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);

Android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:
     *   <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<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()) {//构造文本类型参数的实体数据
            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
";
        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请求头后根据HTTP协议再写一个回车换行
        outStream.write("
".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("
");
             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());
        }
        //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<String, String> 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。