求助。Ajax “请求的页面有异常” - Web 开发 / Ajax
代码如下:
JSP:
function doAjax(){ 按钮点击，触发此方法
var url = "<%=path%>/caseServlet.do?op=doAjax"; //调用servlet
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
}else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req){
req.open("GET",url, true);
req.onreadystatechange = checkcontent;
req.send(null);
}
}
function checkcontent(){
alert(req.readyState);
alert(req.status);
if (req.readyState == 4 && req.status == 200) { // 判断对象状态
// 信息已经成功返回，开始处理信息
if(req.responseText != ""){
var arrResult = req.responseText.split("@@@"); //拼接字符串间隔是"@@@"
alert(req.responseText);
document.getElementById('posBp').innerText=arrResult[2]; //把返回值放入指定位置
}
else{
alert('There was a problem with the request.');
}
}
else {//页面不正常
alert("您所请求的页面有异常。");
}
}
Servlet:
protected void doAjax(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
HttpSession session=request.getSession();
if(session.getAttribute("sn")!=null){
RiskBean riskBean=CaseDAO.selectRiskBean(Long.parseLong(session.getAttribute("sn").toString()), "IVCD");
PrintWriter pw=response.getWriter();
StringBuffer sb=new StringBuffer();
String posreduMin=Float.toString(riskBean.getRiskReduMin());
String reduMax=Float.toString(riskBean.getRiskReduMax());
sb.append(reduMin); sb.append("@@@");
sb.append(reduMax);
pw.write(sb.toString());
pw.close();
}
}
问题：
alert(req.status); 输出为404，
求指教。
[解决办法]
404页面不存在，你看看最后连接成的URL地址对不对
