如何在Java Web应用程序中将byte []作为pdf发送到浏览器？

在action方法中，您可以通过JSF幕后获得HTTP
servlet响应

ExternalContext#getResponse()

Content-Type

application/pdf

Content-Disposition

attachment

inline

FacesContext#responseComplete()

IllegalStateException

开球示例：

public void download() throws IOException {    // Prepare.    byte[] pdfData = getItSomehow();    FacesContext facesContext = FacesContext.getCurrentInstance();    ExternalContext externalContext = facesContext.getExternalContext();    HttpServletResponse response = (HttpServletResponse) externalContext.getResponse();    // Initialize response.    response.reset(); // Some JSF component library or some Filter might have set some headers in the buffer beforehand. We want to get rid of them, else it may collide.    response.setContentType("application/pdf"); // Check http://www.iana.org/assignments/media-types for all types. Use if necessary ServletContext#getMimeType() for auto-detection based on filename.    response.setHeader("Content-disposition", "attachment; filename="name.pdf""); // The Save As popup magic is done here. You can give it any filename you want, this only won't work in MSIE, it will use current request URL as filename instead.    // Write file to response.    OutputStream output = response.getOutputStream();    output.write(pdfData);    output.close();    // Inform JSF to not take the response in hands.    facesContext.responseComplete(); // important! Else JSF will attempt to render the response which obviously will fail since it's already written with a file and closed.}

就是说，如果您有可能将PDF内容作为

InputStream

byte[]

InputStream

OutputStream