ajax+servlet

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
    .a{
        margin-top: 20px;
    }
    .b{
        font-size: 20px;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
<script type="text/javascript" src="js/jquery-3.3.1.js"></script>
    <div align="center">
        <h1 style="color: red;">学生信息列表</h1>
    
        <table class="tb" id="tb">
            <tr>
                <td>id</td>
                <td>学生名称</td>
                <td>班级</td>
                <td>性别</td>
                <td align="center" colspan="2">操作</td>
            </tr>
            
            
        </table>
    </div>
    <script type="text/javascript">
    $(function() {
            $.ajax({
                   type:'POST',
                   url:'Servlet?method=list',
                   
               
                   success:function(data){
                       if(data.length>0){
                           var tr='';
                           $.each(data,function(index){
                             tr+='<tr><td>'+data[index].id+'</td><td>'+data[index].name+'</td><td>'+data[index].classroom+'</td>'+
                           '<td>'+data[index].sex+'</td><td><a href="Servlet?method=getStudentById&id='+data[index].id+'">修改</a>&nbsp<a href="Servlet?method=del&id='+data[index].id+'">删除</a></td></tr>'
                           
                           
                           })
                         
                           $('#tb').append(tr)
                           }
                   },
                   error:function(){
                       alert("错误")
                   }
               });
        });
    </script>
</body>
</html>

private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        req.setCharacterEncoding("utf-8");
        List<Student> list = dao.search();
        JSONArray array = new JSONArray();
    
    
        if(list.size()>0) {
        for (int i = 0; i < list.size(); i++) {
            JSONObject object = new JSONObject();
            object.put("name", list.get(i).getName());
            object.put("id", list.get(i).getId());
            object.put("classroom", list.get(i).getClassroom());
            object.put("sex", list.get(i).getSex());
            array.add(object);
        }
    
        System.out.println(array);
        resp.setContentType("application/json");
        resp.setCharacterEncoding("utf-8");
        resp.getWriter().write(array.toString());
        }
    }

可以在界面上局部刷新，无需点击list.jsp链接才能看到列表