java - 在 bash 中调用 Java 可执行文件

Question

我想通过编译以下代码来调用Java类文件:

import java.io.*;

public class hex_to_dec { 
    private BufferedReader bufferedReader;
    private BufferedWriter bufferedWriter;

    public hex_to_dec (String stringPath, String stringPath_dec)
    {
        try
        {
            bufferedReader = new BufferedReader(new FileReader(stringPath));
            bufferedWriter = new BufferedWriter(new FileWriter(stringPath_dec, false));
        } catch (Exception e) {
            System.out.println("Error in opening file." + e);
        }
    }
    public void Parse() 
    {
        try {
            String tempLine;
            int temp;           
            while((tempLine = bufferedReader.readLine()) != null) {
                String[] tempBytes = tempLine.split(" ");
                temp = Integer.valueOf(tempBytes[0], 16);
                tempBytes[0] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[2], 16); 
                tempBytes[2] = String.valueOf(((byte) temp));
                temp = Integer.valueOf(tempBytes[3], 16);  
                tempBytes[3] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[5], 16);
                tempBytes[5] = String.valueOf(((byte) temp));
                temp = Integer.valueOf(tempBytes[6], 16);
                tempBytes[6] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[8], 16);
                tempBytes[8] = String.valueOf(((byte) temp));
                temp = Integer.valueOf(tempBytes[9], 16);
                tempBytes[9] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[11], 16);
                tempBytes[11] = String.valueOf(((byte) temp));
                temp = Integer.valueOf(tempBytes[12], 16);
                tempBytes[12] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[14], 16);
                tempBytes[14] = String.valueOf(((byte) temp));
                temp = Integer.valueOf(tempBytes[15], 16);
                tempBytes[15] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[17], 16);
                tempBytes[17] = String.valueOf(((byte) temp));
                temp = Integer.valueOf(tempBytes[18], 16);
                tempBytes[18] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[20], 16);
                tempBytes[20] = String.valueOf(((byte) temp));
                temp = Integer.valueOf(tempBytes[21], 16);
                tempBytes[21] = String.valueOf((temp));
                temp = Integer.valueOf(tempBytes[23], 16);
                tempBytes[23] = String.valueOf(((byte) temp));

                            for (int i = 0; i < tempBytes.length; i++)
                {
                    bufferedWriter.append(tempBytes[i] + " ");
                }
                bufferedWriter.append("\n");                
            }
            bufferedWriter.flush();
        } catch (Exception e) {
            System.err.println("Error:" + e);
        }
    }
    /**
     * @param args
     */
    public static void main(String[] args) { 
        // TODO Auto-generated method stub
        hex_to_dec data = new hex_to_dec(
                "C:\\Documents and Settings\\Admin\\My Documents\\MATLAB\\tests\\rssi_2\\trimmed\\s5_node12",
                "C:\\Documents and Settings\\Admin\\My Documents\\MATLAB\\tests\\rssi_2\\trimmed_dec\\s5_node12"); 
        data.Parse();
    }  
}

但是，它需要一个参数，而且我不知道如何传递参数来在 bash 中调用此命令清理。另外，我希望能够解析一个目录，以便通过所选目录的子目录下的所有文本文件递归地调用此函数。实现这一目标的最简单方法是什么？

提前致谢!希望这不是太苛刻。

Answer 1

我认为你在这里有几个步骤，首先是更改 main 以使用参数。您应该检查 args.length 以确保指定了源文件，例如:

(警告:未经 C 程序员测试的 java)

public static void main(String[] args)
{
  if (args.length == 1)
  {
    hex_to_dec data = new hex_to_dec(args[0], args[0] + ".dec");
    data.Parse();
  }
}

一旦类接受参数，您将需要编译它。

javac hex_to_dec.java

编译完成后，您可以使用脚本递归地处理目录。

#!/bin/sh
find . | xargs -L 1 java hex_to_dec

请注意，如果您的目标是将十六进制数字文件转换为十进制，那么使用 java 和 bash 可能有点大材小用。您可以使用单个 shell 脚本来完成此操作，例如:

#!/bin/sh
find . -type f | while read filename
do

  # skip the file if it is already decoded
  if [ "${filename%.dec}" != "${filename}" -o -z "${filename}" ]
  then
    continue
  fi

  (
    # read the file, line by line
    cat "${filename}" | while read line
    do
      line=$(
        echo "${line}"                   |
        sed -e "s/[[:space:]]\{1,\}/;/g" | # split the line by spaces
        tr '[:lower:]' '[:upper:]')        # convert lower to uppercase

       echo "ibase=16; ${line}"          | # format the line for bc
        bc                               | # convert hex to dec
        tr "\n" " "                        # rejoin the output to a line

      echo ""                              # add the new line
    done
  ) > "${filename}.dec"
done