,PostRoad> map = (Map<String,PostRoad>)session.getAttribute("hasChecked");
    Set<String> key = map.keySet();
    yldh = "";
    ylmc = "";
        for (Iterator it = key.iterator(); it.hasNext();) {//map的遍历
            String s = (String) it.next();
            yldh += map.get(s).getN_yldh()+",";
            ylmc += map.get(s).getC_ylmc()+",";
        }
        yldh = yldh.substring(0,yldh.length()-1);
        ylmc = ylmc.substring(0,ylmc.length()-1);
return "yldh";
}

 
//xml配置

<package  name="JSON" extends="json-default" >
    <action name="ajax_postroad" class="com.copote.businessManage.action.road.PostRoadAction">
    <result name="yldh" type="json"/>
    </action>
    </package>