Go语言视频零基础入门到精通

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1.建立密钥库：
keytool -genkey -v -keyalg RSA -alias test -keystore sslkeystore
其中；－keyalg RSA表示密钥算法RSA，-alias test 表示别名test，-keystore sslkeystore 表示密钥库名为sslkeystore
2. 制作 证书文件：制作证书是从密钥库输出特定别名的证书，保存到证书文件test.cer中。
keytool -export -alias test -file test.cer -keystore sslkeystore

3.将证书文件test.cer导入自己的密钥库test:
keytool -import -alias test -file test.cer -keystore test

4.SSL服务端程序：
SSLServerExample.java

1. package com.cjq.save;
3. import java.io.IOException;
4. import java.io.PrintWriter;
5. import java.net.ServerSocket;
6. import java.net.Socket;
8. import javax.net.ssl.SSLServerSocketFactory;
10. //SSL服务器端程序
11. public class SSLServerExample {
13.         public static void main(String[] args) throws IOException{
14.                 System.setProperty("javax.net.ssl.keyStore","sslkeystore");
15.                 System.setProperty("javax.net.ssl.keyStorePassword", "123456");
16.                 //创建SSLServerSocketFactory类对象。利用getDefault()方法建立一个强制转换成的SSLServerSocketFactory类对象
17.                 SSLServerSocketFactory sslsf = (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();
18.                 //建立服务器套接口ServerSocket类对象，其端口8080
19.                 ServerSocket ss = sslsf.createServerSocket(8080);
20.                 System.out.println("Waiting for connection...");
21.                
22.                 while(true){
23.                         Socket  s= ss.accept();
24.                         System.out.println("Client connection made");
25.                         //
26.                         PrintWriter out = new PrintWriter(s.getOutputStream());
27.                         out.println("HI");
28.                         System.out.println("HI is sent to client");
29.                        
30.                        
31.                         out.close();
32.                         s.close();
33.                 }
34.         }
36. }

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5.SSL客户端程序：
SSLClientExample.java:

1. package com.cjq.save;
3. import java.io.BufferedReader;
4. import java.io.IOException;
5. import java.io.InputStreamReader;
6. import java.net.Socket;
8. import javax.net.ssl.SSLSocketFactory;
10. //SSL客户端程序
11. public class SSLClientExample {
13.         public static void main(String[] args) throws IOException{
14.                 //
15.                 System.setProperty("javax.net.ssl.trustStore", "test");
16.                 System.setProperty("javax.net.ssl.keyStorePassword", "123456");
17.                 SSLSocketFactory sslsf = (SSLSocketFactory)SSLSocketFactory.getDefault();
18.                
19.                 Socket s = sslsf.createSocket("127.0.0.1",8080);
20.                 System.out.println("the connection is ok");
21.                
22.                 BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
23.                
24.                 System.out.println(in.readLine());
25.                
26.                 in.close();
27.                 s.close();
28.                
29.                 System.out.println("the connection is close");
30.         }
32. }

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6.运行程序：
cmd窗口运行，且程序中System.setProperty(..,...)的代码是不存在的时候：
java  -Djavax.net.ssl.keyStore=sslkeystore -Djava.net.ssl.keyStorePassword=123456 SSLClientExample
则会出现错误：

1. Exception in thread "main" java.net.SocketException: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: com.sun.net.ssl.internal.ssl.DefaultSSLContextImpl)
2.         at javax.net.ssl.DefaultSSLServerSocketFactory.throwException(Unknown Source)
3.         at javax.net.ssl.DefaultSSLServerSocketFactory.createServerSocket(Unknown Source)
4.         at com.cjq.save.SSLServerExample.main(SSLServerExample.java:16)
5. Caused by: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: com.sun.net.ssl.internal.ssl.DefaultSSLContextImpl)
6.         at java.security.Provider$Service.newInstance(Unknown Source)
7.         at sun.security.jca.GetInstance.getInstance(Unknown Source)
8.         at sun.security.jca.GetInstance.getInstance(Unknown Source)
9.         at javax.net.ssl.SSLContext.getInstance(Unknown Source)
10.         at javax.net.ssl.SSLContext.getDefault(Unknown Source)
11.         at javax.net.ssl.SSLServerSocketFactory.getDefault(Unknown Source)
12.         at com.cjq.save.SSLServerExample.main(SSLServerExample.java:14)
13. Caused by: java.security.UnrecoverableKeyException: Password must not be null
14.         at sun.security.provider.JavaKeyStore.engineGetKey(Unknown Source)
15.         at sun.security.provider.JavaKeyStore$JKS.engineGetKey(Unknown Source)
16.         at java.security.KeyStore.getKey(Unknown Source)
17.         at com.sun.net.ssl.internal.ssl.SunX509KeyManagerImpl.<init>(Unknown Source)
18.         at com.sun.net.ssl.internal.ssl.KeyManagerFactoryImpl$SunX509.engineInit(Unknown Source)
19.         at javax.net.ssl.KeyManagerFactory.init(Unknown Source)
20.         at com.sun.net.ssl.internal.ssl.DefaultSSLContextImpl.getDefaultKeyManager(Unknown Source)
21.         at com.sun.net.ssl.internal.ssl.DefaultSSLContextImpl.<init>(Unknown Source)
22.         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
23.         at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
24.         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
25.         at java.lang.reflect.Constructor.newInstance(Unknown Source)
26.         at java.lang.Class.newInstance0(Unknown Source)
27.         at java.lang.Class.newInstance(Unknown Source)
28.         ... 7 more

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原因是密码为空，但实际上参数中有“-Djava.net.ssl.keyStorePassword=123456”这个，密码不应该为空， 却报空， 目前不解。
但将java 之后两个参数写在程序中：

1.                 System.setProperty("javax.net.ssl.keyStore","sslkeystore");
2.                 System.setProperty("javax.net.ssl.keyStorePassword", "123456");

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则正常运行。