核心代碼

//設置響應內容類型為PDF類型
response.setContentType("application/pdf");                    
request.getRequestDispatcher("/WEB-INF/搜索框架.pdf").forward(request,response);

示例：

 1 import javax.servlet.ServletException;
 2 import javax.servlet.ServletOutputStream;
 3 import javax.servlet.annotation.WebServlet;
 
 4 import javax.servlet.http.HttpServlet;
 5 import javax.servlet.http.HttpServletRequest;
 6 import javax.servlet.http.HttpServletResponse;
 7 
 8 @WebServlet(value="/getFile")
 9 public class FilePage extends HttpServlet{
10 
11     @Override
12     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws
 
 ServletException, IOException {
13         processRequest(req, resp);
14     }
15     
16     
17     @Override
18     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
19         processRequest(req, resp);
20     }
21     
22     protected
 
 void processRequest(HttpServletRequest request, HttpServletResponse response)
23             throws ServletException, IOException{
24         
25         //設置響應內容類型為PDF類型
26         response.setContentType("application/pdf");                    
27         request.getRequestDispatcher("/WEB-INF/搜索框架.pdf").forward(request,response);
28         
29         
30     }
31 
32 
33 }

1. 如何用 servlet 打開非 HTML 格式的文檔（轉）

　　http://study.qqcf.com/web/598/149782.htm

2. 訪問WEB-INF目錄中的JSP文件

　　https://blog.csdn.net/zht666/article/details/8690669

Servlet | 訪問不同格式文件（PDF、doc）