servlet&jsp上传文件
<servlet>
<servlet-name>UploadServlet</servlet-name>
<servlet-class>com.test.action.UploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UploadServlet</servlet-name>
<url-pattern>/upload</url-pattern>
</servlet-mapping>
<servlet>
package com.test.action;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UploadServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
super.doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
if(req.getContentLength()>297){
InputStream in=req.getInputStream();
File file=new File("c:\\temp","test.txt");
FileOutputStream output=new FileOutputStream(file);
byte[]b=new byte[1024];
int n;
while((n=in.read(b))!=-1){
output.write(b, 0, n);
}
output.close();
in.close();
System.out.println("Upload file is success");
}else{
System.out.println("No file upload");
}
}
}
<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<p>Choose the file for uploading:
<form action="upload" method="post" enctype="multipart/form-data">
<input type="file" name="filename" size="30"/><br>
<input type="submit" name="commit" value="commit"/>
</form>
</body>
</html>
但是在运行的时候报错java.io.FileNotFoundException: c:\temp\test.txt (系统找不到指定的路径。) 经过排查发现是在c盘下 没有建立相应的目录。建立之后能够上传成功。而且因为磁盘保护等原因 只能上传到C盘 不能上传到其他的盘符。
但是上传后自动写入文件的时候 会同时自动写入一些系统信息。
下一步将去掉这些无用的信息、