initparamservlet.java

servlet初学者最好的例子……希望能对大家有所帮助

package servlet;

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

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class InitParamServlet extends HttpServlet {
    ServletConfig myConfig;
    public void init(ServletConfig config) throws ServletException
    {	
    		super.init(config);
    		myConfig=config;
    }
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("application/pdf");
		ServletOutputStream sout=response.getOutputStream();
		//response.setHeader("Content-disposition","attachment;filename=test1.pdf"); //不在浏览器内打开，单独保存
        File pdf=null;
        BufferedInputStream buf=null;
        String pdfDir=myConfig.getInitParameter("FilePath");
        if(pdfDir==null || pdfDir.equals(""))
        {
        	throw new ServletException("Servlet parameters Wrongs");
        }
        try
        {
        	pdf=new File(pdfDir+"test.pdf");
        	response.setContentLength((int)pdf.length());
        	FileInputStream input=new FileInputStream(pdf);
        	buf=new BufferedInputStream(input);
        	int readBytes=0;
        	while((readBytes=buf.read())!=-1)
        		sout.write(readBytes);
        }catch(IOException e)
        {
        	System.out.println("File not found!");
        }finally{
        	if(sout!=null)
        		sout.close();
        	if(buf!=null)
        		buf.close();
        }

	}

}