Spring read file from resources Solutions. 2. exists() // true but not the files within the dir. you can convert to a json object using your favourite json library. This annotation facilitates the injection of file contents into a String variable. public void testResourceFile() throws IOException { File resource = new ClassPathResource("test. spring boot 项目打包成 jar 部署之后，如果我们需要从 resources 目录读取文件，需要用流的方式读取而不能采取读普通文件的方式。 Jan 21, 2012 · Spring – Read file from resources folder – Mkyong. io. yml" is located in src/test/resources/configs folder. The reason is that resource files in the resource folder are stored inside a jar. If I could get the file, I could call dir. getClass(). I have a maven Spring project, there is xml file inside src/main/resources/xyz. src/main/resources/ For example, an image file in the src/main/resources/ folder There are many ways to read a file from the resource folder in Spring Boot but following are the most popular ways to read a file; • Using Spring Resource Interface. In the end, the approaches detailed here will help us when reading a file from the Maven resources folder or accessing a file from the file system. How can I read it inside spring MVC controller. It is common practice for unit testing in the Spring JUnit test to load files and their content to make more robust test cases. nio. Resource - the one Raphael Roth already mentioned. The Resource folder is available in the Spring Project structure and we have provided a related image below for a better understanding of the concept. Add a comment | Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. java src\main\java\com\opensymphony\xwork2\util\ClassLoaderUtil. There are several ways to load resource files in a Spring Boot application. The following example illustrates the utilization of the @Value annotation for reading a file from the resources folder: May 27, 2019 · Introduction: Working With Resources In Spring via ResourceLoader. – Krzysztof Ziomek. We are now going to check how we can load a file from classpath in spring boot if the file is present in the filesystem not inside a jar. Apr 30, 2025 · For example: @Autowired private ResourceLoader resourceLoader; public void readFile(String filePath) throws IOException { Resource resource = resourceLoader. o @Value annotation. using Jackson you can do May 8, 2019 · I am using Spring boot 2. Use Spring's `ResourceLoader` or `@Value` annotation to access the file easily. We might also have a file in src/test/resources with data for stubs that could be used by libraries like WireMock. Most of the time, we will reference files contained in our application resources, as they are Nov 5, 2019 · Sometimes if you are reading different extension file like . o ClassPathResource. Apr 28, 2023 · 前言. Resource; import org. 1 resource resolvers. springframework. json you need to read it as InputStream using spring ResourceLoader, this article has clear explanation @Autowire private ResourceLoader resourceLoader; Resource resource =resourceLoader. txt into the src/main/resources folder: some data in a file Read a File from the Resource Folder using ClassPathResource May 5, 2017 · Resource resource = new ClassPathResource("abc. txt"). The problem is how to reference that resource file Spring Boot Test Apr 12, 2022 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Jan 20, 2017 · I’m trying to read a text file using Spring resource loader like this : Resource resource = resourceLoader. Using spring classpathresource you should be able to load them. Let’s imagine we have the following file, data/employees. Asking for help, clarification, or responding to other answers. json"). csv The JSON file is not placed correctly in the resources folder. cert files via resolver. Reading Resource Data. Firstly, we'll inject a file as Resource using the @Value annotation. Spring ResourceLoader provides a unified getResource() method to retrieve an external resource by the resource path. Ensure that test resources are placed in the correct directory, usually `src/test/resources`. For example, in the file system, classpath, or URL. Inject File As Resource. Finally I get the xsd with, In this tutorial, we're going to look at how we can access files as Resources using Spring. This applies to the json,txt,csv files you may have added to the resources folder of your spring boot project structure. getInputStream(), it doesn't return any contents. Here, I am trying to read config. As we have already discussed, we can easily obtain a File or an InputStream reference from the Resource. Commented Feb 12, 2020 at 13:53. I have referred a lot of pages from Stackoverflow, and other Sep 15, 2015 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Mar 26, 2020 · Because it isn't a file. 0. An example as follow: An alternative method for reading a file from the resources folder in Spring Boot involves leveraging the @Value annotation. Using ClassPathResource class provided by Spring Core, you can read a resource file using both absolute and relative paths. To read a resource file through an absolute path, simply use: Oct 1, 2024 · This path is relative to the src/main/resources directory, which is where your resource files should be stored in a standard Spring Boot project. 1 The below example uses Files. First we need to get reference to resource by one of three proposed methods. Spring helps us find and read a resource using the resource loader, which decides which Resource implementation to pick depending on the path provided. core. readTree(jsonFile); No need to deal with InputStream, Spring takes care of that for you. The most simple solution can be: Copy a file from resources to the temporary folder and get a path to that temporary file. 1- ClassPathResource. getResourceAsStream(" Jan 10, 2020 · Read the json file like. We will see each one of them in detail with code example, so that you can use them in your code. yml in springboot spring: config: import: - optional: Feb 7, 2025 · Accessing Files Using ClassLoader. I am using InputStream is = getClass(). From OS’s point of view, its a single file and if you want to access a part of the file you must use it as a stream. getFile(); String text = new Jan 10, 2020 · Reading files from a Spring Boot application is possible through Java 8 NIO API. Once we have a Resource, it’s easy for us to read the contents. A file, in the sense of a java. Sep 1, 2023 · The ClassPathResource is a concrete implementation of Spring's Resource interface that provides an abstraction over ClassPathResource offers a method to read the resource as a java. Provide details and share your research! But avoid …. xml. Jan 8, 2024 · As we can see, the Files API offers another easy way to read the file contents into a String. graphql or . txt |_ conf2 |_ config. g. Jan 4, 2025 · In this article, we will discuss how to read file from the resources folder in Spring Boot. getFile(); and many more trails I made to get the resource or classloader etc. When I try to read this file using stateFile. Reading with Scanner Aug 14, 2020 · Spring has its own mechanism for resource loading. Kotlin + Spring way: Question was about reading file from resource in kotlin Spek test. Feb 7, 2020 · A JAR is a single file (kind of like a zip file) holding lots of files together. File file = new File( this. getFile(); // Read the file using file reading operations } This approach is suitable for reading files present in the classpath. getResource("someName. Jun 7, 2017 · To reliably get a file from the resources in Spring Boot application: Find a way to pass abstract resource, for example, InputStream, URL instead of File; Use framework facilities to get the resource; Example: read file from resources Aug 27, 2023 · Learn to read a file from the '/resources' folder in a Spring boot application using ClassPathResource, ResourceLoader interfaces and @Value. Here’s how you can read a file from the resources directory in a Spring Boot application: Aug 29, 2019 · Frequently, we need to read external resources into our Spring application. txt. defaultCharset()); to get the text. json") Resource stateFile; I have state. Misconfiguration in the Spring context or an issue with path resolution. These resources may be Feb 23, 2015 · You can't use a file from a resource folder for tests in a common case. Aug 27, 2022 · In this lesson, you will learn to read a file from the resources folder in Spring Boot and we will cover the following ways: Using the ClassPathResource class; Using the ResourceLoader interface; Let’s put the file data. getResource("classpath:" + filePath); File file = resource. util. This article demonstrates how to read files from the resources folder in a Spring Boot application, which is Mar 3, 2021 · In this short tutorial we will show you how to read the files from the /src/test/resources directory path. Or we have a test case where we need perhaps read or write data or test specific files in general. Jul 20, 2023 · My file "products. Dec 24, 2012 · You can use Spring's Resource Interface to get the content of text file, and then use StreamUtils. 2 Here are some examples of how that class is used: src\main\java\com\company\test\YourCallingClass. May 11, 2024 · How to map and handle static resources with Spring MVC - use the simple configuration, then the 3. walk to read all files from a folder src/main/resources/json: Incorrect file names or extensions can lead to file-not-found issues. To demonstrate a way to read files from the resource folder after packaged, I have created a small command line Spring Boot application that implements the following requirements. 1. Open Spring Tool Suite IDE, select menu File > New > Spring Starter Project. 1. S Tested with Spring 5. I am facing issues with jar execution. Anything from test/resources is copied to target/test-classes just before the test phase. RELEASE. Otherwise , it tries to find in file system. Jul 30, 2014 · If we don’t know the exact filename and want to read all files, including sub-folder files from a resources folder, we can use the NIO Files. Spring Resource Interface The Spring Resource is a … Sep 9, 2024 · Reading a file from the resources folder in a Spring Boot application is a common requirement, especially for loading configurations, test files, or other static resources at runtime. Create New Spring Boot Project. xsd"); File file = resource. Understanding the classpath is essential as it contains the resources needed for our applications, such as properties files, XML configurations, or any other static resources. 1 more flexible one and finally the new 4. Er In this Spring Boot tutorial, we learn how to read resource files located in the resources folder in a Spring Boot application using ResourceLoader class. For eg. Apr 15, 2017 · I'm trying to read a file from classpath like this in my unit test: @Value("classpath:state. getFile(); JsonNode node = objectMapper. mmdb"); InputStream dbAsStream Dec 4, 2023 · Learn different ways to load resources or files (e. json file in src/test/resources directory. Mar 26, 2025 · In this brief article, we’ve examined a few ways to access and read a resource from the classpath using Spring. getResource("classpath:mydir") dir. dir. I had the same problem trying to load some XML files into my test classes. getClassLoader(). getResource("classpath:GeoLite2-Country. What am I doing wrong? Mar 17, 2024 · Sometimes during unit testing, we might need to read a file from the classpath or pass a file to an object under test. • ResourceUtils. In the next sections, we’ll look at other less common methods of reading a file that may be appropriate in some situations. getInputStream(), Charset. Spring BootでConfigurationクラスを用いてBean定義する方法をメモしておきます。このBean定義の方法は、主にコンポーネントスキャンによる自動登録ができない（例. Other methods in some Spring APIs (such as the constructors to various ApplicationContext implementations) take a String which in unadorned or simple form is used to create a Resource appropriate to that context implementation or, via special prefixes on the String May 5, 2025 · Learn to read a file from the ‘/resources’ folder in a Spring boot application using ClassPathResource class, ResourceLoader interface or @Value annotation @Autowired private ResourceLoader If the above doesn't work, various projects have been added the following class: ClassLoaderUtil 1 (code here). getFile(). Use `ClassPathResource` to load the resources and handle file reading errors properly. But I get a FileNotFoundException when I try to execute my application. io . 6. This isn't a file it is a resource from within a jar, which can only be read through an InputSream. This includes eager and lazy loading, and on the filesystem or in a jar. As long as you try load this file inside spring context, Spring container is aware of its classpath . copyToString(resource. Apr 13, 2019 · In Spring, we can use ClassPathResource or ResourceLoader to get files from classpath easily. dat, on the classpath*:* Joe Employee,Jan Employee,James T. cert"); This will load all the certificates May 24, 2016 · The "duplicates" provided don't answer how to read a resource file, but files in general. 4. Sep 2, 2023 · 💻📄🍃 Reading Files from the Resources Folder in Spring Boot: A Guide 🌟 Are you using Spring Boot and struggling to read a file from the resources folder? 😫 Don't worry, you're not alone! This common issue can be tricky to resolve, but fear not! In thi In this Java Spring Boot tutorial, we learn how to use ResourceUtils class to read resource files located in the resources folder of a Spring Boot application. com. These resources may be present at different locations. In this Spring Boot tutorial, we learn how to read files located in the resources folder in a Spring Boot application using ClassPathResource class. Spring itself uses the Resource abstraction extensively, as an argument type in many method signatures when a resource is needed. The Resource is effectively a way of accessing the content of the resource, rather than the content itself. text files, XML files, properties files, or image files) into the Spring application context. Your code will work if Jul 21, 2019 · In this tutorial, we discuss several ways of reading a resource file from classpath in a Spring MVC application. Frequently, we need to read external resources into our Spring application. ClassPathResource import org. Nov 21, 2023 · A common task when developing applications is reading from input files and writing to output files. So they don't have a real path in the file system. In this tutorial, we’ll learn how to read the path of the /src/test/resources directory. Classpath may not be correctly configured in the project's build settings. getResources("client_cert/*. – Jan 29, 2019 · I would like to read files from sub directories of resource folder. walk to easily access and read the files. getFile(); // or File jsonFile = jsonResource. 4. src/main/resources |_ Conf |_ conf1 |_ config. May 11, 2024 · 4. Reading as a File Nov 18, 2015 · Resource dir = resourceLoader. Those copied resources will be available on the classpath. To avoid issues with hard-coded paths, you should use the ClassLoader to load resources dynamically from your classpath. If you use Spring, as one can suggest from your question, the easiest way is to use org. Let’s explore the three main options. This guide will cover various methods to access these files using Spring, detailing their use cases with practical examples. This is my directory structure. Using ResourceLoader Jun 16, 2023 · use a PathMatchingResourcePatternResolver (resolver); filter out all . Jun 20, 2024 · We can simplify locating a resource file by using the Resource interface. getFile(); and I am getting this error: java. txt files from all sub directories of Conf folder. mmdb or . txt"); The file locates here in my Spring boot project: Oct 16, 2022 · Reading as a File:-There is another way to load resources in spring boot. I have used ResourceLoader to do it. File is a physical file on the filesystem. How to Load Resource Files in Spring Boot. • ResourceLoader. Using Oct 15, 2017 · Try below code. Spring Boot provides several mechanisms to achieve this, making the process both efficient and straightforward. Maven Dependencies Oct 4, 2017 · I am going to read a file available in resources folder in my Springboot application. I have defined config import in my application. getFile() // explodes with FileNotFoundException But I can't find a way to get the "child" resources. getFile() ); Further you can use file object however you want to use. On the New Spring Starter Project popup input new project information as below and click Nov 14, 2017 · Though, some approaches don't work if the application is being packaged, for example when using mvn package from the spring-boot-maven-plugin. Using ResourceLoader: @Autowired private ResourceLoader I am accessing a File inside the resources folder from the main class File file = new ClassPathResource("remoteUnitsIdsInOldServer. Examples of external resources are text files, XML files, properties files, and image files. file Feb 26, 2021 · with Spring-boot, the easy way to load a json in the classpath (for example in the resources folder) would be : File jsonFile = new ClassPathResource("data. 4, trying read a json file which is placed in resources/ directory, but getting the 'FileNotFoundException'. listFiles(), but. Place the JSON file in the `src/main/resources` directory to ensure it is included in the classpath. Employee 4. P. getResource("classpath:\\static\\Sample. java src\main\resources\test. So it should load corresponding file. utzepg jdigo rjlx ktlr qstggf aejyt awnmd bjidgpd nojaukw xzciq