response.java

在首次运行时

package htmlbrowser;

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

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()//发送请求资源
            throws IOException
    {
        byte[] bytes = new byte[BUFFER_SIZE];
        FileInputStream fis = null;
        try
        {

            File file = new File(HttpServer.WEB_ROOT, request.getUri());

            if (file.exists())
            {
                System.out.println("开始发送用户请求资源...");
                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);
                }
                System.out.println("发送完毕！");
            }
            else
            {
                System.out.println("用户请求的资源不存在");
                String errorMessage = "HTTP/1.1 404 File Not Found\r\n" +
                                      "Content-Type:text/html\r\n" +
                                      "\r\n" +
                                      "<hl>File Not Found</hl>";
                output.write(errorMessage.getBytes());
            }
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
            System.out.println("获取请求资源错误，请检查本地资源设置！");
            System.exit(1);
        }
        if (fis != null)
        {
            fis.close();
        }
    }

}