Summary

This article tell u how to simulate string write to db that come from some application.You will know how it works

Preliminary knowledge

Encodes this String into a sequence of bytes using the named charset,storing the result into a new byte array.

Constructs a new String by decoding the specified array of bytes using the specified charset.

Demo

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try {
    // simulate a db charset UTF-8
    System.setOut(new PrintStream(new File("a.txt"), "UTF-8"));

    // your edit is UTF-8，complie using UTF-8
    String s = "測試";
    byte[] bs = s.getBytes("UTF-8"); //encoding to {e6,b8,ac,e8,a9,a6} 

    // for (int i = 0 ;i<bs.length;i++) {
    //     System.out.println(Integer.toHexString(bs[i]));
    // }

    // simulate get response parameter using big5
    String param = new String(bs, "Big5");// decoding bs array using Big5.You can use visit Query BIG-5 Code website using bs array,and will get 皜祈岫 decoding(e6 b8 ac e8 a9 a6)

    // simulate write to db
    System.out.println(param);//param be encoded using UTF-8 in the txt file and will see 皜祈岫 encoding utf8(e7 9a 9c e7 a5 88 e5 b2 ab)
} catch (Exception e) {

}

encoding and decoding

reference