本文实例讲述了JS请求servlet的方法。分享给大家供大家参考,具体如下:前端js代码://创建a
本文实例讲述了JS请求servlet的方法。分享给大家供大家参考,具体如下:
前端js代码:
//创建ajax请求对象
var xmlHttp;
function createXMLHttpRequest(){
if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}
}
/**
* 表单提交
*/
function submit(){
//发送请求
var searchContent = $id("search_input").value;//查找内容
createXMLHttpRequest();
try{
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.open("GET", "/MyMap/QueryMapServlet?searchName="+searchContent, true);
xmlHttp.send(null);
}catch(exception){
alert("您要访问的资源不存在!");
}
$("sideToggleRight").attr("checked","checked");//无作用
}
//处理结果
function handleStateChange(){
if(xmlHttp.readyState == 4){
if (xmlHttp.status == 200 || xmlHttp.status == 0){
var t = xmlHttp.responseText;
jsonobj = eval('('+t+')');
}
}
}
servlet端:
//oracle数据库查询的结果:
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection(url, "dio", "123");
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
rs = stmt.executeQuery("SELECT * FROM GEO where ST like '%"+searchName+"%'");
ResultSetMetaData metaData = rs.getMetaData();
rs.beforeFirst();//将指针移到最开始的位置
int columnCount = metaData.getColumnCount(); //列数
JSONArray array = new JSONArray();
while (rs.next()) {
JSONObject jsonObj = new JSONObject();
//输出数据
for (int i = 1; i <= columnCount; i++) {
String columnName = metaData.getColumnLabel(i);
String value = rs.getString(columnName);
jsonObj.put(columnName, value);
}
array.put(jsonObj);
}
System.out.println(array);
response.getWriter().print(array);
}
JS
请求
servlet