hibernate和oracle关于图片的存储和读取

1:在applicationContext-*.xml的配置文件中

 <bean  id="nativeJdbcExtractor"  class="org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor" />
 <bean id="oracleLobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler" >
  <property name="nativeJdbcExtractor" ref="nativeJdbcExtractor"></property>
 </bean>

 
<bean id="lobHandler" lazy-init="true" class="org.springframework.jdbc.support.lob.DefaultLobHandler"/>

2:在sessionFactory Bean中

 <bean id="sessionFactory"
  class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
  <property name="configLocation">
   <value>classpath:hibernate.cfg.xml</value>
  </property>
   <property name="lobHandler">
          <ref bean="oracleLobHandler" />
     </property>
 </bean>

加入这个属性

  <property name="lobHandler">
          <ref bean="oracleLobHandler" />
     </property>
3:配置实体的hibernate的*.hbm.xml

   <property name="person18" type="org.springframework.orm.hibernate3.support.BlobByteArrayType" length="1048576000">
            <column name="PERSON18" />
        </property>

这个type是关键

在实体的 PERSON18 属性 的类型是byte[] ,配置基本结束

4:怎样存储呢?

这里是struts2+hibernate+spring 架构

在action中 private File[] upload; 这个upload其实就是jsp页面的上传<input type="file" name="upload"

在提交的时候 action中 开始把上传的图片set到实体的相关属性中去

 InputStream in = null;

 in = new BufferedInputStream(new FileInputStream(this.getUpload()[0]), BUFFER_SIZE);
                  byte[] buffer = new byte[BUFFER_SIZE];
                  in.read(buffer);

//把上传的图片set到 实体中去
                  person.setPerson18(buffer);

最好直接save实体就可以了

5:读取显示在页面

本人最初的想法是在action中把对象查出来,也就可以得到保存图片的byte[] ,然后放到request中,在页面直接读取,结果失败,

最后的解决办法是

jsp页面:

<img id="imgShow" width="100%" height="100%" src="imageAction.action?person01=${mk.person01}" alt="" /> 

 后台action中

public String loadImage() throws Exception{
  InputStream fileInput = null;
  String person01 = request.getParameter("person01");
  File dir = new File(ServletActionContext.getServletContext().getRealPath("")+  "/1.jpg");
  Person p = super.getPersonService().getPersonById(Integer.parseInt(person01));
  byte[] bs = p.getPerson18();
  
  if(bs == null){
    fileInput = new BufferedInputStream(new FileInputStream(dir), 100*1024);
   byte[] buffer = new byte[100*1024];
   int i = fileInput.read(buffer);
   upLoadImg(buffer);
      fileInput.close();
  }else{
   upLoadImg(bs);
  }
        return null;

/**
  * 上传图片
  * @param bs
  */
public void upLoadImg(byte[] bs){
 
 ServletOutputStream out = null;
    InputStream in = null;
    InputStream in2 = null;
    try {
         //二进制输出流
         response.setContentType("image/jpeg");
        
         //得到输出流
         out = response.getOutputStream();
        in =  new java.io.ByteArrayInputStream(bs);
         //强制刷新输出流
        out.write(bs);
        out.flush();
    } catch ( IOException e ) {
         e.printStackTrace();
    } catch ( Exception e ) {
         e.printStackTrace();
    } finally {
         if ( in != null ) {
              try {
                   in.close();
              } catch ( IOException e ) {
                   e.printStackTrace();
              }
         }
         if ( out != null ) try {
              out.close();
         } catch ( IOException e ) {
              e.printStackTrace();
         }
    }
}

这样就可以了

如有疑问:qq 331887602 最好发邮件哈 有现成的项目实例

转自:http://mamaoyuan625.iteye.com/blog/807451

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