Question

Web服务器怎么接收Android发送过来的文件信息

Answer 1

直接用 http handler 或者 http webapi 处理 multipart-data 请求

java:

File file = new File("F:\\tmp\\taiping\\conf-1.json");
MultipartEntity mpEntity = new MultipartEntity(); // 文件传输
ContentBody cbFile = new FileBody(file);
mpEntity.addPart("fileContent", cbFile);

CloseableHttpClient client = HttpClients.createDefault();
HttpPost post = new HttpPost("http://localhost:9999/api/values");
post.setEntity(mpEntity);
try {

CloseableHttpResponse response = client.execute(post);

String result = IOUtils.toString(response.getEntity().getContent());

System.out.println(result);
} catch (Exception e) {

e.printStackTrace();
}

.net http webapi

public HttpResponseMessage Post()
{
var content = Request.Content;
var uploadDir = HttpContext.Current.Server.MapPath("~/Upload");
var newFileName = "";

var sp = new MultipartMemoryStreamProvider();
Task.Run(async () => await Request.Content.ReadAsMultipartAsync(sp)).Wait();

foreach (var item in sp.Contents)
{
if (item.Headers.ContentDisposition.FileName != null)
{
var filename = item.Headers.ContentDisposition.FileName.Replace("\"", "");
newFileName = uploadDir + "\\" + filename;
var ms = item.ReadAsStreamAsync().Result;
using (var br = new BinaryReader(ms))
{
var data = br.ReadBytes((int)ms.Length);
File.WriteAllBytes(newFileName, data);
}
}
}

var result = new Dictionary<string, string>();
result.Add("result", newFileName);
var resp = Request.CreateResponse(HttpStatusCode.OK, result);
resp.Content.Headers.ContentType = new MediaTypeHeaderValue("text/plain");
return resp;
}

Answer 2

使用post方法上传数据：
在服务器实现的码代如下：
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name=request.getParameter("name");
String age=request.getParameter("age");
System.out.println("name form post method "+name);
System.out.println("age from post method"+age);
}
在客户端实现的码代如下：
public class postService {
public static boolean save(String name, String age) throws Exception {
String path="http://10.254.1.62/WebForPOSTMethod/POSTMethodServlet";
Map<String, String> params=new HashMap<String, String>();
params.put("name", name);
params.put("age", age);
return SendPOSTRequest(path,params,"UTF-8");
}
private static boolean SendPOSTRequest(String path,
Map<String, String> params, String encoding) throws Exception {
StringBuilder sb=new StringBuilder();
if (params!=null&&!params.isEmpty()) {
for (Map.Entry<String, String> entry:params.entrySet()) {
sb.append(entry.getKey()).append("=");
sb.append(URLEncoder.encode(entry.getValue(),encoding));
sb.append("&");
}
sb.deleteCharAt(sb.length()-1);
}
byte[] data=sb.toString().getBytes();
HttpURLConnection connection=(HttpURLConnection) new URL(path).openConnection();
connection.setConnectTimeout(5000);
//答应对外接连数据
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
connection.setRequestProperty("Content-Length", data.length+"");
OutputStream outputStream =connection.getOutputStream();
outputStream.write(data);
outputStream.flush();
if (connection.getResponseCode()==200) {
return true;
}
return false;
}
}
然后随便在Android上写个界面：
public class POSTDateToWebActivity extends Activity {

EditText getname,getage;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.post);
getname=(EditText) findViewById(R.id.name);
getage=(EditText) findViewById(R.id.age);
}
public void save(View v){
boolean result=false;
String name=getname.getText().toString();
String age=getage.getText().toString();
try {
result=postService.save(name,age);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (result) {
Toast.makeText(this, "success",1).show();
}else {
Toast.makeText(this, "error",1).show();
}
}
}