About ajax requests in jquery (detailed tutorial)

Below I will share with you a brief discussion of ajax requests in jquery and responses in servlets. It has a good reference value and I hope it will be helpful to everyone.

In jsp, first, you need to import the jquery shelf package:

Get the root path of the returnable site:

<% 
  String path = request.getContextPath(); 
%>

Write ajax request in jquery:

<script type="text/javascript">
     $(function(){
        $(".B").click(function(){
        $.ajax({
            type: "GET",
                     //对应servlet中的方法
            url: "<%=path%>" + "/queryEvaluateByuserId.do",
                     //返回是json数据
            dataType: "json",
            async:false,
           data:{
            },
            success: function(data){
              str = "";
               if(data != null){
                               //循环表单列表
                 for (var i in data)
                  {
                     var num = parseInt(i) + 1 ;                         
                    str +="<tr><td>" + num + "</td><td>" 
                    + data[i][&#39;name&#39;] + "</td><td>"
                    + data[i][&#39;price&#39;] + "元</td>" 
                    + "</tr>";
                  }
                 $(".trtd4").after(str);
               }else{
                 
               }
               
            },
            error: function(data){
            }
          }) 
      });
     }
</script>

jsp part:

<p class="tab-pane" id="B" style="text-align:center;"> 
          <p class="row marg" > 
            <table border="2 " style="width:80%;text-align:center;"> 
              <tr class="trtd4"> 
                <th>序号</th> 
                <th>业主名</th> 
                <th>金额</th> 
              </tr>              
            </table> 
          </p> 
        </p>

Alibaba’s fast json conversion package com.alibaba.fastjson.JSON is used in the servlet:

private void queryEvaluateByuserId(HttpServletRequest request, HttpServletResponse response) throws SQLException, IOException, ServletException{
			HttpSession session=request.getSession();
			request.setCharacterEncoding("UTF-8");
			response.setContentType("text/html");
			response.setCharacterEncoding("UTF-8");
			Cookie[] cookies = request.getCookies();
			int ownerId = 0;
			for (int i = 0; i < cookies.length; i++) {
	      Cookie cookie = cookies[i];
	      if (cookie.getName().equals("ownerId")) {
	      	ownerId = Integer.parseInt(cookie.getValue()); 
	      }
			}
			List<Order> orderList = new ArrayList<>();
			List<Evaluate> queryEvaluateList = new ArrayList<>();
			orderList = orderServiceImpl.queryOrderList(ownerId, null, null, null, null, null);
			List<Map<String, String>> workers = new ArrayList<Map<String, String>>(); 
			for(int i = 0;i < orderList.size();i++){
				Map<String,String> order = new HashMap<String, String>();
				order.put("description", orderList.get(i).getDescription());
				order.put("name", orderList.get(i).getOwnerName());
				System.out.println(orderList.get(i).getDescription());
				order.put("type",orderList.get(i).getTypeName());
				queryEvaluateList = orderServiceImpl.queryEvaluateListByUserId(orderList.get(i).getId());
				order.put("comment", queryEvaluateList.get(0).getComment());
				List<Allocation> allocation = orderServiceImpl.queryAllocationByOrderId(orderList.get(i).getId());
				order.put("price", String.valueOf(allocation.get(0).getPrice()));
				 System.out.println(order);
				workers.add(order);
			}
            //将map键值对转换成json，传给jsp
            response.getOutputStream().write(JSON.toJSONBytes(workers));
		}

The above is me I compiled it for everyone, I hope it will be helpful to everyone in the future.

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