• android批量文件上传(android批量图片上传)


    项目中多处用到文件批量上传功能,今天正好攻克了此问题。在此写出来,以便日后借鉴。
    首先,以下架构下的批量文件上传可能会失败或者不会成功:
                1.androidclient+springMVC服务端:服务端採用org.springframework.web.multipart.MultipartHttpServletRequest作为批量上传接收类。这种搭配下的批量文件上传会失败。终于服务端仅仅会接受到一个文件。即仅仅会接受到第一个文件。可能由于MultipartHttpServletRequest对servlet原本的HttpServletRequest类进行封装,导致批量上传有问题。
                 2.androidclient+strutsMVC服务端:这种搭配下的多文件上传。本人没有亲自尝试,不做评论。

    假设有网友採用此种方式上传失败的。原因可能同1。


    接下来说明上传成功的方案:
              採用androidclient+Servlet(HttpServletRequest)进行文件上传。
              Servlet端代码例如以下:

          

    DiskFileItemFactory factory = new DiskFileItemFactory();
    		ServletFileUpload upload = new ServletFileUpload(factory);
    		try
    		{
    			List items = upload.parseRequest(request);
    			Iterator itr = items.iterator();
    			while (itr.hasNext())
    			{
    				FileItem item = (FileItem) itr.next();
    				if (item.isFormField())
    				{
    					System.out.println("表单參数名:" + item.getFieldName() + ",表单參数值:" + item.getString("UTF-8"));
    				} 
    				else
    				{
    					if (item.getName() != null && !item.getName().equals(""))
    					{
    						System.out.println("上传文件的大小:" + item.getSize());
    						System.out.println("上传文件的类型:" + item.getContentType());
    						// item.getName()返回上传文件在client的完整路径名称
    						System.out.println("上传文件的名称:" + item.getName());
    
    						File tempFile = new File(item.getName());
    						// 上传文件的保存路径
    						File file = new File(sc.getRealPath("/") + savePath, tempFile.getName());
    						item.write(file);
    						request.setAttribute("upload.message", "上传文件成功!");
    					} else
    					{
    						request.setAttribute("upload.message", "没有选择上传文件!

    "); } } } } catch (FileUploadException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); request.setAttribute("upload.message", "上传文件失败!

    "); } request.getRequestDispatcher("/uploadResult.jsp").forward(request, response);


    android端代码例如以下:

    public class SocketHttpRequester {
        /**
         *多文件上传
         * 直接通过HTTP协议提交数据到server,实现如以下表单提交功能:
         *   <FORM METHOD=POST ACTION="http://192.168.1.101:8083/upload/servlet/UploadServlet" enctype="multipart/form-data">
                <INPUT TYPE="text" NAME="name">
                <INPUT TYPE="text" NAME="id">
                <input type="file" name="imagefile"/>
                <input type="file" name="zip"/>
             </FORM>
         * @param path 上传路径(注:避免使用localhost或127.0.0.1这种路径測试。由于它会指向手机模拟器,你能够使用http://www.iteye.cn或http://192.168.1.101:8083这种路径測试)
         * @param params 请求參数 key为參数名,value为參数值
         * @param file 上传文件
         */
        public static boolean post(String path, Map<String, String> params, FormFile[] files) throws Exception{     
            final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线
            final String endline = "--" + BOUNDARY + "--
    ";//数据结束标志
            
            int fileDataLength = 0;
            for(FormFile uploadFile : files){//得到文件类型数据的总长度
                StringBuilder fileExplain = new StringBuilder();
                 fileExplain.append("--");
                 fileExplain.append(BOUNDARY);
                 fileExplain.append("
    ");
                 fileExplain.append("Content-Disposition: form-data;name=""+ uploadFile.getParameterName()+"";filename=""+ uploadFile.getFilname() + ""
    ");
                 fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"
    
    ");
                 fileExplain.append("
    ");
                 fileDataLength += fileExplain.length();
                if(uploadFile.getInStream()!=null){
                    fileDataLength += uploadFile.getFile().length();
                 }else{
                     fileDataLength += uploadFile.getData().length;
                 }
            }
            StringBuilder textEntity = new StringBuilder();
            for (Map.Entry<String, String> entry : params.entrySet()) {//构造文本类型參数的实体数据
                textEntity.append("--");
                textEntity.append(BOUNDARY);
                textEntity.append("
    ");
                textEntity.append("Content-Disposition: form-data; name=""+ entry.getKey() + ""
    
    ");
                textEntity.append(entry.getValue());
                textEntity.append("
    ");
            }
            //计算传输给server的实体数据总长度
            int dataLength = textEntity.toString().getBytes().length + fileDataLength +  endline.getBytes().length;
            
            URL url = new URL(path);
            int port = url.getPort()==-1 ?

    80 : url.getPort(); Socket socket = new Socket(InetAddress.getByName(url.getHost()), port); OutputStream outStream = socket.getOutputStream(); //以下完毕HTTP请求头的发送 String requestmethod = "POST "+ url.getPath()+" HTTP/1.1 "; outStream.write(requestmethod.getBytes()); String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */* "; outStream.write(accept.getBytes()); String language = "Accept-Language: zh-CN "; outStream.write(language.getBytes()); String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ " "; outStream.write(contenttype.getBytes()); String contentlength = "Content-Length: "+ dataLength + " "; outStream.write(contentlength.getBytes()); String alive = "Connection: Keep-Alive "; outStream.write(alive.getBytes()); String host = "Host: "+ url.getHost() +":"+ port +" "; outStream.write(host.getBytes()); //写完HTTP请求头后依据HTTP协议再写一个回车换行 outStream.write(" ".getBytes()); //把全部文本类型的实体数据发送出来 outStream.write(textEntity.toString().getBytes()); //把全部文件类型的实体数据发送出来 for(FormFile uploadFile : files){ StringBuilder fileEntity = new StringBuilder(); fileEntity.append("--"); fileEntity.append(BOUNDARY); fileEntity.append(" "); fileEntity.append("Content-Disposition: form-data;name=""+ uploadFile.getParameterName()+"";filename=""+ uploadFile.getFilname() + "" "); fileEntity.append("Content-Type: "+ uploadFile.getContentType()+" "); outStream.write(fileEntity.toString().getBytes()); if(uploadFile.getInStream()!=null){ byte[] buffer = new byte[1024]; int len = 0; while((len = uploadFile.getInStream().read(buffer, 0, 1024))!=-1){ outStream.write(buffer, 0, len); } uploadFile.getInStream().close(); }else{ outStream.write(uploadFile.getData(), 0, uploadFile.getData().length); } outStream.write(" ".getBytes()); } //以下发送数据结束标志。表示数据已经结束 outStream.write(endline.getBytes()); BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); if(reader.readLine().indexOf("200")==-1){//读取webserver返回的数据,推断请求码是否为200。假设不是200,代表请求失败 return false; } outStream.flush(); outStream.close(); reader.close(); socket.close(); return true; } /** *单文件上传 * 提交数据到server * @param path 上传路径(注:避免使用localhost或127.0.0.1这种路径測试,由于它会指向手机模拟器,你能够使用http://www.itcast.cn或http://192.168.1.10:8080这种路径測试) * @param params 请求參数 key为參数名,value为參数值 * @param file 上传文件 */ public static boolean post(String path, Map<String, String> params, FormFile file) throws Exception{ return post(path, params, new FormFile[]{file}); } }


    FormFile类的代码例如以下

    public class FormFile {
        /* 上传文件的数据 */
        private byte[] data;
        private InputStream inStream;
        private File file;
        
        private int fileSize;
        /* 文件名 */
        private String filname;
        /* 请求參数名称*/
        private String parameterName;
        /* 内容类型 */
        private String contentType = "application/octet-stream";
        
        public FormFile(String filname, byte[] data, String parameterName, String contentType) {
            this.data = data;
            this.filname = filname;
            this.parameterName = parameterName;
            if(contentType!=null) this.contentType = contentType;
        }
        
        public FormFile(String filname, File file, String parameterName, String contentType) {
            this.filname = filname;
            this.parameterName = parameterName;
            this.file = file;
            try {
                this.inStream = new FileInputStream(file);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            if(contentType!=null) this.contentType = contentType;
        }
        
        
        
        public FormFile(InputStream inStream, int fileSize, String filname,
    			String parameterName, String contentType) {
    		super();
    		this.inStream = inStream;
    		this.fileSize = fileSize;
    		this.filname = filname;
    		this.parameterName = parameterName;
    		this.contentType = contentType;
    	}
        
        
    
    	public int getFileSize() {
    		return fileSize;
    	}
    
    	public File getFile() {
            return file;
        }
    
        public InputStream getInStream() {
            return inStream;
        }
    
        public byte[] getData() {
            return data;
        }
    
        public String getFilname() {
            return filname;
        }
    
        public void setFilname(String filname) {
            this.filname = filname;
        }
    
        public String getParameterName() {
            return parameterName;
        }
    
        public void setParameterName(String parameterName) {
            this.parameterName = parameterName;
        }
    
        public String getContentType() {
            return contentType;
        }
    
        public void setContentType(String contentType) {
            this.contentType = contentType;
        }
        
    }

    注:以上android端上传代码是从网上借用的。对原作者表示感谢。
         以上代码经本人測试,能正常进行多文件上传。

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  • 原文地址:https://www.cnblogs.com/ldxsuanfa/p/10487246.html
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