ch8.文件上传

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smartupload是一个系统提供的jar包，在非框架开发中非常好用

上传文件时表单必须封装。

封装形式；<form action = "xxx.jsp", method = "post" enctype = "multipart/form-data">按照二进制形式进行提交

要上传文件，必须先建立一个upload的文件夹，这个文件夹保存在WEB根目录下。

代码步骤：

实例化SmartUpload对象
初始化上传的操作
准备文件
保存文件

上传文件：

smart_demo1.html

<html><head><title>www.thystar.com</title></head><body><form action = "smart_demo1.jsp", method = "post" enctype = "multipart/form-data">选择上传文件:<input type="file" name = "pic"><input type="submit" value="上传"></form></body></html>

smart_demo1.jsp

<%@ page contentType="text/html" pageEncoding = "GBK"%><%@ page import = "org.lxh.smart.*"%> //将jar包解压放到WEB-INF的classes文件夹下<html><head><title>www.thystar.com</title></head><body><%SmartUpload smart = new SmartUpload();   //实例化SmartUpload对象smart.initialize(pageContext);      //初始化上传操作smart.upload();   //上传准备smart.save("upload");//上传准备%></body></html>

但是，表单一旦上传，就无法使用request.getParameter()接受参数，所以使用String str = smart.getRequest().getParameter("xxx")接收,这段代码在samrt.upload()后。

FileUpload 使用

FileUpload 主要用于框架开发

FileUpload上传的步骤

创建磁盘工厂：DistFileItemFactory fac = new DistFileItemFactory()
创建处理工具：ServletFileUpload upload = new ServletFileUpload(fac)
设置上传文件大小：upload.setFileSizeMax(xxxxxxxxx);
接收全部内容： List<FileItem>items = upload.parseRequst(request);

demo.html

<html><head><title>www.thystar.com</title></head><body><form action = "demo1.jsp", method = "post" enctype = "multipart/form-data">姓名：<input type="text", name = "uname"><br>照片:<input type="file" name = "pic"><br><input type="submit" value="上传"><input type="reset" value="重置"></form></body></html>

demo.jsp

<%@ page contentType="text/html" pageEncoding = "GBK"%><%@ page import = "java.util.*"%><%@ page import = "org.apache.commons.fileupload.*"%><%@ page import = "org.apache.commons.fileupload.disk.*"%><%@ page import = "org.apache.commons.fileupload.servlet.*"%><html><head><title>www.thystar.com</title></head><% request.setCharacterEncoding("GBK");%><body><%DiskFileItemFactory factory = new DiskFileItemFactory() ;ServletFileUpload upload = new ServletFileUpload(factory) ;upload.setFileSizeMax(3 * 1024 * 1024);List<FileItem> items = upload.parseRequest(request);Iterator<FileItem> iter = items.iterator();while(iter.hasNext()){FileItem item = iter.next();String filedName = item.getFieldName();%><ul><h4>表单控件名称：<%=filedName%>---> <%=item.isFormField()%></h4><%if(!item.isFormField()){String fileName = item.getName();String contentType = item.getContentType();long sizeInBytes = item.getSize();%><li>上传文件名称：<%=fileName%><li>上传文件类型：<%=contentType%><li>上传文件大小：<%=sizeInBytes%><%}else{String value = item.getString();%><li>普通参数：<%=value%><%}%></ul><%}%></body></html>

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