To learn this, we need to first learn about the org.springframework.core.io.Resource interface. This interface contains some methods which you can learn from the above url. All those methods are are self-explanatory. One method that I would like to pin point is the createRelative() method.
This method takes in a string, the relative path of the current resource and creates a resource object for it. An example, will give you a better understand. For example, consider a resource 'r' pointing to the E:/java/sample.txt. Now, when i call r.createRelative("ding/asdf.txt"); then I will get a Resource object pointing to E:/java/ding/asdf.txt
Create a project in eclipse
So, I'll be naming the project as spring1 since this is the first demo. Note that I haven't used STS (Spring Tool Suite) which most will probably be using. Rather, I have just downloaded the required jar files we need to create our project and included them in the library. Therefore, we will be carrying on creating a simple eclipse project and adding the necessary spring jars. I am using Eclipse KEPLER.- File -> New -> Project -> Java Project
- Give the project name spring28 and click Finish
- Now, the project is created.
- Under the Project Explorer (in the sidebar) you will see spring1. If you aren't able to see Project Explorer, go to Window menu -> Show view -> Project Explorer.
- Right click on the spring28 and click Properties
- On the left side, click on Java Build Path.
- Select the Libraries tab and then click on Add External Jars
- Now, add these jar files starting with: spring-beans, spring-context, spring-core, commons-logging
- Click on OK and then you are ready.
Project structure
SpringPrg.java - Main class
package spring28;
import java.io.InputStream;
import org.springframework.context.support.GenericXmlApplicationContext;
import org.springframework.core.io.Resource;
public class SpringPrg {
@SuppressWarnings("resource")
public static void main(String args[])
{
GenericXmlApplicationContext gc=new GenericXmlApplicationContext();
Resource r1=gc.getResource("classpath:resources/sample.txt");
Resource r2=gc.getResource("file:///e:/java/ascii.java");
displayInfo(r1);
displayInfo(r2);
}
public static void displayInfo(Resource r)
{
System.out.println("The file name is "+r.getFilename());
System.out.println("The description is "+r.getDescription());
try
{
System.out.println("The contents of the file is \n"+getContentAsString(r.getInputStream()));
}catch(Exception e){}
System.out.println("-------------------------------------");
}
public static String getContentAsString(InputStream is) throws Exception
{
StringBuffer sb=new StringBuffer();
int k;
while((k=is.read())!=-1)
{
sb.append((char)k);
}
return sb.toString();
}
}
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