原理
Android客户端模拟一个HTTP的Post请求到服务器端，服务器端接收相应的Post请求后，返回响应信息给给客户端。
背景
网上很多上传到java服务器上的，找了好久，找到了上传到php的了，思路跟我当初想的差不多，就是POST过去。废话不多说，直接上图看代码。
php代码
<?php
$target_path = "./upload/";//接收文件目录
$target_path = $target_path . basename( $_FILES['uploadedfile']['name']);
if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded";
} else{
echo "There was an error uploading the file, please try again!" . $_FILES['uploadedfile']['error'];
}
?>
Android代码
上传的主要代码:
private void uploadFile(String uploadUrl)
{
String end = "\r\n";
String twoHyphens = "--";
String boundary = "******";
try
{
URL url = new URL(uploadUrl);
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection();//http连接
// 设置每次传输的流大小，可以有效防止手机因为内存不足崩溃
// 此方法用于在预先不知道内容长度时启用没有进行内部缓冲的 HTTP 请求正文的流。
httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K
// 允许输入输出流
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setUseCaches(false);
// 使用POST方法
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Connection", "Keep-Alive");//保持一直连接
httpURLConnection.setRequestProperty("Charset", "UTF-8");//编码
httpURLConnection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);//POST传递过去的编码
DataOutputStream dos = new DataOutputStream(
httpURLConnection.getOutputStream());//输出流
dos.writeBytes(twoHyphens + boundary + end);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\""
+ srcPath.substring(srcPath.lastIndexOf("/") + 1)
+ "\""
+ end);
dos.writeBytes(end);
FileInputStream fis = new FileInputStream(srcPath);//文件输入流，写入到内存中
byte[] buffer = new byte[8192]; // 8k
int count = 0;
// 读取文件
while ((count = fis.read(buffer)) != -1)
{
dos.write(buffer, 0, count);
}
fis.close();
dos.writeBytes(end);
dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
dos.flush();
InputStream is = httpURLConnection.getInputStream();//http输入，即得到返回的结果
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
String result = br.readLine();
Toast.makeText(this, result, Toast.LENGTH_LONG).show();//将结果输出
dos.close();
is.close();
} catch (Exception e)
{
e.printStackTrace();
setTitle(e.getMessage());
}
}
因为安卓4.0之后耗时间的操作要求都在非UI线程中操作，即将前面的AsyncTask拿来用了吧~
AsyncTask传送门：https://www.jb51.net/article/77155.htm
在这个类中，将上传的操作放在doInBackground当中，可以有ProgressDialog显示上传了多少：
// Read file
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
outputStream.write(buffer, 0, bufferSize);
length += bufferSize;
progress = (int) ((length * 100) / totalSize);
publishProgress(progress);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens
+ lineEnd);
publishProgress(100);
还有就是，注意权限哟：
<uses-permission android:name="android.permission.INTERNET" />
以上内容给大家介绍了Android异步上传图片到PHP服务器，希望本文分享能够给大家带来帮助。
