本文实例为大家分享了ajax实现三级联动效果的具体代码，供大家参考，具体内容如下
1、html代码
<!DOCTYPE html>
<html>
<head>
< charset=\"UTF-8\">
< > </ >
<style type=\"text/css\">
.wrap
{
background-color: beige;
width: 400px;
height: 200px;
margin: 0 auto;
text-align: center;
margin-top: 200px;
}
.wrap select
{
width:130px;
height: 30px;
}
</style>
< type=\"text/ \" src=\"jquery-1.8.3.min.js\"></ >
</head>
<body>
<div class=\"wrap\">
<select id=\"province\">
</select>
<select id=\"city\">
</select>
</div>
< type=\"text/ \">
function getctiydata() {
$(\"#city\").empty();
var pid = $(\"#province\").val();
$.ajax({
url:\"/getCitys?pid=\"+pid,
dataType:\"json\"
}).done(function (data) {
for (var i in data)
{
$(\"#city\").append($(\"<option value=\'\"+ data[i].id +\"\'>\"
+ data[i].name +\"</option>\"))
}
})
}
$.ajax({
url: \"/getAllProvince\",
dataType:\"json\"
}).done(function (data) {
for (var i in data)
{
$(\"#province\").append($(\"<option value = \'\"+data[i].id+\"\'>\"
+ data[i].name +\"</option>\"))
}
getctiydata()
});
$(\"#province\").change(function () {
getctiydata()
})
</ >
</body>
</html>
2、javaservlet
package servlet;
import DButil.DataSourceUtil;
import com.alibaba.fastjson.JSON;
import domain.Province;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import javax.jws.WebService;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
@WebServlet(\"/getAllProvince\")
public class ProvinceServlet extends HttpServlet
{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
resp.setContentType(\"application/json;charset=utf8\");
QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());
String sql = \"select * from province\";
try
{
List<Province> provinces = queryRunner.query(sql, new BeanListHandler<Province>(Province.class));
json = JSON.toJSON(provinces);
resp.getWriter().print(json);
} catch (SQLException e)
{
e.printStackTrace();
}
}
}
package servlet;
import DButil.DataSourceUtil;
import com.alibaba.fastjson.JSON;
import domain.City;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import javax.jws.WebService;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
@WebServlet(\"/getCitys\")
public class CityServlet extends HttpServlet
{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
resp.setContentType(\"application/json;charset=utf8\");
QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());
String pid = req.getParameter(\"pid\");
String sql = \"select * from City where pid=?\";
try
{
List<City> cities = queryRunner.query(sql, new BeanListHandler<City>(City.class), pid);
toJSON = JSON.toJSON(cities);
resp.getWriter().print(toJSON);
} catch (SQLException e)
{
e.printStackTrace();
}
}
}
3、数据库池化
<? version=\"1.0\" encoding=\"UTF-8\"?> <c3p0-config> <default-config> <property name=\"driverClass\">com.mysql.jdbc.Driver</property> <property name=\"jdbcUrl\">jdbc:mysql://localhost:3306/text</property> <property name=\"user\">root</property> <property name=\"password\">root</property> <property name=\"acquireRetryAttempts\">0</property> </default-config> </c3p0-config>
以上就是省市联动的核心代码。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
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