struts2 action 返回图片流

 OutputStream out = null;
          try
          {
              String contenttype = "image/jpeg";
              ActionContext context = ActionContext.getContext();  
               // HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);  
                HttpServletResponse response = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);  
                
                response.setContentType(contenttype);               
                out = response.getOutputStream();                
           Statement stmt=con.createStatement();
           String sql="select top 1 zp from table_1 ";
           ResultSet rs=stmt.executeQuery(sql);
           //byte []by =rs.getBytes(0);
           while(rs.next()){
               out.write(rs.getBytes("ZP"));
           } 
          }
          catch(SQLException ee){
           
          }
          finally {
              out.flush();
                out.close();
          }        

<action name="bb" class="test.tt" method="getimage2">                              
        </action>

 <img name="inputName"  id="inputName" src="bb.action"/>