服务器图片文件列表提取

淡淡的烟草味﹌ 2022-09-15 11:47 111阅读 0赞

先看看效果

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAc2ljaHVhbnd3dw_size_12_color_FFFFFF_t_70_g_se_x_16][] ![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAc2ljaHVhbnd3dw_size_12_color_FFFFFF_t_70_g_se_x_16 1][]

利用下拉列表，显示获取的图片文件列表，然后选择图片进行显示

获取服务器端图片文件列表需要移动端和服务端的双向配合

1 服务器端代码

using Newtonsoft.Json;  //C#中处理JSON
    
    public partial class Default5 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string userFile = "D:\\phpstudy_pro\\WWW\\WebSite2\\WxpPic";
                DirectoryInfo root = new DirectoryInfo(userFile);
                FileInfo[] files = root.GetFiles();
    
    
                //输出图片文件列表
                Dictionary<string, string> dic = new Dictionary<string, string>();
                int iCount=files.Count();
                if (iCount>0)
                {
                    for(int i=0;i<iCount;i++)               
                        dic.Add(Convert.ToString(i+1), files[i].ToString());
                }
                string jsonString = JsonConvert.SerializeObject(dic);
                Response.Clear();
                Response.ContentType = "application/json; charset=utf-8";
                Response.Write(jsonString);
                Response.End();       
            }
    
        }
    }

2 移动端代码

//需要一个全局变量数组
     public String[] WxpPicArray2;
    
    //调用函数
    //获取图片列表
        private void WxpGetPiclist()
        {
            //获取图片列表
            String url = "http://x.x.x.x/default5.aspx";
            WxpGetNetworkPiclistTask mTask = new WxpGetNetworkPiclistTask();
            mTask.execute(url);
        }

实现功能的异步线程类 WxpGetNetworkPiclistTask

//获取网络图片列表异步线程类
        private class WxpGetNetworkPiclistTask extends AsyncTask<String, Integer, String> {
    
            @Override
            protected void onPostExecute(String result) {
                //最终结果的显示
                //mTvProgress.setText(result);
                tx.setText(result);
                //声明一个下拉列表的数组适配器
                ArrayAdapter<String> starAdapter = new ArrayAdapter<String>(getActivity(),R.layout.item_select,WxpPicArray2);
                //设置数组适配器的布局样式
                starAdapter.setDropDownViewResource(R.layout.item_dropdown);
                //设置下拉框的标题，不设置就没有难看的标题了
                spList.setPrompt("请选择图片");
                //设置下拉框的数组适配器
                spList.setAdapter(starAdapter);
                //设置下拉框默认的显示第一项
                spList.setSelection(0);
            }
    
            @Override
            protected void onPreExecute() {
                //开始前的准备工作
                //mTvProgress.setText("loading...");
                tx.setText("loading .....");
                WxpPicArray2= new String[]{};
            }
    
            @Override
            protected void onProgressUpdate(Integer... values) {
                //显示进度
                // mPgBar.setProgress(values[0]);
                // mTvProgress.setText("loading..." + values[0] + "%");
                tx.setText("loading:" + values[0] + "%");
            }
    
            @Override
            protected String doInBackground(String... params) {
                //这里params[0]和params[1]是execute传入的两个参数
                String url = params[0];
                BufferedReader bufferedReader = null;
                try {
                    url = url + "";
    
                    tx.setText("位置信息");
                    URL httpUrl = new URL(url);
                    HttpURLConnection httpURLConnection = (HttpURLConnection) httpUrl.openConnection();
                    //设置请求头header
                    httpURLConnection.setRequestMethod("GET");
                    //设置请求头header
                    httpURLConnection.setRequestProperty("test-header", "get-header-value");
                    httpURLConnection.setReadTimeout(5000);
    
                    //获取内容
                    InputStream inputStream = httpURLConnection.getInputStream();
                    bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                    final StringBuffer stringBuffer = new StringBuffer();
                    String line = null;
                    while ((line = bufferedReader.readLine()) != null) {
                        stringBuffer.append(line);
                    }
                    //解析JSON
                    JSONObject jsonObject = new JSONObject(stringBuffer.toString());
                    Iterator<?> it = jsonObject.keys();
                    String keys = "";
                    String vals = null;
                    String sourceStr = "";
                    List<String> listPicname=new ArrayList<String>();
    
                    //遍历keys
                    while (it.hasNext()) {//遍历JSONObject
                        keys = (String) it.next().toString();
                        // sourceStr = sourceStr + jsonObject.get(keys).toString() + ";";
                        listPicname.add(jsonObject.get(keys).toString());
                    }
                    WxpPicArray2=listPicname.toArray(new String[listPicname.size()]);
    
                    return "success";
    
                } catch (Exception e) {
                    e.printStackTrace();
                    return (e.toString());
                }
            }
    
        }

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