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ren2881971
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servlet&jsp上传文件

    博客分类：
  • j2ee
 
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 <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、
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| 开始完整的学习Servlet&Jsp
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