configparamservlet.java

来自「介绍了j2ee开发常用的学习知识,如servlet,javamail,EJB等知」· Java 代码 · 共 48 行

/*
 * ConfigParamServlet.java
 *
 * Created on 2007年10月16日, 上午10:25
 */

package com.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import javax.servlet.ServletOutputStream;
public class ConfigParamServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request,
            HttpServletResponse res) throws ServletException, IOException {
        res.setContentType( "application/pdf" );
        ServletOutputStream out =res.getOutputStream();
        File pdf =null;
        BufferedInputStream buf=null;
        //获取初始化参数
        String pdfDir = getInitParameter("FilePath");
        if (pdfDir == null || pdfDir.equals(""))
            throw new ServletException(
                    "Servlet parameters Wrongs");
        try{
            pdf=new File(pdfDir+"sample.pdf");
            res.setContentLength( (int) pdf.length( ) );
            FileInputStream input = new FileInputStream(pdf);
            buf = new BufferedInputStream(input);
            int readBytes = 0;
            while((readBytes = buf.read( )) != -1)
                out.write(readBytes);
        } catch(IOException e){
            System.out.println("file not found!");
        }finally {
           if (out != null)
                out.close( );
            if (buf != null)
                buf.close( );
        }
    }
}