Java sends an HTTP request and obtains a simple instance of the status Code _java

There is a requirement in the current project to send a URL request through Java to see if the URL is valid, so we can judge it by getting the status code.

try {URL u = new URL ("http://10.1.2.8:8080/fqz/page/qizha/pros_add.jsp");
				try {httpurlconnection uconnection = (httpurlconnection) u.openconnection ();
					try {uconnection.connect ();
					System.out.println (Uconnection.getresponsecode ());
					Connect = true;
					InputStream is = Uconnection.getinputstream ();
					BufferedReader br = new BufferedReader (new InputStreamReader (IS));
					StringBuilder sb = new StringBuilder ();
					while (Br.read ()!=-1) {Sb.append (Br.readline ());
					String content = new string (SB);
					Content = new String (content.getbytes ("GBK"), "iso-8859-1");
					SYSTEM.OUT.PRINTLN (content);
				Br.close ();
					catch (Exception e) {connect = false;
					E.printstacktrace ();
				System.out.println ("Connect failed");
				The catch (IOException e) {System.out.println ("build failed");
			E.printstacktrace ();
			The catch (Malformedurlexception e) {System.out.println ("Build URL failed"); E.printstackTrace (); }

The status code can be obtained by Uconnection.getresponsecode (). And then determine if the site exists. Here's what the different status codes mean.

HTTP status Return code 1XX (temporary response)

A status code that represents a temporary response and requires the requester to continue to perform the operation.

HTTP status Return code code description

100 (continued) The requester should continue to make the request. The server returns this code indicating that the first part of the request has been received and is waiting for the remainder.
101 (switching protocol) The requestor has asked the server to switch protocols, and the server has confirmed and is ready to switch.

HTTP status Return code 2xx (successful)

Represents the status code that successfully processed the request.

HTTP status Return code code description

200 (successful) the server has successfully processed the request. Typically, this indicates that the server has provided the requested Web page.

201 (created) The request was successful and the server created a new resource.

202 (accepted) the server has accepted the request but has not yet processed it.

203 (non-authoritative information) the server has successfully processed the request, but the returned information may be from another source.

204 (no content) the server successfully processed the request but did not return any content.

205 (reset content) the server successfully processed the request but did not return any content.

206 (partial content) the server successfully processed a partial GET request.

HTTP status return code 3xx (redirect)

Indicates that to complete the request, further action is required. Typically, these status codes are used for redirection.

HTTP status Return code code description

300 (multiple choices) for a request, the server can perform a variety of operations. The server can select an action based on the requester (user agent) or provide an action list for the requester to choose from.

301 (permanently moved) The requested page has been permanently moved to the new location. When the server returns this response (a response to a GET or head request), the requestor is automatically transferred to the new location.

302 (Temporary mobile) The server is currently responding to requests from Web pages in different locations, but the requester should continue to use the original location for subsequent requests.

303 (View other locations) The server returns this code when the requester should use a separate GET request to retrieve the response for a different location.

304 (not modified) The requested page has not been modified since the last request. When the server returns this response, the content of the Web page is not returned.

305 (using a proxy) the requester can only use the proxy to access the requested Web page. If the server returns this response, it also indicates that the requester should use the proxy.

307 (temporary redirection) The server is currently responding to requests from Web pages in different locations, but the requester should continue to use the original location for subsequent requests.

HTTP status Return code 4xx (request error)

These status codes indicate a possible error in the request and hinder the processing of the server.

HTTP status Return code code description

400 (Error request) The server does not understand the syntax of the request.

401 (not authorized) request authentication. The server may return this response for Web pages that need to log on.

403 (Prohibited) the server refused the request.

404 (Not found) the server could not find the requested Web page.

405 (method Disabled) Disables the method specified in the request.

406 (not accepted) cannot use the requested content attribute to respond to the requested Web page.

407 (proxy authorization required) This status code is similar to 401 (not authorized), but the specified requester should authorize the use of the agent.

408 (Request timed out) timeout occurs when the server waits for a request.

409 (conflicting) the server encountered a conflict while completing the request. The server must contain information about the conflict in the response.

410 (Deleted) If the requested resource has been permanently deleted, the server returns this response.

411 (requires a valid length) the server does not accept requests that do not contain a valid content Length header field.

412 (Prerequisites not met) the server did not meet one of the prerequisites that the requester set in the request.

413 (Request entity too Large) the server was unable to process the request because the request entity was too large to handle the server.

414 (The requested URI is too long) The requested URI (usually the URL) is too long for the server to process.

415 (Unsupported media type) The requested format is not supported by the requested page.

416 (Request range does not meet the requirements) if the page cannot provide the requested scope, the server returns this status code.

417 (expectations not met) the server did not meet the requirements for the "expected" Request header field.

HTTP status Return code 5xx (server error)

These status codes indicate that the server encountered an internal error while trying to process the request. These errors may be errors on the server itself, not the request.

HTTP status Return code code description

500 (server internal error) the server encountered an error and could not complete the request.

501 (not yet implemented) the server does not have the capability to complete the request. For example, this code may be returned when the server does not recognize the request method.

502 (Error Gateway) The server received an invalid response from the upstream server as a gateway or proxy.

503 (Service Unavailable) the server is not currently available (due to overloading or downtime maintenance). Usually, this is only a temporary state.

504 (Gateway Timeout) The server acts as a gateway or proxy, but does not receive requests from upstream servers in a timely manner.

505 (HTTP version is not supported) the server does not support the HTTP protocol version used in the request.

Some common HTTP status return codes are:

200-The server successfully returned to the Web page
404-The requested Web page does not exist
503-Service Not available

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