Java HttpURLConnection getResponseCode

2025 年 3 月 22 日 | 阅读需 2 分钟

getResponseCode 是 Java HttpURLConnection 类的一个方法。此方法用于从 HTTP 响应消息中获取状态码。例如，如果状态行是 HTTP/1.0 200 OK

那么它将返回 200，或者如果状态行是 HTTP/1.0 401 unauthorized，那么它将返回 401。如果 HTTP 响应无效，此方法将返回 -1。

语法

返回值

它返回 HTTP 状态码或 -1

抛出

IOException - 如果连接服务器时发生错误，它会抛出此异常。

示例 1

import java.io.IOException; 
import java.net.HttpURLConnection; 
import java.net.URL; 
public class JavaHttpURLConnectiongetResponseCodeExample1 {
    //Starting the main method...
    public static void main(String h[]) throws IOException 
    { 
        //starting the try block
        try {
        String link_url = "https://mysqlserver.cn";
        int i;
        i=10;
        URL obj1 = new URL(link_url); //URL Connection Created...
        HttpURLConnection con1 = (HttpURLConnection) obj1.openConnection(); //Http URL Connection Created...
        int r_code =con1.getResponseCode(); // it is use to get the status code from HTTP response message
        System.out.println("https://mysqlserver.cn");
        System.out.println("Connection Response Code : "+r_code);
        if (r_code != HttpURLConnection.HTTP_OK) // HTTP_OK : HTTP Status-Code 200: OK.
        {
        System.out.println("Download failed" + r_code );
        System.exit(0);
        }
          con1.disconnect();
          System.out.println("Connection Disconnect... ");
        }
        catch (Exception e) {
            System.out.println( e);
        }
}
}

输出

https://mysqlserver.cn
Connection Response Code : 200
Connection Disconnect...

示例 2

import java.io.IOException; 
import java.net.HttpURLConnection; 
import java.net.URL; 
public class JavaHttpURLConnectiongetResponseCodeExample2 {
    //Starting the main method...
    public static void main(String h[]) throws IOException 
    { 
             String link_url = "https://#";
        String link_url1 = "https://tpointtech.cn";
        //starting the try block
        try {
        URL obj1 = new URL(link_url); //URL Connection Created...
        HttpURLConnection con1 = (HttpURLConnection) obj1.openConnection(); //Http URL 
         URL obj2 = new URL(link_url1); //URL Connection Created...
        HttpURLConnection con2 = (HttpURLConnection) obj2.openConnection(); //Http URL 
        int r_code1 =con2.getResponseCode();
        int r_code =con1.getResponseCode(); // it is use to get the status code from HTTP response message
        System.out.println("https://#");
        System.out.println("Connection Response Code : "+HttpURLConnection.HTTP_NOT_AUTHORITATIVE+" " +r_code);
        System.out.println("https://tpointtech.cn");
        System.out.println("Connection Response Code : "+HttpURLConnection.HTTP_SEE_OTHER+" " +r_code1);
            con1.disconnect();  
        con2.disconnect();
          System.out.println("Connection Disconnect... ");
        }
        catch (Exception e) {
            System.out.println( e);
        }}}

输出

https://#
Connection Response Code : 203 200
https://tpointtech.cn
Connection Response Code : 303 200
Connection Disconnect...

下一个主题Java HttpURLConnection 类

Java HttpURLConnection getResponseCode

语法

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示例 1

示例 2

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Java HttpURLConnection getResponseCode

语法

返回值

抛出

示例 1

示例 2

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