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<span style="font-family: Arial, Helvetica, sans-serif; "><span style="color:#ff0000;">一 环境的搭建：</span></span>
eclipase + javaEE + commons-fileupload-1.2.1.jar + commons-io-2.0.jar + tomcat 7.0.68
二 文件上传的servlet 代码实现！
package com.baidu.fileupload.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;@WebServlet("/uploadServlet")public class UploadServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {DiskFileItemFactory factory = new DiskFileItemFactory();factory.setSizeThreshold(1024*500);File tempDirectory = new File("d:\\tempDirectory");factory.setRepository(tempDirectory);ServletFileUpload upload = new ServletFileUpload(factory);try {List<FileItem> items = upload.parseRequest(request);for(FileItem item:items){if(item.isFormField()){String name = item.getFieldName();String value = item.getString();System.out.println( name + " : " + value);}else{String fieldName = item.getFieldName();String fileName = item.getName();String contentType = item.getContentType();long sizeInBytes = item.getSize();System.out.println(fieldName);System.out.println(fileName);System.out.println(contentType);System.out.println(sizeInBytes);InputStream in = item.getInputStream();byte[] buffer = new byte[1024];int len = 0;fileName = "d:\\files\\" + fileName;System.out.println(fileName);OutputStream out = new FileOutputStream(fileName);while((len = in.read(buffer)) != -1){out.write(buffer, 0, len);}out.close();in.close();}}} catch (FileUploadException e) {e.printStackTrace();}}}
三 JSP 编写
update.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!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=UTF-8"><title>Insert title here</title></head><body><form action="uploadServlet" method="post" enctype="multipart/form-data">File: <input type="file" name="file" /><br><br><br><br>DESC: <input type="text" name="desc" /><br><br><br><br><input type="submit" value="Submit" /></form></body></html>
四， 运行过程中出现的问题
五， 解决的办法：
进过一番百度， 无意中看到一位朋友提到，不同的浏览器对上传的文件名的处理方式不太一样 ，进过一番实验，搞定，且增加了一行代码！
package com.baidu.fileupload.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;@WebServlet("/uploadServlet")public class UploadServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {DiskFileItemFactory factory = new DiskFileItemFactory();factory.setSizeThreshold(1024*500);File tempDirectory = new File("d:\\tempDirectory");factory.setRepository(tempDirectory);ServletFileUpload upload = new ServletFileUpload(factory);upload.setSizeMax(1024 * 1024 * 5);try {List<FileItem> items = upload.parseRequest(request);for(FileItem item:items){if(item.isFormField()){String name = item.getFieldName();String value = item.getString();System.out.println( name + " : " + value);}else{String fieldName = item.getFieldName();String fileName = item.getName();String contentType = item.getContentType();long sizeInBytes = item.getSize();System.out.println(fieldName);System.out.println(fileName);System.out.println(contentType);System.out.println(sizeInBytes);//不同的浏览器提交的文件名是不一样的，有些浏览器提交的文件名是带有路径的，如：c:\nihao\a.txt，而有些只是单纯的文件名，如：a.txt//处理获取到的上传文件的文件名的路径部分，只保留文件名部分fileName = fileName.substring(fileName.lastIndexOf("\\")+1);InputStream in = item.getInputStream();byte[] buffer = new byte[1024];int len = 0;fileName = "d:\\files\\" + fileName;System.out.println(fileName);OutputStream out = new FileOutputStream(fileName);while((len = in.read(buffer)) != -1){out.write(buffer, 0, len);}out.close();in.close();}}} catch (FileUploadException e) {e.printStackTrace();}}}
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