java.net.CacheResponse Class in Java

CacheResponse is an abstract class that represents channels for retrieving resources from the ResponseCache. The objects of this class provide an InputStream that returns the entity-body and the associated response headers. This class inherits methods from java.lang.Object like as clone, equals, finalize, getClass(), hashCode(), notify(), notifyAll(), toString(), wait().

public abstract class CacheResponse  extends Object

Methods: CacheResponse class provides two methods which are as follows:

getBody() method
getHeaders() method

Method 1: getBody() method returns an InputStream from which the response body can be accessed.

Syntax:

public abstract InputStream getBody()  throws IOException

Parameters: NA

Return Type: This method returns the response body as an InputStream.

Exceptions: I/O Exception been thrown while getting response headers.

Implementation:

Example 1

Java

// Java Program to illustrate CacheResponse Class
// showcasing getBody() method
 
// Importing general class of exception
// produced by Interrupted I/O exception
import java.io.IOException;
// Importing superclass of all IO classes
import java.io.InputStream;
// Importing Cacheresponse class from java.net package
// to create an applet
import java.net.CacheResponse;
// Importing List and Map classes
// from java.util package
import java.util.List;
import java.util.Map;
 
// Main class
public class GFG {
 
    // Main driver method
    public static void main(String[] args)
        throws IOException
    {
 
        // Creating an object of CacheResponse class
        CacheResponse cr = new CacheResponse() {
            // getHeaders() method returns response headers
            // as Map
            public Map<String, List<String> > getHeaders()
                throws IOException
            {
 
                return null;
            }
 
            // getBody() method returns response body as
            // InputStream
            public InputStream getBody() throws IOException
            {
                System.out.println(
                    "getbody() has been tested");
                return null;
            }
        };
 
        // Returning an InputStream from which response body
        // can be accessed
        cr.getBody();
    }
}

Output

getbody() has been tested

Now illustrating another method as discussed earlier in the header

Method 2: getHeaders() method returns an immutable map from response header field names to lists of field values.

Syntax:

public abstract Map<String,List<String>> getHeaders()   throws IOException

Parameters: NA

Return Type: The response of the header as a Map.

Exceptions: I/O Exception been thrown while getting response headers.

Implementation:

Example 2

Java

// Java Program to illustrate CacheResponse Class
// showcasing getHeaders() method 
 
// Importing general class of exception 
// produced by Interrupted I/O exception
import java.io.IOException;
// Importing superclass of all IO classes  
import java.io.InputStream;  
// Importing Cacheresponse class from java.net package
// to create an applet
import java.net.CacheResponse; 
// Importing List, Linkedlist, Map, Tree, TreeMap classes 
// from java.util package  
import java.util.LinkedList;  
import java.util.List;  
import java.util.Map;  
import java.util.TreeMap;  
 
// Main class
// To illustrate getHeaders() method  
public class GFG {  
   
    // main driver method 
    public static void main(String[] args) throws IOException {
 
        // Creating an object of CacheResponse class  
        CacheResponse cr = new CacheResponse() {  
              
            // getHeaders() method returns response headers as Map
            public Map<String, List<String>> getHeaders() throws IOException {  
 
               // Creating an object of Map class
               // Object is of type- Integer and List<String>
               Map<Integer, List<String>> map = new TreeMap<Integer, List<String>>();  
                
               // Creating an object of List class
               List<String> list= new LinkedList<String>();  
                
               // Adding element to List object created  above
               // using add() method 
               list.add("GFG");  
               // Adding element to map object created above
               // using put() method 
               map.put(1,list); 
                 
                // Print Map class object element's
                System.out.println(map);  
                return null;  
            }  
            // getBody() method returns response body as InputStream
            public InputStream getBody() throws IOException {  
                return null;  
            }  
        };  
 
        // Returning an immutable Map from response header
        cr.getHeaders(); 
} 
}

Output

{1=[GFG]}

Java

Java

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