使用POST和HttpURLConnection發(fā)送文件因為Android開發(fā)者推薦使用HttpURLConnection類時，我想知道是否有人可以提供一個很好的示例，說明如何通過POST將位圖“文件”(實際上是內(nèi)存中的流)發(fā)送到ApacheHTTP服務(wù)器。我對cookie或身份驗證或任何復(fù)雜的東西不感興趣，但我只想有一個可靠的邏輯實現(xiàn)。我在這里看到的所有例子看上去都更像是“讓我們試試這個，也許它是有用的”?，F(xiàn)在，我有這樣的代碼：URL url;HttpURLConnection urlConnection = null;try {
url = new URL("http://example.com/server.cgi");
urlConnection = (HttpURLConnection) url.openConnection();} catch (Exception e) {
this.showDialog(getApplicationContext(), e.getMessage());}finally {
if (urlConnection != null)
{
urlConnection.disconnect();
}}其中，showDialog應(yīng)該只顯示AlertDialog(如果URL無效？)?，F(xiàn)在，假設(shè)我生成了如下所示的位圖：Bitmap image = this.getBitmap()中派生的控件內(nèi)部。View我想通過郵寄出去。實現(xiàn)這一目標(biāo)的適當(dāng)程序是什么？我需要使用哪些類？我能用一下嗎HttpPost就像在這個例子？如果是這樣，我將如何構(gòu)造InputStreamEntity我的位圖？我會發(fā)現(xiàn)，要求首先將位圖存儲在設(shè)備上的文件中是令人反感的。我還應(yīng)該提到，我確實需要將原始位圖的每個未更改的像素發(fā)送到服務(wù)器，因此我無法將其轉(zhuǎn)換為JPEG。
3 回答
呼如林
TA貢獻(xiàn)1798條經(jīng)驗 獲得超3個贊
MultipartUtility
MultipartUtility.java
public class MultipartUtility {
private final String boundary;
private static final String LINE_FEED = "\r\n";
private HttpURLConnection httpConn;
private String charset;
private OutputStream outputStream;
private PrintWriter writer;
/**
* This constructor initializes a new HTTP POST request with content type
* is set to multipart/form-data
*
* @param requestURL
* @param charset
* @throws IOException
*/
public MultipartUtility(String requestURL, String charset)
throws IOException {
this.charset = charset;
// creates a unique boundary based on time stamp
boundary = "===" + System.currentTimeMillis() + "===";
URL url = new URL(requestURL);
Log.e("URL", "URL : " + requestURL.toString());
httpConn = (HttpURLConnection) url.openConnection();
httpConn.setUseCaches(false);
httpConn.setDoOutput(true); // indicates POST method
httpConn.setDoInput(true);
httpConn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
httpConn.setRequestProperty("User-Agent", "CodeJava Agent");
httpConn.setRequestProperty("Test", "Bonjour");
outputStream = httpConn.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
true);
}
/**
* Adds a form field to the request
*
* @param name field name
* @param value field value
*/
public void addFormField(String name, String value) {
writer.append("--" + boundary).append(LINE_FEED);
writer.append("Content-Disposition: form-data; name=\"" + name + "\"")
.append(LINE_FEED);
writer.append("Content-Type: text/plain; charset=" + charset).append(
LINE_FEED);
writer.append(LINE_FEED);
writer.append(value).append(LINE_FEED);
writer.flush();
}
/**
* Adds a upload file section to the request
*
* @param fieldName name attribute in <input type="file" name="..." />
* @param uploadFile a File to be uploaded
* @throws IOException
*/
public void addFilePart(String fieldName, File uploadFile)
throws IOException {
String fileName = uploadFile.getName();
writer.append("--" + boundary).append(LINE_FEED);
writer.append(
"Content-Disposition: form-data; name=\"" + fieldName
+ "\"; filename=\"" + fileName + "\"")
.append(LINE_FEED);
writer.append(
"Content-Type: "
+ URLConnection.guessContentTypeFromName(fileName))
.append(LINE_FEED);
writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
writer.append(LINE_FEED);
writer.flush();
FileInputStream inputStream = new FileInputStream(uploadFile);
byte[] buffer = new byte[4096];
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.flush();
inputStream.close();
writer.append(LINE_FEED);
writer.flush();
}
/**
* Adds a header field to the request.
*
* @param name - name of the header field
* @param value - value of the header field
*/
public void addHeaderField(String name, String value) {
writer.append(name + ": " + value).append(LINE_FEED);
writer.flush();
}
/**
* Completes the request and receives response from the server.
*
* @return a list of Strings as response in case the server returned
* status OK, otherwise an exception is thrown.
* @throws IOException
*/
public String finish() throws IOException {
StringBuffer response = new StringBuffer();
writer.append(LINE_FEED).flush();
writer.append("--" + boundary + "--").append(LINE_FEED);
writer.close();
// checks server's status code first
int status = httpConn.getResponseCode();
if (status == HttpURLConnection.HTTP_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(
httpConn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
httpConn.disconnect();
} else {
throw new IOException("Server returned non-OK status: " + status);
}
return response.toString();
}}uploadfile
注意：將下面的代碼放在非UI線程中以獲得響應(yīng)。
String charset = "UTF-8";String requestURL = "YOUR_URL";MultipartUtility multipart = new MultipartUtility(requestURL, charset);
multipart.addFormField("param_name_1", "param_value");multipart.addFormField("param_name_2", "param_value");
multipart.addFormField("param_name_3", "param_value");multipart.addFilePart("file_param_1", new File(file_path));
String response = multipart.finish(); // response from server.添加回答
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