在使用servlet完成图片的上传时发现系统找不到指定的路径没代码如下
package servlet;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.IOUtils;
import pojo.User;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.List;
import java.util.UUID;
public class FileUpload extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
User user = new User();
List<FileItem> fileItems =null;
try {
fileItems = servletFileUpload.parseRequest(req);
} catch (FileUploadException e) {
e.printStackTrace();
}
for(FileItem fileItem :fileItems){
if(fileItem.isFormField()){
if("username".equals(fileItem.getFieldName())){
final String string = fileItem.getString("utf-8");
user.setId(Integer.parseInt(string));
}
}else {
InputStream inputStream = fileItem.getInputStream();
String name = fileItem.getName();
System.out.println(name);
final String realPath = req.getServletContext().getRealPath("/img/");
name = UUID.randomUUID().toString().replaceAll("-","")+"_"+name;
user.setImg(req.getContextPath()+"/img/"+name);
System.out.println(user.getImg());
System.out.println(realPath+name);
FileOutputStream fileOutputStream = new FileOutputStream(realPath+name);
IOUtils.copy(inputStream,fileOutputStream);
inputStream.close();
fileOutputStream.close();
req.setAttribute("user",user);
req.getRequestDispatcher("/pages/img.jsp").forward(req,resp);
}
}
}
}
由于路径都是通过方法获取到的，所以研究了很久之后终于被我发现了一个问题，在项目部署运行时生成的out文件中，空文件不会被创建文件夹！
解决办法，在文件夹里随便放点东西，让人家生成一下文件夹，当然手动创建也可以。
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