在windows环境下进行的测试，前提条件，windows上需要先安装openssl。
配置环境变量，查看版本：
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import java.io.*;
import java.util.Properties;
public class OpensslCommand {
private static void runCMD(String[] CMD) {
java.lang.Process process = null;
try {
process = Runtime.getRuntime().exec(CMD);
ByteArrayOutputStream resultOutStream = new ByteArrayOutputStream();
InputStream errorInStream = new BufferedInputStream(process.getErrorStream());
InputStream processInStream = new BufferedInputStream(process.getInputStream());
int num = 0;
byte[] bs = new byte[1024];
while ((num = errorInStream.read(bs)) != -1) {
resultOutStream.write(bs, 0, num);
}
while ((num = processInStream.read(bs)) != -1) {
resultOutStream.write(bs, 0, num);
}
String result = new String(resultOutStream.toByteArray(), "gbk");
System.out.println(result);
errorInStream.close();
processInStream.close();
resultOutStream.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (process != null) process.destroy();
}
}
public static void main(String[] args) throws Exception {
//需要指定openssl.exe路径
//java生成私钥
String[] cmdPrivateKey = {"cmd", "/C", "C:\\\\soft\\\\OpenSSL-Win64\\\\bin\\\\openssl.exe genrsa -out ca.key 2048"};
//java生成证书请求
String[] cmdCertificationReq = {"cmd", "/C", "C:\\\\soft\\\\OpenSSL-Win64\\\\bin\\\\openssl.exe req -new -key ca.key -out ca.csr -subj /C=CN"};
//java生成证书
String[] cmdCertification = {"cmd", "/C", "C:\\\\soft\\\\OpenSSL-Win64\\\\bin\\\\openssl.exe x509 -req -days 365 -in ca.csr -signkey ca.key -out ca.crt"};
runCMD(cmdPrivateKey);
runCMD(cmdCertificationReq);
runCMD(cmdCertification);
Properties props=System.getProperties(); //系统属性
System.out.println("用户的当前工作目录："+props.getProperty("user.dir"));
}
}
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