如何使用servlet和JSP显示PDF文件? [英] How do I display a PDF file using servlets and JSP?

问题描述

谁能告诉我如何使用servlet和JSP显示存储在我的数据库中的PDF文件?是否有要导入的特定jar文件?

Can anyone tell how to display a PDF file which is stored in my database using servlets and JSP? Are there any specific jar files to be imported?

推荐答案

只需从数据库中以InputStream的形式获取它，然后将其沿着正确的标头集写入响应的OutputStream中即可.这是一个片段，假设您正在使用JDBC与DB进行交互.

Just get it as InputStream from DB and write it to OutputStream of the response along a correct set of headers. Here's a snippet assuming you're using JDBC to interact with DB.

response.setContentType("application/pdf");
// ...
InputStream input = resultSet.getBinaryStream("columnname");
OutputStream output = response.getOutputStream();
// Write input to output the usual way.
// ...

当映射到例如/pdfservlet的url-pattern时，则可以使用<a>链接

When mapped on an url-pattern of for example /pdfservlet, then you can just call the servlet using <a> link

<a href="pdfservlet?id=123">click here</a>

或<object>(如果要将其嵌入HTML中).

or by <object> if you want to embed it in HTML.

<object data="pdfservlet?id=123" type="application/pdf" width="600" height="400">
</object>

您不需要任何其他库.完整的启动示例可以在此处找到.

You don't need any additional libraries. A complete kickoff example can be found here.

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