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JSON->URL defines a text format for the JSON data model suitable for use within a URL/URI (as described by RFC3986). This repository holds the Java reference implementation of JSON->URL.

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jsonurl/jsonurl-java

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README.md

RFC8259 describes the JSON data model and interchange format, which is widely used in application-level protocols including RESTful APIs. It is common for applications to request resources via the HTTP POST method, with JSON entities. However, POST is suboptimal for requests which do not modify a resource’s state. JSON→URL defines a text format for the JSON data model suitable for use within a URL/URI.

The factory artifact defines a generic JSON->URL parser and includes an implementation based Java SE data types (e.g. java.util.Map, java.util.List, etc). There are two additional modules, distributed as separate artifacts, which implement a parser based on JSR-374 and Douglas Crockford’s Java API.

dependencies> dependency> groupId>org.jsonurlgroupId> artifactId>jsonurl-factoryartifactId> version>$ version> dependency> dependencies>

import java.util.Map; import org.jsonurl.j2se.JsonUrlParser; JsonUrlParser p = new JsonUrlParser(); Map obj = p.parseObject( "(Hello:World!)" ); System.out.println(obj.get("Hello")) // World!

dependencies> dependency> groupId>org.jsonurlgroupId> artifactId>jsonurl-jsonorgartifactId> version>$ version> dependency> dependencies>

import org.json.JSONObject; import org.jsonurl.jsonorg.JsonUrlParser; JsonUrlParser p = new JsonUrlParser(); JSONObject obj = p.parseObject( "(Hello:World!)" ); System.out.println(obj.get("Hello")) // World!

dependencies> dependency> groupId>org.jsonurlgroupId> artifactId>jsonurl-jsr374artifactId> version>$ version> dependency> dependency> groupId>org.glassfishgroupId> artifactId>javax.jsonartifactId> version>$ version> dependency> dependencies>

import javax.json.JsonObject; import org.jsonurl.jsonp.JsonUrlParser; JsonUrlParser p = new JsonUrlParser(); JsonObject obj = p.parseObject( "(Hello:World!)" ); System.out.println(obj.get("Hello")) // World!

All artifacts published to Maven Central include sources and javadoc JARs. You can browse the current, and all previous revisions, via Javadoc.io:

Additionally, Javadocs are also generated automatically on pushes to main.

The parser is designed to parse untrusted input. It supports limits on the number of parsed values and depth of nested arrays or objects. When the limit is exceeded a LimitException is thrown. Sane limit values are set by default.

About

JSON->URL defines a text format for the JSON data model suitable for use within a URL/URI (as described by RFC3986). This repository holds the Java reference implementation of JSON->URL.

Источник

Get JSON From URL in Java

In this guide, we will learn how to get JSON from URL in Java. The URLs are APIs containing data that you can convert to JSON for further use. We are assuming you are already familiar with the basic concepts of JSON in Java.

Get JSON From URL in Java

There are countless JSON URL samples available online. After reading this guide, you can also visit here and test any JSON URL. We will read the data stored in such APIs and present them in our output in JSON format. For instance, if we open this example URL (http://ip.jsontest.com/), it will open a webpage with the following output in JSON format.

Similarly, if we take this example URL (http://headers.jsontest.com/), the output would be as follows.

Now, let’s see how we can get the same JSON format from the URL. We’ll take the same two examples as above.

import java.io.*; import java.net.*; import java.nio.charset.*; import org.json.*;  public static void main(String[] args) throws IOException, JSONException   String url = "http://ip.jsontest.com/"; // example url which return json data  ReadJson reader = new ReadJson(); // To ReadJson in order to read from url.  JSONObject json = reader.readJsonFromUrl(url); // calling method in order to read.  System.out.println(json.toString()); // simple for printing.  > 

In the code example above, inside the main function, we store a URL inside a string. To read data from the URL, we created an object reader. We called the method readJsonFromUrl and integrated it with the object reader. Let’s see where the magic happens.

Inside readJsonFromUrl

public JSONObject readJsonFromUrl(String link) throws IOException, JSONException   InputStream input = new URL(link).openStream();  // Input Stream Object To Start Streaming.  try  // try catch for checked exception  BufferedReader re = new BufferedReader(new InputStreamReader(input, Charset.forName("UTF-8")));  // Buffer Reading In UTF-8  String Text = Read(re); // Handy Method To Read Data From BufferReader  JSONObject json = new JSONObject(Text); //Creating A JSON  return json; // Returning JSON  > catch (Exception e)   return null;  > finally   input.close();  > > 

In the above function, the link is assigned to input which will start the streaming process. To read the text from the character-input stream, we need to buffer the characters for efficient reading. Learn more about Buffers here. The above example will buffer in UTF-8 format. To read data from BufferReader, we created another public function, Read .

Inside the Function Read

public String Read(Reader re) throws IOException  // class Declaration  StringBuilder str = new StringBuilder(); // To Store Url Data In String.  int temp;  do    temp = re.read(); //reading Charcter By Chracter.  str.append((char) temp);   > while (temp != -1);  // re.read() return -1 when there is end of buffer , data or end of file.   return str.toString();  > 

Inside Read, we are simply storing URL data inside a string using the do. while loop. We are reading character by character and storing each of them inside temp. Using typecasting, we have all the data in characters inside str . str as a string stored inside Text in function readJsonFromUrl is returned. We create a JSON using JSONObject and return it.

To run the above program, we need to use the following command.

javac -cp 'org.json.jar' ReadJson.java java -cp 'org.json.jar' ReadJson.java 

The output for the example URL (http://ip.jsontest.com/) is as follows.

Haider specializes in technical writing. He has a solid background in computer science that allows him to create engaging, original, and compelling technical tutorials. In his free time, he enjoys adding new skills to his repertoire and watching Netflix.

Источник

How to Parse JSON from URL in Java

In this instructional exercise, you will figure out how to parse JSON from URL in java.
If you don’t know how to parse JSON from URL in java then you are at the right place to know your problem’s solution.

Parse JSON From URL In Java

Let’s start with what JSON is-JSON javascript object notation is simply a data representation format very similar to XML.
It is commonly used for API and configurations. It’s used because of lightweight and easy to read and write. It integrates easily with most of the languages.
Throughout your programming career, you’re going to use JSON all the time whether it’s creating an API or consuming an API or for creating config files for you to use or for other people to use for your application.

Let’s dive into some of the syntax involved in JSON by starting the types that JSON can represent. As we know JSON is a data representation format so we need to able to represent certain data types within it and JSON supports Strings, Numbers, Booleans, Null which represents nothing and Arrays which can be a list of any data types and an Object.

The first thing you need to do is to create a file with the dot JSON extension and that will create your JSON file inside of this file you need to take one of the types that JON supports and you put that inside of your file example you could put a string of numbers or whatever data you want.

Here below is the JSON file named user.json, you can create it by-

//JSON file with json extension i.e.,user.json < "name":"shubham", "favourite no":4, "is programmer":"true", "age":19, "address":< "street":"iel colony", "city":"bokaro", "state":"jharkhand", "postal code":829112 >>

The below code will help you to achieve your goal-

import java.io.*; import java.util.*; import org.json.simple.*; import org.json.simple.parser.*; public class JSONparse < public static void main(String[] args) throws Exception < // parsing file "user.json" Object object = new JSONParser().parse(new FileReader("http://localhost/BCA_B2/user.json")); JSONObject skr = (JSONObject) object; String Name = (String) skr.get("name"); long favouriteno = (long) skr.get("favourite no"); String isprogrammer=(String) skr.get("is programmer"); System.out.println(Name); System.out.println(favouriteno); System.out.println(isprogrammer); long age = (long) skr.get("age"); System.out.println(age); Map address = ((Map)skr.get("address")); Iteratoritr1 = address.entrySet().iterator(); while (itr1.hasNext()) < Map.Entry pair = itr1.next(); System.out.println(pair.getKey() + " : " + pair.getValue()); >>

Below is the output of the code-

Shubham 4 true 19 street:iel colony city:bokaro state:jharkhand postal code:829112

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