如何在java中读取json字符串？
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How to read json string in java?
提问by Andreas Fritsch
This is my json-string:
这是我的 json 字符串：
[
{
"id": 1,
"ip": "192.168.0.22",
"folderName": "gpio1_pg3"
},
{
"id": 2,
"ip": "192.168.0.22",
"folderName": "gpio2_pb16"
}
]
I want to iterate about the array, because I will create an special object for each array member.
我想遍历数组，因为我将为每个数组成员创建一个特殊对象。
This is the way how I get the json string from an http url.
这就是我从 http url 获取 json 字符串的方式。
BufferedReader bufferedReader =
new BufferedReader(new InputStreamReader(inputStreams, Charset.forName("UTF-8")));
String jsonText = readAll(bufferedReader);
Could you give me an example how I can get an Array of all json-elements. One array-element have to contain the id, ip, and folderName.
你能给我举个例子，我怎样才能得到一个包含所有 json 元素的数组。一个数组元素必须包含 id、ip 和 folderName。
采纳答案by Yusuf K.
Hymansonor GSONare popular libraries for converting JSON strings to objects or maps.
Hymanson或GSON是用于将 JSON 字符串转换为对象或映射的流行库。
Hymanson example:
Hyman逊示例：
String json = "[{\"foo\": \"bar\"},{\"foo\": \"biz\"}]";
JsonFactory f = new JsonFactory();
JsonParser jp = f.createJsonParser(json);
// advance stream to START_ARRAY first:
jp.nextToken();
// and then each time, advance to opening START_OBJECT
while (jp.nextToken() == JsonToken.START_OBJECT)) {
Foo foobar = mapper.readValue(jp, Foo.class);
// process
// after binding, stream points to closing END_OBJECT
}
public class Foo {
public String foo;
}
回答by Rakesh KR
Try,
尝试，
JSONArray array = new JSONArray(jsonStr);
for(int i=0; i<array.length(); i++){
JSONObject jsonObj = array.getJSONObject(i);
System.out.println(jsonObj.getString("id"));
System.out.println(jsonObj.getString("ip"));
System.out.println(jsonObj.getString("folderName"));
}
OR you can try with Google's JSON library (google-gson)
或者您可以尝试使用 Google 的 JSON 库 (google-gson)
JsonParser jsonParser = new JsonParser();
JsonElement element = jsonParser.parse(your json string);
