ssh框架向數據庫添加blob圖片以及在jsp中顯示blob圖片

圖片類：picture.java

public class Picture implements java.io.Serializable {
    private String pictureid; 
    private String picversion;
    private String kind; //圖片類型：光學圖片、遙感圖片等
    private byte[] picture; //圖片字節數組
    ……

hibernate文件：

<hibernate-mapping>
    <class name="org.military.po.Picture" table="picture" schema="MilitaryMS">
        <id name="pictureid" type="string">
            <column name="pictureid" length="100" />
            <generator class="assigned" />
        </id>
        <property name="picversion" type="string">
            <column name="picversion" length="100" not-null="true" />
        </property>
        <property name="kind" type="string">
            <column name="kind" length="50" not-null="true" />
        </property>
        <property name="picture" type="binary">
            <column name="picture" />
        </property>
    </class>
</hibernate-mapping>

實現功能將指定目錄下的圖片保存到數據庫中，關鍵代碼：
所有的圖片路徑都存放在session參數imagesPath中，依次取出所有路徑，將該路徑下的文件保存入數據庫中。

Map<String,String> imagesPath=(HashMap<String,String>) ActionContext.getContext().getSession().get("imagesPath");
Iterator itr= imagesPath.entrySet().iterator();
while(itr.hasNext()){
    Map.Entry<String,String> entry=(Entry<String, String>) itr.next();
    String imagepath=entry.getKey();
    String type=entry.getValue();
    FileInputStream fin;    
    byte[] buffer=new byte[1024];
    int len=0;
    try {           
        fin=new FileInputStream(imagepath);             
        ByteArrayOutputStream fos=new ByteArrayOutputStream();
        while((len=fin.read(buffer))!=-1){
            fos.write(buffer, 0, len);
        }
        pictureService.savePicture(new Picture(imagepath,shipversion,type,fos.toByteArray()));
    } catch (IOException e) {
            e.printStackTrace();
    }
}

在jsp中顯示圖片
jsp頁面顯示

<img data-src= "holder.js/300x200" src= '<%=path%>/imageShowAction?version= <s:property value= "version" /> ' onError= "this.src='./image/nopic.jpg'" alt= "Generic placeholder thumbnail" style=" width: 330px; height : 220px;">

struts配置文件：

<action name= "imageShowAction" class ="imageUploadAction"  method= "showImage">
      <result name= "null" type ="stream">
           <param name="contentType" >image/ jpeg,image/bmp ,image/png,image/ gif,image/jpeg ,image/pjpeg</param >
      </result>
</action>

注意其中的name必須爲null。
action類：

public class ImageUploadAction extends ActionSupport
      {
        private PictureService pictureService ;
        private String version ;
        private HttpServletResponse response ;
        private ServletOutputStream sout ;//二進制流可以直接在 jsp頁面顯示  
       get和set函數……

       public String showImage() {
               Picture picture = pictureService.queryOnePicByVersion(version );
               byte[] pic=null ;
               if(picture!=null){
                      pic=picture.getPicture();
                      response=ServletActionContext. getResponse();
                      response.setContentType( "image/jpeg");   
                      try {
                            sout= this.response .getOutputStream();                  
                            sout.write(pic,0,pic. length);            
                            sout.flush();
                            sout.close();
                     } catch (IOException e) {
                            // TODO Auto-generated catch block
                           e.printStackTrace();
                     }
              }
       return null ;
       }       
}

注意該處的返回值爲null。對應配置文件中的name=“null”