Java语言实现通过Ajax抓取后台数据及图片
1.Java语言实现通过Ajax抓取后台数据及图片信息
1.1数据库设计：
create table picture( pic_id number not null, pic_name varchar(200)not null, pic_url varchar2(200) not null, pic_descp varchar2(200) not null, pic_price varchar2(200) not null ) insert into picture values(1 ,'小米5s Plus','img/1.png','5.7英寸大屏双摄手机，拍照黑科技' ,'79元'); insert into picture values(2 ,'红米手机4','img/2.png','12月27日早10点开售' ,'699元起'); insert into picture values(3 ,'小米电视3s 48英寸','img/3.png','原装液晶屏，金属机身' ,'1999元'); insert into picture values(4 ,'小米平板2 16GB现货','img/4.png','轻薄全金属，海量内容' ,'999元'); insert into picture values(5 ,'小米盒子3s','img/5.png','人工智能机顶盒，2GB+8GB 大存储' ,'299元'); insert into picture values(6 ,'小米移动电源2','img/6.png','双向快充，高密度锂聚合物电芯' ,'79元'); insert into picture values(7 ,'米家扫地机器人','img/7.png','远程智能控制，扫得干净扫得快' ,'1699元'); insert into picture values(8 ,'米家恒温电水壶','img/8.png','快速沸腾，水温智能控制' ,'299元'); insert into picture values(9 ,'小米净水器 厨上式','img/9.png','RO反渗透直出纯净水' ,'1299元'); insert into picture values(10 ,'小米手环 2','img/10.png','OLED 显示屏幕，升级计步算法' ,'149元'); select * from picture;
运行效果：
1.2 新建一个JavaWeb项目
1.2.1 添加项目说需要的包 即连接数据库的ojdbc的jar包
1.2.2编写连接数据库的工具类
package org.user.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class DBUtil { private static String driver="oracle.jdbc.driver.OracleDriver"; private static String url="jdbc:oracle:thin:@localhost:1521:orcl"; private static String user="yongl"; private static String passwd="121314"; public static Connection getConnection() { try { Class.forName(driver); return DriverManager.getConnection(url, user, passwd); } catch (Exception e) { e.printStackTrace(); return null; } } public static void closeConn(Connection conn,Statement stm , ResultSet rs ) { if(stm!=null){ try { stm.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } if(rs!=null){ try{ rs.close(); }catch(SQLException e){ e.printStackTrace(); } } } public static void main(String[] args) { System.out.println(getConnection()); } }
运行效果：
连接成功。
1.2.3编写字符串转化为json的的工具类
package org.picture.util; import com.google.gson.Gson; import com.google.gson.GsonBuilder; public class GsonUtil { public static String toJson(Object obj){ return new Gson().toJson(obj); } public static String toJson(Object obj, String dateFormat){ GsonBuilder builder = new GsonBuilder(); Gson gson = builder.setDateFormat("yyyy-MM-dd").create(); return gson.toJson(obj); } }
1.2.4 编写实体类
package org.picture.entity; public class Entity { private int id; private String name; private String url; private String descp; private String price; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getDescp() { return descp; } public void setDescp(String descp) { this.descp = descp; } public String getPrice() { return price; } public void setPrice(String price) { this.price = price; } @Override public String toString() { return "Entity [id=" + id + ", name=" + name + ", url=" + url + ", descp=" + descp + ", price=" + price + "]"; } }
1.2.5 编写dao方法
package org.picture.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import org.junit.Test; import org.picture.entity.Entity; import org.picture.util.DBUtil; public class Dao { //查询所有picture的所有信息 public List<Entity> findPicture(){ String sql="select * from picture"; Connection conn = DBUtil.getConnection(); ResultSet rs= null; PreparedStatement ps=null; List<Entity> list = new ArrayList<Entity>(); try { ps = conn.prepareStatement(sql); rs=ps.executeQuery(); while(rs.next()){ Entity p= new Entity(); p.setId(rs.getInt(1)); p.setName(rs.getString(2)); p.setUrl(rs.getString(3)); p.setDescp(rs.getString(4)); p.setPrice(rs.getString(5)); list.add(p); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { DBUtil.closeConn(conn, ps, rs); } return list; } @Test public void test(){ Dao dao = new Dao(); List<Entity> i=dao.findPicture(); for (Entity e : i) { System.out.println(e); } } }
运行效果：
1.2.6 编写servlet
package org.picture.servlet; import java.io.IOException; import java.util.List; 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 org.picture.dao.Dao; import org.picture.entity.Entity; import com.google.gson.Gson; @WebServlet("/pictureServlet") public class PictureServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Dao dao = new Dao(); List<Entity> i=dao.findPicture(); Gson gson = new Gson(); //在这里转化成json String json =gson.toJson(i); System.out.println(json); response.setContentType("application/json;charset=UTF-8"); response.getWriter().println(json); } }
运行效果：
在返回的是json 最终要返回到页面
1.2.7 html页面：
示例代码：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="js/jquery-1.9.1.min.js"></script> <style type="text/css"> #book { width: 100%; position: absolute; border:1px red solid; display:inline-block; } .p1{ font-size: 16px; color: #000; font-family: Microsoft YaHei; } .p2{ font-size: 14px; color: #b0b0b0; margin-top:10px; font-family: Microsoft YaHei; } .p3{ font-size: 16px; color: #ff5f19; margin-top:10px; font-family: Microsoft YaHei; } .product{ float:left; text-align: center; width:19%; position: relative; margin: 30px 20px 5px 50px; box-shadow: 0px 10px 10px #adadad; height: 330px; background: #fafafa; } .book-img{ width:100%; height:67%; margin: 0 0 8px 0; } .book-img img{ width:100%; height:100%; } </style> <script> //页面加载 获取全部信息 $(function(){ $.get("pictureServlet",function(result){ //result数据添加到表格中; addBox(result); }); }); function addBox(result){ //result是一个集合,所以需要先遍历 $.each(result,function(index,obj){ $("#picture").append("<div class='product'>"+//获得图片地址 "<div class='book-img'><img src="+obj.url+"></div>"+ //获得商品名字 "<div class='p1'>"+obj.name+"</div>"+ //获得商品描述 "<div class='p2'>"+obj.descp+"</div>"+ //获得商品价格 "<div class='p3'>"+obj.price+"</div>"+ "</div>"); }); } </script> </head> <body> <!-- 构建装一个容器 --> <div id="picture"> </div> </body> </html>
运行效果：
1.2.8在手机端运行
示例代码：
<!DOCTYPE html>
<html>
<head> <meta charset="UTF-8"> <title>Insert title here</title> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> <script type="text/javascript" src="js/jquery-1.9.1.min.js"></script> <style type="text/css"> .p1{ font-size: 14px; color: #000; } .p2{ font-size: 12px; color: #b0b0b0; } .p3{ font-size: 14px; color: #ff5f19; } .product{ width:100%; position: relative; margin: 20px 0 5px 0; height: 100px; background: #fafafa; } .box-img{ float:left; width:100px; height:100%; margin: 0 0 8px 0; } .box-img img{ width:100%; height:100%; } .p{ display:inline-block; float:left; width:70%; margin-top:6px; font-family: Microsoft YaHei; } .p1{ margin-top:16px; } @media only screen and (max-width: 400px) { .p{ width:50%; } } } </style> <script> //页面加载 获取全部信息 $(function(){
$.get("pictureServlet",function(result){ //result数据添加到表格中; addBox(result); }); }); function addBox(result){ //result是一个集合,所以需要先遍历 $.each(result,function(index,obj){ $("#box").append("<div class='product'>"+//获得图片地址 "<div class='box-img'><img src="+obj.url+"></div>"+ //获得商品名字 "<div class='p1 p'>"+obj.name+"</div>"+ //获得商品描述 "<div class='p2 p'>"+obj.descp+"</div>"+ //获得商品价格 "<div class='p3 p'>"+obj.price+"</div>"+ "</div>"); }); } </script> </head> <body> <!-- 构建装一个容器 --> <div id="box"> </div> </body> </html>
运行效果：
在手机端运行的时候，一定要注意加上下面一句
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
2.1 运行servlet：
3.1运用前端框架【MUI】
3.1.1，在HBuilder中新建一个Hello 模板项目
3.1.1，在项目中新建一个html文件--Mi.html
代码如下：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>淘水果</title> <meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <!--标准mui.css--> <link rel="stylesheet" href="css/mui.min.css"> <!--App自定义的css--> <link rel="stylesheet" type="text/css" href="css/app.css" /> <style> body{ font-family: "microsoft yahei"; } .title { margin: 20px 15px 10px; color: #6d6d72; font-size: 15px; } .oa-contact-cell.mui-table .mui-table-cell { padding: 11px 0; vertical-align: middle; } .oa-contact-cell { position: relative; margin: -11px 0; } .oa-contact-avatar { width: 75px; } .oa-contact-avatar img { border-radius: 50%; } .oa-contact-content { width: 100%; } .oa-contact-name { margin-right: 20px; } .oa-contact-name, oa-contact-position { float: left; } .img_webp{ width: 100%; height: 100%; } .boxt{ width: 100%; height: 200px; } .p1{ font-size: 14px; color: #000; } .p2{ font-size: 12px; color: #b0b0b0; } .p3{ font-size: 14px; color: #ff5f19; } .product{ width:100%; position: relative; margin: 20px 0 5px 0; height: 100px; background: #fafafa; } .box-img{ float:left; width:100px; height:100%; margin: 0 0 8px 0; } .box-img img{ width:100%; height:100%; } .p{ display:inline-block; float:left; width:70%; margin-top:6px; } .p1{ margin-top:16px; } @media only screen and (max-width: 400px) { .p{ width:50%; } } } </style> </head> <body> <header class="mui-bar mui-bar-nav"> <a class="mui-action-back mui-icon mui-icon-left-nav mui-pull-left"></a> <h1 class="mui-title">小米商城</h1> </header> <nav class="mui-bar mui-bar-tab"> <a class="mui-tab-item mui-active" href="#tabbar"> <span class="mui-icon mui-icon-home"></span> <span class="mui-tab-label">首页</span> </a> <a class="mui-tab-item" href="#tabbar-with-chat"> <span class="mui-icon mui-icon-email"></span> <span class="mui-tab-label">分类</span> </a> <a class="mui-tab-item" href="#tabbar-with-contact"> <span class="mui-icon mui-icon-contact"></span> <span class="mui-tab-label">购物车</span> </a> <a class="mui-tab-item" href="#tabbar-with-map"> <span class="mui-icon mui-icon-gear"></span> <span class="mui-tab-label">我的</span> </a> </nav> <div class="mui-content"> <div id="tabbar" class="mui-control-content mui-active"> <div id="slider" class="mui-slider"> <div class="mui-slider-group mui-slider-lhttp://127.0.0.1:8020/HTML5_2_1/d06.html#oop"> <!-- 额外增加的一个节点(循环轮播：第一个节点是最后一张轮播) --> <div class="mui-slider-item mui-slider-item-duplicate"> <a href="#"> <img src="images/mo-2.webp" class="img_webp"> </a> </div> <!-- 第一张 --> <div class="mui-slider-item"> <a href="#"> <img src="images/mo-1.webp" class="img_webp"> </a> </div> <!-- 第二张 --> <div class="mui-slider-item"> <a href="#"> <img src="images/mo-2.webp" class="img_webp"> </a> </div> <!-- 额外增加的一个节点(循环轮播：最后一个节点是第一张轮播) --> <div class="mui-slider-item mui-slider-item-duplicate"> <a href="#"> <img src="images/mo-1.webp" class="img_webp"> </a> </div> </div> <!--中间那张美女图--> <div class="picture"> <img src="images/mo0.webp" class="img_webp"> </div> </div> <!--这个盒子是用来装数据库查出来的商品的--> <div id="box"> </div> </div> <div id="tabbar-with-chat" class="mui-control-content"> 2 </div> <div id="tabbar-with-contact" class="mui-control-content"> 3 </div> <div id="tabbar-with-map" class="mui-control-content"> 4 </div> </div> </body> <script src="js/jquery-1.10.2.min.js" type="text/javascript" charset="utf-8"></script> <script src="js/mui.min.js"></script> <script > $(function(){ $.get("http://localhost:8080/PictureWeb/pictureServlet",function(result){ //result数据添加到表格中; addBox(result); }); }); function addBox(result){ //result是一个集合,所以需要先遍历 $.each(result,function(index,obj){ $("#box").append("<div class='product'>"+//获得图片地址 "<div class='box-img'><img src='http://localhost:8080/PictureWeb/"+obj.url+"'></div>"+ //获得商品名字 "<div class='p1 p'>"+obj.name+"</div>"+ //获得商品描述 "<div class='p2 p'>"+obj.descp+"</div>"+ //获得商品价格 "<div class='p3 p'>"+obj.price+"</div>"+ "</div>"); }); } </script> </html>
运行效果：
