servlet+jasperReport，html预览图表不显示

出现原因主要是图片地址不正确。

如果servlet地址：http://localhost:8080/projectName/servlet/exportHtml

则访问图片的地址：http://localhost:8080/projectName/servlet/image?image=imgUrl

servlet方法需添加:

exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,"image?image=");

exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,Boolean.FALSE);

web_xml配置:

<servlet>

<servlet-name>ImageServlet</servlet-name>

<servlet-class>net.sf.jasperreports.j2ee.servlets.ImageServlet</servlet-class>

</servlet> 

<servlet-mapping>

<servlet-name>ImageServlet</servlet-name>

<url-pattern>/servlet/image</url-pattern>

</servlet-mapping>