我有一个要求，我将一个 json 文件发送到服务器，并且解析发生在服务器端。我已经创建了 json 文件的条目，现在我想将存储在 imageview 中的图像存储为 json 文件的条目。搜索了几个以前的帖子，但找不到确切的内容。任何指针对于以 json 格式存储图像以通过服务器发送都会有很大帮助。
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18219 次
4 回答
10
如果您想将 Image 包含在您将在请求中发送的 JSON 对象中，请将 Image 转换为 Base64 字符串并将此字符串放入 JSON 对象中。
例如：
String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);
查看：
于 2013-03-22T08:41:53.823 回答
2
尝试对图像进行 base64 编码（如下所示，Uri 是您的图像 - 但请注意：ImageView 没有用于 ImageUri 的 Getter，因此您必须自己存储它！）：
Uri uri = (Uri) extras.getParcelable(Intent.EXTRA_STREAM);
ContentResolver cr = getContentResolver();
InputStream is = cr.openInputStream(uri);
byte[] data = getBytesFromFile(is);
byte[] encoded_data = Base64.encodeBase64(data);
data_string = new String(encoded_data);
现在您有了一个 base64 编码的字符串data_string，您可以将它与您的 JSON 请求一起发送。在服务器端，您只需解码字符串并保存图片。
于 2013-03-22T08:40:26.800 回答
1
嗯，这是一种实验性的方法，但是您可以从位图中创建一个字节数组，然后使用该字节数组创建一个新字符串，然后将其发送到服务器。
但是，为什么不直接发送一个 POST 请求来保存图像，而不进行任何实验处理或解析呢？
于 2013-03-22T08:40:19.403 回答
0
你有一个 ImageView
<ImageView
android:layout_width = "300dp"
android:layout_height = "300dp"
android:id = "@+id/Plaatjeid"
android:scaleType = "centerCrop"
android:text = "@string/BerttxtPlaatje"
android:layout_alignParentEnd="true"
/>
在代码隐藏中
String plaatje="";
ImageView iv1 = (ImageView)findViewById(R.id.Plaatjeid);
iv1.buildDrawingCache();
Bitmap bitmap = iv1.getDrawingCache();
ByteArrayOutputStream stream=new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
byte[] image=stream.toByteArray();
plaatje = Base64.encodeToString(image, 0);
然后你创建你的 Json 字符串
String mailMessage;
mailMessage="<?xml version='1.0'?>";
mailMessage=mailMessage + "<RiscNotification xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'";
mailMessage=mailMessage + "xmlns:xsd='htp://www.w3.org/2001/XMLSchema'>";
mailMessage = mailMessage + " <mail To>" + Mailto() + "</mail To>" ;//server7
mailMessage = mailMessage + "</RiskNotification>";
我有一个单独的类，我在其中发送它 将变量附加到类
GetMethodDemo JsonConnect = new GetMethodDemo();
JsonConnect.MailTo= Mailto();
JsonConnect.Picture=plaatje;
JsonConnect.bertactivity=this;
JsonConnect.execute();//staat in AANHET BEGIN
和我的班级
package nl.yentel.finekinney;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.view.Gravity;
import android.widget.Toast;
public class GetMethodDemo extends AsyncTask<String, Void, String> {
String MailTo;
String Picture;
Activity bertactivity;
Bitmap bm;
public void BitMapFoto(Bitmap bitmap) {
bm = bitmap;
}
//@Override
protected String doInBackground(String... strings) {
//http://geekonjava.blogspot.com/2014/03/upload-image-on-server-in-android-using.html
String dBresultaat = "start";
try {
URL url = new URL("http://10.0.2.2:64489/Risico/Risico.asmx/sendMail");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("Content-Type", "application/json");
con.setRequestProperty("Accept", "application/json");
con.setDoOutput(true);
String jsonInputString = "";
jsonInputString = "{";
jsonInputString = jsonInputString + "\"MailTo\": \"" + MailTo.toString() + "\",";
jsonInputString = jsonInputString + "\"Picture\": \"" + Picture.toString() + "\"";
//if you take the Picture.toString in debug mode and put it in https://base64.guru/converter/decode/image you see the picture
jsonInputString = jsonInputString + "}";
try (OutputStream os = con.getOutputStream()) {
byte[] input = jsonInputString.getBytes("utf-8");
os.write(input, 0, input.length);
int code = con.getResponseCode();
System.out.println(code);
try (BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "utf-8"))) {
StringBuilder response = new StringBuilder();
String responseLine = null;
while ((responseLine = br.readLine()) != null) {
response.append(responseLine.trim());
}
System.out.println(response.toString());
return response.toString();
}
} catch (Exception e) {
e.printStackTrace();
return "catch twee";
}
} catch (Exception e) {
e.printStackTrace();
return "catch";
}
}
@Override
protected void onPreExecute() {
}
@Override
protected void onPostExecute(String s) {
// super.onPostExecute(s);
Activity activity = new Bert().activity;
Toast toast = Toast.makeText(bertactivity, s, Toast.LENGTH_LONG);
toast.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
}
你应该在 Framework 4.0 中有你的 web 服务。框架 3.5 不起作用
和 web.config 显示
<configuration>
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="50000000"/>
</webServices>
</scripting>
</system.web.extensions>
<system.web>
我的网络方法看起来像这样
[WebMethod()]
public string sendMail(sstring MailTo, string Picture)
{
string Resultstring = "";
int i;
MailMessage theMessage;
theMessage = new MailMessage();
// look if there is an attempt to hack the server
if ((MailBody.ToUpper()).IndexOf("SELECT") > 0 | (MailBody.ToUpper()).IndexOf("UPDATE") > 0)
{
Resultstring = "illegal string";
}
else
{
theMessage.From = new System.Net.Mail.MailAddress(ConfigurationManager.AppSettings["sender"]); // '"no-reply@taakmonitor.nl")
try
{
theMessage.To.Add(new MailAddress(MailFrom)); // also send a mail to the sender
}
catch (Exception ex)
{
Resultstring = "Mail address "+ MailFrom + " not ok "; //ex.Message; // als het formaat van het mail adres niet goed is
theMessage = null;
}
String FransGetsCopy = WebConfigurationManager.AppSettings["FransGetsCopy"];
String[] ToWhom = NullSafeString(MailTo).Split(',');
for (i = 0; i <= ToWhom.Length - 1; i++)
{
try
{
theMessage.To.Add(new MailAddress(ToWhom[i]));
}
catch (Exception ex)
{
Resultstring = Resultstring + " mail address " + ToWhom[i] + " not ok "; //ex.Message; // als het formaat van het mail adres niet goed is
theMessage = null;
}
}
// there should also be a stylesheet
string StyleText="";
try
{
StyleText = "";
var data = File.ReadAllText(Server.MapPath("~/App_Data/TextFile.txt"));
StyleText = data.ToString();
}
catch (Exception)
{
Resultstring = Resultstring + " No StyleText available. ";
}
theMessage.Subject = MailSubject;
theMessage.IsBodyHtml = true;
//the message is created in HTML with the style in the <head> and the MailBody in the body
theMessage.Body = "<html>" + StyleText + "<body>" + MailBody + "</body></html>";
// code copied from
// https://www.codeproject.com/Tips/569532/Submit-Images-to-Web-Service-and-Get-Them-Back
//in this piece of code I convert the Json picture data to a picture and attach it to the mail
try
{
byte[] data = Convert.FromBase64String(Picture);
var stream = new MemoryStream(data, 0, data.Length);
System.Drawing.Image img = System.Drawing.Image.FromStream(stream);
stream.Seek(0L, SeekOrigin.Begin);
theMessage.Attachments.Add(new Attachment(stream, "Picture.png"));
Resultstring = Resultstring + " image OK";
}
catch (Exception ex)
{
Resultstring = Resultstring + " image not OK";
}
SmtpClient MessageObject = new SmtpClient();
MessageObject.Host = ConfigurationManager.AppSettings["Host"];
MessageObject.Port = Int32.Parse(ConfigurationManager.AppSettings["Port"]);
MessageObject.EnableSsl = false;
MessageObject.Credentials = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["Username"], ConfigurationManager.AppSettings["Password"]);
try
{
MessageObject.Send(theMessage);
Resultstring = Resultstring + " mail has been send.";
}
catch (Exception ex)
{
Resultstring = Resultstring + " mail has NOT been send.";
}
MessageObject = null;
theMessage = null;
}
return Resultstring;
}
最后我在附加的 App_data 文件夹中有一个样式表 TestFile.txt
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-=1">
<meta content="text/html; charset=us-ascii">
<style>
h1{color:blue;}
.EditText{
background:#ff0000;/*rood*/
height:100;
font-size:10px;
color:#0000ff;/*blauw*/
}
.EditTextVervolg{
background:#00cc00;/*groen*/
font-size:20px;
color:#ffff00;/*geel*/
}
</style>
</head>
玩得开心
于 2021-01-31T06:07:27.810 回答