循环执行下面的代码时

ImageInfo image = imgService.findEntityById(ImageInfo.class, id);

InputStream is = null;

        Blob img = image.getImg();

        try {

            if(img != null){

                is = img.getBinaryStream();

            }

        } catch (SQLException e) {

            e.printStackTrace();

        }

        if (is != null) {

            int len = 0;

            byte[] buffer = new byte[1024];

            HttpServletResponse response = this.getResponse();

            OutputStream out = response.getOutputStream();

            while ((len = is.read(buffer)) != -1) {

                out.write(buffer, 0, len);

            }

            out.flush();

            out.close();

            response.flushBuffer();

            is.close();

        }

出现异常







java.sql.SQLException: 关闭的连接

	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)

	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)

	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208)

	at oracle.sql.BLOB.getDBAccess(BLOB.java:955)

	at oracle.sql.BLOB.getBinaryStream(BLOB.java:229)

	at sun.reflect.GeneratedMethodAccessor333.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

	at java.lang.reflect.Method.invoke(Method.java:597)

	at org.hibernate.engine.jdbc.SerializableBlobProxy.invoke(SerializableBlobProxy.java:74)

	at $Proxy1070.getBinaryStream(Unknown Source)

	at com.hzfc.soar.lsjz.jd.action.ZlAction.writeImg(ZlAction.java:194)

	at sun.reflect.GeneratedMethodAccessor379.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

	at java.lang.reflect.Method.invoke(Method.java:597)

	at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:358)

	at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:218)

	at com.opensy