Java 文件上载在JSP中不起作用
我试图用JSP上传一个文件,但是我发现了一个错误,没有上传任何文件 我用于上传的Servlet代码Java 文件上载在JSP中不起作用,java,jsp,file-upload,Java,Jsp,File Upload,我试图用JSP上传一个文件,但是我发现了一个错误,没有上传任何文件 我用于上传的Servlet代码 import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.nio.file.Files; import java.nio.file.Paths; import java.util.*; import javax.servle
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.*;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
import org.apache.tomcat.util.http.fileupload.FileItem;
import org.apache.tomcat.util.http.fileupload.FileUploadException;
import org.apache.tomcat.util.http.fileupload.RequestContext;
import org.apache.tomcat.util.http.fileupload.disk.DiskFileItemFactory;
import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;
import org.apache.tomcat.util.http.fileupload.servlet.ServletRequestContext;
/**
*
* @author Hemal
*/
@MultipartConfig
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String DATA_DIRECTORY = "data";
private static final int MAX_MEMORY_SIZE = 1024 * 1024 * 2;
private static final int MAX_REQUEST_SIZE = 1024 * 1024;
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
File file;
int maxFileSize = 5000 * 1024;
int maxMemSize = 5000 * 1024;
ServletContext context = request.getServletContext();
String filePath = context.getInitParameter("file-upload");
PrintWriter out=response.getWriter();
// Verify the content type
String contentType = request.getContentType();
if ((contentType.contains("multipart/form-data"))) {
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Location to save data that is larger than maxMemSize.
factory.setRepository(new File("data"));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax(maxFileSize);
try {
// Parse the request to get file items.
List fileItems = upload.parseRequest(request);//ERROR ON THIS LINE
// Process the uploaded file items
Iterator i = fileItems.iterator();
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
if (!fi.isFormField()) {
// Get the uploaded file parameters
String fieldName = fi.getFieldName();
String fileName = fi.getName();
boolean isInMemory = fi.isInMemory();
long sizeInBytes = fi.getSize();
// Write the file
if (fileName.lastIndexOf("\\") >= 0) {
file = new File(filePath
+ fileName.substring(fileName.lastIndexOf("\\")));
} else {
file = new File(filePath
+ fileName.substring(fileName.lastIndexOf("\\") + 1));
}
fi.write(file);
out.println("Uploaded Filename: " + filePath
+ fileName + "<br>");
}
}
} catch (Exception ex) {
System.out.println(ex);
}
}
}
}
是
HttpServletRequest无法转换为RequestContext
我尝试了许多选择,但没有成功
谢谢
编辑
jsp中带有文件上载的其他链接只显示部分代码,而没有将实际文件保存到用户定义的目录中。我想有一个代码保存一个文件也到一个目录。所以我认为这不是一个重复的问题。你可以用这个:
InputStream content = uploadedFile.getInputStream();
byte[] fileArray = new byte[chooseTheSize]; //Here you must use a size big enough.
content.read(fileArray);
//fileArray是您的文件 您必须显示错误消息。可能重复的或@Elvermg我已经显示了有问题的错误消息本身。@Taha,您提供的链接,我已经尝试并访问了它,但它没有显示如何保存上载的文件。您能显示整个堆栈跟踪吗?
InputStream content = uploadedFile.getInputStream();
byte[] fileArray = new byte[chooseTheSize]; //Here you must use a size big enough.
content.read(fileArray);