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如何使用Hibernate将图像保存到mysql数据库

[英]How to save images to mysql database using Hibernate

 原文  2015-01-07 05:04:11  0   2    java/ hibernate

问题描述

我正在做一个需要上传大量图像的项目，但是我不知道图像上传的实际过程。 我正在使用没有Spring MVC的Hibernate 3。 所有页面都是JSP页面。 主要问题是如何从请求中获取图像并将其保存到数据库。 我已经解析了请求并获取了所有参数值，这些值是表单字段。 我应该为图像文件做什么？？

2 个解决方案

解决方案1
 0  2015-01-07 05:10:09

要将图像保存到数据库中，您需要将表列定义为MySQL中的blob数据类型，或其他数据库中的等效二进制类型。 在Hibernate端，您可以声明一个字节数组变量来存储图像数据。

解决方案2
 0  2018-12-17 05:41:15

首先，您需要下载以下jar文件：-
1）commons-fileupload-1.3.3
2）commons-fileupload-1.3.3-javadoc
3）commons-fileupload-1.3.3-源
4）commons-fileupload-1.3.3-测试
5）commons-fileupload-1.3.3-test-sources
6）commons-io-2.5
7）commons-io-2.5-javadoc
和休眠jar文件
您还必须设置项目的路径以在Web浏览器上显示图像：-
右键单击项目->属性->复制完整位置->打开web.xml

web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>imghib</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <context-param> 
   <description>Location to store uploaded file</description> 
   <param-name>file-upload</param-name> 
   <param-value>
      C:\Users\mohammed lala\mdlala\imghib\webContent\
   </param-value> 
</context-param>
</web-app>

index.html 

 <html>
       <head>
          <title>File Uploading Form</title>
       </head>

       <body>
          <h3>File Upload:</h3>
          Select a file to upload: <br />
          <form action = "UploadServlet.jsp" method = "post"
             enctype = "multipart/form-data">
             <input type = "file" name = "file" size = "50" />
             <br />
             <input type = "submit" value = "Upload File" />
          </form>
       </body>
    </html>

UploadServlet.jsp 

<%@page import="org.hibernate.cfg.AnnotationConfiguration"%>
    <%@page import="img.Image"%>
    <%@page import="org.hibernate.Transaction"%>
    <%@page import="org.hibernate.Session"%>
    <%@ page import = "java.io.*,java.util.*, javax.servlet.*" %>
    <%@ page import = "javax.servlet.http.*" %>
    <%@ page import = "org.apache.commons.fileupload.*" %>
    <%@ page import = "org.apache.commons.fileupload.disk.*" %>
    <%@ page import = "org.apache.commons.fileupload.servlet.*" %>
    <%@ page import = "org.apache.commons.io.output.*" %>

    <%
        Session s=new AnnotationConfiguration().configure().buildSessionFactory().openSession();
        Transaction tx=s.beginTransaction();
       File file ;
       int maxFileSize = 5000 * 1024;
       int maxMemSize = 5000 * 1024;
       ServletContext context = pageContext.getServletContext();
       String filePath = context.getInitParameter("file-upload");

       // Verify the content type
       String contentType = request.getContentType();

       if ((contentType.indexOf("multipart/form-data") >= 0)) {
          DiskFileItemFactory factory = new DiskFileItemFactory();
          // maximum size that will be stored in memory
          factory.setSizeThreshold(maxMemSize);

          // Location to save data that is larger than maxMemSize.
          factory.setRepository(new File("c:\\temp"));

          // Create a new file upload handler
          ServletFileUpload upload = new ServletFileUpload(factory);

          // maximum file size to be uploaded.
          upload.setSizeMax( maxFileSize );

          try { 
             // Parse the request to get file items.
             List fileItems = upload.parseRequest(request);

             // Process the uploaded file items
             Iterator i = fileItems.iterator();

             out.println("<html>");
             out.println("<head>");
             out.println("<title>JSP File upload</title>");  
             out.println("</head>");
             out.println("<body>");

             while ( i.hasNext () ) {
                FileItem fi = (FileItem)i.next();
                if ( !fi.isFormField () ) {
                   // Get the uploaded file parameters
                   String fieldName = fi.getFieldName();
                   String fileName = fi.getName();
                   boolean isInMemory = fi.isInMemory();
                   long sizeInBytes = fi.getSize();

                   // Write the file
                   if( fileName.lastIndexOf("\\") >= 0 ) {
                      file = new File( filePath + 
                      fileName.substring( fileName.lastIndexOf("\\"))) ;
                   } else {
                      file = new File( filePath + 
                      fileName.substring(fileName.lastIndexOf("\\")+1)) ;
                   }
                   fi.write( file ) ;
                   out.println("Uploaded Filename: " + filePath + 
                   fileName + "<br>");
                   Image ig=new Image();
                   ig.setFileName(fileName);
                   s.saveOrUpdate(ig);
                   tx.commit();
                   s.close();
                   response.sendRedirect("show.jsp?name="+fileName+" ");
                }
             }
             out.println("</body>");
             out.println("</html>");
          } catch(Exception ex) {
             System.out.println(ex);
          }
       } else {
          out.println("<html>");
          out.println("<head>");
          out.println("<title>Servlet upload</title>");  
          out.println("</head>");
          out.println("<body>");
          out.println("<p>No file uploaded</p>"); 
          out.println("</body>");
          out.println("</html>");
       }
    %>

show.jsp 

 <%
    String name=request.getParameter("name");
    out.print(name);
    %>
    <img src="<%=name %>">

图像.java 

package img;

    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.Table;

    @Entity
    @Table(name="image")
    public class Image {
        @Id
        @GeneratedValue
        private int id;
        private String fileName;
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getFileName() {
            return fileName;
        }

        public void setFileName(String fileName) {
            this.fileName = fileName;
        }
    }

hibernate.cfg.xml 

 <?xml version='1.0' encoding='UTF-8'?>
    <!DOCTYPE hibernate-configuration PUBLIC
              "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
              "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

    <hibernate-configuration>
    <session-factory>
        <property name="connection.url">
            jdbc:mysql://localhost:3306/db_name
        </property>
        <property name="connection.username">root</property>
        <property name="connection.password">scott</property>
        <property name="connection.driver_class">
            com.mysql.jdbc.Driver
        </property>
        <property name="dialect">
            org.hibernate.dialect.MySQLDialect
        </property>
         <property name="hbm2ddl.auto">update</property>


         <mapping class="img.Image"></mapping>
    </session-factory>
    </hibernate-configuration>

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