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如何对包含多个字符串的字符串进行子串

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我有一个包含多个字符串的字符串对象..我想提取 "_json": 之后的部分，直到它到达 } 但是当我在我的代码中给出这个时，它告诉索引越界异常。 任何人都可以帮助提取那部分 我得到的字符串是

---------------------------------------------------------------------------
ClientError                               Traceback (most recent call last)
/opt/conda/lib/python3.7/site-packages/s3fs/core.py in _lsdir(self,path,refresh,max_items,delimiter,prefix)
    573                 dircache = []
--> 574                 async for i in it:
    575                     dircache.extend(i.get("CommonPrefixes",[]))

/opt/conda/lib/python3.7/site-packages/aiobotocore/paginate.py in __anext__(self)
     31         while True:
---> 32             response = await self._make_request(current_kwargs)
     33             parsed = self._extract_parsed_response(response)

/opt/conda/lib/python3.7/site-packages/aiobotocore/client.py in _make_api_call(self,operation_name,api_params)
    154             error_class = self.exceptions.from_code(error_code)
--> 155             raise error_class(parsed_response,operation_name)
    156         else:

ClientError: An error occurred (accessDenied) when calling the ListObjectsV2 operation: access Denied

The above exception was the direct cause of the following exception:

PermissionError                           Traceback (most recent call last)
<ipython-input-162-af0f8b8e4877> in <module>
      9 fs = s3fs.S3FileSystem(session=fs_session)
     10 bucket_name = "my_data_bucket"
---> 11 print(fs.ls(bucket_name))

/opt/conda/lib/python3.7/site-packages/fsspec/asyn.py in wrapper(*args,**kwargs)
     86     def wrapper(*args,**kwargs):
     87         self = obj or args[0]
---> 88         return sync(self.loop,func,*args,**kwargs)
     89 
     90     return wrapper

/opt/conda/lib/python3.7/site-packages/fsspec/asyn.py in sync(loop,timeout,**kwargs)
     67         raise FSTimeoutError
     68     if isinstance(result[0],BaseException):
---> 69         raise result[0]
     70     return result[0]
     71 

/opt/conda/lib/python3.7/site-packages/fsspec/asyn.py in _runner(event,coro,result,timeout)
     23         coro = asyncio.wait_for(coro,timeout=timeout)
     24     try:
---> 25         result[0] = await coro
     26     except Exception as ex:
     27         result[0] = ex

/opt/conda/lib/python3.7/site-packages/s3fs/core.py in _ls(self,detail,refresh)
    777             files = await self._lsbuckets(refresh)
    778         else:
--> 779             files = await self._lsdir(path,refresh)
    780             if not files and "/" in path:
    781                 files = await self._lsdir(self._parent(path),refresh=refresh)

/opt/conda/lib/python3.7/site-packages/s3fs/core.py in _lsdir(self,prefix)
    595                     f["name"] = f["Key"]
    596             except ClientError as e:
--> 597                 raise translate_boto_error(e)
    598 
    599             if delimiter and files:

PermissionError: access Denied

但是当我在代码中给出这个时，它给出了例外

===username===>>{"profile":{"id":"xxxxxx","name":{},"_raw":"{\"sub\":\"xxxxx\",\"country\":\"US\",\"firstname\":\"xxxx\",\"employeetype\":\"XXXX\",\"mail\":\"abc@yz.com\",\"gehrbusinesssegment\":\"avav\",\"gessobusinessunit\":\"AVI DT-xxxxx Engineering\",\"gessouid\":\"C2B0A5EB-8A20-170F-BF3E-002128B20D70\",\"cn\":\"Saha,Romit\",\"title\":\"Project Manager  (Backend)\",\"georaclehrid\":\"xxxxx\",\"lastname\":\"Saha\",\"uid\":\"xxxxx\",\"groupNAME\":[\"@GE AWS_bu-readonly_175070699551\",\"@GE AWS_bu-readonly_639624358806\",\"@AVIATION MRO Fulfillment Operations Advisor\",\"@POWER pge_role_super_user_dev\",\"@AVIATION DISE Friends of the Family\",\"@AVIATION MOA Users - Editor access\",\"@AVIATION MOA-Viewer-Users\",\"@Gas Power Smartshop Users\",\"@AVIATION US VPN GROUP\",\"@Digital Emergency Change Notification 23\"],\"gessocompanyname\":\"XXXXXX\",\"gehrindustrygroup\":\"XXXXXX\",\"gessojobfunction\":\"Information Technology\",\"street\":\"XXXXXPlaza\",\"location\":\"XXXX\",\"state\":\"XXX\",\"geECIndicator\":\"N\"}\r\n","_json":{"sub":"XXXX","country":"US","firstname":"Romit","employeetype":"XXX","mail":"XXX@ge.com","gehrbusinesssegment":"XXX","gessobusinessunit":"AVI DT-Data Infrastructure & Software Engineering","gessouid":"C2B0A5EB-8A20-170F-BF3E-002128B20D70","cn":"Saha,Romit","title":"XXXXXX(Backend)","georaclehrid":"XXXX","lastname":"Saha","uid":"502622018","groupNAME":["@GE AWS_bu-readonly_175070699551","@GE AWS_bu-readonly_639624358806","@AVIATION MRO Fulfillment Operations Advisor","@POWER pge_role_super_user_dev","@AVIATION DISE Friends of the Family","@AVIATION MOA Users - Editor access","@AVIATION MOA-Viewer-Users","@Gas Power Smartshop Users","@AVIATION US VPN GROUP","@Digital Emergency Change Notification 23"],"gessocompanyname":"XXXXX","gehrindustrygroup":"GE Aviation","gessojobfunction":"Information Technology","street":"XXXXX Plaza","location":"XXXX","state":"XXX","geECIndicator":"N"}},"accessTokenExp":1627090679000,"accessToken":"XXXXX","refreshTokenExp":1627105079000,"refreshToken":"XXXXX","user_info":{"family_name":"Saha","given_name":"Romit","user_name":"XXXXX"}}

错误：

String json = username.substring(username.indexOf("_json") + 1,username.indexOf('}'));
asas8520 回答：如何对包含多个字符串的字符串进行子串

由于输入字符串有多个}，子字符串的正在索引和结束索引超出范围

您当前的开始索引：1189 结束索引 53 导致 StringIndexOutOfBoundsException:

将 username.indexOf("}") 改为 username.lastIndexOf("}")

你可以尝试获取'}'的lastIndex

         int begin = username.indexOf("_json") +1;
         int end = username.lastIndexOf("}");
         System.out.println("begin:"+begin+" end:"+end );
         String json = username.substring(begin,end);
         System.out.println(" jsonString: "+json);

输出：

jsonString: json":{"sub":"502622018","country":"US","firstname":"Romit","employeetype":"Contractor","mail":"romit.saha@ge.com","gehrbusinesssegment":"Aviation Digital Technology","gessobusinessunit":"AVI DT-Data Infrastructure & Software Engineering","gessouid":"C2B0A5EB-8A20-170F-BF3E-002128B20D70","cn":"Saha,Romit","title":"Predix Senior Engineer (Backend)","georaclehrid":"502622018","lastname":"Saha","uid":"502622018","groupNAME":["@GE AWS_bu-readonly_175070699551","@GE AWS_bu-readonly_639624358806","@AVIATION MRO Fulfillment Operations Advisor","@POWER pge_role_super_user_dev","@AVIATION DISE Friends of the Family","@AVIATION MOA Users - Editor Access","@AVIATION MOA-Viewer-Users","@Gas Power Smartshop Users","@AVIATION US VPN GROUP","@Digital Emergency Change Notification 23"],"gessocompanyname":"General Electric Company","gehrindustrygroup":"GE Aviation","gessojobfunction":"Information Technology","street":"3200 Windy Hill Road,The Towers at Wildwood Plaza","location":"Atlanta","state":"GA","geECIndicator":"N"}},"accessTokenExp":1627090679000,"accessToken":"0003Kpc7Av3noCCKZrKpcSgPnRb2","refreshTokenExp":1627105079000,"refreshToken":"v4Qx3JcAd99zmZnd5WgvYJw83KHBUkAbnb9Ogn02jS","user_info":{"family_name":"Saha","given_name":"Romit","user_name":"502622018"}

更新：

我建议使用 ObjectMapper 将 jsonstring 转换为 POJO 并从对象访问值

使用工具将 json 字符串转换为 pojo

将用户名 json 字符串传递给以下代码会将 json 字符串映射到 java 对象 Root 您可以从各自的成员访问所需的数据 在这里root.getProfile().get_json()会让你_json

ObjectMapper om = new ObjectMapper();
Root root = om.readValue(userName),Root.class);

您的 pojo 如下

public class Name{
}


public class Json{
    public String sub;
    public String country;
    public String firstname;
    public String employeetype;
    public String mail;
    public String gehrbusinesssegment;
    public String gessobusinessunit;
    public String gessouid;
    public String cn;
    public String title;
    public String georaclehrid;
    public String lastname;
    public String uid;
    public List<String> groupNAME;
    public String gessocompanyname;
    public String gehrindustrygroup;
    public String gessojobfunction;
    public String street;
    public String location;
    public String state;
    public String geECIndicator;
}

public class Profile{
    public String id;
    public Name name;
    public String _raw;
    public Json _json;
}

public class UserInfo{
    public String family_name;
    public String given_name;
    public String user_name;
}

public class Root{
    public Profile profile;
    public long accessTokenExp;
    public String accessToken;
    public long refreshTokenExp;
    public String refreshToken;
    public UserInfo user_info;
}

另一个建议是您可以在发布问题之前屏蔽私人数据

,

您可以像这样使用 simple-json 库提取该值：

JSONObject jobj = (JSONObject) parser.parse(yourJsonString); 
    
        String _json= (String) jobj.get("_json"); // Extract the value from your key
    
        System.out.println(_json);
,

发生这种情况是因为当您说 username.indexOf('}') 时，它会取第一个 '}'，它位于用户名字符串中的 '_json' 索引之前。这给出了一个 StringIndexOutOfBoundsException，因为结束索引（substring 方法的第二个参数）需要在开始索引（substring 方法的第一个参数）之后。

您需要做的是 username.split('_json')，然后在拆分调用的后半部分调用 username.indexOf('}') 以获取 '_json' 之后的第一个 '}' 字符的索引.然后你就可以做username.substring(username.indexOf("_json") + 1,/*insert the index of the '}' character you found earlier here */)。

javajava-8jsonstring
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