{"id":274179,"date":"2024-05-16T13:57:19","date_gmt":"2024-05-16T05:57:19","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/274179.html"},"modified":"2024-05-16T13:57:24","modified_gmt":"2024-05-16T05:57:24","slug":"javaweb-%e9%a1%b9%e7%9b%ae-jsp-servlet-%e5%a6%82%e4%bd%95%e6%b7%bb%e5%8a%a0%e4%b8%80%e4%b8%aa%e4%b8%8b%e8%bd%bd%e7%9a%84%e6%8c%89%e9%92%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/274179.html","title":{"rendered":"javaweb \u9879\u76ee jsp servlet \u5982\u4f55\u6dfb\u52a0\u4e00\u4e2a\u4e0b\u8f7d\u7684\u6309\u94ae"},"content":{"rendered":"

\"javaweb<\/p>\n

JSP\u548cServlet\u6dfb\u52a0\u4e0b\u8f7d\u6309\u94ae<\/strong>\u7684\u8fc7\u7a0b\u6d89\u53ca\u5728JSP\u9875\u9762\u653e\u7f6e\u4e00\u4e2a\u4e0b\u8f7d\u94fe\u63a5\u6216\u6309\u94ae\u3001\u5728Servlet\u4e2d\u5904\u7406\u4e0b\u8f7d\u8bf7\u6c42\u3001\u8bbe\u7f6e\u54cd\u5e94\u5934\u4ee5\u4fbf\u6d4f\u89c8\u5668\u80fd\u8bc6\u522b\u5185\u5bb9\u7c7b\u578b\u5e76\u63d0\u793a\u4e0b\u8f7d\u3001\u4ee5\u53ca\u5b9e\u73b0\u6587\u4ef6\u7684\u8bfb\u53d6\u548c\u4f20\u8f93\u3002\u4e00\u79cd\u5e38\u89c1\u65b9\u5f0f\u662f\u901a\u8fc7Servlet\u8bfb\u53d6\u6307\u5b9a\u6587\u4ef6\uff0c\u7136\u540e\u901a\u8fc7\u8f93\u51fa\u6d41\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\uff0c\u540c\u65f6\u8bbe\u7f6e\u9002\u5f53\u7684\u54cd\u5e94\u5934\u786e\u4fdd\u6d4f\u89c8\u5668\u5c06\u54cd\u5e94\u4f5c\u4e3a\u6587\u4ef6\u4e0b\u8f7d\u6765\u5904\u7406\u3002<\/p>\n<\/p>\n

\u5728Servlet\u4e2d\u5904\u7406\u6587\u4ef6\u4e0b\u8f7d<\/strong>\u529f\u80fd\u65f6\uff0c\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u4e00\u70b9\u662f\u8bbe\u7f6e\u6b63\u786e\u7684\u5185\u5bb9\u7c7b\u578b\uff08Content-Type\uff09\u548c\u5185\u5bb9\u5904\u7f6e\uff08Content-Disposition\uff09\u3002\u8fd9\u51b3\u5b9a\u4e86\u6d4f\u89c8\u5668\u662f\u76f4\u63a5\u663e\u793a\u6587\u4ef6\u5185\u5bb9\uff0c\u8fd8\u662f\u63d0\u793a\u7528\u6237\u4e0b\u8f7d\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8ePDF\u6587\u4ef6\u6765\u8bf4\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u8bbe\u7f6e\u5185\u5bb9\u7c7b\u578b\u4e3aapplication\/pdf<\/code>\u3002\u800c\u5185\u5bb9\u5904\u7f6e\u4e00\u822c\u8bbe\u7f6e\u4e3aattachment; filename="filename.pdf"<\/code>\uff0c\u4ee5\u63d0\u793a\u6d4f\u89c8\u5668\u5c06\u54cd\u5e94\u4f5c\u4e3a\u9644\u4ef6\u5904\u7406\uff0c\u6587\u4ef6\u540d\u6307\u5b9a\u4e3a\u5ba2\u6237\u7aef\u5b58\u50a8\u6587\u4ef6\u65f6\u7684\u540d\u79f0\u3002<\/p>\n<\/p>\n

\n

\u4e00\u3001JSP\u9875\u9762\u6dfb\u52a0\u4e0b\u8f7d\u6309\u94ae<\/h2>\n<\/p>\n

\u5728JSP\u9875\u9762\u4e2d\uff0c\u4e0b\u8f7d\u6309\u94ae\u53ef\u4ee5\u662f\u4e00\u4e2aHTML\u6309\u94ae\uff0c\u94fe\u63a5\u5230\u4e00\u4e2aServlet URL\uff0c\u8be5Servlet\u8d1f\u8d23\u5904\u7406\u6587\u4ef6\u4e0b\u8f7d\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

<form method="GET" action="DownloadServlet"><\/p>\n
    <input type="submit" value="\u4e0b\u8f7d\u6587\u4ef6"\/><\/p>\n
<\/form><\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6216\u8005\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u94fe\u63a5\uff1a<\/p>\n<\/p>\n
<a href="DownloadServlet" target="_blank">\u4e0b\u8f7d\u6587\u4ef6<\/a><\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u521b\u5efa\u5904\u7406\u4e0b\u8f7d\u7684Servlet<\/h2>\n<\/p>\n
\u5728\u4e00\u4e2a\u65b0\u5efa\u7684Servlet\u4e2d\uff0c\u4f60\u9700\u8981\u91cd\u5199doGet<\/code>\u6216doPost<\/code>\u65b9\u6cd5\u6765\u5904\u7406\u6587\u4ef6\u4e0b\u8f7d\u8bf7\u6c42\u3002\u5728\u6b64\u65b9\u6cd5\u4e2d\uff0c\u7f16\u5199\u903b\u8f91\u4ece\u670d\u52a1\u5668\u6587\u4ef6\u7cfb\u7edf\u8bfb\u53d6\u6587\u4ef6\uff0c\u8bbe\u7f6e\u9002\u5f53\u7684\u54cd\u5e94\u5934\uff0c\u5e76\u5c06\u6587\u4ef6\u5185\u5bb9\u5199\u5165\u54cd\u5e94\u8f93\u51fa\u6d41\u3002<\/p>\n<\/p>\n
@WebServlet("\/DownloadServlet")<\/p>\n
public class DownloadServlet extends HttpServlet {<\/p>\n
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {<\/p>\n
        \/\/ \u6267\u884c\u4e0b\u8f7d\u903b\u8f91<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u8bbe\u7f6e\u54cd\u5e94\u5934<\/h2>\n<\/p>\n
\u5728Servlet\u7684\u4e0b\u8f7d\u65b9\u6cd5\u4e2d\uff0c\u9996\u5148\u8981\u8bbe\u7f6e\u54cd\u5e94\u7684\u5185\u5bb9\u7c7b\u578b\u548c\u5185\u5bb9\u5904\u7f6e\u5934\uff0c\u8fd9\u4e9b\u5934\u4fe1\u606f\u544a\u8bc9\u6d4f\u89c8\u5668\u5982\u4f55\u5904\u7406\u63a5\u6536\u5230\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
String filePath = "\/path\/to\/your\/file.pdf"; \/\/ \u6587\u4ef6\u8def\u5f84<\/p>\n
File downloadFile = new File(filePath);<\/p>\n
FileInputStream inStream = new FileInputStream(downloadFile);<\/p>\n
\/\/ MIME type of the file<\/p>\n
String mimeType = getServletContext().getMimeType(filePath);<\/p>\n
if (mimeType == null) {<\/p>\n
    \/\/ \u8bbe\u7f6e\u4e3a\u4e8c\u8fdb\u5236\u7c7b\u578b\uff0c\u8fd9\u662f\u5bf9\u672a\u77e5\u6587\u4ef6\u7c7b\u578b\u7684\u901a\u7528\u8bbe\u7f6e<\/p>\n
    mimeType = "application\/octet-stream";<\/p>\n
}<\/p>\n
response.setContentType(mimeType);<\/p>\n
\/\/ \u8bbe\u7f6e\u5185\u5bb9\u5c5e\u6027\u4ee5\u4f7f\u4e0b\u8f7d\u5de5\u4f5c<\/p>\n
response.setContentLength((int) downloadFile.length());<\/p>\n
String headerKey = "Content-Disposition";<\/p>\n
String headerValue = String.format("attachment; filename=\\"%s\\"", downloadFile.getName());<\/p>\n
response.setHeader(headerKey, headerValue);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u5b9e\u73b0\u6587\u4ef6\u4f20\u8f93<\/h2>\n<\/p>\n
\u6700\u540e\uff0c\u8bfb\u53d6\u6587\u4ef6\u5e76\u5199\u5165\u5230\u54cd\u5e94\u7684\u8f93\u51fa\u6d41\u3002\u8fd9\u9700\u8981\u5728try-catch\u5757\u4e2d\u5904\u7406\u5f02\u5e38\uff0c\u786e\u4fdd\u6587\u4ef6\u8f93\u5165\u548c\u8f93\u51fa\u6d41\u5728\u4f20\u8f93\u5b8c\u6210\u540e\u88ab\u5173\u95ed\u3002<\/p>\n<\/p>\n
\/\/ OutputStream \u521d\u59cb\u5316<\/p>\n
OutputStream outStream = response.getOutputStream();<\/p>\n
byte[] buffer = new byte[4096];<\/p>\n
int bytesRead = -1;<\/p>\n
\/\/ \u8bfb\u53d6\u6570\u636e\u5e76\u5199\u5165OutputStream<\/p>\n
while ((bytesRead = inStream.read(buffer)) != -1) {<\/p>\n
    outStream.write(buffer, 0, bytesRead);<\/p>\n
}<\/p>\n
inStream.close();<\/p>\n
outStream.close();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728Servlet\u4e2d\u5904\u7406\u6587\u4ef6\u4e0b\u8f7d\u65f6\u4fdd\u8bc1\u8bbe\u7f6e\u4e86\u5408\u9002\u7684\u54cd\u5e94\u5934\uff0c\u5c24\u5176\u662fContent-Disposition<\/code>\u975e\u5e38\u5173\u952e\uff0c\u56e0\u4e3a\u5b83\u544a\u8bc9\u6d4f\u89c8\u5668\uff0c\u54cd\u5e94\u5e94\u8be5\u88ab\u89c6\u4e3a\u4e00\u4e2a\u6587\u4ef6\u4e0b\u8f7d\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u5728\u6d4f\u89c8\u5668\u4e2d\u6253\u5f00\u3002\u8fd9\u901a\u5e38\u4f34\u968f\u7740filename<\/code>\u53c2\u6570\uff0c\u5b83\u5efa\u8bae\u4e86\u4fdd\u5b58\u6587\u4ef6\u65f6\u5e94\u4f7f\u7528\u7684\u9ed8\u8ba4\u540d\u79f0\u3002<\/p>\n<\/p>\n
\u4ee5\u4e0a\u6b65\u9aa4\u5b9e\u73b0\u4e86\u5728JavaWeb\u9879\u76ee\u4e2d\u57fa\u4e8eJSP\u548cServlet\u6280\u672f\u6dfb\u52a0\u4e0b\u8f7d\u6309\u94ae\u7684\u529f\u80fd\u3002\u5728\u7528\u6237\u70b9\u51fb\u4e0b\u8f7d\u6309\u94ae\u65f6\uff0c\u5c06\u7531\u4e00\u4e2a\u4e13\u95e8\u7684Servlet\u5904\u7406\u8bf7\u6c42\uff0c\u8bfb\u53d6\u670d\u52a1\u5668\u4e0a\u7684\u6587\u4ef6\uff0c\u5e76\u901a\u8fc7\u8bbe\u7f6e\u6b63\u786e\u7684\u54cd\u5e94\u5934\u4fe1\u606f\uff0c\u4f7f\u6d4f\u89c8\u5668\u63d0\u793a\u7528\u6237\u4e0b\u8f7d\u6587\u4ef6\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. \u5982\u4f55\u5728jsp\u9875\u9762\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u4e0b\u8f7d\u6309\u94ae\uff1f<\/strong><\/p>\n
\u5728jsp\u9875\u9762\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u4e0b\u8f7d\u6309\u94ae\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528HTML\u7684<a><\/code>\u6807\u7b7e\u6216\u8005<button><\/code>\u6807\u7b7e\u5b9e\u73b0\u3002\u9996\u5148\uff0c\u5728jsp\u9875\u9762\u4e2d\u627e\u5230\u4f60\u60f3\u8981\u6dfb\u52a0\u4e0b\u8f7d\u6309\u94ae\u7684\u4f4d\u7f6e\uff0c\u7136\u540e\u5728\u8be5\u4f4d\u7f6e\u63d2\u5165\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
<a href="your_file_path" download>\n  <button>\u4e0b\u8f7d<\/button>\n<\/a>\n<\/code><\/pre>\n
\u5c06your_file_path<\/code>\u66ff\u6362\u4e3a\u4f60\u8981\u7528\u6237\u4e0b\u8f7d\u7684\u6587\u4ef6\u7684\u8def\u5f84\u3002\u7528\u6237\u70b9\u51fb\u8be5\u4e0b\u8f7d\u6309\u94ae\u540e\uff0c\u6d4f\u89c8\u5668\u5c06\u81ea\u52a8\u4e0b\u8f7d\u8be5\u6587\u4ef6\u3002<\/p>\n
2. \u5982\u4f55\u5728servlet\u4e2d\u5b9e\u73b0\u6587\u4ef6\u4e0b\u8f7d\u529f\u80fd\uff1f<\/strong><\/p>\n
\u8981\u5728servlet\u4e2d\u5b9e\u73b0\u6587\u4ef6\u4e0b\u8f7d\u529f\u80fd\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528response<\/code>\u5bf9\u8c61\u7684\u4e00\u4e9b\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002\u9996\u5148\uff0c\u5728servlet\u4ee3\u7801\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\uff0c\u7528\u4e8e\u8bbe\u7f6e\u54cd\u5e94\u5934\u548c\u6587\u4ef6\u540d\uff1a<\/p>\n
String fileName = "your_file_name.extension"; \/\/ \u66ff\u6362\u4e3a\u4f60\u8981\u4e0b\u8f7d\u7684\u6587\u4ef6\u540d\nString filePath = "your_file_path"; \/\/ \u66ff\u6362\u4e3a\u4f60\u8981\u4e0b\u8f7d\u7684\u6587\u4ef6\u8def\u5f84\nresponse.setContentType("application\/octet-stream");\nresponse.setHeader("Content-Disposition", "attachment; filename=\\"" + fileName + "\\"");\n<\/code><\/pre>\n
\u7136\u540e\uff0c\u4f60\u9700\u8981\u521b\u5efa\u4e00\u4e2aFile<\/code>\u5bf9\u8c61\u4ee5\u8bbf\u95ee\u6587\u4ef6\uff0c\u5e76\u5c06\u6587\u4ef6\u5185\u5bb9\u5199\u5165\u54cd\u5e94\u8f93\u51fa\u6d41\uff1a<\/p>\n
File file = new File(filePath);\ntry (FileInputStream fileInputStream = new FileInputStream(file);\n     OutputStream outputStream = response.getOutputStream()) {\n    byte[] buffer = new byte[4096];\n    int bytesRead;\n    while ((bytesRead = fileInputStream.read(buffer)) != -1) {\n        outputStream.write(buffer, 0, bytesRead);\n    }\n}\n<\/code><\/pre>\n
\u8fd9\u6837\uff0c\u5f53\u7528\u6237\u8bbf\u95ee\u8be5servlet\u65f6\uff0c\u5c06\u4f1a\u81ea\u52a8\u4e0b\u8f7d\u8be5\u6587\u4ef6\u3002<\/p>\n
3. \u5982\u4f55\u8ba9\u7528\u6237\u4e0b\u8f7d\u670d\u52a1\u5668\u4e0a\u7684\u6587\u4ef6\uff1f<\/strong><\/p>\n
\u8981\u8ba9\u7528\u6237\u4e0b\u8f7d\u670d\u52a1\u5668\u4e0a\u7684\u6587\u4ef6\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u7edd\u5bf9\u8def\u5f84\u6216\u76f8\u5bf9\u8def\u5f84\u6765\u5f15\u7528\u8be5\u6587\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6b65\u9aa4\uff0c\u5e2e\u52a9\u4f60\u5b9e\u73b0\u8be5\u529f\u80fd\uff1a<\/p>\n
    \n
  1. \u786e\u4fdd\u670d\u52a1\u5668\u4e0a\u7684\u6587\u4ef6\u662f\u53ef\u88ab\u516c\u5f00\u8bbf\u95ee\u7684\u3002\u4f60\u53ef\u4ee5\u5c06\u6587\u4ef6\u653e\u5728Web\u5e94\u7528\u7a0b\u5e8f\u7684\u67d0\u4e2a\u516c\u5f00\u76ee\u5f55\u4e2d\uff0c\u6216\u8005\u901a\u8fc7\u914d\u7f6e\u670d\u52a1\u5668\u7684\u8bbf\u95ee\u6743\u9650\u6765\u786e\u4fdd\u6587\u4ef6\u53ef\u4ee5\u88ab\u8bbf\u95ee\u3002<\/li>\n
  2. \u5728\u4f60\u7684\u7f51\u9875\u6216\u5e94\u7528\u7a0b\u5e8f\u4e2d\u521b\u5efa\u4e00\u4e2a\u4e0b\u8f7d\u94fe\u63a5\u6216\u6309\u94ae\uff0c\u5e76\u8bbe\u7f6e\u8be5\u94fe\u63a5\u6216\u6309\u94ae\u7684href\u6216action\u5c5e\u6027\u4e3a\u6587\u4ef6\u7684URL\u3002\u4f8b\u5982\uff1a<a href="http:\/\/your_server_url\/your_file_path">\u4e0b\u8f7d\u6587\u4ef6<\/a><\/code>\u3002<\/li>\n
  3. \u5f53\u7528\u6237\u70b9\u51fb\u4e0b\u8f7d\u94fe\u63a5\u6216\u6309\u94ae\u65f6\uff0c\u6d4f\u89c8\u5668\u5c06\u6839\u636e\u63d0\u4f9b\u7684URL\u53d1\u9001\u4e00\u4e2aHTTP\u8bf7\u6c42\uff0c\u670d\u52a1\u5668\u5c06\u4f1a\u8fd4\u56de\u8be5\u6587\u4ef6\u7684\u5185\u5bb9\u3002<\/li>\n
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