Android的 - 如何从字符串解析JsonArray？ [英] Android - how to parse JsonArray from string?
问题描述
我试图解析来自JSON字符串一个JSON数组，但它总是抛出异常 java.lang.String类型的数据不能转换成JSONArray 。
请告诉我，如果我犯任何错误。
感谢。
下面是我的codeS从服务器获取的Json：
尝试{
字符串URL =的String.Format（小于URL这里＆gt;中province.province code2）;
HttpClient的HttpClient的= getHttpClient（）;
HTTPGET HTTPGET =新HTTPGET（URL）;
HTT presponse HTT presponse = httpClient.execute（HTTPGET）;
HttpEntity实体= HTT presponse.getEntity（）;
最后的字符串结果= EntityUtils.toString（实体）;
parseAndSaveJsonData（省，结果）;
}赶上（例外五）{
e.printStackTrace（）;
}
下面是codeS解析JsonArray：
字符串jsonString =＆LT;低于JSON字符串＆GT;
JSONArray JA =新JSONArray（jsonString）;
下面是我的JSON字符串：
[
{
LotPrizes：[
{
奖：Giảitám
范围：50
}，
{
奖：Giảibảy
范围：264
}，
{
奖：Giảisáu
范围：3654-5162-3097
}，
{
奖：Giảinăm
范围：9739
}，
{
奖：Giảitư
范围：97690-99274-32442-69432-04855-10132-17085
}，
{
奖：Giảiba
范围：73745-13007
}，
{
奖：Giảinhì
范围：05521
}，
{
奖：Giảinhất
范围：74870
}，
{
奖：GiảiDB6
范围：878833
}
]
}，
{
LotPrizes：[
{
奖：Giảitám
范围：50
}，
{
奖：Giảibảy
范围：264
}，
{
奖：Giảisáu
范围：3654-5162-3097
}，
{
奖：Giảinăm
范围：9739
}，
{
奖：Giảitư
范围：97690-99274-32442-69432-04855-10132-17085
}，
{
奖：Giảiba
范围：73745-13007
}，
{
奖：Giảinhì
范围：05521
}，
{
奖：Giảinhất
范围：74870
}，
{
奖：GiảiDB6
范围：878833
}
]
}
]
@Caerulius哈里什，ρяσѕρєяK，热舔，以及所有。 最后，术后第2天头痛和2个不眠之夜，我解决了这个问题。而且因为你花你的价值的时间和我商量，我看到，我要告诉你的根本原因。这是我的责任。的
首先，我是一名资深的Android开发者。所以，我至少知道JSON的基础，我知道如何解析来自JSON字符串的数据，我知道了许多有用的在线工具来验证它。我确认JSON字符串，我从服务器得到有效。
正如我告诉我的问题，我用最后的字符串结果= EntityUtils.toString（实体）; 得到JSON字符串 HttpEntity 对象。我在通用很多次，它的工作。没问题。但是，在这种情况下，它不是。
原来的JSON字符串是这样的：
[{
LotPrizes：[
{
奖：Giảitám
范围：50
}，
{
奖：Giảibảy
范围：264
}，
...
}]
但我得到这样的：
[{
\LotPrizes \：[
{
\奖：\Giảitám\，
\范围\：\50 \
}，
{
\奖\：\Giảibảy\，
\范围\：\264 \
}，
...
}]
这串与字符串常量，我们可以宣布为类似如下：
字符串stringVariable =\[{
\\\LotPrizes \\\：
{
\\\奖：\\\Giảitám\\\
\\\范围\\\：\\\50 \\\
}，
{
\\\奖\\\：\\\Giảibảy\\\
\\\范围\\\：\\\264 \\\
}，
...
}] \;
这是一个有效的字符串，而不是一个有效的JSON字符串。
要解决这个问题，我改变方式来获得JSON字符串，并删除不必要的字符是这样的：
的HttpClient的HttpClient = getHttpClient（）;
HTTPGET HTTPGET =新HTTPGET（URL）;
HTT presponse HTT presponse = httpClient.execute（HTTPGET）;
HttpEntity实体= HTT presponse.getEntity（）;
InputStream的是= entity.getContent（）;
的BufferedReader读卡器=新的BufferedReader（新InputStreamReader的（就是，UTF-8），8）;
StringBuilder的SB =新的StringBuilder（）;
串线= NULL;
而（（行= reader.readLine（））！= NULL）{
sb.append（行+\ N）;
}
is.close（）;
JSON字符串= sb.toString（）;
JSON = json.replace（\\，）;
JSON = json.substring（1）;
JSON = json.substring（0，json.length（） - 2）;
现在，在 JSON 变量包含JSON字符串，我可以正确地解析。我想这应该HttpEntity库的一个bug。
希望这有助于一些其他球员。
I am trying to parse a json array from json string but it always throws the exception data of type java.lang.String cannot be converted to JSONArray.
Please tell me if I make any mistake.
Thanks.
Here is my codes to get Json from server:
try {
String url = String.format(<url here>, province.provinceCode2);
HttpClient httpClient = getHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity entity = httpResponse.getEntity();
final String result = EntityUtils.toString(entity);
parseAndSaveJsonData(province, result);
} catch (Exception e) {
e.printStackTrace();
}
here is codes to parse JsonArray:
String jsonString = <below json string>
JSONArray ja = new JSONArray(jsonString);
Here is my json string:
[
{
"LotPrizes":[
{
"Prize":"Giảitám",
"Range":"50"
},
{
"Prize":"Giảibảy",
"Range":"264"
},
{
"Prize":"Giảisáu",
"Range":"3654-5162-3097"
},
{
"Prize":"Giảinăm",
"Range":"9739"
},
{
"Prize":"Giảitư",
"Range":"97690-99274-32442-69432-04855-10132-17085"
},
{
"Prize":"Giảiba",
"Range":"73745-13007"
},
{
"Prize":"Giảinhì",
"Range":"05521"
},
{
"Prize":"Giảinhất",
"Range":"74870"
},
{
"Prize":"GiảiDB6",
"Range":"878833"
}
]
},
{
"LotPrizes":[
{
"Prize":"Giảitám",
"Range":"50"
},
{
"Prize":"Giảibảy",
"Range":"264"
},
{
"Prize":"Giảisáu",
"Range":"3654-5162-3097"
},
{
"Prize":"Giảinăm",
"Range":"9739"
},
{
"Prize":"Giảitư",
"Range":"97690-99274-32442-69432-04855-10132-17085"
},
{
"Prize":"Giảiba",
"Range":"73745-13007"
},
{
"Prize":"Giảinhì",
"Range":"05521"
},
{
"Prize":"Giảinhất",
"Range":"74870"
},
{
"Prize":"GiảiDB6",
"Range":"878833"
}
]
}
]
Hi @Caerulius, Harish, ρяσѕρєя K, Hot Licks , and all. Finally, after 2 days of headache and 2 sleepless nights, I solved the issue. And because you spend your valued time to discuss with me, I see that I have to tell you the root cause. That's my responsibility.
First of all, I am a senior android developer. So, I at least know about JSON basic, I know how to parse data from JSON string, and I know many useful online tools to validate it. I confirm that the JSON string I got from server is valid.
As I told in my question, I used final String result = EntityUtils.toString(entity); to get JSON string from HttpEntity object. I have used this many times in the pass and it worked. No problem. But, in this case, it's not.
The original JSON string like this:
[{
"LotPrizes":[
{
"Prize":"Giảitám",
"Range":"50"
},
{
"Prize":"Giảibảy",
"Range":"264"
},
...
}]
But what I got like this:
"[{
\"LotPrizes\":[
{
\"Prize":\"Giảitám\",
\"Range\":\"50\"
},
{
\"Prize\":\"Giảibảy\",
\"Range\":\"264\"
},
...
}]"
This string is similar with the constant string which we may declare as below:
String stringVariable = "\"[{
\\\"LotPrizes\\\":[
{
\\\"Prize":\\\"Giảitám\\\",
\\\"Range\\\":\\\"50\\\"
},
{
\\\"Prize\\\":\\\"Giảibảy\\\",
\\\"Range\\\":\\\"264\\\"
},
...
}]\" ;
It's a valid string, but not a valid JSON String.
To fix this issue, I change the way to get JSON string, and remove unnecessary characters like this:
HttpClient httpClient = getHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity entity = httpResponse.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
String json = sb.toString();
json = json.replace("\\", "");
json = json.substring(1);
json = json.substring(0, json.length() - 2);
Now, the json variable contain JSON string which I can parse correctly. I think this should a bug of HttpEntity library.
Hope this helps some other guys.
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