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实现多文件的上传，基于标准的http来实现。
- 多文件上传MyUploader类的实现：
/**
*
* 同步上传多个文件
* 基于标准的http实现，需要在非UI线程中调用，以免阻塞UI。
*
*/
public class MyUploader {
private static final String TAG = "MyUploader";
// ////////////////////同步上传多个文件/////////
/**
* 同步上传File
*
* @param Url
* @param fullFileName
* : 全路径，ex. /sdcard/f/yh.jpg
* @param fileName
* : file name, ex. yh.jpg
* @return 服务器的响应结果(字符串形式)
*/
public String MyUploadMultiFileSync(String Url,
List<String> fileList, Map<String, String> params) {
String reulstCode = "";
String end = "\r\n";
String twoHyphens = "--";
String boundary = "--------boundary";
try {
URL url = new URL(actionUrl);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
// 允许Input、Output，不使用Cache
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
// 设置传送的method=POST
con.setRequestMethod("POST");
// setRequestProperty
con.setRequestProperty("Connection", "Keep-Alive");
con.setRequestProperty("Charset", "UTF-8");
// con.setRequestProperty("Content-Type",
// "application/x-www-form-urlencoded");
con.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
StringBuffer s = new StringBuffer();
// 设置DataOutputStream
DataOutputStream dos = new DataOutputStream(con.getOutputStream());
for (int i = 0; i < fileList.size(); i++) {
String filePath = fileList.get(i);
int endFileIndex = filePath.lastIndexOf("/");
String fileName = filePath.substring(endFileIndex + 1);
Log.i(TAG, "filename= " + fileName);
// set 头部
StringBuilder sb = new StringBuilder();
sb.append(twoHyphens);
sb.append(boundary);
sb.append(end);
sb.append("Content-Disposition: form-data; ");
sb.append("name=" + "\"" + "upload_file" +i + "\"");
sb.append(";filename=");
sb.append("\"" + fileName + "\"");
sb.append(end);
sb.append("Content-Type: ");
sb.append("image/jpeg");
sb.append(end);
sb.append(end);
// 1. write sb
dos.writeBytes(sb.toString());
// 取得文件的FileInputStream
FileInputStream fis = new FileInputStream(filePath);
// 设置每次写入1024bytes
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int length = -1;
// 从文件读取数据至缓冲区
while ((length = fis.read(buffer)) != -1) {
dos.write(buffer, 0, length);
}
dos.writeBytes(end);
fis.close();
dos.writeBytes(end);
dos.writeBytes(end);
//dos.writeBytes(end);
//dos.flush();
// close streams
//fis.close();
}
// set 尾部
StringBuilder sb2 = new StringBuilder();
if (params != null && !params.isEmpty()) {
for (String key : params.keySet()) {
String value = params.get(key);
sb2.append(twoHyphens);
sb2.append(boundary);
sb2.append(end);
sb2.append("Content-Disposition: form-data; ");
sb2.append("name=" + "\"");
sb2.append(key + "\"");
sb2.append(end);
sb2.append(end);
sb2.append(value);
sb2.append(end);
}
}
sb2.append(twoHyphens + boundary + end);
dos.writeBytes(sb2.toString());
dos.flush();
Log.i(TAG, "sb2:" + sb2.toString());
// 取得Response内容
InputStream is = con.getInputStream();
int ch;
StringBuffer b = new StringBuffer();
while ((ch = is.read()) != -1) {
b.append((char) ch);
}
reulstCode = b.toString().trim();
// 关闭
dos.close();
} catch (IOException e) {
Log.i(TAG, "IOException: " + e);
e.printStackTrace();
}
return reulstCode;
}
}
2. 调用方法：
由于MyUploader的MyUploadMultiFileSync本身是同步的函数请求，所以，这个函数需要在非UI线程中执行。本例采用Thread+Handler的方式来进行说明。
下面是activity的主要代码,功能是将cache目录中的的jpg文件上传到指定的服务器：
public void uploadThreadTest() {
new Thread(new Runnable() {
@Override
public void run() {
try {
upload();
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
private void upload() {
String url = "https://httpbin.org/post";
List<String> fileList = getCacheFiles();
if (fileList == null) {
myHandler.sendEmptyMessage(-1);
}else {
MyUploader myUpload = new MyUploader();
//同步请求，直接返回结果，根据结果来判断是否成功。
String reulstCode = myUpload.MyUploadMultiFileSync(url, fileList, null);
Log.i(TAG, "upload reulstCode: " + reulstCode);
myHandler.sendEmptyMessage(0);
}
}
private List<String> getCacheFiles() {
List<String> fileList = new ArrayList<String>();
File catchPath = mContext.getCacheDir();
if (catchPath!=null && catchPath.isDirectory()) {
File[] files = catchPath.listFiles();
if (files == null || files.length<1) {
return null;
}
for (int i = 0; i < files.length; i++) {
if (files[i].isFile() && files[i].getAbsolutePath().endsWith(".jpg")) {
fileList.add(files[i].getAbsolutePath());
}
}
return fileList;
}
return null;
}
////////////handler/////
private Handler myHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
Log.i(TAG,"handleMessage msg===" + msg);
if (msg.what == -1) {
Toast.makeText(mContext, "not find file!", Toast.LENGTH_LONG).show();
return;
}else {
Toast.makeText(mContext, "upload success!", Toast.LENGTH_LONG).show();
}
}
};