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我试图在java spring framework mvc中使用itext呈现pdf。 这是我的过滤器类。如何在使用iText生成PDF时摆脱异常
public class PdfFilter implements Filter, ApplicationContextAware {
@SuppressWarnings({ "UnusedDeclaration" })
private static final Logger log = Logger.getLogger(PdfFilter.class);
protected ApplicationContext applicationContext;
public void init(FilterConfig config) {
/* do nothing */
}
public void destroy() {
/* do nothing */
}
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) resp;
// Check to see if this filter should apply.
if (!"pdf".equals(request.getParameter("reportViewType"))) {
filterChain.doFilter(request, response);
return;
}
// Capture the content for this request
ContentCaptureServletResponse capContent = new ContentCaptureServletResponse(
response);
filterChain.doFilter(request, capContent);
response.setContentType("application/pdf; charset=UTF-8");
response.setHeader("Content-disposition",
"attachment; filename=\"report.pdf\"");
response.addHeader("Cache-Control", "-1");
try {
// Get the html content
String htmlContent = capContent.getHtlmContent();
PdfGenerator pdfGenerator = new PdfGenerator(
response.getOutputStream());
pdfGenerator.renderPdf(htmlContent, request, response);
} catch (Exception e) {
throw new ServletException(e);
}
}
public void setApplicationContext(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
}
，这里是我的pdfGenerator类 公共类的pdfGenerator { 私有静态最后记录器记录= Logger.getLogger（PdfGenerator.class）; private OutputStream outputStream;
public PdfGenerator(OutputStream os) {
this.outputStream = os;
}
public void renderPdf(String htmlContent, HttpServletRequest request,
HttpServletResponse response) throws Exception {
log.debug("renderPdf");
htmlContent = cleanUpHtml(htmlContent);
htmlContent = addHeadBodyTag(htmlContent);
htmlContent = addCss(htmlContent);
log.debug("convertToXhtml-e:");
OutputStream xhtmlOs = new ByteArrayOutputStream();
Tidy tidy = new Tidy();
tidy.setXHTML(true);
tidy.setCharEncoding(Configuration.UTF8);
tidy.parse(new ByteArrayInputStream(htmlContent.getBytes()), xhtmlOs);
xhtmlOs.flush();
xhtmlOs.close();
log.debug(xhtmlOs.toString());
StringReader contentReader = new StringReader(xhtmlOs.toString());
InputSource source = new InputSource(contentReader);
DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance()
.newDocumentBuilder();
// documentBuilder.setEntityResolver(new MyResolver(request));
documentBuilder.setEntityResolver(new NoOpEntityResolver());
Document xhtmlContent = documentBuilder.parse(source);
ITextRenderer renderer = new ITextRenderer();
renderer.setDocument(xhtmlContent, null);
renderer.layout();
renderer.createPDF(outputStream);
outputStream.close();
}
private String cleanUpHtml(String data) {
log.debug("cleanUpHtml-e:");
data = HtmlUtils.removeAllTags(data, "<script", "</script>", null);
data = HtmlUtils.replaceAll(data, "<a .*?>|</a>", "");
// data = HtmlUtils.replaceAll(data, "<img .*?>|</img>", "");
data = HtmlUtils.replaceAll(data, "<link .*?>", "");
// remove hidden field
data = HtmlUtils.replaceAll(data, "<input.*?type=['\"]hidden['\"].*?>",
"");
// remove pagination from lister
data = HtmlUtils
.replaceAll(
data,
"(<div style=\"top: .*?px; position: absolute;\" id=\"pager\" class=\"pager\".*?</div>)",
"");
return data;
}
private String addHeadBodyTag(String data) {
// data = "<html><head></head><body>" + data + "</body></html>";
return data;
}
private String addCss(String data) {
log.debug("addCss-e:");
return data;
}
private String addHead(String data, HttpServletRequest request) {
log.debug("addHeader-e:");
StringBuilder sb = new StringBuilder(500);
String header = sb.toString();
data = HtmlUtils.replaceAll(data, "(<body.*?>)", "$1" + header);
return data;
}
private String addFooter(String data) {
log.debug("addFooter-e:");
String footer = "iit lone gunmen 2.0";
data = HtmlUtils.replaceAll(data, "(<body.*?>)", "$1" + footer);
return data;
}
}
但不知何故，即时得到一些例外：
Jan 26, 2012 5:43:08 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/govForms] threw exception [Filter execution threw an exception] with root cause
java.lang.NoSuchMethodError: com.lowagie.text.Rectangle.getHeight()F
at org.xhtmlrenderer.pdf.ITextRenderer.writePDF(ITextRenderer.java:339)
at org.xhtmlrenderer.pdf.ITextRenderer.createPDF(ITextRenderer.java:315)
at org.xhtmlrenderer.pdf.ITextRenderer.createPDF(ITextRenderer.java:246)
at bd.gov.forms.web.pdf.PdfGenerator.renderPdf(PdfGenerator.java:64)
at bd.gov.forms.web.pdf.PdfFilter.doFilter(PdfFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:55)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
任何形式的帮助表示赞赏。 谢谢。
林不使用maven :(添加iText的 - 圣保罗 - 155.jar和Tidy.jar – rokonoid
你确定你正在使用的iText的正确版本，我可以看到的是，最新版本是5.1.3。？ - http://sourceforge.net/projects/itext/files/iText/iText5.1.3/。 我几乎可以肯定你正在使用旧的API，如果你正在学习一些教程，试着看看它是否是最新的-date。也许iText已经被扩展并随着时间的推移而增长了吗？我认为甚至软件包已经改变了（基于5.1.3 lib的内容），你将不得不升级到最新的版本 –
嗯，谢谢@ŁukaszBachman，Let我试试.. – rokonoid