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# FileCopyUtils
**FileCopyUtils -** `org.springframework.util.FileCopyUtils`
It is a part of the Spring Framework's utility package. It provides static methods to perform file copy operations. This utility offer's methods for copying the contents of an `InputStream` to an `OutputStream`, as well as copying the contents of a file to another file or stream.
* **Copying contents from a file to a variable of String type.**
Create 2 sample files (for e.g. ***SampleXmlResponse.xml*** and ***SampleJsonResponse.json***) inside ***mocks*** folder.
Folder Structure
SampleJsonResponse.json
SampleXmlResponse.xml
{
"getWeatherResponse": {
```
"location": "New York",
"temperature": "75°F",
"conditions": "Sunny"
```
} } |
```xml
New York75°FSunny
```
|
Add logic in the main application class and execute the code.
```java
package org.example;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.util.FileCopyUtils;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
@Slf4j
public class Application {
private static final String SUB_DIRECTORY = "mocks";
private static final String XML_FILENAME = "SampleXmlResponse.xml";
private static final String JSON_FILENAME = "SampleJsonResponse.json";
public static void main(String[] args) {
log.info("Mock XML Response:\n{}", getMockResponse(XML_FILENAME));
log.info("Mock JSON Response:\n{}", getMockResponse(JSON_FILENAME));
}
@SneakyThrows
public static String getMockResponse(String fileName) {
var resourceLoader = new DefaultResourceLoader();
var resource = resourceLoader.getResource(String.format("classpath:%s/%s", SUB_DIRECTORY, fileName));
return FileCopyUtils.copyToString(new InputStreamReader(resource.getInputStream(), StandardCharsets.UTF_8));
}
}
```
Output
---
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