java to python, text files or dynamic parameter passing by value problem perfect solution

As business needs to python file parameter passing, a perfect solution to this problem through the following two java method, my idea is: First, I have to first delete the last written argument, the second argument I want to write the new file in python .

The first solution to the problem delete the last parameter passed.

The second way to solve the parameters passed to the python file

　　

    /**
     * @param file python文件的路径
     * @return
     * @throws IOException
     */
    private List<String> readAndRemoveFirstLines(File file) throws IOException{
　　　　　//删除第一行内容
        int lineNum=1;
        List<String> strList = new ArrayList<String>();
        RandomAccessFile raf = null;
        try {
            raf = new RandomAccessFile(file, "rw");
            //Initial write position
            long writePosition = raf.getFilePointer();
            for (int i = 0; i < lineNum; i++) {
                String line = raf.readLine();
                if (line == null) {
                    break;
                }
                strList.add(line);
            }

            // Shift the next lines upwards.
            long readPosition = raf.getFilePointer();
            byte[] buff = new byte[1024];
            int n;
            while (-1 != (n = raf.read(buff))) {
                raf.seek(writePosition);
                raf.write(buff, 0, n);
                readPosition += n;
                writePosition += n;
                raf.seek(readPosition);

            }
            raf.setLength(writePosition);

        } catch(IOException e){
            throw e;
        } finally{
            try{
                if(raf != null){
                    raf.close();
                }
            } The catch (IOException E) {
                 the throw E; 
            } 
        } 
        return strlist; 
    } 
    / ** 
     * @param filePath python file path 
     * @param Contents variable python incoming file, the value can only 
     * @throws IOException
      * / 
    public  void addContainsToFile (filePath String, String Contents) throws IOException {
         // . 1, the parameter calibration 
        int position = 0 ; 
        File File = new new File (filePath);
         //Python content definition files are written
        Content = String "DIS =" + + Contents "Meters" + "\ n-" ;
         // determine whether the file exists 
        IF ((File.Exists () &&! File.isFile ())) { 
            System.out.println ( " file does not exist ~ " );
             return ; 
        } 
        // determining whether legitimate position 
        iF ((position <0) || (position> file.length ())) { 
            System.out.println ( " illegal ~ position " );
             return ; 
        } 
        // 2, creates a temporary file 
        file TEMPFILE = File.createTempFile ( "sss", ".temp", new new file ( "D: /"));
        //3, the input stream file, file output stream of documents to operate 
        a FileOutputStream the outputStream = new new a FileOutputStream (TEMPFILE); 
        the FileInputStream inputStream = new new the FileInputStream (TEMPFILE);
         // automatically deleted upon exiting the JVM exits 
        tempFile.deleteOnExit ();
         // . 4 create RandomAccessFile flow 
        RandomAccessFile rw = new new RandomAccessFile (file, "rw" );
         // file specifies the location to position 
        rw.seek (position);
         int tmp;
         // 5, the content of position after position to write temporary files 
        the while ( ! (tmp = rw.read ()) = -1 ) {
            OutputStream.write (tmp); 
        } 
        // 6, the additional content contents written position location 
        rw.seek (position); 
        rw.write (content.getBytes ()); 
        // 7, will be written back to temporary files, and the created flow off 
        the while ((tmp = InputStream.read ()) = -1! ) { 
            rw.write (tmp); 
        } 
        rw.close (); 
        outputStream.close (); 
        inputStream.close (); 
    }

I use Junit test methods for testing:

  @Test
     public   void   testAddLine () throws IOException {
         the try {
             // important to note that: 1. the order of execution of the following three methods can not be changed; the first line 2.python file must be added the value of the default parameter dis; 3 Fill in the file path correct 


            // this method is used to remove the first line python file content, default parameters must add the value of the first line dis python file, such as: dis = + 200 is 'Meter' 
            readAndRemoveFirstLines ( new new file ( "E: \\ Demo pointbufferandpolygon.py \\ " )); // variable this method is used to add the first line of the file python dis values Note: in this method, the variable name has been written to die, to modify the variable name, refer to this method 
            addContainsToFile (" E: \\ \\ pointbufferandpolygon.py Demo "," 90000 " ); 
        } the catch (IOException E) { 
            e.printStackTrace ();
        } catch(Exception e) { 
            e.printStackTrace (); 
        } 
    }

Renderings:

If you want to pass multiple parameters? I have achieved here, also had a package through the above code, you can leave a message if you need to explore.