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How to load JSON from socket and parse values of elements ?
Take a look at the Java tutorial on Reading from a Socket.
You can then use a JSON parser such as google-gson to convert the JSON string to a Java object.
Reading from a socket is a kind of basic java
About JSON, if you need performance I recommend you to take a look to Jackson ( http://jackson.codehaus.org/ ) as it's one of the fastest implementation available
(see at http://code.google.com/p/thrift-protobuf-compare/wiki/Benchmarking )
Have a look at REST Assured. It makes it very easy to parse json data using JsonPath.
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Then how do I create the POJO for such type and how do I use it in retrofit. My JSON response is of this type. This is like an array and i know how to parse only the simple ones.
["a",{"a_id":"1","a":"10","n":"100"},
{"a_id":"2","a":"100","n":"10000"},
{"a_id":"3","a":"500","n":"5000"},
{"a_id":"4","a":"1000","n":"100000"},
{"a_id":"5","a":"5000","n":"500000"}]
For the Pojo Simply use this link http://www.jsonschema2pojo.org/, paste response into, and select Annotation style:Gson, Source type:Json and leave others as default.
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I have been working on a java algorithm and I want to improve it by allowing it to accept and process very large String values.
Could you suggest me any good ways of storing the input/output results. I've been thinking of writing it on a file with the readLine(), writeLine() methods? Is this a good technique ???
I recommend you to store all your string in a text file (if possible) and use BufferedReader utilities ...
here is the a link to how its done :
https://www.tutorialspoint.com/java/io/bufferedreader_readline.htm
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I'm working with such resource:
https://coinmarketcap-nexuist.rhcloud.com/api/all
It returns list of cryptocurrencies and current prices in json.
Spring boot is in my stack so for all previous cases it converts json to my domain object well.
But now i'm experiencing problem because one of currency names starts with a number. As you know it's not possible to use number as first variable letter.
I've googled to find some workaround without any success. Does anybody knows how to handle it?
Thanks!
If you're using Jackson to parse the JSON into Java Objects then you can specify the JSON Property name to parse it. For example:
#JsonProperty("404_StartingWithADigit")
String data;
The data variable will hold whatever value was present in the JSON. More details about Jackson Annotations.
GSON provides a similar annotation #SerializedName which does the same thing. More details are available here.
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What is the best way to pass an ArrayList<Object> from server to client?
After i have to put my ArrayList in a JTable.
You have to serialize it when you write to the socket and deserialize when you read from the socket.
Ultimately you're sending Strings on the wire. Transport doesn't know or care anything about objects on either end of the conversation. TCP/IP is language independent.
You have many choices to choose from:
Java Serializable - this means sending byte code on the wire.
XML. You can use JAXB.
JSON. You can use Jackson.
Custom protocol of your own design.
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I have encountered a problem using byte array. The exception it suggested to me that I ought to use Blob in the properties of HttpServletRequest , but I can not find information about this.
The complete package: com.google.appengine.api.datastore.Blob
Can you say I like this class uses? or any web which has examples
There is an example of extracting blobs, I think here.
http://www.programcreek.com/java-api-examples/index.php?api=org.apache.commons.fileupload.FileUpload
I'm not familiar with the datastore, but as far as I know, Blob types are 'just' wrappers for byte arrays.