response.java

jConfig,JAVA读取XML的开源项目

package org.jconfig.server;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.jconfig.utils.ResourceLocator;

/**
 * This class implements the Response for the configuration server.
 * It supposed to send back the configuration file. If the file
 * does not exist it will send back a HTTP 404
 *
 * @author Andreas Mecky [e-mail]
 * @author Terry Dye [e-mail]
 */
public class Response {
    
    private static final int BUFFER_SIZE = 1024;
    Request request;
    OutputStream output;
    
    public Response(OutputStream output) {
        this.output = output;
    }
    
    public void setRequest(Request request) {
        this.request = request;
    }
    
    public void sendStaticResource(String fileName) throws IOException {
        byte[] bytes = new byte[BUFFER_SIZE];
        FileInputStream fis = null;
        try {
            File file = new File(fileName);
            if (file.exists()) {
                fis = new FileInputStream(file);
                int ch = fis.read(bytes, 0, BUFFER_SIZE);
                while (ch!=-1) {
                    output.write(bytes, 0, ch);
                    ch = fis.read(bytes, 0, BUFFER_SIZE);
                }
            }
            else {
                System.out.println("Cannot find file:"+fileName);
                // file not found
                String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
                "Content-Type: text/html\r\n" +
                "Content-Length: 23\r\n" +
                "\r\n" +
                "<h1>File Not Found</h1>";
                output.write(errorMessage.getBytes());
            }
        }
        catch (Exception e) {
            // thrown if cannot instantiate a File object
            System.out.println(e.toString() );
        }
        finally {
            if (fis!=null)
                fis.close();
        }
    }
    
    public void sendStaticResource() throws IOException {
        byte[] bytes = new byte[BUFFER_SIZE];
        FileInputStream fis = null;
        String uri = request.getUri();
        if ( uri.startsWith("/") ) {
            uri = uri.substring(1);
        }
        uri += ".xml";
        try {
            //File file = new File(".", request.getUri());
            File file = new ResourceLocator(uri).getFile();
            if (file.exists()) {
                fis = new FileInputStream(file);
                int ch = fis.read(bytes, 0, BUFFER_SIZE);
                while (ch!=-1) {
                    output.write(bytes, 0, ch);
                    ch = fis.read(bytes, 0, BUFFER_SIZE);
                }
            }
            else {
                // file not found
                String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
                "Content-Type: text/html\r\n" +
                "Content-Length: 23\r\n" +
                "\r\n" +
                "<h1>File Not Found</h1>";
                output.write(errorMessage.getBytes());
            }
        }
        catch (Exception e) {
            // thrown if cannot instantiate a File object
            System.out.println(e.toString() );
        }
        finally {
            if (fis!=null)
                fis.close();
        }
    }
}