更新时间:2022-10-04 20:31:10
下载两样东西
都来自于apache的commons 项目
commons-fileupload-1.3-bin.zip:http://commons.apache.org/proper/commons-fileupload/
上面那个依赖于 commons-io-2.4-bin.zip
commons-io-2.4-bin.zip: http://commons.apache.org/proper/commons-io/
将两个文件解压后 分别找到找到其中lib下的commons-io-2.4.jar 和 commons-fileupload-1.3.jar 放置在 WEB-INF\lib 中
编写上传时候需要的 jsp代码
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fileUpload.jsp 上传文件的首页展示 ================== <%@ 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" >
username:<input type= "text" name= "username" ><br/>
file: <input type= "file" name= "file" ><br/>
file2: <input type= "file" name= "file2" ><br/>
<input type= "submit" value= "submit" ><br/>
</form> </body> </html> |
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UploadServlet.java 用于处理上传过来的文件的servlet =================================== import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
DiskFileItemFactory factory = new DiskFileItemFactory();
String path = req.getRealPath( "/upload" );
factory.setRepository( new File(path));
factory.setSizeThreshold( 1024 * 1024 );
ServletFileUpload upload = new ServletFileUpload(factory);
try {
List<FileItem> list = (List<FileItem>)upload.parseRequest(req); for (FileItem item : list){
String name = item.getFieldName(); if (item.isFormField()){
String value = item.getString(); System.out.println(name+ " = " +value);
req.setAttribute(name, value); } else {
String value = item.getName(); System.out.println(value); int start = value.lastIndexOf( "\\" );
String fileName = value.substring(start+ 1 );
System.out.println(name+ " = " +value);
req.setAttribute(name, fileName); item.write( new File(path, fileName));
} } } catch (Exception ex){
ex.printStackTrace(); } req.getRequestDispatcher( "fileUploadResult.jsp" ).forward(req, resp);
} } |
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fileUploadResult.jsp 上传完后提示 展示的 ================================= <%@ page language= "java" contentType= "text/html; charset=UTF-8"
import = "java.util.*, java.io.*"
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> <%-- <% InputStream is = request.getInputStream(); BufferedReader br = new BufferedReader( new InputStreamReader(is));
String buffer = null ;
while ( null != (buffer=br.readLine())){
out.print(buffer+ "<br>" );
} br.close(); is.close(); %> --%> username: ${requestScope.username }<br /> file: ${requestScope.file }<br /> file: ${requestScope.file2 }<br /> </body> </html> |
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注意:整个程序就这么写好了
需要在 WebContent 下创建一个upload文件夹 进行上传文件的保存
但是如果直接在eclipse jee 当中的tomcat运行的话 保存 到的目录会在别的地址当中 应该是 跟运行环境有关
需要打成war包部署到tomcat当中运行才能正确的上传到 指定的位置