通过 http post 方式上传多张图片
客户端一：下面为 Android 客户端的实现代码：
/**
* android上传文件到服务器
*
* 下面为 http post 报文格式
*
POST/logsys/home/uploadIspeedLog!doDefault.html HTTP/1.1
Accept: text/plain,
Accept-Language: zh-cn
Host: 192.168.24.56
Content-Type:multipart/form-data;boundary=-----------------------------7db372eb000e2
User-Agent: WinHttpClient
Content-Length: 3693
Connection: Keep-Alive 注：上面为报文头
-------------------------------7db372eb000e2
Content-Disposition: form-data; name="file"; filename="kn.jpg"
Content-Type: image/jpeg
(此处省略jpeg文件二进制数据...）
-------------------------------7db372eb000e2--
*
* @param picPaths
* 需要上传的文件路径集合
* @param requestURL
* 请求的url
* @return 返回响应的内容
*/
public static String uploadFile(String[] picPaths, String requestURL) {
String boundary = UUID.randomUUID().toString(); // 边界标识 随机生成
String prefix = "--", end = "\r\n";
String content_type = "multipart/form-data"; // 内容类型
String CHARSET = "utf-8"; // 设置编码
int TIME_OUT = 10 * 10000000; // 超时时间
try {
URL url = new URL(requestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIME_OUT);
conn.setConnectTimeout(TIME_OUT);
conn.setDoInput(true); // 允许输入流
conn.setDoOutput(true); // 允许输出流
conn.setUseCaches(false); // 不允许使用缓存
conn.setRequestMethod("POST"); // 请求方式
conn.setRequestProperty("Charset", "utf-8"); // 设置编码
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Content-Type", content_type + ";boundary=" + boundary);
/**
* 当文件不为空，把文件包装并且上传
*/
OutputStream outputSteam = conn.getOutputStream();
DataOutputStream dos = new DataOutputStream(outputSteam);
StringBuffer stringBuffer = new StringBuffer();
stringBuffer.append(prefix);
stringBuffer.append(boundary);
stringBuffer.append(end);
dos.write(stringBuffer.toString().getBytes());
String name = "userName";
dos.writeBytes("Content-Disposition: form-data; name=\"" + name + "\"" + end);
dos.writeBytes(end);
dos.writeBytes("zhangSan");
dos.writeBytes(end);
for(int i = 0; i < picPaths.length; i++){
File file = new File(picPaths[i]);
StringBuffer sb = new StringBuffer();
sb.append(prefix);
sb.append(boundary);
sb.append(end);
/**
* 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的 比如:abc.png
*/
sb.append("Content-Disposition: form-data; name=\"" + i + "\"; filename=\"" + file.getName() + "\"" + end);
sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + end);
sb.append(end);
dos.write(sb.toString().getBytes());
InputStream is = new FileInputStream(file);
byte[] bytes = new byte[8192];//8k
int len = 0;
while ((len = is.read(bytes)) != -1) {
dos.write(bytes, 0, len);
}
is.close();
dos.write(end.getBytes());//一个文件结束标志
}
byte[] end_data = (prefix + boundary + prefix + end).getBytes();//结束 http 流
dos.write(end_data);
dos.flush();
/**
* 获取响应码 200=成功 当响应成功，获取响应的流
*/
int res = conn.getResponseCode();
Log.e("TAG", "response code:" + res);
if (res == 200) {
return SUCCESS;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return FAILURE;
}
服务端一：下面为 Java Web 服务端 servlet 的实现代码：
public class FileImageUploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private ServletFileUpload upload;
private final long MAXSize = 4194304 * 2L;// 4*2MB
private String filedir = null;
/**
* @see HttpServlet#HttpServlet()
*/
public FileImageUploadServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* 设置文件上传的初始化信息
*
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
FileItemFactory factory = new DiskFileItemFactory();// Create a factory
// for disk-based
// file items
this.upload = new ServletFileUpload(factory);// Create a new file upload
// handler
this.upload.setSizeMax(this.MAXSize);// Set overall request size
// constraint 4194304
filedir = config.getServletContext().getRealPath("images");
System.out.println("filedir=" + filedir);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
@SuppressWarnings("unchecked")
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
try {
// String userName = request.getParameter("userName");//获取form
// System.out.println(userName);
List<FileItem> items = this.upload.parseRequest(request);
if (items != null && !items.isEmpty()) {
for (FileItem fileItem : items) {
String filename = fileItem.getName();
if (filename == null) {// 说明获取到的可能为表单数据,为表单数据时要自己读取
InputStream formInputStream = fileItem.getInputStream();
BufferedReader formBr = new BufferedReader(new InputStreamReader(formInputStream));
StringBuffer sb = new StringBuffer();
String line = null;
while ((line = formBr.readLine()) != null) {
sb.append(line);
}
String userName = sb.toString();
System.out.println("姓名为：" + userName);
continue;
}
String filepath = filedir + File.separator + filename;
System.out.println("文件保存路径为:" + filepath);
File file = new File(filepath);
InputStream inputSteam = fileItem.getInputStream();
BufferedInputStream fis = new BufferedInputStream(inputSteam);
FileOutputStream fos = new FileOutputStream(file);
int f;
while ((f = fis.read()) != -1) {
fos.write(f);
}
fos.flush();
fos.close();
fis.close();
inputSteam.close();
System.out.println("文件：" + filename + "上传成功!");
}
}
System.out.println("上传文件成功!");
out.write("上传文件成功!");
} catch (FileUploadException e) {
e.printStackTrace();
out.write("上传文件失败:" + e.getMessage());
}
}
}
客户端二：下面为用 .NET 作为客户端实现的 C# 代码：
/** 下面为 http post 报文格式
POST/logsys/home/uploadIspeedLog!doDefault.html HTTP/1.1
Accept: text/plain,
Accept-Language: zh-cn
Host: 192.168.24.56
Content-Type:multipart/form-data;boundary=-----------------------------7db372eb000e2
User-Agent: WinHttpClient
Content-Length: 3693
Connection: Keep-Alive 注：上面为报文头
-------------------------------7db372eb000e2
Content-Disposition: form-data; name="file"; filename="kn.jpg"
Content-Type: image/jpeg
(此处省略jpeg文件二进制数据...）
-------------------------------7db372eb000e2--
*
* */
private STATUS uploadImages(String uri)
{
String boundary = "------------Ij5ei4ae0ei4cH2ae0Ef1ei4Ij5gL6";; // 边界标识
String prefix = "--", end = "\r\n";
/** 根据uri创建WebRequest对象**/
WebRequest httpReq = WebRequest.Create(new Uri(uri));
httpReq.Method = "POST";//方法名
httpReq.Timeout = 10 * 10000000;//超时时间
httpReq.ContentType = "multipart/form-data; boundary=" + boundary;//数据类型
/*******************************/
try {
/** 第一个数据为form，名称为par，值为123 */
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append(prefix);
stringBuilder.Append(boundary);
stringBuilder.Append(end);
String name = "userName";
stringBuilder.Append("Content-Disposition: form-data; name=\"" + name + "\"" + end);
stringBuilder.Append(end);
stringBuilder.Append("zhangSan");
stringBuilder.Append(end);
/*******************************/
Stream steam = httpReq.GetRequestStream();//获取到请求流
byte[] byte8 = Encoding.UTF8.GetBytes(stringBuilder.ToString());//把form的数据以二进制流的形式写入
steam.Write(byte8, 0, byte8.Length);
/** 列出 G:/images/ 文件夹下的所有文件**/
DirectoryInfo fileFolder = new DirectoryInfo("G:/images/");
FileSystemInfo[] files = fileFolder.GetFileSystemInfos();
for(int i = 0; i < files.Length; i++)
{
FileInfo file = files[i] as FileInfo;
stringBuilder.Clear();//清理
stringBuilder.Append(prefix);
stringBuilder.Append(boundary);
stringBuilder.Append(end);
/**
* 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的 比如:abc.png
*/
stringBuilder.Append("Content-Disposition: form-data; name=\"" + i + "\"; filename=\"" + file.Name + "\"" + end);
stringBuilder.Append("Content-Type: application/octet-stream; charset=utf-8" + end);
stringBuilder.Append(end);
byte[] byte2 = Encoding.UTF8.GetBytes(stringBuilder.ToString());
steam.Write(byte2, 0, byte2.Length);
FileStream fs = new FileStream(file.FullName, FileMode.Open, FileAccess.Read);//读入一个文件。
BinaryReader r = new BinaryReader(fs);//将读入的文件保存为二进制文件。
int bufferLength = 8192;//每次上传8k；
byte[] buffer = new byte[bufferLength];
long offset = 0;//已上传的字节数
int size = r.Read(buffer, 0, bufferLength);
while (size > 0)
{
steam.Write(buffer, 0, size);
offset += size;
size = r.Read(buffer, 0, bufferLength);
}
/** 每个文件结束后有换行 **/
byte[] byteFileEnd = Encoding.UTF8.GetBytes(end);
steam.Write(byteFileEnd, 0, byteFileEnd.Length);
fs.Close();
r.Close();
}
byte[] byte1 = Encoding.UTF8.GetBytes(prefix + boundary + prefix + end);//文件结束标志
steam.Write(byte1, 0, byte1.Length);
steam.Close();
WebResponse response = httpReq.GetResponse();// 获取响应
Console.WriteLine(((HttpWebResponse)response).StatusDescription);// 显示状态
steam = response.GetResponseStream();//获取从服务器返回的流
StreamReader reader = new StreamReader(steam);
string responseFromServer = reader.ReadToEnd();//读取内容
Console.WriteLine(responseFromServer);
// 清理流
reader.Close();
steam.Close();
response.Close();
return STATUS.SUCCESS;
} catch (System.Exception e) {
Console.WriteLine(e.ToString());
return STATUS.FAILURE;
}
}
服务端二： 下面为 .NET 实现的服务端 C# 代码：
protected void Page_Load(object sender, EventArgs e)
{
string userName = Request.Form["userName"];//接收form
HttpFileCollection MyFilecollection = Request.Files;//接收文件
for (int i = 0; i < MyFilecollection.Count; i++ )
{
MyFilecollection[i].SaveAs(Server.MapPath("~/netUploadImages/" + MyFilecollection[i].FileName));//保存图片
}
}