In this example I’ll use the same file which we have generated in previous tutorial.
Maven Dependency:
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<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
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Previous Tutorial: http://crunchify.com/how-to-write-json-object-to-file-in-java/
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package com.crunchify.tutorials;
import java.io.FileReader;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
/**
* @author Crunchify.com
*/
public class CrunchifyJSONReadFromFile {
@SuppressWarnings("unchecked")
public static void main(String[] args) {
JSONParser parser = new JSONParser();
try {
Object obj = parser.parse(new FileReader(
"/Users/<username>/Documents/file1.txt"));
JSONObject jsonObject = (JSONObject) obj;
String name = (String) jsonObject.get("Name");
String author = (String) jsonObject.get("Author");
JSONArray companyList = (JSONArray) jsonObject.get("Company List");
System.out.println("Name: " + name);
System.out.println("Author: " + author);
System.out.println("\nCompany List:");
Iterator<String> iterator = companyList.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
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Other must read: Create and Deploy simple Web Service and Web Service Client in Eclipse
Output:
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Name: Crunchify.com
Author: App Shah
Company List:
Compnay: eBay
Compnay: Paypal
Compnay: Google
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Download json-simple-1.1.1.jar
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http://crunchify.com/how-to-read-json-object-from-file-in-java/
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