搞Jedis案例出現問題，有大佬幫我看看怎麼解決嗎？先感謝大佬點進來看了---Day31

今天學了Jedis的相關內容,而後作了一個案例,可是出現了錯誤，而後我百度了一夜沒有解決，想到看看發個博客能不能有大佬幫我看一下問題出如今哪裏，百度了一夜有點懵逼。求大佬幫我解決，在這小弟我先萬分感謝大佬們點進來幫我看，感謝大佬們~

下面是案例需求：

　　案例需求：
　　　　1. 提供index.html頁面，頁面中有一個省份 下拉列表
　　　　2. 當 頁面加載完成後 發送ajax請求，加載全部省份

出現的錯誤：爲啥不同的瀏覽器會出現不同的錯誤，我都被搞懵了，這是要學到放棄啊~可是我不會放棄的，求大佬幫我看看哪裏出問題了🙏🙏

　　chrome瀏覽器出現的錯誤

 

　　Microsoft edge瀏覽器出現的錯誤

 

下面是個人代碼

 1 package cn.local.domain;  2 
 3 public class Province {  4     private int id;  5     private String name;  6 
 7     public Province() {  8  }  9 
10     public Province(int id, String name) { 11         this.id = id; 12         this.name = name; 13  } 14 
15     public int getId() { 16         return id; 17  } 18 
19     public void setId(int id) { 20         this.id = id; 21  } 22 
23     public String getName() { 24         return name; 25  } 26 
27     public void setName(String name) { 28         this.name = name; 29  } 30 
31  @Override 32     public String toString() { 33         return "Province{" +
34                 "id=" + id +
35                 ", name='" + name + '\'' +
36                 '}'; 37  } 38 }

數據庫類：

 1 package cn.local.dao;  2 
 3 import cn.local.domain.Province;  4 
 5 import java.util.List;  6 
 7 public interface ProvinceDao {  8     public List<Province> findAll();  9 
10 }

 

 1 package cn.local.dao.impl;  2 
 3 import cn.local.dao.ProvinceDao;  4 import cn.local.domain.Province;  5 import cn.local.util.JDBCUtils;  6 import org.springframework.jdbc.core.BeanPropertyRowMapper;  7 import org.springframework.jdbc.core.JdbcTemplate;  8 
 9 import java.util.List; 10 
11 public class ProvinceDaoImpl implements ProvinceDao { 12     //1.聲明成員變量 jdbctemplement
13     private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource()); 14 
15  @Override 16     public List<Province> findAll() { 17         //1.定義sql
18         String sql = "select * from province "; 19         //2.執行sql
20         List<Province> list = template.query(sql, new BeanPropertyRowMapper<Province>(Province.class)); 21         return list; 22  } 23 }

 

JDBC工具類

 1 package cn.local.util;  2 
 3 import com.alibaba.druid.pool.DruidDataSourceFactory;  4 
 5 import javax.sql.DataSource;  6 import java.io.IOException;  7 import java.io.InputStream;  8 import java.sql.Connection;  9 import java.sql.SQLException; 10 import java.util.Properties; 11 
12 public class JDBCUtils { 13     private static DataSource ds ; 14 
15     static { 16 
17         try { 18             //1.加載配置文件
19             Properties pro = new Properties(); 20             //使用ClassLoader加載配置文件，獲取字節輸入流
21             InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"); 22  pro.load(is); 23 
24             //2.初始化鏈接池對象
25             ds = DruidDataSourceFactory.createDataSource(pro); 26 
27         } catch (IOException e) { 28  e.printStackTrace(); 29         } catch (Exception e) { 30  e.printStackTrace(); 31  } 32  } 33 
34     /**
35  * 獲取鏈接池對象 36      */
37     public static DataSource getDataSource(){ 38         return ds; 39  } 40 
41 
42     /**
43  * 獲取鏈接Connection對象 44      */
45     public static Connection getConnection() throws SQLException { 46         return ds.getConnection(); 47  } 48 }

 

Jedis工具類

 1 package cn.local.jedis;  2 
 3 import redis.clients.jedis.Jedis;  4 import redis.clients.jedis.JedisPool;  5 import redis.clients.jedis.JedisPoolConfig;  6 
 7 import java.io.IOException;  8 import java.io.InputStream;  9 import java.util.Properties; 10 
11 public class JedisPoolUtils { 12     private static JedisPool jedisPool; 13 
14     static{ 15         //讀取配置文件
16         InputStream is = JedisPoolUtils.class.getClassLoader().getResourceAsStream("jedis.properties"); 17         //建立Properties對象
18         Properties pro = new Properties(); 19         //關聯文件
20         try { 21  pro.load(is); 22         } catch (IOException e) { 23  e.printStackTrace(); 24  } 25         //獲取數據，設置到JedisPoolConfig中
26         JedisPoolConfig config = new JedisPoolConfig(); 27         config.setMaxTotal(Integer.parseInt(pro.getProperty("maxTotal"))); 28         config.setMaxIdle(Integer.parseInt(pro.getProperty("maxIdle"))); 29 
30         //初始化JedisPool
31         jedisPool = new JedisPool(config,pro.getProperty("host"),Integer.parseInt(pro.getProperty("port"))); 32 
33 
34 
35  } 36 
37 
38     /**
39  * 獲取鏈接方法 40      */
41     public static Jedis getJedis(){ 42         return jedisPool.getResource(); 43  } 44 }

 

service類

 1 package cn.local.service;  2 
 3 import cn.local.domain.Province;  4 
 5 import java.util.List;  6 
 7 public interface ProvinceService {  8     public List<Province> findAll();  9 
10     public String findAllJson(); 11 }

 1 package cn.local.service.impl;  2 
 3 import cn.local.dao.ProvinceDao;  4 import cn.local.dao.impl.ProvinceDaoImpl;  5 import cn.local.domain.Province;  6 import cn.local.jedis.JedisPoolUtils;  7 import cn.local.service.ProvinceService;  8 import com.fasterxml.jackson.core.JsonProcessingException;  9 import com.fasterxml.jackson.databind.ObjectMapper; 10 import redis.clients.jedis.Jedis; 11 
12 
13 import java.util.List; 14 
15 public class ProvinceServiceImpl implements ProvinceService { 16     //聲明dao
17     private ProvinceDao dao = new ProvinceDaoImpl(); 18 
19  @Override 20     public List<Province> findAll() { 21         return dao.findAll(); 22  } 23 
24     /**
25  使用redis緩存 26      */
27 
28  @Override 29     public String findAllJson() { 30         //1.先從redis中查詢數據 31         //1.1獲取redis客戶端鏈接
32         Jedis jedis = JedisPoolUtils.getJedis(); 33         String province_json = jedis.get("province"); 34 
35         //2判斷 province_json 數據是否爲null
36         if(province_json == null || province_json.length() == 0){ 37             //redis中沒有數據
38             System.out.println("redis中沒數據，查詢數據庫..."); 39             //2.1從數據中查詢
40             List<Province> ps = dao.findAll(); 41             //2.2將list序列化爲json
42             ObjectMapper mapper = new ObjectMapper(); 43             try { 44                 province_json = mapper.writeValueAsString(ps); 45             } catch (JsonProcessingException e) { 46  e.printStackTrace(); 47  } 48 
49             //2.3 將json數據存入redis
50             jedis.set("province",province_json); 51             //歸還鏈接
52  jedis.close(); 53 
54         }else{ 55             System.out.println("redis中有數據，查詢緩存..."); 56  } 57 
58 
59         return province_json; 60  } 61 }

 

servlet類

 1 package cn.local.web.servlet;  2 
 3 
 4 import cn.local.service.ProvinceService;  5 import cn.local.service.impl.ProvinceServiceImpl;  6 
 7 import javax.servlet.ServletException;  8 import javax.servlet.annotation.WebServlet;  9 import javax.servlet.http.HttpServlet; 10 import javax.servlet.http.HttpServletRequest; 11 import javax.servlet.http.HttpServletResponse; 12 import java.io.IOException; 13 
14 @WebServlet("/provinceServlet") 15 public class ProvinceServlet extends HttpServlet { 16     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException { 17        /* //1.調用service查詢 18  ProvinceService service = new ProvinceServiceImpl(); 19  List<Province> list = service.findAll(); 20  //2.序列化list爲json 21  ObjectMapper mapper = new ObjectMapper(); 22  String json = mapper.writeValueAsString(list);*/
23 
24         //1.調用service查詢
25         ProvinceService service = new ProvinceServiceImpl(); 26         String json = service.findAllJson(); 27 
28 
29  System.out.println(json); 30         //3.響應結果
31         response.setContentType("application/json;charset=utf-8"); 32  response.getWriter().write(json); 33 
34  } 35 
36     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 37         this.doPost(request, response); 38  } 39 }

 

Html文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script src="js/jquery-3.3.1.min.js"></script>

    <script> $(function () { //發送ajax請求，加載全部省份數據
 $.get("provinceServlet",{},function (data) { //[{"id":1,"name":"北京"},{"id":2,"name":"上海"},{"id":3,"name":"廣州"},{"id":4,"name":"陝西"}]

                //1.獲取select
                var province = $("#province"); //2.遍歷json數組
 $(data).each(function () { //3.建立<option>
                    var option = "<option name='"+this.id+"'>"+this.name+"</option>"; //4.調用select的append追加option
 province.append(option); }); }); }); </script>

</head>
<body>



<select id="province">
    <option>--請選擇省份--</option>

</select>
</body>
</html>

 

配置文件

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql:///jedis
username=root
password=root
initialSize=5
maxActive=10
maxWait=3000

host=localhost
port=6379
maxTotal=50
maxIdle=10