JSP上传文件Servlet（Apache fileUpload）同时text文本 -

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JSP上传文件Servlet（Apache fileUpload）同时text文本

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服务器端代码块
java 文件上传

以Apache组织的commons项目中的FileUpload项目做为jsp的文件上传组件。

在开始之前你要准备以下几个东西:
1. commons-FileUpload 包
下载地址:http://commons.apache.org/fileupload/
2. commons-IO 包
下载地址:http://commons.apache.org/io/
3. Commons-BeanUtils 包
下载地址:http://commons.apache.org/beanutils/

准备工作完成就开始了：

1、新建一个WEB项目upload；

2、把下载好了的jar包复制到项目的WEB-INF/lib目录下；

3、新建或修改JSP文件：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<base href="<%=basePath%>">

		<title>My JSP 'index.jsp' starting page</title>
		<meta http-equiv="pragma" content="no-cache">
		<meta http-equiv="cache-control" content="no-cache">
		<meta http-equiv="expires" content="0">
		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
		<meta http-equiv="description" content="This is my page">
		<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	</head>

	<body>
		This is my upload JSP page.
		<br>
		<form name="upform" action="UploadServlet" method="POST" enctype="multipart/form-data">
			<input type="file" name="file1" id="file1" />
			<br />
			<input type="file" name="file2" if="file2" />
			<br />
			<input type="file" name="file3" id="file3" />
			<br />
			<input type="text" name="text1" id="text1" />
			<br />
			<input type="submit" value="Submit" />
			<input type="reset" />
		</form>
	</body>
</html>

上面有几个要注意的地方：

a、method在这时必须是post的；

b、enctype="multipart/form-data"使表单提交的流而不是表单文本。

4、书写UploadServlet.java

package demo.servlet;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

/**
 * Servlet implementation class for Servlet: UploadServlet
 */
public class UploadServlet extends javax.servlet.http.HttpServlet implements
		javax.servlet.Servlet {
	/** 初始化上传文件的临时存放目录 */
	File tmpDir = null;
	/** 初始化上传文件后的保存目录 */
	File saveDir = null;

	public UploadServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		try {
			// 检查是否是文件上传类型的请求 enctype="multipart/form-data"
			if (ServletFileUpload.isMultipartContent(request)) {
				// 创建一个基于磁盘的文件项目
				DiskFileItemFactory factory = new DiskFileItemFactory();
				factory.setRepository(tmpDir);// 指定上传文件的临时目录
				factory.setSizeThreshold(1024000);// 指定在内存中缓存数据大小,单位为byte
				// 创建一个新的文件上传处理程序
				ServletFileUpload upload = new ServletFileUpload(factory);
				upload.setFileSizeMax(5000000);// 指定单个上传文件的最大尺寸
				upload.setSizeMax(10000000);// 指定一次请求上传多个文件的总尺寸

				// 解析request请求,并执行相应操作
				FileItemIterator fileItems = upload.getItemIterator(request);
				while (fileItems.hasNext()) {
					// 从集合中获得一个文件流
					FileItemStream fileItemStream = fileItems.next();
					
					String name = fileItemStream.getFieldName();// 界面document的name值
				    InputStream stream = fileItemStream.openStream();
					
				    // 过滤掉表单中的非文件域
					if (!fileItemStream.isFormField() && fileItemStream.getName().length() > 0) {
						// 获得上传文件的文件名
						String fileName = fileItemStream.getName();
						// 获得文件输入流
						BufferedInputStream in = new BufferedInputStream(stream);
						// 获得文件输出流
						BufferedOutputStream out = new BufferedOutputStream(
								new FileOutputStream(new File(saveDir
										+ System.getProperty("file.separator")
										+ fileName)));
						// 开始把文件写到指定的上传文件夹
						Streams.copy(in, out, true);
						
						response.getWriter().println("File upload successfully!!!");// 成功,到上传文件夹中看看,上传的东西齐了吗
					} else {
						System.out.println("Form field " + name + " with value "
					            + Streams.asString(stream) + " detected.");
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void init() throws ServletException {
		/*
		 * 对上传文件夹和临时文件夹进行初始化
		 */
		super.init();
		String tmpPath = "d:" + System.getProperty("file.separator") + "tmpdir";
		String savePath = "d:" + System.getProperty("file.separator") + "updir";
		tmpDir = new File(tmpPath);
		saveDir = new File(savePath);
		if (!tmpDir.isDirectory())
			tmpDir.mkdir();
		if (!saveDir.isDirectory())
			saveDir.mkdir();
	}
}

附：还有另外一种不是直接得到数据流的处理方法

				List /* FileItem */ items = upload.parseRequest(request);
				Iterator iter = items.iterator();
				while (iter.hasNext()) {
				    FileItem item = (FileItem) iter.next();
					if (!item.isFormField()) {
						String fieldName = item.getFieldName();
					    String fileName = item.getName();
					    String contentType = item.getContentType();
					    boolean isInMemory = item.isInMemory();
					    long sizeInBytes = item.getSize();
						System.out.println("upload field : fieldName=" + fieldName + " ! fileName=" + fileName
								+" ! contentType=" + contentType + " ! isInMemory=" + isInMemory
								+ " ! sizeInBytes=" + sizeInBytes);
						
						// 获得文件输入流
						BufferedInputStream in = new BufferedInputStream(item.getInputStream());
						// 获得文件输出流
						BufferedOutputStream out = new BufferedOutputStream(
								new FileOutputStream(new File(saveDir
										+ System.getProperty("file.separator")
										+ fileName)));
						// 开始把文件写到指定的上传文件夹
						Streams.copy(in, out, true);
						
						response.getWriter().println("File upload successfully!!!");// 成功,到上传文件夹中看看,上传的东西齐了吗
					} else {
						String name = item.getFieldName();
						String value = item.getString();
						System.out.println("form field : name=" + name + " ! value=" + value);
					}
				}

5、最后配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

	<servlet>
		<servlet-name>UploadServlet</servlet-name>
		<servlet-class>demo.servlet.UploadServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>UploadServlet</servlet-name>
		<url-pattern>/UploadServlet</url-pattern>
	</servlet-mapping>
</web-app>

到次久算写完了，部署启动tomcat，访问http://localhost:8080/upload/

附上工程

参考：

http://commons.apache.org/fileupload/using.html

http://commons.apache.org/fileupload/streaming.html