【jsp】读取WebRoot下的图像文件

package readPic;



import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



public class ReadPic extends HttpServlet{

    

    /**

     * 

     */

    private static final long serialVersionUID = 1L;



    public void doGet(HttpServletRequest req,HttpServletResponse resp)

    throws IOException,ServletException{

        resp.setHeader("content-type","image/jpeg");

        

        InputStream in=this.getServletContext().getResourceAsStream("1.jpg");

        //1.jpg 放在WebRoot根目录下

        

        int len=0;

        byte buffer[]=new byte[1024];

        

        OutputStream out=resp.getOutputStream();

        while( (len=in.read(buffer)) > 0){

            out.write(buffer,0,len);

        }

    }

}