ajax

//请求大学数据有ajax
var http_request = false;
function setProUnis(o){
    var url="setShowCoUnis?cid=";
    url+=o.coId;
    url+="&proId=";
    url+=o.id;
    CreateRequest(url);
}
function CreateRequest(url){
    http_request=false;
    //开始初始化XMLHttpRequest
    if(window.XMLHttpRequest){  //Mozilla浏览器
        http_request = new XMLHttpRequest();
        if(http_request.overrideMimeType){
            http_request.overrideMimeType("text/xml");
        }
    }else if(window.ActiveXObject){//IE
        try{
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
        }catch(e){
            try {
                http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {
                // TODO: handle exception
            }
        }
    }
    if(!http_request){//异——创建对象失败
        window.alert("不能创建XMLHttpRequest对象实例，请更新浏览器。")
        return false;
    }
    
    http_request.onreadystatechange = processRequest;
    //确定发送请求
    //window.alert(url);
    http_request.open("GET", url, true);
    http_request.send(null);
}

function processRequest(){
    
    if(http_request.readyState == 4){
        if(http_request.status == 200){
            //window.alert("statusText = "+http_request.responseText);
            document.getElementById("uniTbl").innerHTML=http_request.responseText;
        }else{
            window.alert("你请求的界面有异常");
        }
    }
}

上面是javascript的部分

下面的是servlet的部分

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        response.setContentType("text/xml");
        response.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();
        response.setContentType("text/xml;charset=utf-8");
        //ie禁用缓存
        response.setHeader("Cache-Control", "no-cache"); 
        
        
        String cId=request.getParameter("cid");
        String proId=request.getParameter("proId");
        System.out.println(cId +"  "+proId);
        //取出UniversityServiceInter
        WebApplicationContext wac=WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
        UniversityServiceInter usi=(UniversityServiceInter) wac.getBean("universityServiceImp");
        
        List list=usi.getObjectList("from University where proId=? and countryId=?", new Object[]{Integer.parseInt(proId),Integer.parseInt(cId)});
        
        
        
        String res = "<table width='100%'><tr>";
        
        for (int i = 0; i < list.size(); i++) {
            University u = (University) list.get(i);
            res+="<td><li>";
            res+="<a onclick='showMyUni(this)' href='javascript:void(0);' class='xh' id='"+u.getId()+"'> "+u.getName()+"</a></li></td>";
            if((i+1)%3==0){
                res+="</tr><tr>";
            }
        }
        res+="</tr></table>";
        System.out.println(res);
        out.write(res);
        out.flush();
        out.close();
    }