Java 将 BufferedReader 转换为 JSONObject 或 Map
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Converting BufferedReader to JSONObject or Map
提问by Sanura Hettiarachchi
My code sends a GET request to a server,
我的代码向服务器发送 GET 请求，
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("User-Agent", USER_AGENT);
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
I get a BufferedReader object that prints,
我得到一个打印的 BufferedReader 对象，
{
"status": "ERROR",
"errorCode": "MISSING_PARAMS",
"errorMessage": null,
"requestId": "20141014181739_11625805172",
"downstreamModuleErrorCode": null,
"object": [
"activity_code",
"activity_name",
"points",
"frequency",
"strategy",
"vsa_app_access_token"
]
}
I want to get a JSONOBject or a Map from this. I tried converting this into a String and manipulating it. But it's not that easy to do. Please help.
我想从中获取 JSONOBject 或 Map。我尝试将其转换为 String 并对其进行操作。但这并不容易。请帮忙。
采纳答案by Emanuel S
First do it as string. you can use custom librarys for that like
首先将其作为字符串。您可以使用自定义库，例如
String message = org.apache.commons.io.IOUtils.toString(rd);
or a StringBuilder
或 StringBuilder
StringBuilder sb = new StringBuilder();
String line;
br = new BufferedReader(new InputStreamReader(is));
while ((line = br.readLine()) != null) {
sb.append(line);
}
Then you can parse it. Since it's an object because of the "{" (array begin and ends with []) you need to create an JSONObject.
然后就可以解析了。由于它是一个对象，因为“{”（数组以 [] 开头和结尾），您需要创建一个 JSONObject。
JSONObject json = new JSONObject(sb.toString());
then you can access your elements with
然后你可以访问你的元素
//{ "status": "ERROR", "errorCode": "MISSING_PARAMS", "errorMessage": null, "requestId": "20141014181739_11625805172", "downstreamModuleErrorCode": null, "object": [ "activity_code", "activity_name", "points", "frequency", "strategy", "vsa_app_access_token" ]}
json.getString("status");
or the array with
或数组
JSONArray jsonArray = new JSONArray(json.getString("object"));
or you use the method getJSONArray()
或者您使用方法 getJSONArray()
JSONArray jsonArray = json.getJSONArray("object");
回答by Sandro Machado
Using this lib (org.json) you can convert strings to json objects: http://www.json.org/java/
使用这个库（org.json）你可以将字符串转换为 json 对象：http: //www.json.org/java/
JSONObject jsonObj = new JSONObject("{\"phonetype\":\"N95\",\"cat\":\"WP\"}");
回答by Milad Faridnia
InputStream inputStream = connection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder builder = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
builder.append(line + "\n");
}
JSONArray jsonArray = new JSONArray(builder.toString());
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject json = jsonArray.getJSONObject(i);
if (!json.get("object").equals(null)) {
JSONArray objectJsonArray = json.getJSONArray("object");
for (int i = 0; i < objectJsonArray.length(); i++) {
JSONObject json = objectJsonArray.getJSONObject(i);
}
}
}
Hope it helps.
希望能帮助到你。
回答by Jules
And what about this:
这又如何呢：
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
JsonReader reader = Json.createReader(in);
JsonObject object = reader.readObject();
String s = object.toString();
回答by jzheaux
In more recent versions of org.json, you can do:
在 的更新版本中org.json，您可以执行以下操作：
JSONTokener tokener = new JSONTokener(bufferedReader);
JSONObject json = new JSONObject(tokener);
As a quick proof, this works with org.json:json:20190722:
作为快速证明，这适用于org.json:json:20190722：
byte[] b = "{ \"active\" : true }".getBytes(StandardCharsets.UTF_8);
InputStream is = new ByteArrayInputStream(b);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is));
JSONTokener tokener = new JSONTokener(bufferedReader);
JSONObject json = new JSONObject(tokener);
