JAVA文件上传(1)

JAVA文件上传(1)

1.上传文件的方法.(客户端)

package com.test;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.ProtocolException;import java.net.URL;import java.util.UUID;public class Shangchuan {public void upload(String path, File file,String key) {// 边界标识 随机生成,生成类似于这样的内容:07d11368-0c72-45ac-a67a-c243a085c604String BOUNDARY = UUID.randomUUID().toString();String PREFIX = "--";String LINE_END = "\r\n";String result = null;try {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setDoInput(true);conn.setDoOutput(true);conn.setUseCaches(false);conn.setRequestMethod("POST");conn.setRequestProperty("Connection", "Keep-Alive");conn.setRequestProperty("Charset", "utf-8");// 必须设定的内容conn.setRequestProperty("Content-Type","multipart/form-data;;boundary=" + BOUNDARY);if (file != null) {DataOutputStream dos = new DataOutputStream(conn.getOutputStream());StringBuffer sb = new StringBuffer();sb.append(PREFIX);sb.append(BOUNDARY);sb.append(LINE_END);/** * 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件. * 这里服务端是用的servlet * ,key的值就是对应servlet的映射路径。就是这里path(URL)的最后一部分:filee. * filename是文件的名字，包含后缀名的 比如:abc.png */sb.append("Content-Disposition: form-data; name=\""+key+"\"; filename=\""+ file.getName() + "\"" + LINE_END);sb.append("Content-Type: application/octet-stream; charset="+ "utf-8" + LINE_END);sb.append(LINE_END);dos.write(sb.toString().getBytes());InputStream is = new FileInputStream(file);byte[] bytes = new byte[1024];int len = 0;while ((len = is.read(bytes)) != -1) {dos.write(bytes, 0, len);}is.close();dos.write(LINE_END.getBytes());byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes();dos.write(end_data);dos.flush();/** * 获取响应码 200=成功 当响应成功，获取响应的流 */int res = conn.getResponseCode();if (res == 200) {InputStream input = conn.getInputStream();StringBuffer sb1 = new StringBuffer();int ss;while ((ss = input.read()) != -1) {sb1.append((char) ss);}result = sb1.toString();System.out.println("来自服务器的信息:" + result);} else {System.out.println("连接失败!");}}} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

2.调用上传的方法.(客户端)

package com.test;import java.io.File;public class Sc {public static void main(String[] args) {Shangchuan shangchuan=new Shangchuan();String pathname="E:\\FeiQ.exe";File file=new File(pathname);String path="http://localhost:8080/prjWebTest/filee";/*服务端使用的servlet,filee对应服务端的一个servlet类的映射路径*/String key="filee";shangchuan.upload(path, file,key);}}

3.服务端.

负责上传文件的Servlet的代码，需要使用两个jar文件，commons-fileupload-1.2.1.jar和

commons-io-1.3.2.jar。

package com.upload;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;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.FileUploadException;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;@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stub// 1、创建文件上传工厂DiskFileItemFactory diskfactory = new DiskFileItemFactory();// 2、创建上传对象ServletFileUpload upload = new ServletFileUpload(diskfactory);try {// 3、开始处理上传的请求@SuppressWarnings("unchecked")List<FileItem> lsitem = upload.parseRequest(req);// 4、获取上传的数据包括表单数据和文件数据for (FileItem fileItem : lsitem) {  // 判断是表单元素，如果是表单元素，获取表单元素的值if (fileItem.isFormField()) {System.out.println("====================================");} else {byte[] b = fileItem.get();String fname = fileItem.getName();fname = fname.substring(fname.lastIndexOf("\\") + 1);System.out.println("文件名字:" + fname);String path = this.getServletContext().getRealPath("/")+ "/upload/";// +fname;System.out.println("上传文件的路径:" + path);File dir = new File(path);if (!dir.exists()) {dir.mkdir();}String filepath = path + fname;System.out.println("文件的路径:" + filepath);File file = new File(filepath);FileOutputStream fout = new FileOutputStream(file);fout.write(b);fout.flush();fout.close();}}OutputStream out=resp.getOutputStream();String str="this message  to client";byte[]bb=str.getBytes();out.write(bb);out.flush();out.close();} catch (FileUploadException e) {// TODO Auto-generated catch blocke.printStackTrace();}}@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stubdoPost(req, resp);}}

配置文件:

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <display-name></display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>  <servlet>        <servlet-name>UploadServlet</servlet-name>        <servlet-class>com.upload.UploadServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>UploadServlet</servlet-name>        <url-pattern>/filee</url-pattern>    </servlet-mapping></web-app>

说明:这是java文件上传的一个例子(因为我主要想在Android上应用,所以在服务端没有界面文件),这里的服务端和客户端是在两个单独的java工程里面的，所以可以很方便的将这里的java客户端的代码移植到Android上面。