Android上传图片，PHP接收

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上传图片到服务器是一个很常见的需求，这里给出一种简单的实现方式：

服务器端

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<?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'];
}

上面的代码保存为 FileUploader.php,放入服务器的api\datas目录，并在该目录下新建 upload文件夹；当然你也可以直接在PHP代码中检查是否有upload目录，没有可以直接使用代码新建。
这样操作之后，我们的要上传文件操作的URL就为：http://dxjia.cn/api/datas/FileUploader.php，你也可以按照此方法来制定你自己的访问URL。

Android客户端

测试图片路径直接hardcode写死啦:

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private static final String srcPath = "/sdcard/test.jpg";
private static final String actionUrl = "http://dxjia.cn/api/datas/FileUpload.php";

绑定按钮

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mUpdateHandler = new UpdateHandler(this);

testButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        doAction();
    }
});

网络操作不能在主线程中进行，需要新开thread

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private void doAction() {
    new Thread(new Runnable() {
        @Override
        public void run() {
            uploadFile(actionUrl);
        }
    }).start();
}

主体函数，完成文件上传post，注意form-data; name=\"uploadedfile\"，跟服务器端的必须保持一致。

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/* 上传文件至Server，uploadUrl：接收文件的处理页面 */
private void uploadFile(String uploadUrl) {
    mUpdateHandler.sendEmptyMessage(EVENT_POST_START);
    String end = "\r\n";
    String twoHyphens = "--";
    String boundary = "******";
    try {
        URL url = new URL(uploadUrl);
        HttpURLConnection httpURLConnection = (HttpURLConnection) url
                .openConnection();
        // 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");
        httpURLConnection.setRequestProperty("Charset", "UTF-8");
        httpURLConnection.setRequestProperty("Content-Type",
                "multipart/form-data;boundary=" + boundary);

        DataOutputStream dos = new DataOutputStream(
                httpURLConnection.getOutputStream());
        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);
        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();
        InputStreamReader isr = new InputStreamReader(is, "utf-8");
        BufferedReader br = new BufferedReader(isr);
        String result = br.readLine();
        Log.d("dxjia", result);

        mUpdateHandler.sendEmptyMessage(EVENT_POST_SUCCESS);

        dos.close();
        is.close();

    } catch (Exception e) {
        mUpdateHandler.sendEmptyMessage(EVENT_POST_FAILED);
        e.printStackTrace();
    }
}

更新UI的handler

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/**
 * UI update handler
 */
private class UpdateHandler extends Handler {
    private final Context mContext;

    public UpdateHandler(Context context) {
        mContext = context;
    }

    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case EVENT_POST_START:
                resultTextView.setText("Started! uploading...");
                break;
            case EVENT_POST_FAILED:
                resultTextView.setText("upload failed!");
                break;
            case EVENT_POST_SUCCESS:
                resultTextView.setText("upload done!");
                break;
        }

        super.handleMessage(msg);
    }
}

Reference

[1]. http://blog.csdn.net/sxwyf248/article/details/7012496
[2]. http://blog.csdn.net/fancylovejava/article/details/13506745