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：

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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：

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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 + "--\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<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("\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<String, String> params, FormFile file) throws Exception{

return post(path, params, new FormFile[]{file});

}

}

FormFile类的代码如下

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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。