How to copy local file to network file and upload using Java?

package dragon; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; /** * 本地文件复制: * 将文件从一个地方复制到另一个地方。 * * @author Alfred * */ public class FileCopy { public FileCopy() {} public void fileCopy(String target, String output) throws IOException { File targetFile = new File(target); File outputPath = new File(output); this.init(targetFile, outputPath); /**注意这里使用了 try with resource 语句，所以不需要显示的关闭流了。 * 而且，再关闭流操作中，会自动调用 flush 方法，如果不放心， * 可以在每个write 方法后面，强制刷新一下。 * */ try ( BufferedInputStream bis = new BufferedInputStream(new FileInputStream(targetFile)); //创建输出文件 BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(outputPath, "copy"+targetFile.getName())))){ int hasRead = 0; byte[] b = new byte[1024]; while ((hasRead = bis.read(b)) != -1) { bos.write(b, 0, hasRead); } } System.out.println("文件复制成功"); } //数据校验及初始化工作 private void init(File targetFile, File outputPath) throws FileNotFoundException { if (!targetFile.exists()) { throw new FileNotFoundException("目标文件不存在："+targetFile.getAbsolutePath()); } else { if (!targetFile.isFile()) { throw new FileNotFoundException("目标文件是一个目录："+targetFile.getAbsolutePath()); } } if (!outputPath.exists()) { if (!outputPath.mkdirs()) { throw new FileNotFoundException("无法创建输出路径："+outputPath.getAbsolutePath()); } } else { if (!outputPath.isDirectory()) { throw new FileNotFoundException("输出路径不是一个目录："+outputPath.getAbsolutePath()); } } } }

package dragon; import java.io.IOException; public class FileCopyTest { public static void main(String[] args) throws IOException { String target = "D:/DB/BuilderPattern.png"; String output = "D:/DBC/dragon/"; FileCopy copy = new FileCopy(); copy.fileCopy(target, output); } }

import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.net.ServerSocket; import java.net.Socket; public class Server { public static void main(String[] args) throws IOException { try ( ServerSocket server = new ServerSocket(8080)){ Socket client = server.accept(); //开始读取文件 try ( BufferedInputStream bis = new BufferedInputStream(client.getInputStream()); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("D:/DBC/dragon", System.currentTimeMillis()+".jpg")))){ int hasRead = 0; byte[] b = new byte[1024]; while ((hasRead = bis.read(b)) != -1) { bos.write(b, 0, hasRead); } } System.out.println("文件上传成功。"); } } }

import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.net.Socket; import java.net.UnknownHostException; public class Client { public static void main(String[] args) throws UnknownHostException, IOException { try (Socket client = new Socket("127.0.0.1", 8080)){ File file = new File("D:/DB/netFile/001.jpg"); //开始写入文件 try ( BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file)); BufferedOutputStream bos = new BufferedOutputStream(client.getOutputStream())){ int hasRead = 0; byte[] b = new byte[1024]; while ((hasRead = bis.read(b)) != -1) { bos.write(b, 0, hasRead); } } } } }

package com.study; 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.FileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * Servlet implementation class UploadServlet */ @WebServlet("/UploadServlet") public class UploadServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //如果不是文件上传的话，直接不处理，这样比较省事 if (ServletFileUpload.isMultipartContent(request)) { //获取（或者创建）上传文件的路径 String path = request.getServletContext().getRealPath("/image"); File uploadPath = new File(path); if (!uploadPath.exists()) { uploadPath.mkdir(); } FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List items; try { items = upload.parseRequest(request); Iterator it = items.iterator(); while (it.hasNext()) { FileItem item = it.next(); //处理上传文件 if (!item.isFormField()) { String filename = new File(item.getName()).getName(); System.out.println(filename); File file = new File(uploadPath, filename); item.write(file); response.sendRedirect("success.jsp"); } } } catch (Exception e) { e.printStackTrace(); } } } }

文件上传
 
   

try ( BufferedInputStream bis = new BufferedInputStream(part.getInputStream()); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(path, filename)))){ int hasRead = 0; byte[] b = new byte[1024]; while ((hasRead = bis.read(b)) != -1) { bos.write(b, 0, hasRead); } }

part.write(filename);