服务器端获得要查询的东西,查询数据库,将查询的信息,以json字符串的形式返回给浏览器
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws servletexception,IOException {
String departmentID=request.getParameter("departmentID");
DataBaseHandle dataBaseHandle=new DataBaseHandle("commonUser","common","jdbc:MysqL://127.0.0.1:3306/firstwebsite");
String sql="select * from speciality where departmentID='"+departmentID+"'";
String json="{'specialities':[";
response.setContentType("text/html; charset=utf-8");
response.setCharacterEncoding("UTF-8");
try {
ResultSet rs=dataBaseHandle.exeutesql(sql);
while(rs.next())
{
json=json+"{'"+"specialityID':'"+rs.getString(1)+"',"+"'SPname':'"+rs.getString(2)+"'},";
System.out.println(rs.getString(1)+rs.getString(2));
}
json=json.substring(0,json.length()-1);
json=json+"]}";
PrintWriter pwriter=response.getWriter();
pwriter.print(json);
rs.close();
dataBaseHandle.closeResourse();
} catch (sqlException e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
}
js解析json,获得返回的内容
function updateSpeciality(str) {
var xmlhttp;
if (str=="")
{
alert("请选择非空的值!");
return;
}
if (window.XMLHttpRequest)
{// code for IE7+,Firefox,Chrome,Opera,Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6,IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var dataObj=eval("("+xmlhttp.responseText+")");//转换为json对象
for(var o in dataObj.specialities)
{
alert(dataObj.specialities[o].specialityID);
alert(dataObj.specialities[o].SPname);
}
}
}
xmlhttp.open("GET","/First/servlet/GetMessage?departmentID="+str,true);
xmlhttp.send();
}
原文地址:https://www.jb51.cc/ajax/163057.html
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。