golang exec.Command执行cmd，jar包自定义输入与输出

实时输出， 自定义回话输入
源自：51证明网

func test4() {
	cmd := exec.Command("openssl")

	stdout, _ := cmd.StdoutPipe()
	stderr, _ := cmd.StderrPipe()

	stdin, _ := cmd.StdinPipe()

	cmd.Start()

	// 读
	var wg sync.WaitGroup
	wg.Add(3)
	go func() {
		defer wg.Done()
		for {
			buf := make([]byte, 1024)
			n, err := stderr.Read(buf)

			if n > 0 {
				fmt.Println(string(buf[:n]))
			}

			if n == 0 {
				break
			}

			if err != nil {
				log.Printf("read err %v", err)
				return
			}
		}
	}()

	go func() {
		defer wg.Done()
		for {
			buf := make([]byte, 1024)
			n, err := stdout.Read(buf)

			if n == 0 {
				break
			}

			if n > 0 {
				fmt.Println(string(buf[:n]))
			}

			if n == 0 {
				break
			}

			if err != nil {
				log.Printf("read out %v", err)
				return
			}

		}
	}()

	// 写
	go func() {
		stdin.Write([]byte("version\n\n"))
		stdin.Write([]byte("ciphers -v\n\n"))
		stdin.Write([]byte("s_client -connect razeencheng.com:443"))
		stdin.Close()
		wg.Done()
	}()

	wg.Wait()
	err := cmd.Wait()
	if err != nil {
		log.Printf("cmd wait %v", err)
		return
	}

}```