需求:用HttpURLConnection模擬上傳圖片并把圖片的名稱也要傳遞過去.
簡單分析:寫入流的時候依次寫入 圖片名稱 + "|" 分隔符 + 圖片流
然后服務器接收的再處理流．分別取出圖片名和圖片.
/** *//**
* 上傳方法
* 返回上傳完畢的文件名
* *
*/
public String upload(File f)
{
try
{
//服務器IP(這里是從屬性文件中讀取出來的)
String hostip = FileSupport.getServerIP();
URL url = new URL("http://"+ hostip +"/oxServer/ReceiveServlet");
HttpURLConnection uc = (HttpURLConnection) url.openConnection();
//上傳圖片的一些參數設置
uc
.setRequestProperty(
"Accept",
"image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, application/x-quickviewplus, */*");
uc.setRequestProperty("Accept-Language", "zh-cn");
uc
.setRequestProperty("Content-type",
"multipart/form-data; boundary=---------------------------7d318fd100112");
uc.setRequestProperty("Accept-Encoding", "gzip, deflate");
uc
.setRequestProperty("User-Agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
uc.setRequestProperty("Connection", "Keep-Alive");
uc.setDoOutput(true);
uc.setUseCaches(true);
//讀取文件流
int size = (int) f.length();
byte[] data = new byte[size];
FileInputStream fis = new FileInputStream(f);
OutputStream out = uc.getOutputStream();
fis.read(data, 0, size);
//寫入文件名
out.write(f.getName().trim().getBytes());
//寫入分隔符
out.write('|');
//寫入圖片流
out.write(data);
out.flush();
out.close();
fis.close();
//讀取響應數據
int code = uc.getResponseCode();
String sCurrentLine = "";
//存放響應結果
String sTotalString = "";
if (code == 200)
{
java.io.InputStream is = uc.getInputStream();
BufferedReader reader = new BufferedReader(
new InputStreamReader(is));
while ((sCurrentLine = reader.readLine()) != null)
if (sCurrentLine.length() > 0)
sTotalString = sTotalString + sCurrentLine.trim();
}
else
{
sTotalString = "遠程服務器連接失敗,錯誤代碼:" + code;
}
return sTotalString;
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
服務器Servlet:
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
ServletInputStream inStream = request.getInputStream(); // 取HTTP請求流
int size = request.getContentLength(); // 取HTTP請求流長度
byte[] buffer = new byte[size]; // 用于緩存每次讀取的數據
byte[] result = new byte[size]; // 用于存放結果的數組
int count = 0;
int rbyte = 0;
// 循環讀取
while (count < size)
{
rbyte = inStream.read(buffer); // 每次實際讀取長度存于rbyte中 sflj
for (int i = 0; i < rbyte; i++)
{
result[count + i] = buffer[i];
}
count += rbyte;
}
// 先找到文件名和圖片流的標志位'|'
int index = 0;
for (int i = 0; i < result.length; i++)
{
byte b = result[i];
if (b == '|')
{
index = i;
break;
}
}
// 存放文件名
byte name[] = new byte[index + 1];
// 存放圖片字節
byte[] img = new byte[size - index];
for (int i = 0; i < result.length; i++)
{
if (i < index)
{
name[i] = result[i];
}
if (i > index)
{
// 這時注意img數組的index要從0開始
img[i - index - 1] = result[i];
}
}
// 還原文件名
String fileName = new String(name);
inStream.close();
String newFileName = renameFile(fileName);
// 響應客戶端
response.setContentType("text/html");
// 注意響應中文數據時要設置
response.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
//可能情況 0 數據庫無相關記錄 1 文件名不符合要求 其它情況為正常
if(newFileName.equals("0"))
{
out.write("0|" + fileName);
}
else if(newFileName.equals("1"))
{
out.write("1|" + fileName);
}
else
{
out.write(fileName);
}
out.close();
//上傳錯誤中止后續操作
if(newFileName.length()<= 1)
{
return;
}
File f = new File(ImageSupport.getOriginal() + "/" + newFileName);
FileOutputStream fos = new FileOutputStream(f);
fos.write(img);
fos.flush();
fos.close();
// 改變圖片大小后重新放置到新地點
ImageSupport.changeImageSize(f, ImageSupport.getAfter() + "/"
+ newFileName, 300, 300);
}
我寫的是一個批量上傳圖片的程序，經測試通過.