项目实战：通过axios加载水果库存系统的首页数据-编程知识

项目实战：通过axios加载水果库存系统的首页数据

1、创建静态页面

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><link rel="stylesheet" href="style/index.css"><script src="script/axios.min.js"></script><script src="script/index.js"></script>
</head>
<body><div id="div0"><div id="div_title"><p>欢迎使用水果库存系统</p></div><div id="div_fruit_table"><table id="fruit_tbl"><tr><th class="w25">名称</th><th class="w25">单价</th><th class="w25">库存</th><th>操作</th></tr><!--<tr><td><a href='edit.html?fid=1'>苹果</a></td><td>5</td><td>100</td><td><img class="delImg" src="imgs/del.png" onclick='delFruit(1)'/></td></tr>--></table></div></div>
</body>
</html>

2、创建首页index.css样式

.delImg{width:24px;height:24px;
}
body{padding:0;margin:0;background-color: #333333;
}
div{position:relative;float:left;
}
*{color:indigo;
}
#div0{width:80%;margin-left:10%;background-color: aliceblue;padding: 60px 0px;margin-top:20px;border-radius: 8px;
}
#div_title{width:80%;margin-left:10%;
}
#div_title p{text-align: center;font-size:28px;letter-spacing: 8px;
}
#div_fruit_table{width:80%;margin-left:10%;
}
#fruit_tbl{width:88%;margin-left:6%;border:1px solid lightgray;line-height: 32px;border-collapse: collapse;}
#fruit_tbl td , #fruit_tbl th{border:1px solid lightgray;text-align: center;font-weight: lighter;
}
.w25{width:25%;
}

3、通过axios加载数据index.js

function $(key) {if (key) {if (key.startsWith("#")) {key = key.substring(1);return document.getElementById(key);}} else {let nodeList = document.getElementsByName(key);return Array.from(nodeList);}
}
window.onload=function(){loadData();
}
loadData=function(){axios({method:'get',url:'/index'}).then(response=>{let fruitList = response.data//此处使用的是axios，那么响应回来的数据自动就是json，不需要再进行parse(如果是原始的ajax操作，那么一定需要parse)//let fruitArr = JSON.parse(fruitList)let fruitArr = fruitListfor(let i = 0 ; i<fruitArr.length; i++){let fruitTbl = $("#fruit_tbl")let tr = fruitTbl.insertRow()let fnameTD = tr.insertCell()let priceTD = tr.insertCell()let fcountTD = tr.insertCell()let operTD = tr.insertCell()let fruit = fruitArr[i]fnameTD.innerText = fruit.fnamepriceTD.innerText = fruit.pricefcountTD.innerText = fruit.fcountoperTD.innerHTML="<img class=\"delImg\" src=\"imgs/del.png\"/>"}})
}

4、创建显示水果清单IndexServlet

  <dependencies><dependency><groupId>jakarta.servlet</groupId><artifactId>jakarta.servlet-api</artifactId><version>6.0.0</version></dependency><dependency><groupId>com.csdn</groupId><artifactId>pro03-fruit-optimize</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.10.1</version></dependency></dependencies>

package com.csdn.fruit.servlet;
import com.csdn.fruit.dao.FruitDao;
import com.csdn.fruit.dao.impl.FruitDaoImpl;
import com.csdn.fruit.pojo.Fruit;
import com.google.gson.Gson;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
@WebServlet("/index")
public class IndexServlet extends HttpServlet {private FruitDao fruitDao = new FruitDaoImpl();@Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {List<Fruit> fruitList = fruitDao.getFruitList();fruitList.stream().forEach(System.out::println);//java object ->  java json stringGson gson = new Gson();String fruitListJsonStr = gson.toJson(fruitList);resp.setCharacterEncoding("UTF-8");resp.setContentType("application/json;charset=utf-8");PrintWriter out = resp.getWriter();out.println(fruitListJsonStr);out.flush();}
}