一尘不染

如何在JSP中将字符串列表添加到JSON对象中?

jsp

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


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2020-06-10

共1个答案

一尘不染

“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());
%>

上面的代码将像您在问题中提到的那样输出。确保您的列表包含3条记录的倍数,否则可能会出现IndexOutOfBound异常。

2020-06-10