基本概念

Apache Commons FileUpload?：Apache Commons FileUpload組件提供了一種簡單而靈活的方法，可以將對多部分文件上傳功能的支持添加到Servlet和Web應用程序。?

Maven

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload --> <dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.4</version> </dependency>

源代碼?

package club.zstuca.demo;import java.io.File; import java.io.IOException; import java.util.Iterator; import java.util.List;import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; 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;/*** Servlet implementation class UploadDEMO*/ @WebServlet("/UploadDEMO") public class UploadDEMO extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public UploadDEMO() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubresponse.getWriter().append("Served at: ").append(request.getContextPath());}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");response.setContentType("text/html; charset=UTF-8");boolean bool=ServletFileUpload.isMultipartContent(request);System.out.println(bool);if(bool) {ServletFileUpload upload = new ServletFileUpload(new DiskFileItemFactory());// upload.setFileSizeMax(20);try {List<FileItem> items = upload.parseRequest(request);Iterator<FileItem> it = items.iterator();while(it.hasNext()) {FileItem item = it.next();String name = item.getFieldName();if(item.isFormField()) {if( name.equals("name")){}else if(name.equals("psd")) {}else{}}else {System.out.println(item.getName());String filename = item.getName();String ext = filename.substring(filename.indexOf(".")+1);System.out.println(ext);if(!(ext.equals("png")||ext.equals("gif")||ext.equals("jpg"))){System.out.println("upload file error");return;}String path = request.getSession().getServletContext().getRealPath("upload");File file = new File("C:\\Users\\Lenovo\\Desktop",filename);System.out.println(file.getTotalSpace());item.write(file);}}} catch (Exception e) {// TODO 自動生成的 catch 塊e.printStackTrace();}}System.out.print("OK");} }

教學資源

https://www.bilibili.com/video/av29086718?p=34

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參考文章

暫無

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