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getResource()This tutorial will demonstrate how to use the function to get the resource URL and read the resource file in Java .

getResource()Use the function to get the resource URL in Java

We will use the method in Java getResource()to obtain the URLs of three files: image.png, image1.png, resourcetext.txt.

We will getResource()pass the resource URL as a string in the body of the function. The function then searches for the given resource string and returns an object containing the URL.

grammar:

getResource(String);
public resource = yourclassname.getResource("Resource URL");

Sample code:

/*//you will learn how to get image URL in the following program
//import statements
 */
import java.lang.*;
import java.net.URL;
public class getImageUrl {
  public static void main(String[] args) throws Exception {
    getImageUrl obj = new getImageUrl();
    @SuppressWarnings("rawtypes") Class resource = obj.getClass();
    URL imageurl = resource.getResource("/image.png");
    System.out.println("Resource URL one is = " + imageurl);
    URL imageurl2 = resource.getResource("/image2.png");
    System.out.println("Resource URL two is = " + imageurl2);
    URL texturl = resource.getResource("/textresource.txt");
    System.out.println("Resource URL of the text file  is = " + texturl);
  }
}

Output:

Resource URL one is = file:/C:/Users/NAME/Desktop/JAVA/get%20resource%20url%20java/bin/image.png
Resource URL two is = file:/C:/Users/NAME/Desktop/JAVA/get%20resource%20url%20java/bin/image2.png
Resource URL of the text file is = file:/C:/Users/NAME/Desktop/JAVA/get%20resource%20url%20java/bin/textresource.txt

As we can see, we store the three files in the string URL. Then we use obj.getClass()the method to get the main class that receives the image URL.

getResource()function is a function that returns a URL.

getResourceAsStream()Get resource content using in Java

Java reserves a getResourceAsStream()method called to read files. This function returns a InputStreamobject containing the specified resource of the class.

For the following examples, we will use getResourceAsStream()to read this file: /get resource URL java/src/readfile/GetResourceReadFile.java. There is also the string getresourcefromhere = "readfile/example.json";where we store the JSON file.

grammar:

private InputStream getFileFromResourceAsStream(String getresourcefromhere) {
  ClassLoader cL = getClass().getClassLoader();
  InputStream inputStream = cL.getResourceAsStream(getresourcefromhere);
  return inputStream;
}

If you understand the basic syntax, check out the complete program below.

The program is available for every platform. You should pay attention to the main class and file directory management.

// import necessary packages
package readfile;
import java.io.*;
import java.nio.charset.StandardCharsets;
// start function
public class GetResourceReadFile {
  private static final String String = null;
  public static void main(String[] args) throws IOException, Exception {
    GetResourceReadFile app = new GetResourceReadFile();
    // get resource file
    String getresourcefromhere = "readfile/example.json";
    // use inputStream to return object containing resource
    InputStream getresourceandreadit = app.getFileFromResourceAsStream(getresourcefromhere);
    printInputStream(getresourceandreadit);
  }
  private InputStream getFileFromResourceAsStream(String getresourcefromhere) {
    // load class
    ClassLoader cL = getClass().getClassLoader();
    InputStream inputStream = cL.getResourceAsStream(getresourcefromhere);
    return inputStream;
  }
  private static void printInputStream(InputStream r) {
    try (InputStreamReader sR = new InputStreamReader(r, StandardCharsets.UTF_8);
         BufferedReader R = new BufferedReader(sR)) {
      String GOT_IT = String;
      // not necessary but will give you basic idea
      if (GOT_IT == String) {
        // you can print multiple files
        while ((GOT_IT = R.readLine()) != null) {
          // print file
          System.out.println(GOT_IT);
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

Output:

{
    "File Name": "Demonstration File",
    "File Type": "JSON FILE",
    "File Reader": "getResource",
    "File creation date:": 2/18/2022,
    "Platform": {
        "Langauge Type": "Programming",
        "Langugae Name": "JAVA",
        "Platform": "Oracle",
        "Importance": "Very High"
    },
    "Development Environment": [
        { "JDK": "JAVA", "LATEST": "17" }
    ]
}

The entire program is the same as the previous example with the URL . The only differences are InputStreamand ClassLoader cL = getClass().getClassLoader();.