jsp頁面:

pageEncoding="utf-8"%>

Insert title here

下載index.jsp

下載1.jpg

下載test.jsp

Servlet:

packageorg.jimmy.testwebproject2019012602.servlet.download;importjava.io.FileInputStream;importjava.io.IOException;importjava.io.InputStream;importjavax.servlet.ServletException;importjavax.servlet.ServletOutputStream;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;/***@authorYang.Yuxin(Jimmy)

* @date 2019年2月14日 下午5:39:47

* @detail 下載Servlet*/

public class DownloadServlet extendsHttpServlet {private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {try{

request.setCharacterEncoding("utf-8");

response.setCharacterEncoding("utf-8");

String urlStr= request.getParameter("urlStr");

String fileName= urlStr.substring(urlStr.lastIndexOf("/") + 1);

response.setContentType("application/x-msdownload; charset=utf-8");

response.addHeader("Content-Disposition", "attachment; filename=" +fileName);//這個是使用項目的相對路徑來獲取文件的輸入流

InputStream is =request.getServletContext().getResourceAsStream(urlStr);/*//這個可以使用絕對路徑來獲取文件的輸入流

FileInputStream fis = new FileInputStream("D:\\Document\\201902\\20190228\\Test\\1.jpg");*/ServletOutputStream sos=response.getOutputStream();int fileLength =is.available();int cacheLength = 1024;if(fileLength

cacheLength=fileLength;

}int len =cacheLength;byte[] bytes = new byte[cacheLength];while((len = is.read(bytes, 0, len)) != -1) {

sos.write(bytes);

}

sos.flush();

sos.close();

is.close();

}catch(Exception e) {

e.printStackTrace();

}

}protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {

doGet(request, response);

}

}

總結

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