适合大学生做的兼职网站,网上在哪里打广告最有效,建设网站视频教程,视频直播app开发费用2019独角兽企业重金招聘Python工程师标准 废话少说代码伺候#xff1a; 封装好的ImageUtil类#xff1a;目的读取本地的图片文件并存入数据库#xff0c;然后读出数据库中以Blob形式存储的图片保存到指定目录。 1 package org.blog.util; 2 import java.io.F… 2019独角兽企业重金招聘Python工程师标准 废话少说代码伺候 封装好的ImageUtil类目的读取本地的图片文件并存入数据库然后读出数据库中以Blob形式存储的图片保存到指定目录。 1 package org.blog.util; 2 import java.io.File; 3 import java.io.FileInputStream; 4 import java.io.FileNotFoundException; 5 import java.io.FileOutputStream; 6 import java.io.IOException; 7 public class ImageUtil { 8 private static File file null ; 9 /* * 10 * 读取图像的二进制流 11 * 12 * param infile 13 * return 14 */ 15 public static FileInputStream getByteImage(String infile) { 16 FileInputStream inputImage null ; 17 file new File(infile); 18 try { 19 inputImage new FileInputStream(file); 20 } catch (FileNotFoundException e) { 21 e.printStackTrace(); 22 } 23 return inputImage; 24 } 25 /* * 26 * 输出图片 27 * param inputStream 28 * param path 29 */ 30 public static void readBlob(FileInputStream inputStream, String path) { 31 try { 32 FileOutputStream fileOutputStream new FileOutputStream(path); 33 byte [] buf new byte [ 1024 ]; 34 int len 0 ; 35 while ((len inputStream.read(buf)) ! - 1 ) { 36 fileOutputStream.write(buf, 0 , len); // 写 37 } 38 inputStream.close(); 39 fileOutputStream.close(); 40 } catch (FileNotFoundException e) { 41 e.printStackTrace(); 42 } catch (IOException e) { 43 e.printStackTrace(); 44 } 45 } 46 } 从数据库中读出二进制流显示到jsp页面 servlet源码 1 package servlet; 2 import java.io.ByteArrayInputStream; 3 import java.io.FileInputStream; 4 import java.io.IOException; 5 import java.io.InputStream; 6 import java.io.OutputStream; 7 import java.io.PrintWriter; 8 import java.sql.Blob; 9 import javax.servlet.ServletException; 10 import javax.servlet.ServletOutputStream; 11 import javax.servlet.http.HttpServlet; 12 import javax.servlet.http.HttpServletRequest; 13 import javax.servlet.http.HttpServletResponse; 14 import org.blog.util.ImageUtil; 15 import org.hibernate.Hibernate; 16 public class Image extends HttpServlet { 17 private static final long serialVersionUID 1L ; 18 Override 19 protected void doGet(HttpServletRequest req, HttpServletResponse resp) 20 throws ServletException, IOException { 21 this .doPost(req, resp); 22 } 23 Override 24 protected void doPost(HttpServletRequest req, HttpServletResponse resp) 25 throws ServletException, IOException { 26 try { 27 FileInputStream in ImageUtil.getByteImage( D:\\me.jpg ); 28 Blob blob Hibernate.createBlob( in ); 29 InputStream inputStream blob.getBinaryStream(); // IO流 30 int length ( int ) blob.length(); 31 byte [] b new byte [length]; 32 inputStream.read(b, 0 , length); 33 PrintWriter out resp.getWriter(); 34 InputStream is new ByteArrayInputStream(b); 35 int a is .read(); 36 while (a ! - 1 ) { 37 out .print(( char ) a); 38 a is .read(); 39 } 40 out .flush(); 41 out .close(); 42 /* OutputStream outputStream resp.getOutputStream();// 从response中获取getOutputStream 43 outputStream.write(b);// 写 44 inputStream.close(); 45 outputStream.close(); */ 46 } catch (Exception e) { 47 System. out .println( error ); 48 } 49 } 50 } jsp源码 1 % page language java import java.util.* pageEncoding UTF-8 % 2 % 3 String path request.getContextPath(); 4 String basePath request.getScheme() :// request.getServerName() : request.getServerPort() path / ; 5 % 6 ! DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN 7 html 8 head 9 base href %basePath% 10 11 title My JSP image.jsp starting page / title 12 13 meta http - equiv pragma content no-cache 14 meta http - equiv cache-control content no-cache 15 meta http - equiv expires content 0 16 meta http - equiv keywords content keyword1,keyword2,keyword3 17 meta http - equiv description content This is my page 18 !-- 19 link rel stylesheet type text/css href styles.css mce_href styles.css 20 -- 21 / head 22 23 body 24 div style border: solid red ; mce_style border: solid red ; img src image.do mce_src image.do / div 25 / body 26 / html 转载于:https://my.oschina.net/u/197668/blog/361218
