这是eclipse显示的错误 ！[这个eclipse文件夹结构] [1]
Nov 13, 2013 6:46:38 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Image] in context with path [/uploadimg] threw exception
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(Unknown Source)
at com.vaibhav.upload.doPost(upload.java:72)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
............................................... ...........................................
UPLOAD.java（servlet代码）
package com.vaibhav;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import javax.imageio.ImageIO;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.imgscalr.Scalr;
public class upload extends HttpServlet {
private boolean isMultipart;
String ofileName;
String fieldName;
String contentType;
File usersDir = null;
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
isMultipart = ServletFileUpload.isMultipartContent(request);
System.out.println("hhhhhhhhhhhhhhhhhhhhhhhh");
if (!isMultipart) {
} else {
File fobj = new File(getServletContext().getRealPath("\\"));
FileItemFactory factory = new DiskFileItemFactory(1024 * 5, fobj);
ServletFileUpload upload = new ServletFileUpload(factory);
List items = null;
System.out.println("hiiiiiiiiiiiiiiiiiiiiiiiii");
try {
items = upload.parseRequest(request);
} catch (FileUploadException e) {
e.printStackTrace();
}
System.out.println(items);
Iterator itr1 = items.iterator();
FileItem fileItem = null;
while (itr1.hasNext()) {
FileItem item = (FileItem) itr1.next();
if (item.isFormField()) {
item.getFieldName();
item.getString();
} else {
fileItem = item;
String finalName;
fieldName = item.getFieldName();
ofileName = item.getName();
contentType = fileItem.getContentType();
finalName = ofileName
.substring(ofileName.lastIndexOf("\\"));
finalName = ofileName;
usersDir = new File(getServletContext().getRealPath("\\")
+ "\\users\\" + "\\images\\" + finalName);
try {
fileItem.write(usersDir);
} catch (Exception e) {
e.printStackTrace();
}
String imgExt = usersDir.getAbsolutePath().substring(
usersDir.getAbsolutePath().lastIndexOf(".") + 1);
BufferedImage bimg = new BufferedImage(100, 100,
BufferedImage.TYPE_INT_RGB);
bimg.createGraphics().drawImage(
ImageIO.read(usersDir).getScaledInstance(170, 150,
java.awt.Image.SCALE_SMOOTH), 0, 0, null);
BufferedImage bimg2 = Scalr.resize(bimg, 150);
ImageIO.write(bimg2, imgExt, new File(getServletContext()
.getRealPath("\\")
+ "\\users\\"
+ "\\images\\thumb_" + finalName));
}
RequestDispatcher dispatcher = getServletContext()
.getRequestDispatcher("/WEB-INF/webpages/home.jsp");
dispatcher.forward(request, response);
}
}
}
}
............................................... ............................................ index.jsp的
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>file upload</title>
</head>
<body>
<form action="upload" method="post" enctype="multipart/form-data">
<input type="file" name="file" size="50"><br/> <input
type="submit" value="uploadfile">
</form>
</body>
</html>
！[控制台上显示的错误] [10]
我希望它会为每个用户创建运行时文件夹和子文件夹.....
答案 0 :(得分：2)
你的问题就在这一行：
finalName = ofileName.substring(ofileName.lastIndexOf("\\"));
这是在Upload.java的源文件的第72行，您可以从堆栈跟踪中轻松获取。
ofileName不包含任何\个字符，因此lastIndexOf返回-1 substring，int nameStart = ofileName.lastIndexOf("\\");
if (nameStart > -1) {
finalName = ofileName.substring(nameStart);
} else {
finalName = ofileName; // there's nothing to substring
}
不能用作开始索引。试图这样做会给你一个正常的例外。
相反，这样做。
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