ajax 動態獲取數據庫中的值
阿新 • • 發佈：2018-06-02
on() click black .get solver 關閉連接 SQ system ppi
功能簡介： 在一個輸入框中輸入內容 ，當內容長度>1時向後發送ajax 從數據庫中獲取有關文本框中的內容在前臺顯示， 前臺設計一些點擊事件，以及jquery的應用
1 使用了springmvc 中的requestmapping註解 故 先附上 配置文件
web.xml配置:
<servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- Map all requests to the DispatcherServlet for handling --> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
springmvc.xml配置如下：
<!-- 配置自定掃描的包 --> <context:component-scan base-package="com.rl.util"></context:component-scan> <!-- 配置視圖解析器: 如何把 handler 方法返回值解析為實際的物理視圖 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/views/"></property> <property name="suffix" value=".jsp"></property> </bean>
前臺頁面如下:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style>
input[name]{
width:500px;
height: 20px;
align-self: center;
vertical-align:middel;
margin-left:300px;
}
#div1{
width: 500px;
height: 230px;
border: 1px solid black;
list-style:none;
margin-left:300px;
display: none;
}
.mouseOver{
background-color: red;
}
</style>
<script type="text/javascript" src="static/bootstrap/js/jquery.min.js" ></script>
</head>
<body>
<input id="sousuo" type="text" name="inputText" placeholder="請輸入" />
<input type="button" value="搜索" />
<br>
<div id="div1">
<li>北京</li>
<li>天?</li>
<li>上?</li>
</div>
<a href="ad">dasf</a>
</body>
<script>
$("#sousuo").focus();
$("#sousuo").blur(function(){
$("#div1").hide(1000);
})
$(document).ready(function(){
$("#sousuo").bind("keyup",function(){
var $inpu=$("#sousuo").val();
if($inpu.length>1){
//alert($inpu);
$.ajax({
async : false,
cache : false,
type : ‘POST‘,
url : ‘/ajax_jso/ad‘,
dataType : "json",
data : {"postData":$inpu},
error : function() {
alert(‘請求失敗 ‘);
},
success : function(data) {
/* */
$("li").text("");
for(var i=0;i<data.length;i++){
/* . */
var $li = $("<li></li>");
$li.text(data[i]);
$("#div1").append($li);
}
}
});
$("#div1").show(1000)
//setTimeout(,5000)
}
$("li").mouseover(function(){
$("li").removeClass();
$(this).addClass("mouseOver");
});
$("li").click(function(){
$("#sousuo").val($(this).text());
})
});
});
</script>
</html>
後臺接受請求的代碼如下：
package com.rl.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import net.sf.json.JSONArray;
@Controller
public class Control {
@RequestMapping("/ad")
@ResponseBody
public String getList(HttpServletRequest request) {
//HttpServletRequest request= ServletActionContext.getRequest();
List<String> list=new ArrayList<>();
Gson gson2 = new GsonBuilder().enableComplexMapKeySerialization().create();
try {
Class.forName("com.mysql.jdbc.Driver");// 導入驅動（jar包）
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
String name = "";
Connection conn = null;
try {
conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/xxff", "root", "123456");// 建立連接
} catch (SQLException e) {
e.printStackTrace();
}
// String sql = "select name,email,dob from student";//建立SQL語句
System.out.println( request.getParameter("postData"));
String postData = request.getParameter("postData");
if(postData==null){
System.out.println("null "+"postData");
}
else{
postData = postData.trim();
System.out.println("TrubleShooting.java timestap = "+postData);
String sql = "SELECT login_name FROM tab_account WHERE login_name LIKE ‘%"
+ ""
+postData+ "%‘";//where login_name like ‘%postData%‘
/*List<Map<String, String>> list = new ArrayList<>();
Map<String, String> map = new HashMap<>();
*/
try {
Statement stmt = (Statement) conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
// cursor
while (rs.next()) {
name = rs.getString(1);
//list.add(name);
/*
* String email = rs.getString(2); String dob = rs.getString(3);
*/
//System.out.println(name/* +" , "+email+" , "+dob */);
System.out.println(name);
//map.put("name", name);
list.add(name);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (conn != null)
try {
conn.close();// 關閉連接
} catch (SQLException e) {
e.printStackTrace();
}
}
}
String json=JSONArray.fromObject(list).toString();
JSONArray jsonArray = JSONArray.fromObject(json);
//List<String> list2 = (List) JSONArray.toCollection(jsonArray);
return json;
}
}
ajax 動態獲取數據庫中的值