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JSP Servlet学习笔记——使用fileupload上传文件

2015-09-21 13:46 851 查看

关键代码如下：

index.jsp

[html] view plain copy print ?

<body>

<center>

<h3>文件上传</h3>

<font color="red"><%=request.getAttribute("msg")==null?"":request.getAttribute("msg") %> </font>

<form enctype="multipart/form-data" method="post" action="servlet/FileUploadServlet">

文件描述：<input type="text" name="text" /><br/>

选择文件：<input type="file" name="file1" /><br/>

选择文件：<input type="file" name="file2" /><br/>

选择文件：<input type="file" name="file3" /><br/>

选择文件：<input type="file" name="file4" /><br/>

选择文件：<input type="file" name="file5" /><br/>

<input type="submit" value="上传" />

</form>

</center>

</body>

FileUploadServlet.jsp

[java] view plain copy print ?

package com.accp.fileupload.servlet;

import java.io.File;

import java.io.IOException;

import java.util.List;

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.FileUploadException;

import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUploadServlet extends HttpServlet {

private static final long serialVersionUID = 2827297299439162553L;

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//使用同一种处理方法

doPost(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

response.setContentType("text/html; charset=UTF-8");

//保存路径

String savePath = getServletContext().getRealPath("/upload");

File saveDir = new File(savePath);

// 如果目录不存在，就创建目录

if(!saveDir.exists()){

saveDir.mkdir();

}

// 创建文件上传核心类

DiskFileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload sfu = new ServletFileUpload(factory);

//设置编码

sfu.setHeaderEncoding("UTF-8");

// 设置上传的单个文件的最大字节数为2M

sfu.setFileSizeMax(1024*1024*2);

//设置整个表单的最大字节数为10M

sfu.setSizeMax(1024*1024*10);

try{

// 处理表单请求

List<FileItem> itemList = sfu.parseRequest(request);

for (FileItem fileItem : itemList) {

// 对应表单中的控件的name

String fieldName = fileItem.getFieldName();

System.out.println("控件名称：" + fieldName);

// 如果是普通表单控件

if(fileItem.isFormField()){

String value = fileItem.getString();

//重新编码,解决乱码

value = new String(value.getBytes("ISO-8859-1"),"UTF-8");

System.out.println("普通内容：" + fieldName + "=" + value);

// 上传文件

}else{

// 获得文件大小

Long size = fileItem.getSize();

// 获得文件名

String fileName = fileItem.getName();

System.out.println("文件名："+fileName+"\t大小：" + size + "byte");

//设置不允许上传的文件格式

if(fileName.endsWith(".exe")){

request.setAttribute("msg", "不允许上传的类型！");

}else{

//将文件保存到指定的路径

File file = new File(savePath,fileName);

fileItem.write(file);

request.setAttribute("msg", "上传成功！");

}

}

}

}catch(FileSizeLimitExceededException e){

request.setAttribute("msg", "文件太大");

}catch(FileUploadException e){

e.printStackTrace();

}catch(Exception e){

e.printStackTrace();

}

//上传完毕后转发到首页

request.getRequestDispatcher("/index.jsp").forward(request, response);

}

}

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