blocks|key|640342|text|HttpURLConnection|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|640343|URL+url+=+new+URL("http://example.com");
HttpURLConnection+connection+=+(HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.connect();

int+code+=+connection.getResponseCode();|code-block|syntax|javascript|640344|这绝对不是一个健壮的例子；您需要处理IOException之类的东西。但这应该能让你开始。|style|CODE|640345|如果您需要更多功能，请查看HttpClient。|640346|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/9/docs/api/java/net/HttpURLConnection.html#getResponseCode%2528%2529|1|https://hc.apache.org/httpcomponents-client-ga/^0|0|H|0|0|0|I|B|0|D|A|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@$A|14|B|15|K|L]]|9|@]|C|$]]|$1|M|3|N|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|O|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]]]

<a href="http://download.oracle.com/javase/9/docs/api/java/net/HttpURLConnection.html#getResponseCode%28%29" rel="noreferrer">HttpURLConnection</a>:

<pre><code>URL url = new URL("http://example.com");
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.connect();

int code = connection.getResponseCode();
</code></pre>

This is by no means a robust example; you'll need to handle <code>IOException</code>s and whatnot. But it should get you started.

If you need something with more capability, check out <a href="https://hc.apache.org/httpcomponents-client-ga/" rel="noreferrer">HttpClient</a>.

blocks|key|857755|text|URL+url+=+new+URL("http://www.google.com/humans.txt");
HttpURLConnection+http+=+(HttpURLConnection)url.openConnection();
int+statusCode+=+http.getResponseCode();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|857756|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>URL url = new URL("http://www.google.com/humans.txt");
HttpURLConnection http = (HttpURLConnection)url.openConnection();
int statusCode = http.getResponseCode();
</code></pre>

blocks|key|640387|text|您可以尝试执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640388|class+ResponseCodeCheck+
{

++++public+static+void+main+(String+args[])+throws+Exception
++++{

++++++++URL+url+=+new+URL("http://google.com");
++++++++HttpURLConnection+connection+=+(HttpURLConnection)url.openConnection();
++++++++connection.setRequestMethod("GET");
++++++++connection.connect();

++++++++int+code+=+connection.getResponseCode();
++++++++System.out.println("Response+code+of+the+object+is+"%2Bcode);
++++++++if+(code==200)
++++++++{
++++++++++++System.out.println("OK");
++++++++}
++++}
}|code-block|syntax|javascript|640389|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could try the following: 

<pre><code>class ResponseCodeCheck 
{

 public static void main (String args[]) throws Exception
 {

 URL url = new URL("http://google.com");
 HttpURLConnection connection = (HttpURLConnection)url.openConnection();
 connection.setRequestMethod("GET");
 connection.connect();

 int code = connection.getResponseCode();
 System.out.println("Response code of the object is "+code);
 if (code==200)
 {
 System.out.println("OK");
 }
 }
}
</code></pre>

blocks|key|857802|text|import+java.io.IOException;
import+java.net.URL;
import+java.net.HttpURLConnection;

public+class+API{
++++public+static+void+main(String+args[])+throws+IOException
++++{
++++++++URL+url+=+new+URL("http://www.google.com");
++++++++HttpURLConnection+http+=+(HttpURLConnection)url.openConnection();
++++++++int+statusCode+=+http.getResponseCode();
++++++++System.out.println(statusCode);
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|857803|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>import java.io.IOException;
import java.net.URL;
import java.net.HttpURLConnection;

public class API{
 public static void main(String args[]) throws IOException
 {
 URL url = new URL("http://www.google.com");
 HttpURLConnection http = (HttpURLConnection)url.openConnection();
 int statusCode = http.getResponseCode();
 System.out.println(statusCode);
 }
}
</code></pre>

blocks|key|640414|text|HttpURLConnection+connection+=+(HttpURLConnection)+url.openConnection();
++++++++++++connection.setDoOutput(true);
++++++++++++connection.setDoInput(true);
++++++++++++connection.setRequestMethod("POST");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|640415|。。。。。。。|unstyled|640416|System.out.println("Value"+%2B+connection.getResponseCode());
+++++++++++++System.out.println(connection.getResponseMessage());
+++++++++++++System.out.println("content"%2Bconnection.getContent());|640417|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 connection.setDoOutput(true);
 connection.setDoInput(true);
 connection.setRequestMethod("POST");
</code></pre>

.
.
.
.
.
.
.

<pre><code>System.out.println("Value" + connection.getResponseCode());
 System.out.println(connection.getResponseMessage());
 System.out.println("content"+connection.getContent());
</code></pre>

blocks|key|857845|text|这是对我有效的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|857846|import+java.io.IOException;
import+java.net.HttpURLConnection;
import+java.net.URL;

public+class+UrlHelpers+{

++++public+static+int+getHTTPResponseStatusCode(String+u)+throws+IOException+{

++++++++URL+url+=+new+URL(u);
++++++++HttpURLConnection+http+=+(HttpURLConnection)url.openConnection();
++++++++return+http.getResponseCode();
++++}
}|code-block|syntax|javascript|857847|希望这对某些人有帮助:)|857848|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is what worked for me:

<pre><code>import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class UrlHelpers {

 public static int getHTTPResponseStatusCode(String u) throws IOException {

 URL url = new URL(u);
 HttpURLConnection http = (HttpURLConnection)url.openConnection();
 return http.getResponseCode();
 }
}
</code></pre>

Hope this helps someone :)

blocks|key|857876|text|这对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|857877|++++++++++++import+org.apache.http.client.HttpClient;
++++++++++++import+org.apache.http.client.methods.HttpGet;++
++++++++++++import+org.apache.http.impl.client.DefaultHttpClient;
++++++++++++import+org.apache.http.HttpResponse;
++++++++++++import+java.io.BufferedReader;
++++++++++++import+java.io.InputStreamReader;



++++++++++++public+static+void+main(String[]+args)+throws+Exception+{+++
++++++++++++++++++++++++HttpClient+client+=+new+DefaultHttpClient();
++++++++++++++++++++++++//args[0]+="http://hostname:port/xyz/zbc";
++++++++++++++++++++++++HttpGet+request1+=+new+HttpGet(args[0]);
++++++++++++++++++++++++HttpResponse+response1+=+client.execute(request1);
++++++++++++++++++++++++int+code+=+response1.getStatusLine().getStatusCode();

+++++++++++++++++++++++++try(BufferedReader+br+=+new+BufferedReader(new+InputStreamReader((response1.getEntity().getContent())));){
++++++++++++++++++++++++++++//+Read+in+all+of+the+post+results+into+a+String.
++++++++++++++++++++++++++++String+output+=+"";
++++++++++++++++++++++++++++Boolean+keepGoing+=+true;
++++++++++++++++++++++++++++while+(keepGoing)+{
++++++++++++++++++++++++++++++++String+currentLine+=+br.readLine();++++++++++
++++++++++++++++++++++++++++++++if+(currentLine+==+null)+{
++++++++++++++++++++++++++++++++++++keepGoing+=+false;
++++++++++++++++++++++++++++++++}+else+{
++++++++++++++++++++++++++++++++++++output+%2B=+currentLine;
++++++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++System.out.println("Response-->"%2Boutput);+++
+++++++++++++++++++++++++}

+++++++++++++++++++++++++catch(Exception+e){
++++++++++++++++++++++++++++++System.out.println("Exception"%2Be);++

++++++++++++++++++++++++++}


+++++++++++++++++++}|code-block|syntax|javascript|857878|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This has worked for me :

<pre><code> import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet; 
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.HttpResponse;
 import java.io.BufferedReader;
 import java.io.InputStreamReader;



 public static void main(String[] args) throws Exception { 
 HttpClient client = new DefaultHttpClient();
 //args[0] ="http://hostname:port/xyz/zbc";
 HttpGet request1 = new HttpGet(args[0]);
 HttpResponse response1 = client.execute(request1);
 int code = response1.getStatusLine().getStatusCode();

 try(BufferedReader br = new BufferedReader(new InputStreamReader((response1.getEntity().getContent())));){
 // Read in all of the post results into a String.
 String output = "";
 Boolean keepGoing = true;
 while (keepGoing) {
 String currentLine = br.readLine(); 
 if (currentLine == null) {
 keepGoing = false;
 } else {
 output += currentLine;
 }
 }
 System.out.println("Response--&gt;"+output); 
 }

 catch(Exception e){
 System.out.println("Exception"+e); 

 }


 }
</code></pre>

blocks|key|857920|text|您可以使用java+http/https+url连接从网站获取响应码和其他信息，以下是示例代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|857921|+try+{

++++++++++++url+=+new+URL("https://www.google.com");+//+create+url+object+for+the+given+string++
++++++++++++HttpURLConnection+connection+=+(HttpURLConnection)+url.openConnection();
++++++++++++if(https_url.startsWith("https")){
+++++++++++++++++connection+=+(HttpsURLConnection)+url.openConnection();
++++++++++++}

++++++++++++((HttpURLConnection)+connection).setRequestMethod("HEAD");
++++++++++++connection.setConnectTimeout(50000);+//set+the+timeout
++++++++++++connection.connect();+//connect
++++++++++++String+responseMessage+=+connection.getResponseMessage();+//here+you+get+the+response+message
+++++++++++++responseCode+=+connection.getResponseCode();+//this+is+http+response+code
++++++++++++System.out.println(obj.getUrl()%2B"+is+up.+Response+Code+:+"+%2B+responseMessage);
++++++++++++connection.disconnect();`
}catch(Exception+e){
e.printStackTrace();
}|code-block|syntax|javascript|857922|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you can use java http/https url connection to get the response code from the website and other information as well here is a sample code.

<pre><code> try {

 url = new URL("https://www.google.com"); // create url object for the given string 
 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 if(https_url.startsWith("https")){
 connection = (HttpsURLConnection) url.openConnection();
 }

 ((HttpURLConnection) connection).setRequestMethod("HEAD");
 connection.setConnectTimeout(50000); //set the timeout
 connection.connect(); //connect
 String responseMessage = connection.getResponseMessage(); //here you get the response message
 responseCode = connection.getResponseCode(); //this is http response code
 System.out.println(obj.getUrl()+" is up. Response Code : " + responseMessage);
 connection.disconnect();`
}catch(Exception e){
e.printStackTrace();
}
</code></pre>

blocks|key|640572|text|通过扫描仪获取数据(负载不均匀)的有效方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640573|public+static+String+getResponseFromHttpUrl(URL+url)+throws+IOException+{
++++HttpURLConnection+urlConnection+=+(HttpURLConnection)+url.openConnection();
++++try+{
++++++++InputStream+in+=+urlConnection.getInputStream();

++++++++Scanner+scanner+=+new+Scanner(in);
++++++++scanner.useDelimiter("\\A");++//+Put+entire+content+to+next+token+string,+Converts+utf8+to+16,+Handles+buffering+for+different+width+packets

++++++++boolean+hasInput+=+scanner.hasNext();
++++++++if+(hasInput)+{
++++++++++++return+scanner.next();
++++++++}+else+{
++++++++++++return+null;
++++++++}
++++}+finally+{
++++++++urlConnection.disconnect();
++++}
}|code-block|syntax|javascript|640574|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Efficient way to get data(With uneven payload) by scanner.

<pre><code>public static String getResponseFromHttpUrl(URL url) throws IOException {
 HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
 try {
 InputStream in = urlConnection.getInputStream();

 Scanner scanner = new Scanner(in);
 scanner.useDelimiter("\\A"); // Put entire content to next token string, Converts utf8 to 16, Handles buffering for different width packets

 boolean hasInput = scanner.hasNext();
 if (hasInput) {
 return scanner.next();
 } else {
 return null;
 }
 } finally {
 urlConnection.disconnect();
 }
}
</code></pre>

blocks|key|857983|text|试试这段检查400条错误消息的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|857984|huc+=+(HttpURLConnection)(new+URL(url).openConnection());

huc.setRequestMethod("HEAD");

huc.connect();

respCode+=+huc.getResponseCode();

if(respCode+>=+400)+{
++++System.out.println(url%2B"+is+a+broken+link");
}+else+{
++++System.out.println(url%2B"+is+a+valid+link");
}|code-block|syntax|javascript|857985|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this piece of code which is checking the 400 error messages

<pre><code>huc = (HttpURLConnection)(new URL(url).openConnection());

huc.setRequestMethod("HEAD");

huc.connect();

respCode = huc.getResponseCode();

if(respCode &gt;= 400) {
 System.out.println(url+" is a broken link");
} else {
 System.out.println(url+" is a valid link");
}
</code></pre>

blocks|key|640624|text|这是完整的静态方法，您可以调整它来设置IOException发生时的等待时间和错误码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|640625|++public+static+int+getResponseCode(String+address)+{
++++return+getResponseCode(address,+404);
++}

++public+static+int+getResponseCode(String+address,+int+defaultValue)+{
++++try+{
++++++//Logger.getLogger(WebOperations.class.getName()).info("Fetching+response+code+at+"+%2B+address);
++++++URL+url+=+new+URL(address);
++++++HttpURLConnection+connection+=+(HttpURLConnection)+url.openConnection();
++++++connection.setConnectTimeout(1000+*+5);+//wait+5+seconds+the+most
++++++connection.setReadTimeout(1000+*+5);
++++++connection.setRequestProperty("User-Agent",+"Your+Robot+Name");
++++++int+responseCode+=+connection.getResponseCode();
++++++connection.disconnect();
++++++return+responseCode;
++++}+catch+(IOException+ex)+{
++++++Logger.getLogger(WebOperations.class.getName()).log(Level.INFO,+"Exception+at+{0}+{1}",+new+Object[]{address,+ex.toString()});
++++++return+defaultValue;
++++}
++}|code-block|syntax|javascript|640626|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is the full static method, which you can adapt to set waiting time and error code when IOException happens:

<pre><code> public static int getResponseCode(String address) {
 return getResponseCode(address, 404);
 }

 public static int getResponseCode(String address, int defaultValue) {
 try {
 //Logger.getLogger(WebOperations.class.getName()).info("Fetching response code at " + address);
 URL url = new URL(address);
 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 connection.setConnectTimeout(1000 * 5); //wait 5 seconds the most
 connection.setReadTimeout(1000 * 5);
 connection.setRequestProperty("User-Agent", "Your Robot Name");
 int responseCode = connection.getResponseCode();
 connection.disconnect();
 return responseCode;
 } catch (IOException ex) {
 Logger.getLogger(WebOperations.class.getName()).log(Level.INFO, "Exception at {0} {1}", new Object[]{address, ex.toString()});
 return defaultValue;
 }
 }
</code></pre>

blocks|key|858045|text|这是一个老问题，但让我们用REST方式来展示(JAX-RS)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|858046|import+java.util.Arrays;
import+javax.ws.rs.*

(...)

Response+response+=+client
++++.target(+url+)
++++.request()
++++.get();

//+Looking+if+response+is+"200",+"201"+or+"202",+for+example:
if(+Arrays.asList(+Status.OK,+Status.CREATED,+Status.ACCEPTED+).contains(+response.getStatusInfo()+)+)+{
++++//+lets+something...
}

(...)|code-block|syntax|javascript|858047|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Its a old question, but lets to show in the REST way (JAX-RS):

<pre><code>import java.util.Arrays;
import javax.ws.rs.*

(...)

Response response = client
 .target( url )
 .request()
 .get();

// Looking if response is "200", "201" or "202", for example:
if( Arrays.asList( Status.OK, Status.CREATED, Status.ACCEPTED ).contains( response.getStatusInfo() ) ) {
 // lets something...
}

(...)
</code></pre>

Please tell me the steps or code to get the response code of a particular URL.

How to get HTTP response code for a URL in Java?

请告诉我获取特定URL响应码的步骤或代码。

问如何在Java中获取URL的HTTP响应代码？
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