Question

我有一些问题。当我运行命令时：

openssl md5 "./build/outputs/apk/myApp.apk"

我得到了我需要的结果，所以openssl工作正常。然后是我的Java代码：

String md5_cmd = "openssl md5 \"./build/outputs/apk/myApp.apk\"";

String md5Str = obj.executeCommand(md5_cmd);
String whichCmd = obj.executeCommand("which openssl"); //For testing executeCommand

 System.out.println(md5Str); //Not prints anything  
 System.out.println(whichCmd); //Prints the result just Fine    

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);
        }

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

    return output.toString();

}

所以，第一个命令“md5_cmd”没有显示任何输出，虽然如果我直接通过命令行运行它就行了。带有“whichCmd”的第二个命令按预期工作。你能建议吗？

Answer 1

而不是使用单个字符串运行命令

String md5_cmd = "openssl md5 \"./build/outputs/apk/myApp.apk\"";

带参数的命令应使用String []

运行

String[] md5_cmd = {"openssl", "md5", "./build/outputs/apk/myApp.apk"};

通过Java在unix中运行命令行

1 个答案: