通过java通过https下载文件

这是我从网上复制的一段代码

/**
 * A simple example that uses HttpClient to perform a GET using Basic
 * Authentication. Can be run standalone without parameters.
 *
 * You need to have JSSE on your classpath for JDK prior to 1.4
 *
 * @author Michael Becke
 */
public class BasicAuthenticationExample {

    /**
     * Constructor for BasicAuthenticatonExample.
     */
    public BasicAuthenticationExample() {
        super();
    }

    public static void main(String[] args) throws Exception {
        HttpClient client = new HttpClient();

       client.getState().setCredentials(
                new AuthScope("login.website.com", 443),
                new UsernamePasswordCredentials("login id", "password")
                );

        GetMethod get = new GetMethod(
                "https://url to the file");

        get.setDoAuthentication( true );

        try {
            // execute the GET
            int status = client.executeMethod( get );

            // print the status and response
            System.out.println(status + "\n" + 
                    get.getResponseBodyAsString());

        } finally {
            // release any connection resources used by the method
            get.releaseConnection();
        }
    }
}

现在因为排队

            int status = client.executeMethod( get );

我得到以下错误

Exception in thread "main" javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(Unknown Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write(Unknown Source)
at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
at java.io.BufferedOutputStream.flush(Unknown Source)
at org.apache.commons.httpclient.HttpConnection.flushRequestOutputStream(HttpConnection.java:828)
at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2116)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
at BasicAuthenticationExample.main(BasicAuthenticationExample.java:38)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
at sun.security.validator.Validator.validate(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
... 18 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
at java.security.cert.CertPathBuilder.build(Unknown Source)
... 24 more

现在出现此错误的原因当然是服务器发送的证书不在我的受信任证书列表中。 我的问题是如何将证书放入受信任列表

谢谢

---

Pranabesh

您可以使用导入。

此页面似乎回答了您的问题：

它引用了Andres Sterbenz的InstallCert&

---

如果只是为了测试，您可能不想在受信任的存储中实际添加证书。因此，您也可以。

您将需要一个包含要信任的证书的密钥库。您可以使用Java的命令来实现这一点。有几种方法可以做到这一点：

• 将其添加到默认Java密钥库（

  .keystore

  ，在Windows上的主目录或用户目录中）
• 将系统属性

  javax.net.ssl.trustStore

  设置为备用密钥库的位置（类似于

  java-Djavax.net.ssl.trustStore=/path/to/keystore

  ）
• 构建您自己的实现，该实现可以以任何方式加载密钥库（这肯定是最复杂的）

密钥库只是一个文件，其中包含可用于各种用途的密钥和/或证书，在本例中是应用程序需要信任的证书。Keytool可按如下方式使用：

keytool -importcert -file /path/to/certificate/file -keystore /path/to/keystore

对于其他命令行选项，只需运行

keytool -help

---

非常感谢。你可能帮我找到了一份工作。伙计，这是一个多么令人满意的反馈；）