package com.tool;

import java.io.*;

//中文字符級轉換
public class Chinese {

  public static String toUnicode(String strvalue) {
    try {
      if (strvalue == null) {
        return null;
      }
      else {
        strvalue = new String(strvalue.getBytes("GBK"), "ISO8859_1");
        return strvalue;
      }
    }
    catch (Exception e) {
      return "";
    }
  }

  //對輸入的字符串進行一次編碼轉換，防止SQL注入
  public static String StringtoSql(String str) {
    str = nullToString(str, "");
    try {
      str = str.trim().replace('\'', (char) 1);
    }
    catch (Exception e) {
      return "";
    }
    return str;
  }

  //處理字符串中的空值
  public static final String nullToString(String v, String toV) {
    if (v == null) {
      v = toV;
    }
    return v;
  }

  public static String toChinese(String strvalue) {
    try {
      if (strvalue == null) {
        return "";
      }
      else {
        strvalue = new String(strvalue.getBytes("ISO8859_1"), "GBK");
        return strvalue;
      }
    }
    catch (Exception e) {
      return "";
    }
  }

  public static String chinese(String a) {
    try {
      return new String(a.getBytes("ISO-8859-1"));
    }
    catch (UnsupportedEncodingException ex) {
      return null;
    }
  }
}