Glassfish 似乎也为我想保存图像文件的路径添加了额外的内容,有没有办法只使用我的 servlet 获得的绝对路径
String appPath = request.getServletContext().getRealPath("");
?
我花了几天时间尝试不同的方法来上传图像文件并让 servlet 将其保存到磁盘。
我用了这个例子: http: //www.codejava.net/java-ee/servlet/how-to-write-upload-file-servlet-with-servlet-30-api
使用调试我可以看到正确收集了文件名和路径信息,但代码在 `part.write(savePath + File.separator + fileName);` 处失败
glassfish的异常报告是:
exception
java.io.FileNotFoundException: C:\Program Files\glassfish-3.1.2.2\glassfish\domains\domain1\generated\jsp\com.onemore_onemore-web_war_1.0-SNAPSHOT\D:\Dropbox\Git\Brian_JEE\onemore\onemore\onemore-web\target\onemore-web-1.0-SNAPSHOT\image\screengrab_all_products.jpg (The filename, directory name, or volume label syntax is incorrect)
作为此异常的一部分,我可以看到正确的路径D:\Dropbox\Git\Brian_JEE\onemore\onemore\onemore-web\target\onemore-web-1.0-SNAPSHOT\image\screengrab_all_products.jpg
JSP
<form action="${pageContext.request.contextPath}/imageupload" method="post" enctype="multipart/form-data" name="productForm" id="productForm">
<input type="file" name="file" id="file">
<input type="submit" name="Submit" value="Submit"></td>
</form>
小服务程序
@WebServlet(name = "UploadImageServlet", urlPatterns = {"/imageupload"})
@MultipartConfig(fileSizeThreshold = 1024 * 1024 * 2, // 2MB
maxFileSize = 1024 * 1024 * 10, // 10MB
maxRequestSize = 1024 * 1024 * 50) // 50MB
public class UploadImageServlet extends HttpServlet {
/**
* Name of the directory where uploaded files will be saved, relative to the
* web application directory.
*/
private static final String SAVE_DIR = "image";
/**
* handles file upload
*/
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// gets absolute path of the web application
String appPath = request.getServletContext().getRealPath("");
// constructs path of the directory to save uploaded file
String savePath = appPath + File.separator + SAVE_DIR;
// creates the save directory if it does not exists
File fileSaveDir = new File(savePath);
if (!fileSaveDir.exists()) {
fileSaveDir.mkdir();
}
for (Part part : request.getParts()) {
String fileName = extractFileName(part);
part.write(savePath + File.separator + fileName);
}
request.setAttribute("message", "Upload has been done successfully!");
getServletContext().getRequestDispatcher("/WEB-INF/jsp/newproduct.jsp").forward(
request, response);
}
/**
* Extracts file name from HTTP header content-disposition
*/
private String extractFileName(Part part) {
String contentDisp = part.getHeader("content-disposition");
String[] items = contentDisp.split(";");
for (String s : items) {
if (s.trim().startsWith("filename")) {
return s.substring(s.indexOf("=") + 2, s.length() - 1);
}
}
return "";
}
}