com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl不能转换为javax.net.ssl.HttpsURLConnection
com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl不能转换为javax.net.ssl.HttpsURLConnection
提问于 2014-05-07 11:55:22
我在我的Netbeans 7.4中尝试了这段代码，它没有问题。
import java.io.IOException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public class JavaApplication148 {
public static void main(String[] args) throws IOException {
URL url = new URL("https://redmine.ackee.cz/time_entries.xml");
HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection();
}
}但是，我在maven驱动的项目中使用了它，它引发了以下异常：
java.lang.ClassCastException: com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl
cannot be cast to javax.net.ssl.HttpsURLConnection下面是maven项目中引发错误的类
package cz.ackee.redmine.commands;
import java.io.IOException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public abstract class RedmineCommand {
public void write(String xmlAddress, String text, String requestMethod) throws IOException{
URL url = new URL("https://redmine.xxx.cz/time_entries.xml");
HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection(); //this line throws exception
}
}这是我的pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cz.ackee</groupId>
<artifactId>pan-unicorn-bot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Pan Unicorn Bot</name>
<description>Pan unicorn IRC Bot</description>
<repositories>
<repository>
<id>apache-snapshots</id>
<url>http://repository.apache.org/snapshots/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.5.Final</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-cli</artifactId>
<version>1.3-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.taskadapter</groupId>
<artifactId>redmine-java-api</artifactId>
<version>1.23</version>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<groupId>org.apache.maven.plugins</groupId>
<version>2.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.2.1</version>
<configuration>
<descriptors>
<descriptor>/src/main/assembly/binary.xml</descriptor>
</descriptors>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<archive>
<index>true</index>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>cz.ackee.unicorn.PanUnicornMain</mainClass>
</manifest>
<manifestEntries>
<mode>development</mode>
<url>${project.url}</url>
<key>value</key>
</manifestEntries>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>你知道，为什么它在netbeans上没有问题地编译和运行，为什么它在maven-eclipse项目上不顺利？
(我使用mvn package通过命令行进行编译，通过eclipse运行它)
回答 4
Stack Overflow用户
回答已采纳
发布于 2014-05-07 13:13:24
解决方案是更改这一行。
URL url = new URL("https://redmine.xxx.cz/time_entries.xml");进入这条线
URL url = new URL(null, "https://redmine.xxx.cz/time_entries.xml", new sun.net.www.protocol.https.Handler());Stack Overflow用户
发布于 2017-06-16 01:42:08
如果您使用的只是HTTP协议(而不是HTTPS)，而不是：
HttpsURLConnection httpCon = (HttpsURLConnection) url.openConnection()；
用这个：
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection()；
只需删除"HttpsURLConnection“中的"s”
Stack Overflow用户
发布于 2019-05-06 12:37:40
为了避免这种错误，您可以对http和https url使用HttpUrlConnection (java.net.HttpUrlConnection)。
HttpsUrlConnection只为https连接添加“可以使用”的额外方法，但您可能不会使用这些方法。
HttpsUrlConnection和HttpUrlConnection都来自UrlConnection，其中包含允许读取响应的方法，如getInputStream()。HttpsUrlConnection来源于HttpUrlConnection，而后者来自于UrlConnection。
java.net.HttpUrlConnection只是添加与http协议相关的方法(这些方法适用于https)
https://docs.oracle.com/javase/8/docs/api/java/net/HttpURLConnection.html https://docs.oracle.com/javase/8/docs/api/javax/net/ssl/HttpsURLConnection.html
因此，您可以这样做：
URL url = new URL(urlString);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));您也可以这样做并获得相同的结果，连接将是相同的：
URL url = new URL(urlString);
HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
con.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/23517139
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