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

zhouying23 · 发表于 2017-1-10 07:18:59

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">

</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

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