Android 如何使用JSONParser实现上传图像的功能?

Android 如何使用JSONParser实现上传图像的功能?,android,json,image,upload,Android,Json,Image,Upload,我一直在研究Google或Stack Overflow上的许多帖子和教程,没有人真正使用JSONParser上传图像。我找到的所有代码都是用于网站而不是Android的 如何使用JSONParser上传图像 我希望能够从画廊上传照片,或者用相机拍摄照片,然后直接上传到我的应用程序中 JSONParser类如下所示: public class JSONParser { static InputStream is = null; static JSONObject jObj = n

我一直在研究Google或Stack Overflow上的许多帖子和教程,没有人真正使用
JSONParser
上传图像。我找到的所有代码都是用于网站而不是Android的

如何使用
JSONParser
上传图像

我希望能够从画廊上传照片,或者用相机拍摄照片,然后直接上传到我的应用程序中

JSONParser
类如下所示:

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String result = "";
    static String json = "";

    // constructor
    public JSONParser() {

    }


    public JSONObject makeHttpRequest(String url, String method,
            List<NameValuePair> params) {

        // Making HTTP request
        try {

            // check for request method
            if(method == "POST") {
                // request method is POST
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params));

                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();

            } else if(method == "GET") {
                // request method is GET
                DefaultHttpClient httpClient = new DefaultHttpClient();
                String paramString = URLEncodedUtils.format(params, "utf-8");
                url += "?" + paramString;
                HttpGet httpGet = new HttpGet(url);

                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            }           

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;
    }
}
公共类JSONParser{
静态InputStream为空;
静态JSONObject jObj=null;
静态字符串结果=”;
静态字符串json=“”;
//建造师
公共JSONParser(){
}
公共JSONObject makeHttpRequest(字符串url、字符串方法、,
列表参数){
//发出HTTP请求
试一试{
//检查请求方法
如果(方法==“POST”){
//请求方法为POST
//defaultHttpClient
DefaultHttpClient httpClient=新的DefaultHttpClient();
HttpPost HttpPost=新的HttpPost(url);
setEntity(新的UrlEncodedFormEntity(参数));
HttpResponse HttpResponse=httpClient.execute(httpPost);
HttpEntity HttpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}else if(方法==“GET”){
//请求方法是GET
DefaultHttpClient httpClient=新的DefaultHttpClient();
String paramString=URLEncodedUtils.format(params,“utf-8”);
url+=“?”+参数字符串;
HttpGet HttpGet=新的HttpGet(url);
HttpResponse HttpResponse=httpClient.execute(httpGet);
HttpEntity HttpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}           
}捕获(不支持的编码异常e){
e、 printStackTrace();
}捕获(客户端协议例外e){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
试一试{
BufferedReader reader=新的BufferedReader(新的InputStreamReader(is,“iso-8859-1”),8;
StringBuilder sb=新的StringBuilder();
字符串行=null;
而((line=reader.readLine())!=null){
sb.追加(第+行“\n”);
}
is.close();
json=sb.toString();
}捕获(例外e){
Log.e(“缓冲区错误”,“错误转换结果”+e.toString());
}
//尝试将字符串解析为JSON对象
试一试{
jObj=新的JSONObject(json);
}捕获(JSONException e){
Log.e(“JSON解析器”,“错误解析数据”+e.toString());
}
//返回JSON字符串
返回jObj;
}
}

我们可以通过传递参数来实现,但似乎没有人在使用它。实现中是否不可能或存在错误?

要将文件(图像、音频等)上载到服务器,您可能需要使用MultipartEntity。在线查找并下载这两个库:httpmime-4.0.jarapache-mime4j-0.4.jar,并将它们添加到项目中。下面是一个如何使用它的示例:

public void doUpload(File fileToUpload)
{
    HttpClient httpclient = new DefaultHttpClient();
    try {
        HttpPost httppost = new HttpPost(URL_UPLOAD_HERE);

        MultipartEntity entity = new MultipartEntity();
        entity.addPart("imgType", new StringBody(imgType));
        entity.addPart("imgFile", new FileBody(fileToUpload));

        httppost.setEntity(entity);

         //------------------ read the SERVER RESPONSE
        HttpResponse response = httpclient.execute(httppost);
        StatusLine statusLine = response.getStatusLine();
        Log.d("UploaderService", statusLine + "");
        int statusCode = statusLine.getStatusCode();
        if (statusCode == 200) {
            HttpEntity resEntity = response.getEntity();
            InputStream content = resEntity.getContent();

            BufferedReader reader = new BufferedReader(new InputStreamReader(content));
            String line;
            while (( line = reader.readLine()) != null)
            {
                Log.i("Debug","Server Response " + line);

                // try parse the string to a JSON object
                try {
                    jObj = new JSONObject(line);
                } catch (JSONException e) {
                    Log.e("JSON Parser", "Error parsing data " + e.toString());
                }
            }
            reader.close();
        } else {
            Log.e(UploaderService.class.toString(), "Failed to upload file");
        }  

    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
在服务器端,您可以使用这些实体标识符的名称“imgFile”和“imgType”来检索文件并对其进行处理。请注意,使用这些库,您还可以像我在示例中所做的那样随文件发送另一个参数(将“imgType”字符串附加到实体)

考虑在单独的线程(如AsyncTask)中运行此代码