如何在JSP中将字符串列表添加到JSON对象中？

Z时代
2024-01-10
分类：问答

我已经用jsp编写了一个将值插入数据库的程序，现在我想从数据库中检索这些值并以json格式显示。我有名称，性别和年龄参数，我将其显示在列表中，我想将其显示为Users

{1：{name：abc，gender：male，age：21}，2：{name：xyz，gender：女，年龄：25}，......}

我的Jsp代码

<%
PrintWriter outt = response.getWriter();
JSONObject obj = new JSONObject();
Insert_UserDetails details = new Insert_UserDetails();
request.setCharacterEncoding("utf8");
response.setContentType("application/json");
List<String> list = details.getAllUsers();
JSONArray jArray = new JSONArray();
for (int i = 0; i < list.size(); i++) {
    JSONObject formDetailsJson = new JSONObject();
    formDetailsJson.put("result", list.get(i));
    jArray.add(formDetailsJson);
}
obj.put("form_details", jArray);
out.print(obj.toString());
%>

我得到的输出为：

{"form_details":[{"result":"arjun"},{"result":"male"},{"result":"21"},  
{"result":"ravi"},{"result":"male"},{"result":"30"},{"result":"pushpa"}, 
{"result":"female"},{"result":"57"},{"result":"usha"},{"result":"female"},
{"result":"60"},{"result":"bharat"},{"result":"male"},{"result":"30"},
{"result":"ramesh"},{"result":"male"},{"result":"29"},{"result":"ramesh"},
{"result":"male"},{"result":"29"}]}

我是json的新手，所以需要一些指导谢谢

回答：

“在jsp上编写Java代码是一种不好的做法”。虽然可以写。如我所见，列表包含字符串格式的所有详细信息，每个第3个索引间隔都有一个新的记录详细信息，您可以这样编写。

   <%
 PrintWriter outt = response.getWriter();
JSONObject obj = new JSONObject();
JSONObject finalJSON = new JSONObject();
Insert_UserDetails details = new Insert_UserDetails();
request.setCharacterEncoding("utf8");
response.setContentType("application/json");
List<String> list = details.getAllUsers();
int recordCounter=1;
JSONArray jArray = new JSONArray();
for (int i = 0; i < list.size(); i++) {
    JSONObject formDetailsJson = new JSONObject();
    formDetailsJson.put("name", list.get(i));
    formDetailsJson.put("gender", list.get(++i));
    formDetailsJson.put("age", list.get(++i));
    finalJSON.put(recordCounter,formDetailsJson);
    recordCounter++;
}
out.print(finalJSON.toString());
%>