我希望将 PDF 文档从数据库显示到浏览器，我希望浏览器打开它，但如果它提示下载它也可以。我知道这个问题已经在这里和其他论坛被问过，但我仍然没有完成这项任务。
我看过这些： JSP n Servlets Display PDF via JSP n Servlet tutorial
我当前的代码。
对象/实体：``
public class Attach
{
private String filename = null;
private InputStream attach = null;
private int ContentLength = 0;
public String getFilename() {
return filename;
}
public void setFilename(String filename) {
this.filename = filename;
}
public InputStream getAttach() {
return attach;
}
public void setAttach(InputStream attach) {
this.attach = attach;
}
public int getContentLength() {
return ContentLength;
}
public void setContentLength(int contentLength) {
ContentLength = contentLength;
}
public Attach() {
}
public Attach(String filename, InputStream attach) {
this.attach = attach;
this.filename = filename;
}
}
从数据库中检索 PDF 的方法：
public Attach getPDFData(String filename) {
try {
pstmt = conn.prepareStatement("SELECT * FROM FUNC_AREA WHERE FILE_NME = ?");
pstmt.setString(1, filename);
rs = pstmt.executeQuery();
if (rs.next()) {
newattach.setFilename(rs.getString(3));
newattach.setAttach(rs.getBinaryStream(5));
}
} catch (SQLException e) {
e.printStackTrace();
}
return newattach;
}
我的小服务程序：
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
showAttach(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
showAttach(request, response);
}
public void showAttach(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
RepoOperations repops = new RepoOperations();
Attach newattachobj = repops.getPDFData("bond.pdf");
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int inputStreamLength = 0;
int length = 0;
while ((length = newattachobj.getAttach().read(buffer)) > 0) {
inputStreamLength += length;
baos.write(buffer, 0, length);
}
if (inputStreamLength > newattachobj.getContentLength()) {
newattachobj.setContentLength(inputStreamLength);
}
if (response instanceof HttpServletResponse) {
HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.reset();
httpResponse.setHeader("Content-Type", "application/pdf");
httpResponse.setHeader("Content-Length", String.valueOf(newattachobj.getContentLength()));
httpResponse.setHeader("Content-Disposition", "inline; filename=\"" + newattachobj.getFilename() + "\"");
}
response.getOutputStream().write(baos.toByteArray(), 0, (int)newattachobj.getContentLength());
//finally
response.getOutputStream().flush();
//clear
baos = null;
System.out.println(newattachobj.getFilename());
} finally {
// TODO Auto-generated catch block
close(response.getOutputStream());
close(newattachobj.getAttach());
}
}
private void close(Closeable resource) throws IOException {
if (resource != null) {
resource.close();
}
}
JSP：
<form action="ShowAttach">
<a href="ShowAttach">click here</a>
<br/>
<input type="submit" value="submit" id="submit">
</form>
我希望在 JSP 页面上有一个超链接来打开 PDF 文档。谢谢你
问题是当我单击 JSP 页面上的按钮时，它给了我一个 404 错误。