java以Blob形式存储，读取图片并在jsp页面显示图片流

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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

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