HttpServletRequest 获取 JSON POST 数据 [英] HttpServletRequest get JSON POST data

问题描述

我正在 HTTP POST 到 URL http://laptop:8080/apollo/services/rpc?cmd=execute

I am HTTP POST-ing to URL http://laptop:8080/apollo/services/rpc?cmd=execute

与POST数据

{ "jsondata" : "data" }

Http 请求的 Content-Type 为 application/json；字符集=UTF-8

Http request has Content-Type of application/json; charset=UTF-8

如何从 HttpServletRequest 获取 POST 数据(jsondata)?

How do I get the POST data (jsondata) from HttpServletRequest?

如果我枚举请求参数，我只能看到一个参数，这是cmd"，而不是 POST 数据.

If I enumerate the request params, I can only see one param, which is "cmd", not the POST data.

推荐答案

通常你可以用同样的方式在 servlet 中 GET 和 POST 参数:

Normaly you can GET and POST parameters in a servlet the same way:

request.getParameter("cmd");

但仅当 POST 数据被编码为内容类型的键值对时:application/x-www-form-urlencoded"就像您使用标准 HTML 表单一样.

But only if the POST data is encoded as key-value pairs of content type: "application/x-www-form-urlencoded" like when you use a standard HTML form.

如果您对发布数据使用不同的编码模式，例如发布 json 数据流，您需要使用自定义解码器来处理来自以下位置的原始数据流:

If you use a different encoding schema for your post data, as in your case when you post a json data stream, you need to use a custom decoder that can process the raw datastream from:

BufferedReader reader = request.getReader();

Json 后处理示例(使用 org.json 包)

Json post processing example (uses org.json package )

public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {

  StringBuffer jb = new StringBuffer();
  String line = null;
  try {
    BufferedReader reader = request.getReader();
    while ((line = reader.readLine()) != null)
      jb.append(line);
  } catch (Exception e) { /*report an error*/ }

  try {
    JSONObject jsonObject =  HTTP.toJSONObject(jb.toString());
  } catch (JSONException e) {
    // crash and burn
    throw new IOException("Error parsing JSON request string");
  }

  // Work with the data using methods like...
  // int someInt = jsonObject.getInt("intParamName");
  // String someString = jsonObject.getString("stringParamName");
  // JSONObject nestedObj = jsonObject.getJSONObject("nestedObjName");
  // JSONArray arr = jsonObject.getJSONArray("arrayParamName");
  // etc...
}

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