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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.jpg‘,‘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.jpg‘,‘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.jpg‘,‘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.jpg‘,‘轻薄全金属，海量内容‘ ,‘999元‘);insert into picture values(5 ,‘小米盒子3s‘,‘img/5.jpg‘,‘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.jpg‘,‘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.jpg‘,‘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.jpg‘,‘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.jpg‘,‘RO反渗透直出纯净水‘ ,‘1299元‘);insert into picture values(10 ,‘小米手环 2‘,‘img/10.jpg‘,‘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=http://www.mamicode.com/"+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：
Java语言实现通过Ajax抓取后台数据及图片
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