JAVA SERVLET上传文件的样码
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
/**
* Servlet implementation class FileUploadServlet
*/
@WebServlet(name = "FileUploadServlet", urlPatterns = {"/upload"})
@MultipartConfig
public class FileUploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
ServletContext servletContext = this.getServletContext();
String realPath = servletContext.getRealPath("/upload");
final Part filePart = request.getPart("file");
final String fileName = getFileName(filePart);
OutputStream out = null;
InputStream filecontent = null;
final PrintWriter writer = response.getWriter();
try {
System.out.println(realPath + "@@@@@@@@@@@@@@@@@@@@@@@@@");
System.out.println( File.separator + "@@@@@@@@@@@@@@@@@@@@@@@@@");
System.out.println( fileName + "@@@@@@@@@@@@@@@@@@@@@@@@@");
out = new FileOutputStream(
new File(realPath + File.separator + fileName));
filecontent = filePart.getInputStream();
int read;
final byte[] bytes = new byte[1024];
while ((read=filecontent.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
writer.println("upload file " + fileName + " to path " + realPath);
} catch (FileNotFoundException fne) {
writer.println("no upload path or upload path is wrong.");
writer.println("<br/> error: " + fne.getMessage());
} finally {
if (out !=null) {
out.close();
}
if (filecontent != null){
filecontent.close();
}
if (writer != null) {
writer.close();
}
}
}
private String getFileName(final Part part) {
// TODO Auto-generated method stub
for (String content: part.getHeader("content-disposition").split(";")) {
System.out.println(content + "####################");
if (content.trim().startsWith("filename")) {
String filename = content.substring(
content.lastIndexOf("\\") + 1).trim().replace("\"", "");
System.out.println(filename + "####################");
return "2.zip";
}
}
return null;
}
/**
* @see HttpServlet#HttpServlet()
*/
public FileUploadServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
processRequest(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
processRequest(request, response);
}
}
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Login</title> </head> <body> <form method="POST" action="upload" enctype="multipart/form-data"> choose a file: <input type="file" name=file id="file" /><br/><br/> <input type="submit" value="upload" name="upload" id="upload" /> </form> </body> </html>
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