错误！ “文件过早结束”

Question

我总共有3个文件如下

1. data.xml中
2. render.xslt
3. last.xslt

见图片http://i.imgur.com/BUNtY3D.png

我的第一个任务是将 data.xml 和 render.xslt 作为输入，在此之后将输出为 All.xml 给定的servlet将处理 All.xml 和 last.xslt 作为输入，这将为Http Request提供输出响应。

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

/**
 *
 * @author Shubham Dalal
 */
public class Manager extends HttpServlet {
    public void doGet(HttpServletRequest request,
        HttpServletResponse response)
    throws ServletException, IOException,
    java.net.MalformedURLException {

        // Tell the response object that our servlet returns HTML
        response.setContentType("text/html; charset=UTF-8");
        // Ask for a response stream
        PrintWriter output = response.getWriter();
        // This block tries to open our XML and XSLT files
        // which may throw an exception, thus the try..catch
        try {
            // Get a empty transform factory (factory pattern)
            TransformerFactory tFactory = TransformerFactory.newInstance();

            // Get the actual server path for XML and XSLT files
            String loc = getServletContext().getRealPath("") + "/";

            Source sdk2 = new StreamSource(
                new URL("file", "", loc + "full.xml").openStream());
            Source Main = new StreamSource(
                new URL("file", "", loc + "Main.xslt").openStream());
            // Generate the transformer
            Transformer Maintransformer = tFactory.newTransformer(Main);
            // GRAND FINALE!
            // Perform the transformation, send output to the browser
            Maintransformer.transform(sdk2, new StreamResult(output));

            // Get the XML input document and the stylesheet using
            // the string loc that holds the path information,
            // creating a JAXP Source instance
            Source sdk = new StreamSource(
                new URL("file", "", loc + "sdk.xml").openStream());
            Source list = new StreamSource(
                new URL("file", "", loc + "list.xsl").openStream());
            // Generate the transformer
            Transformer listtransformer = tFactory.newTransformer(list);
            listtransformer.transform(sdk, new StreamResult(new File("", loc + "full.xml")));

        } catch (Exception e) {
            output.write(e.getMessage());
            e.printStackTrace(output);
        }
        output.close();
    }
}

问题是我不知道如何在执行First任务的单个servlet中编写整个代码，然后处理第二个任务，即All.xml和last.xslt以提供html输出。

我是servlet的新手。

提前致谢。