原文：https://www.jianshu.com/p/89ca5b635d3f
我是个搬运工
目录
- 1.安装证书
- 2.使用阿里仓库
- 3.刷新缓存使配置生效
1.安装证书
（1）准备安装证书的java代码
注意，该文件与上篇文章的文件内容不一样，所以不要使用上一篇文章InstallCert.java文件来进行下面的操作！！该文件集成了新建项目要用到的域名"dl.google.com", "maven.aliyun.com", "jcenter.bintray.com", "d29vzk4ow07wi7.cloudfront.net"，后续操作会一次性添加这些证书，如果你还有其它的域名，在代码中的hosts加上即可
- 点击下载：InstallCert.java（推荐，如果打开是源码而不是文件，右键浏览器另存为，保存名为InstallCert.java即可）
- 也可以新建一个InstallCert.java文件，然后复制以下代码。
/*
* Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Sun Microsystems nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import java.io.*;
import java.security.*;
import java.security.cert.*;
import java.util.Scanner;
import javax.net.ssl.*;
public class InstallCert {
public static int certCount = 0;
public static StringBuilder stringBuilder = new StringBuilder();
public static void main(String[] args) {
//if you hava other host, you can add host to it
String[] hosts = new String[]{"dl.google.com", "maven.aliyun.com", "jcenter.bintray.com", "d29vzk4ow07wi7.cloudfront.net"};
for (String host : hosts) {
addCert(host);
}
System.out.println("Success Add Cert Count:"+certCount);
System.out.println("Add Error:"+stringBuilder.toString());
}
public static void addCert(String host) {
try {
int port = 443; //Server Port
String p = "changeit"; //default is changeit
char[] passphrase = p.toCharArray();
String tfilePath = new File(new File("").getAbsolutePath()).getParentFile().getAbsolutePath();
System.out.println(new File("").getAbsolutePath());
File file = new File(tfilePath + "/jre/lib/security/cacerts");
System.out.println("Loading KeyStore " + file.getAbsolutePath() + "...");
InputStream in = new FileInputStream(file);
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(in, passphrase);
in.close();
SSLContext context = SSLContext.getInstance("TLS");
TrustManagerFactory tmf =
TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(ks);
X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
context.init(null, new TrustManager[]{tm}, null);
SSLSocketFactory factory = context.getSocketFactory();
System.out.println("Opening connection to " + host + ":" + port + "...");
SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
socket.setSoTimeout(10000);
try {
System.out.println("Starting SSL handshake...");
socket.startHandshake();
socket.close();
System.out.println();
System.out.println("No errors, certificate is already trusted");
} catch (SSLException e) {
System.out.println();
e.printStackTrace(System.out);
}
X509Certificate[] chain = tm.chain;
if (chain == null) {
System.out.println("Could not obtain server certificate chain");
return;
}
BufferedReader reader =
new BufferedReader(new InputStreamReader(System.in));
System.out.println();
System.out.println("Server sent " + chain.length + " certificate(s):");
System.out.println();
MessageDigest sha1 = MessageDigest.getInstance("SHA1");
MessageDigest md5 = MessageDigest.getInstance("MD5");
for (int i = 0; i < chain.length; i++) {
X509Certificate cert = chain[i];
System.out.println
(" " + (i + 1) + " Subject " + cert.getSubjectDN());
System.out.println(" Issuer " + cert.getIssuerDN());
sha1.update(cert.getEncoded());
System.out.println(" sha1 " + toHexString(sha1.digest()));
md5.update(cert.getEncoded());
System.out.println(" md5 " + toHexString(md5.digest()));
System.out.println();
}
//jump user input
System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
int k = 0;
X509Certificate cert = chain[k];
String alias = host + "-" + (k + 1);
ks.setCertificateEntry(alias, cert);
OutputStream out = new FileOutputStream(file);
ks.store(out, passphrase);
out.close();
System.out.println();
System.out.println(cert);
System.out.println();
System.out.println
("Added certificate to keystore 'jssecacerts' using alias '"
+ alias + "'");
certCount++;
} catch (Exception e) {
e.printStackTrace();
stringBuilder.append(host+"=======");
}
}
private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();
private static String toHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder(bytes.length * 3);
for (int b : bytes) {
b &= 0xff;
sb.append(HEXDIGITS[b >> 4]);
sb.append(HEXDIGITS[b & 15]);
sb.append(' ');
}
return sb.toString();
}
private static class SavingTrustManager implements X509TrustManager {
private final X509TrustManager tm;
private X509Certificate[] chain;
SavingTrustManager(X509TrustManager tm) {
this.tm = tm;
}
public X509Certificate[] getAcceptedIssuers() {
throw new UnsupportedOperationException();
}
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
throw new UnsupportedOperationException();
}
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
this.chain = chain;
tm.checkServerTrusted(chain, authType);
}
}
}
（2）将证书文件放到AndroidStudio的java目录里
把InstallCert.java移动到 “AndroidStudio安装目录/jre/bin”目录下，注意！不是jre/jre/bin目录下，不要弄错了，如下图所示
1.jpg
（3）导入证书
-
以管理员身份打开cmd进入到该目录，您也可以在地址栏直接输入cmd可快速进入该目录，如图所示
3.png
4.png
- 在cmd输入javac InstallCert.java然后回车编译代码， 随后输入java InstallCert运行程序，等待程序结束运行即可！
C:\FastSoftwore\AndroidStudio\jre\bin>javac InstallCert.java
C:\FastSoftwore\AndroidStudio\jre\bin>java InstallCert
-
当cmd窗口最后出现Add Error为空表示所有证书导入完成
5.png
2.使用阿里仓库
（1）加入阿里仓库地址
这个步骤可以加快你项目构建的速度，为了节省您的时间，推荐你将阿里仓库加入到你的项目中
- 打开Project级别的build.gradle文件，google()之上加入以下代码，建议加在最上面，以便优先使用该地址（如图所示，有两处地方需要加上）
//阿里仓库服务，加快依赖下载速度
maven{ url 'https://maven.aliyun.com/repository/google/'}
maven{ url 'https://maven.aliyun.com/repository/jcenter/'}
6.png
3.刷新缓存使配置生效
-
** 点击File->Invalidate Caches / Restart ** 刷新缓存并重启
7.png
-
** 在弹出的窗口中选择Invalidate and Restart 确认刷新缓存并重启 **
8.png
-- ** 当AndroidStudio自动重启后，发现运行按钮是灰色的，并且右下角也没有Gradle进程在运行，可以尝试点击File->Sync Project with Gradle Files来同步项目
9.png
到这一步，问题基本已经解决，如果问题没解决，你应该检查你是否改过AndroidStudio使用的java环境，基本上AndroidStudio默认使用自带的java环境，除非你手动设置过，如果确实没动过，可尝试多同步一下项目看看（File->Sync Project with Gradle Files），因为有时候网络不好，导致下载失败，也会引起这个问题】（完）
作者：简简单单_a0b0
链接：https://www.jianshu.com/p/b4ad6ccbe445
来源：简书
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