編輯:關於android開發
問題背景:app在上傳圖片時,同時傳遞參數,支持傳遞多個圖片。本文中的環境默認已經配好了服務器的CodeIgniter框架。事實上不使用這個框架也是可以的。
1,在controllers下的helpers新建文件upload_helper.php
* For use files[ ] input name you must use it method. * * @author porquero * * @example * In Controller * $this->load->helper('upload'); * multifile_array(); * foreach ($_FILES as $file => $file_data) { * $this->upload->do_upload($file); * ... * * @link http://porquero.blogspot.com/2012/05/codeigniter-multifilearray-upload.html */ function multifile_array() { if(count($_FILES) == 0) return; $files = array(); $all_files = $_FILES['f_file']['name']; $i = 0; foreach ((array)$all_files as $filename) { $files[++$i]['name'] = $filename; $files[$i]['type'] = current($_FILES['f_file']['type']); next($_FILES['f_file']['type']); $files[$i]['tmp_name'] = current($_FILES['f_file']['tmp_name']); next($_FILES['f_file']['tmp_name']); $files[$i]['error'] = current($_FILES['f_file']['error']); next($_FILES['f_file']['error']); $files[$i]['size'] = current($_FILES['f_file']['size']); next($_FILES['f_file']['size']); } $_FILES = $files; }
a.注意裡面的key為'f_file',這就要求app或web在上傳,建表單的時候將此值對應上。
b.該文件主要是遍歷$_FILES,通過current得到當前file的信息轉存到數組裡,然後返回。注意轉存後索引是從1開始的。轉存的字段有name/type/tmp_name/error/size,使用next移動$_FILES['f_file']['key']的指針。
2.views裡新建upload_form.php,用來在web上模擬測試上傳是否成功:
a,這裡使用了CI框架的form_open_multipart新建一個multipart的表單,訪問的是控制器upload裡的web_upload方法,第三個參數$data,用於模擬向服務器傳遞的post請求參數。當然你也可以在下面加幾個.
b,input裡name對應的是f_file[],這個是跟 服務器那邊統一好的。
c,若要支持多文件上傳加上multiple=multiple,不加的話一次只能上傳一個文件。
3,views下新建upload_success.php,顯示上傳成功後的界面。
4,接下來是最關鍵的一個類,在controllers文件夾下新建Upload.php,這是個控制器,上傳最核心的。
load->helper(array('form', 'url', 'upload')); //$this->load->model('picture_model'); } public function index() { $this->load->view('upload_form', array('error' => ' ' )); } public function app_upload(){ $this->init_argc(); multifile_array(); foreach ($_FILES as $file => $file_data){ $this->do_upload($file); } if($this->m_error == NULL || count($this->m_error) == 0){ $this->output->set_output(json_encode(array('msg'=>'上傳成功'))); }else{ $this->output->set_output(json_encode($this->m_error)); } } public function do_upload($file) { $config['upload_path'] = $this->m_path; $config['allowed_types'] = 'gif|jpg|png|jpeg'; $config['max_size'] = 10240; $config['max_width'] = 2000; $config['max_height'] = 2000; $config['file_name'] = Util::random_str(); $this->load->library('upload', $config); if ( ! $this->upload->do_upload($file)){ $this->on_upload_error($this->upload->display_errors()); } else{ $upload_data = $this->upload->data(); $this->on_upload_success($upload_data['file_name']); } } public function do_upload2($file) { $config['upload_path'] = $this->m_path; $config['allowed_types'] = 'gif|jpg|png|jpeg'; $config['max_size'] = 10240; $config['max_width'] = 2000; $config['max_height'] = 2000; $config['file_name'] = Util::random_str(); $this->load->library('upload', $config); if ( ! $this->upload->do_upload($file)) { $error = array('error' => $this->upload->display_errors()); $this->load->view('upload_form', $error); } else { $data = array('upload_data' => $this->upload->data()); $this->load->view('upload_success', $data); } } public function web_upload() { multifile_array(); foreach ($_FILES as $file => $file_data){ $this->do_upload2($file); } } private function init_argc() { $this->m_type = $this->getPost('type'); $this->m_id = $this->getPost('id'); $this->m_path = $this->getPath($this->m_type); } private function getPath($type){ $path = './application/cache/image/shop'; if($type == shop){ $path = './application/cache/image/shop'; } return $path; } private function on_upload_success($name){ if($this->m_type == 'shop'){ //$this->picture_model->add_shop_picture($this->m_id, $this->m_type, $name); }else if($this->m_type == 'avatar'){ //$this->picture_model->add_user_avatar($this->m_id, $this->m_type, $name); } } private function on_upload_error($error){ $this->m_error['msg'] = $error; } } ?>解釋如下:
a,這裡Upload是繼承的BASE_CI_Controller,也可以換成CI_Controller,在自己的Base_CI_Controller裡封裝了自己項目一些常用的安全校驗邏輯;
b,我定義了m_type記錄上傳圖片的類型,m_id是圖片所屬對象的id,m_path為路徑,根據type不同路徑可以做區分。m_error紀錄錯誤。在構造函數裡,注意把幾個helper都load進來。除此外我還寫了個Picture_model用來操作圖片相關的數據庫,如果不需要這個model,可以注釋掉。
c,app_load()是暴露給app用來上傳的,init_argc()初始化post傳來的各種參數。然後就是調multifile_array();之後遍歷上傳。待上傳完畢後根據m_error裡是否為空,判斷是該顯示什麼消息給app。在do_upload()裡的Util::random_str()是個很簡單的對時間戳md5,防止圖片名字一樣:
Util裡的代碼:
/** * 產生新的token * @return string */ public static function token(){ $curr = Util::time(); return md5($curr); } public static function random_str(){ return Util::token(); }
每次上傳成功後都調on_upload_success() on_upload_error()進行更新數據庫等操作。其中on_upload_success()要接收$upload_data['file_name']),表示上傳成功後的文件的名字。
d,web_upload是給web上傳圖片用的,通過do_upload2()上傳成功後就加載一個view來顯示上傳後的信息。PS:保證你對目的文件夾有可寫權限。先用web測試下效果:http://localhost/~yanzi/city52/index.php/upload
這個比較簡單,基於volley封裝的,MultipartRequest.java
package com.android.nomnom.volley; import android.util.Log; import com.android.volley.AuthFailureError; import com.android.volley.NetworkResponse; import com.android.volley.Request; import com.android.volley.Response; import com.android.volley.VolleyLog; import com.android.volley.toolbox.HttpHeaderParser; import org.apache.http.entity.mime.MultipartEntity; import org.apache.http.entity.mime.content.FileBody; import org.apache.http.entity.mime.content.StringBody; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; /** * 功能: * * @author yanzi E-mail: [email protected] * @version 創建時間: 2015-08-09 下午4:32 */ public class MultipartRequest extends Request{ private MultipartEntity entity = new MultipartEntity(); private Response.Listener mListener; private List mFileParts; private String mFilePartName; private Map mParams; /** * 單個文件+參數 上傳 * @param url * @param listener * @param errorListener * @param filePartName * @param file * @param params */ public MultipartRequest(String url, Response.Listener listener, Response.ErrorListener errorListener, String filePartName, File file, Map params){ super(Method.POST, url, errorListener); mFileParts = new ArrayList (); if(file != null && file.exists()){ mFileParts.add(file); }else{ VolleyLog.e(MultipartRequest---file not found); } mFilePartName = filePartName; mListener = listener; mParams = params; buildMultipartEntity(); } /** * 多個文件+參數上傳 * @param url * @param listener * @param errorListener * @param filePartName * @param files * @param params */ public MultipartRequest(String url,Response.Listener listener,Response.ErrorListener errorListener , String filePartName,List files, Map params) { super(Method.POST, url, errorListener); mFilePartName = filePartName; mListener = listener; mFileParts = files; mParams = params; buildMultipartEntity(); } @Override protected Response parseNetworkResponse(NetworkResponse response) { String parsed; try { parsed = new String(response.data, HttpHeaderParser.parseCharset(response.headers)); } catch (UnsupportedEncodingException e) { parsed = new String(response.data); } return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response)); } @Override protected void deliverResponse(String response) { mListener.onResponse(response); } @Override public Map getHeaders() throws AuthFailureError { Map headers = super.getHeaders(); if (headers == null || headers.equals(Collections.emptyMap())) { headers = new HashMap (); } return headers; } @Override public String getBodyContentType() { return entity.getContentType().getValue(); } @Override public byte[] getBody() throws AuthFailureError { ByteArrayOutputStream bos = new ByteArrayOutputStream(); try{ entity.writeTo(bos); } catch (IOException e) { VolleyLog.e(IOException writing to ByteArrayOutputStream); } return bos.toByteArray(); } private void buildMultipartEntity() { if (mFileParts != null && mFileParts.size() > 0) { for (File file : mFileParts) { entity.addPart(mFilePartName, new FileBody(file)); } long l = entity.getContentLength(); Log.i(YanZi-volley, mFileParts.size() + 個,長度: + l); } try { if (mParams != null && mParams.size() > 0) { for (Map.Entry entry : mParams.entrySet()) { entity.addPart( entry.getKey(), new StringBody(entry.getValue(), Charset .forName(UTF-8))); } } } catch (UnsupportedEncodingException e) { VolleyLog.e(UnsupportedEncodingException); } } }
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