使用FileUpload接收上传内容

来源：互联网发布：隔墙听淘宝编辑：程序博客网时间：2024/06/01 10:05

上传表单：fileupload.html

<html> <head>  <title>fileupload Test</title> </head> <body><form action="fileupload.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>

FileUpload的具体上传操作与SmartUpload相比有着很高的复杂度。

FileUpload上传的基本操作步骤：

①创建磁盘工厂：DiskFileItemFactory factory = new DiskFileItemFactory();

②创建处理的工具：ServletFileUpload upload = new ServletFileUpload(factory);

③设置上传文件大小：upload.setFileSizeMax(3145728);

④接收全部内容：List<FileItem> items = upload.parseRequest(request);

接收上传文件：fileupload.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>fileupload Test</title></head><body><%DiskFileItemFactory factory = new DiskFileItemFactory() ;ServletFileUpload upload = new ServletFileUpload(factory) ;upload.setFileSizeMax(3 * 1024 * 1024) ;// 只能上传3MList<FileItem> items = upload.parseRequest(request) ; // 接收全部内容Iterator<FileItem> iter = items.iterator() ;while(iter.hasNext()){FileItem item = iter.next() ;String fieldName = item.getFieldName() ;// 取得表单控件的名称%><ul><h4><%=fieldName%> --> <%=item.isFormField()%></h4><%if(!item.isFormField()){// 不是普通文本String fileName = item.getName() ;// 取得文件的名称String contentType = item.getContentType() ;// 文件类型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>

保存上传内容
定义上传表单：fileupload2.jsp

<html><head><title>fileupload Test</title></head><body><form action="fileupload2.jsp" method="post" enctype="multipart/form-data"> 姓名：<input type="text" name="uname"><br>照片：<input type="file" name="pic1"><br>照片：<input type="file" name="pic2"><br>照片：<input type="file" name="pic3"><br><input type="submit" value="上传"><input type="reset" value="重置"></form></body></html>

保存上传内容：fileupload2.jsp

<%@ page contentType="text/html" pageEncoding="GBK"%><%@ page import="java.util.*,java.io.*"%><%@ page import="org.apache.commons.fileupload.*"%><%@ page import="org.apache.commons.fileupload.disk.*"%><%@ page import="org.apache.commons.fileupload.servlet.*"%><%@ page import="cn.mldn.lxh.util.*"%><html><head><title>fileupload Test</title></head><body><%DiskFileItemFactory factory = new DiskFileItemFactory() ;factory.setRepository(new File(this.getServletContext().getRealPath("/") + "uploadtemp")) ;// 更准确的说是一个临时文件ServletFileUpload upload = new ServletFileUpload(factory) ;upload.setFileSizeMax(3 * 1024 * 1024) ;// 只能上传3MList<FileItem> items = upload.parseRequest(request) ; // 接收全部内容Iterator<FileItem> iter = items.iterator() ;//将全部的内容变为Iterator实例IPTimeStamp its = new IPTimeStamp(request.getRemoteAddr()) ;while(iter.hasNext()){FileItem item = iter.next() ;String fieldName = item.getFieldName() ;// 取得表单控件的名称%><ul><h4><%=fieldName%> --> <%=item.isFormField()%></h4><%if(!item.isFormField()){// 不是普通文本File saveFile = null ;//定义保存文件InputStream input = null ;//定义文件的输入流，用于读取源文件OutputStream output = null ;//定义文件的输出流，用于保存文件input = item.getInputStream() ;//取得上传文件的输入流output = new FileOutputStream(new File(this.getServletContext().getRealPath("/")+"upload"+File.separator+its.getIPTimeRand()+"."+item.getName().split("\\.")[1])) ;//定义输出文件的路径int temp = 0 ;byte data[] = new byte[512] ;//分块保存while((temp=input.read(data,0,512))!=-1){//依次读取内容output.write(data) ;// 分块保存}input.close() ;output.close() ;} else {String value = item.getString() ;//取得表单的内容%><li>普通参数：<%=value%><%}%></ul><%}%></body></html>

开发FileUpload组件的专属操作类

方法：

NO.方法类型描述1public FileUploadTools(HttpServletRequest request,int maxSize,String tempDir) throws Exception构造实例化FileUploadTools类，并接收request对象、最大上传文件限制、上传临时保存目录路径2public String getParameter(String name)普通根据参数名称取得参数内容3public String [] getParameterValues(String name)普通根据参数名称取得一组参数内容4public Map<String ,FileItem> getUploadFiles()普通取得全部上传的文件5public List<String> saveAll(String saveDir) throws IOException普通自动保存全部的上传文件，并将已上传文件的名称返回给调用处
fileupload_demo03.htm

<html><head><title>fileupload Test</title></head><body><form action="fileupload_demo03.jsp" method="post" enctype="multipart/form-data"> 姓名：<input type="text" name="uname"><br>兴趣：<input type="checkbox" name="inst" value="Swing">游泳<input type="checkbox" name="inst" value="Song">唱歌<input type="checkbox" name="inst" value="Run">跑步<br>照片：<input type="file" name="pic1"><br>照片：<input type="file" name="pic2"><br>照片：<input type="file" name="pic3"><br><input type="submit" value="上传"><input type="reset" value="重置"></form></body></html>

fileupload_demo03.jsp

<%@ page contentType="text/html" pageEncoding="GBK"%><%@ page import="java.util.*,java.io.*"%><%@ page import="org.apache.commons.fileupload.*"%><%@ page import="org.apache.commons.fileupload.disk.*"%><%@ page import="org.apache.commons.fileupload.servlet.*"%><%@ page import="cn.mldn.lxh.util.*"%><html><head><title>fileupload Test</title></head><body><%FileUploadTools fut = new FileUploadTools(request,3*1024*1024,this.getServletContext().getRealPath(".")+"uploadtemp") ;String name = fut.getParameter("uname") ;String inst[] = fut.getParameterValues("inst") ;List<String> all = fut.saveAll(this.getServletContext().getRealPath("/")+"upload"+java.io.File.separator) ;%><h3>姓名：<%=name%><h3><h3>兴趣：<%for(int x=0;x<inst.length;x++){%><%=inst[x]%>、<%}%></h3><%Iterator<String> iter = all.iterator() ;while(iter.hasNext()){%><img src="../upload/<%=iter.next()%>"><%}%></body></html>

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