java.io.IOException：HTTP 响应代码：URL 为 400
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java.io.IOException: HTTP response code: 400 for URL
提问by user1443749
Here is my sample code :
这是我的示例代码：
String code = request.getParameter("authcode1");
String clientSecret = "xxxxxxxxxxxxx";
String newUrl = "https://accounts.google.com/o/oauth2/token";
String clientId = "xxxxxxxxxxxxxxx";
String callback = "http://localhost:8080/web/guest/home";
String tokenUrl = new String("https://accounts.google.com/o/oauth2/token");
StringBuffer params = new StringBuffer("");
params.append("code=" + URLEncoder.encode(code));
params.append("&client_id=" + clientId);
params.append("&client_secret=" + clientSecret);
params.append("&redirect_uri=" + callback);
params.append("&grant_type=authorization_code");
try
{
// Send data
URL url = new URL(tokenUrl.toString());
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
conn.setRequestProperty("Content-Length", "0");
conn.connect();
InputStream is;
if (conn.getResponseCode() != 200) {
is = conn.getInputStream();
} else {
is = conn.getErrorStream();
}
//URLConnection conn = url.openConnection();
//conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(params.toString());
wr.flush();
// Get the response
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = rd.readLine()) != null)
{
System.out.println("-----" + line);
}
wr.close();
rd.close();
}
catch (Exception e)
{
e.printStackTrace();
}
I am getting following exception in Tomcat:
我在 Tomcat 中遇到以下异常：
java.io.IOException: Server returned HTTP response code: 400 for URL: https://accounts.google.com/o/oauth2/token
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at sun.net.www.protocol.http.HttpURLConnection.run(HttpURLConnection.java:1368)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1362)
Please help me what am I doing wrong here? why I am getting java.io.IOException: HTTP response code: 400 for URL exception?
请帮助我我在这里做错了什么？为什么我收到 java.io.IOException: HTTP response code: 400 for URL exception？
回答by Buhake Sindi
First of all, this is incorrect:
首先，这是不正确的：
if (conn.getResponseCode() != 200) {
is = conn.getInputStream();
} else {
is = conn.getErrorStream();
}
It should be
它应该是
if (conn.getResponseCode() == 200) {
is = conn.getInputStream();
} else {
is = conn.getErrorStream();
}
Your issue is on this line:
您的问题在这一行：
conn.setRequestProperty("Content-Length", "0");
You can't send a Content-Lengthof 0when you have entity body appended in HTTP message.
你不能送Content-Length的0，当你有实体主体的HTTP消息追加。
Rather, set it as
而是将其设置为
conn.setRequestProperty("Content-Length", params.toString().length());
