JSONConverver.java

package sample;

import io.undertow.server.HttpServerExchange;
import java.io.IOException;
import java.io.Reader;
import java.nio.channels.Channels;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JSONConverver {

    final ObjectMapper mapper = new ObjectMapper();
    
    public <T> T convert( 
            final HttpServerExchange exchange, final Class<T> targetClass ) throw IOException {
        return convert( exchange, targetClass, "UTF-8" );
    }

    public <T> T convert( 
            final HttpServerExchange exchange, final Class<T> targetClass,
            final String contentEncoding ) throw IOException {
        final Reader reader = Channels.newReader( exchange.getRequestChannel(), contentEncoding );
        return mapper.readValue(input, targetClass);
    }
}