Java HttpURLConnection getErrorStream() 方法

2025 年 3 月 22 日 | 阅读需 2 分钟

getErrorStream() 是 HttpURLConnection 类的一个方法。如果连接中断，该方法用于获取错误流。此方法不会建立连接。如果连接未建立或服务器在建立连接过程中未引发任何错误，则此方法将返回 null。Null 是此方法中的默认值。

语法

返回值

此方法返回错误流（如果存在），否则如果未发生错误，则返回默认值。

示例 1

import java.io.IOException; 
import java.io.InputStream;
import java.net.HttpURLConnection; 
import java.net.URL; 
public class JavaHttpURLConnectionGetErrorStreamMethodExample1 {
    //Starting the main method...
    public static void main(String h[]) throws IOException 
	{ 
        //starting the try block
        try 
        {
        String link_url ;
        link_url="https://tpointtech.cn";
        URL obj1 = new URL(link_url); //URL Connection Created...
        HttpURLConnection con1 = (HttpURLConnection) obj1.openConnection(); //Http URL Connection Created...
        con1.setConnectTimeout(1000);
        con1.connect();
        InputStream a;
        a = con1.getErrorStream();
        System.out.println("Error Stream : "+a);
        con1.disconnect();
        System.out.println("Connection disconnected");
        }
        catch (Exception e) 
        {
            System.out.println( e);
        }
    }
}

输出

Error Stream : null
Connection disconnected

示例 2

import java.io.IOException; 
import java.io.InputStream;
import java.net.HttpURLConnection; 
import java.net.URL; 
public class JavaHttpURLConnectionGetErrorStreamMethodExample2 {
    //Starting the main method...
    public static void main(String h[]) throws IOException 
	{ 
        //starting the try block
        try 
        {
        String link_url ;
        link_url="https://#";
        URL obj1 = new URL(link_url); //URL Connection Created...
        HttpURLConnection con1 = (HttpURLConnection) obj1.openConnection(); //Http URL Connection Created...
        con1.setConnectTimeout(1000);
        con1.connect();
System.out.println("Connection Established");
        InputStream a;
        a = con1.getErrorStream();
        System.out.println("Error Stream : "+a);
        System.out.println("Header field 1:" + con1.getHeaderField(1));
        con1.disconnect();
        System.out.println("Connection disconnected");
        }
        catch (Exception e) 
        {
            System.out.println( e);
        }
    }
}

输出

Connection Established
Error Stream : null
Header field 1:0
Connection disconnected

下一个主题Java HttpURLConnection 类

Java HttpURLConnection getErrorStream() 方法

语法

返回值

示例 1

示例 2

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Java HttpURLConnection getErrorStream() 方法

语法

返回值

示例 1

示例 2

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