If you want to authenticate you need the private key - there is no other option. A certificate is a public key with extra properties (like company name, country,...) that is signed by some Certificate authority that guarantees that the attached properties are true. .CER files are certificates and don't have the private key. The private key is provided with a .PFX keystore file normally. If you really authenticate is because you already had imported the private key. You normally can import .CER certificates without any problems with keytool -importcert -file certificate.cer -keystore keystore.jks -alias "Alias"

下面是我一直用于以编程方式将.cer文件导入到新的KeyStore中的代码。

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
//VERY IMPORTANT.  SOME OF THESE EXIST IN MORE THAN ONE PACKAGE!
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;

//Put everything after here in your function.
KeyStore trustStore  = KeyStore.getInstance(KeyStore.getDefaultType());
trustStore.load(null);//Make an empty store
InputStream fis = /* insert your file path here */;
BufferedInputStream bis = new BufferedInputStream(fis);

CertificateFactory cf = CertificateFactory.getInstance("X.509");

while (bis.available() > 0) {
    Certificate cert = cf.generateCertificate(bis);
    trustStore.setCertificateEntry("fiddler"+bis.available(), cert);
}

下面是一个脚本，我用它将当前目录中的一堆crt文件批量导入到java密钥库中。只需将其保存到与证书相同的文件夹中，并像这样运行它:

./import_all_certs.sh

import_all_certs.sh

KEYSTORE="$(/usr/libexec/java_home)/jre/lib/security/cacerts";

function running_as_root()
{
  if [ "$EUID" -ne 0 ]
    then echo "NO"
    exit
  fi

  echo "YES"
}

function import_certs_to_java_keystore
{
  for crt in *.crt; do 
    echo prepping $crt 
    keytool -import -file $crt -storepass changeit -noprompt --alias alias__${crt} -keystore $KEYSTORE
    echo 
  done
}

if [ "$(running_as_root)" == "YES" ]
then
  import_certs_to_java_keystore
else
  echo "This script needs to be run as root!"
fi

您已经拥有的证书可能是服务器证书，或者用于签署服务器证书的证书。您将需要它，这样您的web服务客户机才能对服务器进行身份验证。

But if additionally you need to perform client authentication with SSL, then you need to get your own certificate, to authenticate your web service client. For this you need to create a certificate request; the process involves creating your own private key, and the corresponding public key, and attaching that public key along with some of your info (email, name, domain name, etc) to a file that's called the certificate request. Then you send that certificate request to the company that's already asked you for it, and they will create your certificate, by signing your public key with their private key, and they'll send you back an X509 file with your certificate, which you can now add to your keystore, and you'll be ready to connect to a web service using SSL requiring client authentication.

要生成证书请求，使用"keytool -certreq -alias -file -keypass -keystore "。将生成的文件发送给将要签署该文件的公司。

当你取回你的证书时，运行"keytool -importcert -alias -keypass -keystore "。

如果密钥存储库受到保护(这是个好主意)，那么在这两种情况下都可能需要使用-storepass。

一个开放源码的GUI工具可以在keystore-explorer.org上获得

密钥存储库浏览器 KeyStore资源管理器是Java的开源GUI替代品 命令行实用工具keytool和jarsigner。密钥存储库浏览器 通过直观的图形显示它们的功能 用户界面。

以下画面会有帮助(它们来自官方网站)

运行命令得到的默认屏幕:

shantha@shantha:~$./Downloads/kse-521/kse.sh

点击检查和检查URL选项然后给出你想导入的URL。

如果你给谷歌网站链接，结果窗口将如下所示。

这是用例之一，其余的取决于用户(所有的信用都转到keystore-explorer.org)

这是我的工作方式:

在文本编辑器中按以下格式将证书数据保存为。txt ——开始证书 [微软数据序列化] ——结束证书 打开chrome浏览器(这一步可能也适用于其他浏览器) settings >显示高级设置> HTTPS/SSL >管理证书 在步骤1中导入.txt文件 选择并导出Base-64编码格式的证书。保存为。cer 现在可以使用keytool或Portecle将其导入java密钥存储库