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Java Getresourceasstream Example: Java Explained

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Java Getresourceasstream is a feature in the Java SE 9 version, which builds upon the existing Getresource and Getresourceasstream methods in Java SE 8. This new addition to the development platform allows developers to load data from the classpath as an input stream. In other words, it facilitates loading resources within the application classpath, ensuring that the application receives all the resources it needs and is not hindered by any external factors.

What is Java Getresourceasstream?

Java Getresourceasstream essentially enables developers to read resources that are part of the class path such as images and text files. This significantly simplifies long-winded and time-consuming manual searches. Rather than digging through the application system at a low level to locate the desired resource files, this method will quickly allow developers to locate and obtain them.

The Java Getresourceasstream method is also useful for loading resources from a jar file. This is especially useful for applications that are distributed as a single jar file, as it allows developers to access resources without having to unpack the jar file. Additionally, this method is also useful for loading resources from a web application, as it allows developers to access resources without having to deploy the application.

Advantages of Java Getresourceasstream

The main advantage of Java Getresourceasstream is that it allows for much quicker resource lookup and loading. This can significantly reduce development time and increase the speed of deploying applications. Also, this new feature does away with the need for specifying individual file paths. Developers can now hand over part of their jobs to the system, allowing it to identify and select the required resource more accurately.

In addition, Java Getresourceasstream is also beneficial for applications that require multiple resources. By using this feature, developers can easily access multiple resources in a single call, which can save time and effort. Furthermore, this feature also allows for more efficient resource management, as it allows developers to easily access and manage resources from a single location.

How to Use Java Getresourceasstream

To use Java Getresourceasstream, developers need to first create a ClassLoader using the getClassLoader() method. This should then be used in combination with the getResourceAsStream() method to scan packages within the java class path and identify any required files. The file should then be loaded as a byte stream.

Once the file is loaded, developers can use the read() method to read the contents of the file. This method will return an array of bytes which can then be used to create a String object. Developers can also use the available() method to determine the number of bytes available in the stream. This can be used to ensure that all of the data is read from the stream.

Examples of Java Getresourceasstream in Action

Let’s look at a practical example of how Java Getresourceasstream works. Suppose you wish to load an image file called “myimage.jpg”. First, you should create a ClassLoader by using the below code:

ClassLoader classLoader = this.getClass().getClassLoader();

You then combine this with the getResourceAsStream() method to read and load your desired “myimage.jpg” file:

InputStream input = classLoader.getResourceAsStream("myimage.jpg");

The same steps apply whether you wish to load an image file, text file or anything else that is part of the java class path. Note that the resource will be loaded as a byte stream.

Once the resource is loaded, you can use the InputStream object to read the contents of the file. For example, if you are loading an image file, you can use the read() method to read the bytes of the image file and then use the ImageIO class to create an image object from the bytes.

Troubleshooting Common Issues with Java Getresourceasstream

The most common issue that people encounter when using Java Getresourceasstream is loading incorrect files. This can happen if you have not specified the file name or package correctly. To fix this, you should review all your lines of code and check that you have specified each input file correctly.

Another issue that can arise is that the file is not found. This can be caused by a variety of reasons, such as the file not existing in the specified location, or the file not having the correct permissions. To fix this, you should check the file path and ensure that the file is in the correct location and has the correct permissions.

Alternatives to Java Getresourceasstream

Java Getresourceasstream is not the only way to read data from your java application’s class path. Other options include manually searching for the desired resource and using ObjectInputStream or Calendar classes to obtain resources.

You can also use the ClassLoader.getResource() method to read resources from the classpath. This method returns a URL object, which can then be used to read the resource. Additionally, you can use the Class.getResourceAsStream() method to read resources from the classpath. This method returns an InputStream object, which can then be used to read the resource.

Conclusion

Java Getresourceasstream is a great feature of Java SE 9, which allows developers to quickly locate and load resources within the application classpath. It is relatively easy to use and a great time-saver when compared to manual methods. We hope this article has been helpful in explaining what it is and how to use it, and have given you a better understanding of its advantages and possible alternatives.

It is important to note that Java Getresourceasstream is not the only way to access resources within the application classpath. Other methods such as the ClassLoader.getResource() method can also be used. However, the Getresourceasstream method is the most efficient and reliable way to access resources within the application classpath.

Anand Das

Anand Das

Anand is Co-founder and CTO of Bito. He leads technical strategy and engineering, and is our biggest user! Formerly, Anand was CTO of Eyeota, a data company acquired by Dun & Bradstreet. He is co-founder of PubMatic, where he led the building of an ad exchange system that handles over 1 Trillion bids per day.

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