需求:用HttpURLConnection模拟上传图片并把图片的名称也要传递过去.
简单分析:写入流的时候依次写入 图片名称 + "|" 分隔符 + 图片流
然后服务器接收的再处理流．分别取出图片名和图片.
/** *//**
* 上传方法
* 返回上传完毕的文件名
* *
*/
public String upload(File f)
{
try
{
//服务器IP(这里是从属性文件中读取出来的)
String hostip = FileSupport.getServerIP();
URL url = new URL("http://"+ hostip +"/oxServer/ReceiveServlet");
HttpURLConnection uc = (HttpURLConnection) url.openConnection();
//上传图片的一些参数设置
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);
//读取文件流
int size = (int) f.length();
byte[] data = new byte[size];
FileInputStream fis = new FileInputStream(f);
OutputStream out = uc.getOutputStream();
fis.read(data, 0, size);
//写入文件名
out.write(f.getName().trim().getBytes());
//写入分隔符
out.write('|');
//写入图片流
out.write(data);
out.flush();
out.close();
fis.close();
//读取响应数据
int code = uc.getResponseCode();
String sCurrentLine = "";
//存放响应结果
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 = "远程服务器连接失败,错误代码:" + code;
}
return sTotalString;
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
服务器Servlet:
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
ServletInputStream inStream = request.getInputStream(); // 取HTTP请求流
int size = request.getContentLength(); // 取HTTP请求流长度
byte[] buffer = new byte[size]; // 用于缓存每次读取的数据
byte[] result = new byte[size]; // 用于存放结果的数组
int count = 0;
int rbyte = 0;
// 循环读取
while (count < size)
{
rbyte = inStream.read(buffer); // 每次实际读取长度存于rbyte中 sflj
for (int i = 0; i < rbyte; i++)
{
result[count + i] = buffer[i];
}
count += rbyte;
}
// 先找到文件名和图片流的标志位'|'
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];
// 存放图片字节
byte[] img = new byte[size - index];
for (int i = 0; i < result.length; i++)
{
if (i < index)
{
name[i] = result[i];
}
if (i > index)
{
// 这时注意img数组的index要从0开始
img[i - index - 1] = result[i];
}
}
// 还原文件名
String fileName = new String(name);
inStream.close();
String newFileName = renameFile(fileName);
// 响应客户端
response.setContentType("text/html");
// 注意响应中文数据时要设置
response.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
//可能情况 0 数据库无相关记录 1 文件名不符合要求 其它情况为正常
if(newFileName.equals("0"))
{
out.write("0|" + fileName);
}
else if(newFileName.equals("1"))
{
out.write("1|" + fileName);
}
else
{
out.write(fileName);
}
out.close();
//上传错误中止后续操作
if(newFileName.length()<= 1)
{
return;
}
File f = new File(ImageSupport.getOriginal() + "/" + newFileName);
FileOutputStream fos = new FileOutputStream(f);
fos.write(img);
fos.flush();
fos.close();
// 改变图片大小后重新放置到新地点
ImageSupport.changeImageSize(f, ImageSupport.getAfter() + "/"
+ newFileName, 300, 300);
}
我写的是一个批量上传图片的程序，经测试通过.