大佬教程收集整理的这篇文章主要介绍了HttpURLConnection POST，conn.getOutputStream（）引发异常，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
根本无法访问该URL。URL错误或DNS服务器无法解析主机名。尝试使用众所周知的URL进行简单连接以排除一个和另一个，例如
inputStream response = new URL("http://stackoverflow.com").openStream();
// Consume response.
，您需要使用代理服务器进行http连接。您还需要在Java端进行配置。 在 尝试连接到URL 之前， 添加以下行。
System.setProperty("http.proxyHost", "proxy.example.com");
System.setProperty("http.proxyPort", "8080");
在运行时仅执行一次即可。
我想使用httpURLConnection进行POST。我以两种方式尝试这种方法，但是这样做总是让我兴奋不已：conn.getOutputStream();
我在这两种情况下得到的异常是：
功能1：
public void makePost(String title,String comment,File filE) {
try {
URL servlet = new URL("http://" + "www.server.com/daten/web/test/testupload.nsf/upload?CreateDocument");
httpURLConnection conn=(httpURLConnection)servlet.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
String boundary = "---------------------------7d226f700d0";
conn.setrequestProperty("Content-type","multipart/form-data; boundary=" + boundary);
//conn.setrequestProperty("Referer","http://127.0.0.1/index.jsp");
conn.setrequestProperty("Cache-Control","no-cache");
OutputStream os = conn.getOutputStream(); //exception throws here!
DataOutputStream out = new DataOutputStream(os);
out.writeBytes("--" + boundary + "\r\n");
writeParam(INPUT_titlE,title,out,boundary);
writeParam(INPUT_COMMENT,comment,boundary);
writeFile(INPUT_FILE,file.getName(),boundary);
out.flush();
out.close();
InputStream stream = conn.geTinputStream();
BufferedInputStream in = new BufferedInputStream(stream);
int i = 0;
while ((i = in.read()) != -1) {
System.out.write(i);
}
in.close();
} catch (Exception E) {
e.printStackTrace();
}
}
或功能2：
public void makePost2(String title,File filE) {
File binaryFile = file;
String boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
URLConnection connection = null;
try {
connection = new URL("http://" + "www.server.com/daten/web/test/testupload.nsf/upload?CreateDocument").openConnection();
} catch (MalformedURLException E) {
e.printStackTrace();
} catch (IOException E) {
e.printStackTrace();
}
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setrequestProperty("Content-Type","multipart/form-data; boundary=" + boundary);
PrintWriter writer = null;
try {
OutputStream output = connection.getOutputStream(); //exception throws here
writer = new PrintWriter(new OutputStreamWriter(output,CHARSET),truE); // true = autoFlush,important!
// Send normal param.
writer.println("--" + boundary);
writer.println("Content-Disposition: form-data; name=\""+ INPUT_titlE +"\"");
writer.println("Content-Type: text/plain; charset=" + CHARSET);
writer.println();
writer.println(titlE);
// Send binary file.
writer.println("--" + boundary);
writer.println("Content-Disposition: form-data; name=\""+ INPUT_FILE +"\"; filename=\"" + binaryFile.getName() + "\"");
writer.println("Content-Type: " + URLConnection.guessContentTypeFromname(binaryFile.getName()));
writer.println("Content-Transfer-Encoding: binary");
writer.println();
InputStream input = null;
try {
input = new FileInputStream(binaryFilE);
byte[] buffer = new byte[1024];
for (int length = 0; (length = input.read(buffer)) > 0;) {
output.write(buffer,length);
}
output.flush(); // Important! Output cAnnot be closed. Close of writer will close output as well.
} catch (IOException E) {
e.printStackTrace();
} finally {
if (input != null) try { input.close(); } catch (IOException logOrIgnorE) {}
}
writer.println(); // Important! InDicates end of binary boundary.
// End of multipart/form-data.
writer.println("--" + boundary + "--");
} catch (IOException E) {
e.printStackTrace();
} finally {
if (writer != null) writer.close();
}
}
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