JSON，Servlet，JSP [英] JSON, Servlet, JSP

问题描述

首先，我通过URL进行的HTTP POST接受4个参数. (参数1，参数2，参数3，参数4).

Firstly, my HTTP POST through a URL accepts 4 parameters. (Param1, Param2, Param3, Param4).

我可以从数据库传递参数吗?

Can I pass the parameters from the database?

输入URL后，返回的信息将使用JSON以文本格式显示 格式.

Once the URL is entered, the information returned will be in text format using JSON format.

JSON将返回{"Status":"Yes"}或{"Status":"No"}

The JSON will return either {"Status" : "Yes"} or {"Status" : "No"}

如何在servlet中执行此操作? doPost()

How shall I do this in servlets? doPost()

推荐答案

只需设置适当的内容类型和编码，然后将JSON字符串相应地写入响应即可.

Just set the proper content type and encoding and write the JSON string to the response accordingly.

String json = "{\"status\": \"Yes\"}";
response.setContentType("application/json");
response.setCharacterEncoding("UTF-8");
response.getWriter().write(json);

您可以考虑使用现有的JSON库来简化Java中的JSON(反序列化)工作，而不是自己编写JSON.例如 Google Gson .

Instead of composing the JSON yourself, you may consider using an existing JSON library to ease the job of JSON (de)serializing in Java. For example Google Gson.

Map<String, String> result = new HashMap<String, String>();
result.put("status", "Yes");
// ... (put more if necessary)

String json = new Gson().toJson(result);
// ... (just write to response as above)

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