使用Java运行时执行openssl命令

Question

我正在尝试执行openssl命令进行加密。我试图通过java运行时启动openssl。

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ExecuteShellCommand {

public static void main(String[] args) {

    ExecuteShellCommand obj = new ExecuteShellCommand();

    String command="echo \'StringtoEncrypt\' | \\openssl enc -a -e -aes-256-cbc -nosalt -pass pass:mySecretPass |\\openssl enc -a -d -aes-256-cbc -nosalt -pass pass:mySecretPass";

    String output = obj.executeCommand(command);        

    System.out.println(output);
}

private String executeCommand(String command) {

    StringBuffer output = new StringBuffer();

    Process p;
    try {
        p = Runtime.getRuntime().exec(command);
        p.waitFor();
        BufferedReader reader = 
                        new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";           
        while ((line = reader.readLine())!= null) {
            output.append(line + "\n");
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return output.toString();
}}

当这个类运行时，它只运行echo 'StringtoEncrypt' | \openssl enc -a -e -aes-256-cbc -nosalt -pass pass:mySecretPass |\openssl enc -a -d -aes-256-cbc -nosalt -pass pass:mySecretPass。

它不会执行openssl。看起来只有echo部分被执行但不是openssl。当我在控制台中执行它时，该命令运行良好。