android-async-http 和 xutils 上传图片问题

Question

 private void sendPost() throws Exception{
  String url = " http://192.168.1.17:8080/PushDemo/a.action";
  AsyncHttpClient ahc = new AsyncHttpClient();
  RequestParams rp = new RequestParams();
  rp.put("latitude", 100);
  rp.put("imgFile", new File("/sdcard/a.jpg"));
  
  
  ahc.post(url, rp, new AsyncHttpResponseHandler() {
   
   @Override
   public void onSuccess(int arg0, Header[] arg1, byte[] arg2) {
    Toast.makeText(MainActivity.this, "成功", 1).show();
   }
   
   @Override
   public void onFailure(int arg0, Header[] arg1, byte[] arg2, Throwable arg3) {
    Toast.makeText(MainActivity.this, arg3.getMessage(), 1).show();
   }
  });
  
 }

 

 

不知道为什么服务器端获取一直为null

Answer 1

看服务器代码

如果onSuccess进了回调 但是服务器没有文件就得自己拼表头，不知道AsyncHttpClient怎么拼，下面的例子是HttpURLConnection的。

public static String post(String actionUrl, Map<String, String> params, Map<String, File> files) throws IOException {

String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--", LINEND = "rn";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
URL uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
conn.setReadTimeout(5 * 1000);
conn.setDoInput(true);// 允许输入
conn.setDoOutput(true);// 允许输出
conn.setUseCaches(false);
conn.setRequestMethod("POST"); // Post方式
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

// 首先组拼文本类型的参数
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name="" + entry.getKey() + """ + LINEND);
sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);
}

DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(sb.toString().getBytes());

// 发送文件数据
if (files != null)
for (Map.Entry<String, File> file : files.entrySet()) {
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
sb1.append("Content-Disposition: form-data; name="file"; filename="" + file.getKey() + """ + LINEND);
sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);
sb1.append(LINEND);
outStream.write(sb1.toString().getBytes());
InputStream is = new FileInputStream(file.getValue());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}

is.close();
outStream.write(LINEND.getBytes());
}

// 请求结束标志
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
outStream.write(end_data);
outStream.flush();

// 得到响应码
int res = conn.getResponseCode();
InputStream in = conn.getInputStream();
InputStreamReader isReader = new InputStreamReader(in);
BufferedReader bufReader = new BufferedReader(isReader);
String line = null;
String data = "OK";

while ((line = bufReader.readLine()) == null)
data += line;

if (res == 200) {
int ch;
StringBuilder sb2 = new StringBuilder();
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
}
outStream.close();
conn.disconnect();
return in.toString();
}