浏览器下载 根目录下的PDF文件， 流的使用

package com.Text;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.core.io.ClassPathResource;

public class outPdf {

    public void outPut(HttpServletRequest request, HttpServletResponse response, Integer type) {
        ClassPathResource classPathResource = new ClassPathResource("pdf/通知.pdf");
        String filename = "通知.pdf";
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        try {
            String userAgent = request.getHeader("User-Agent");
            response.setCharacterEncoding("utf-8");
            byte[] bytes = userAgent.contains("MSIE") ? filename.getBytes() : filename.getBytes("UTF-8");
            response.setContentType("application/pdf");
            response.addHeader("Content-Disposition",
                    "attachment;filename=" + new String(bytes, "iso8859-1"));
            bufferedInputStream = new BufferedInputStream(classPathResource.getInputStream());
            //bufferedOutputStream = new BufferedOutputStream(response.getOutputStream());
            byte[] bytes2 = new byte[1024];
            int i = 0;
            while ((i = bufferedInputStream.read(bytes2)) != -1){
                response.getOutputStream().write(bytes2, 0, i);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                response.getOutputStream().flush();
                response.getOutputStream().close();
                //bufferedOutputStream.close();
                bufferedInputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    
    //使用BufferedInputStream和BufferedOuputStream读写图片
     public static void main(String[] args) throws Exception {  
            // 指定要读取文件的缓冲输入字节流  
            BufferedInputStream in = new BufferedInputStream(new FileInputStream("F:\\test.jpg"));  
            File file = new File("E:\\test.jpg");  
            if (file != null) {  
                file.createNewFile();  
            }  
            // 指定要写入文件的缓冲输出字节流  
            BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(file));  
            byte[] bb = new byte[1024];// 用来存储每次读取到的字节数组  
            int n;// 每次读取到的字节数组的长度  
            while ((n = in.read(bb)) != -1) {  
                out.write(bb, 0, n);// 写入到输出流  
            }  
            out.close();// 关闭流  
            in.close();  
        }  
    
    
    
    
}

转载（https://www.cnblogs.com/prader6/p/12054394.html）