项目中多处用到文件批量上传功能，今天正好解决了此问题，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.android客户端+springMVC服务端：服务端采用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，最终服务端只会接受到一个文件，即只会接受到第一个文件。可能因为MultipartHttpServletRequest对servlet原本的HttpServletRequest类进行封装，导致批量上传有问题。2.android客户端+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。如果有网友采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：采用android客户端+Servlet（HttpServletRequest）进行文件上传。Servlet端代码如下：

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("表单参数名:" + item.getFieldName() + "，表单参数值:" + 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()返回上传文件在客户端的完整路径名称                        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);

端代码如下：

public class SocketHttpRequester {    /**     *多文件上传     * 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能:     *   
     
            
                  
                  
                  
               
     
     * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.iteye.cn或http://192.168.1.101:8083这样的路径测试)     * @param params 请求参数 key为参数名,value为参数值     * @param file 上传文件     */    public static boolean post(String path, Map
     
       params, FormFile[] files) throws Exception{             final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线        final String endline = "--" + BOUNDARY + "--\r\n";//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("\r\n");             fileExplain.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");             fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");             fileExplain.append("\r\n");             fileDataLength += fileExplain.length();            if(uploadFile.getInStream()!=null){                fileDataLength += uploadFile.getFile().length();             }else{                 fileDataLength += uploadFile.getData().length;             }        }        StringBuilder textEntity = new StringBuilder();        for (Map.Entry
      
        entry : params.entrySet()) {
   //构造文本类型参数的实体数据            textEntity.append("--");            textEntity.append(BOUNDARY);            textEntity.append("\r\n");            textEntity.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n");            textEntity.append(entry.getValue());            textEntity.append("\r\n");        }        //计算传输给服务器的实体数据总长度        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();        //下面完成HTTP请求头的发送        String requestmethod = "POST "+ url.getPath()+" HTTP/1.1\r\n";        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, */*\r\n";        outStream.write(accept.getBytes());        String language = "Accept-Language: zh-CN\r\n";        outStream.write(language.getBytes());        String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ "\r\n";        outStream.write(contenttype.getBytes());        String contentlength = "Content-Length: "+ dataLength + "\r\n";        outStream.write(contentlength.getBytes());        String alive = "Connection: Keep-Alive\r\n";        outStream.write(alive.getBytes());        String host = "Host: "+ url.getHost() +":"+ port +"\r\n";        outStream.write(host.getBytes());        //写完HTTP请求头后根据HTTP协议再写一个回车换行        outStream.write("\r\n".getBytes());        //把所有文本类型的实体数据发送出来        outStream.write(textEntity.toString().getBytes());                   //把所有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("\r\n");             fileEntity.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");             fileEntity.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");             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("\r\n".getBytes());        }        //下面发送数据结束标志，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web服务器返回的数据，判断请求码是否为200，如果不是200，代表请求失败            return false;        }        outStream.flush();        outStream.close();        reader.close();        socket.close();        return true;    }        /**     *单文件上传     * 提交数据到服务器     * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)     * @param params 请求参数 key为参数名,value为参数值     * @param file 上传文件     */    public static boolean post(String path, Map
       
         params, FormFile file) throws Exception{       return post(path, params, new FormFile[]{file});    }}
       
      
     

FormFile类的代码如下

public class FormFile {    /* 上传文件的数据 */    private byte[] data;    private InputStream inStream;    private File file;        private int fileSize;    /* 文件名称 */    private String filname;    /* 请求参数名称*/    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！　　以上代码经本人测试，能正常进行多文件上传。