Java常用工具类代码整理——之字符编码工具类

package com.jarvis.base.util;

import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;

/**   
 * @Title: Base64Util.java
 * @Description:字符编码工具类
 * @author 狂奔的程序猿 
 * @date 2022年8月7日 15:10:32
 * @version V1.0   
 */
public class CharHelper {

   /**
    * 转换编码 ISO-8859-1到GB2312
    * 
    * @param text
    * @return
    */
   public static final String ISO2GB(String text) {
      String result = "";
      try {
         result = new String(text.getBytes("ISO-8859-1"), "GB2312");
      } catch (UnsupportedEncodingException ex) {
         result = ex.toString();
      }
      return result;
   }

   /**
    * 转换编码 GB2312到ISO-8859-1
    * 
    * @param text
    * @return
    */
   public static final String GB2ISO(String text) {
      String result = "";
      try {
         result = new String(text.getBytes("GB2312"), "ISO-8859-1");
      } catch (UnsupportedEncodingException ex) {
         ex.printStackTrace();
      }
      return result;
   }

   public static String GBK2UTF8(String strVal) {
      try {
         if (strVal == null) {
            return "";
         } else {
            strVal = new String(strVal.getBytes("GBK"), "UTF-8");
            return strVal;
         }
      } catch (Exception exp) {
         return "";
      }
   }

   /**
    * 字符串从GBK编码转换为Unicode编码
    * 
    * @param text
    * @return
    */
   public static String GBK2Unicode(String text) {
      String result = "";
      int input;
      StringReader isr;
      try {
         isr = new StringReader(new String(text.getBytes(), "GBK"));
      } catch (UnsupportedEncodingException e) {
         return "-1";
      }
      try {
         while ((input = isr.read()) != -1) {
            result = result + "&#x" + Integer.toHexString(input) + ";";

         }
      } catch (IOException e) {
         return "-2";
      }
      isr.close();
      return result;

   }

   /**
    * 字符串从ISO-8859-1编码转换为UTF-8编码
    * 
    * @param strVal
    * @return Return:String Description:
    */
   public static String ISO2UTF8(String strVal) {
      try {
         if (strVal == null) {
            return "";
         } else {
            strVal = new String(strVal.getBytes("ISO-8859-1"), "UTF-8");
            return strVal;
         }
      } catch (Exception exp) {
         return "";
      }
   }

   /**
    * 字符串从UTF-8编码转换为ISO-8859-1编码
    * 
    * @param strVal
    * @return Return:String Description:
    */
   public static String UTF82ISO(String strVal) {
      try {
         if (strVal == null) {
            return "";
         } else {
            strVal = new String(strVal.getBytes("UTF-8"), "ISO-8859-1");
            return strVal;
         }
      } catch (Exception exp) {
         return "";
      }
   }

   /**
    * 把字符串转换为UTF8859编码
    *
    * @param source
    * 需要进行转换的字符串
    */
   public static final String GBKto8859(String source) {
      String temp = null;
      if (source == null || source.equals("")) {
         return source;
      }
      try {
         temp = new String(source.getBytes("GBK"), "8859_1");
      } catch (Exception e) {
         e.printStackTrace();
         System.err.println("Convert code Error");
      }
      return temp;
   }

   /**
    * 把字符串转换为GBK编码
    *
    * @param source
    * 需要进行转换的字符串
    */
   public static final String toGBK(String source) {
      String temp = null;
      if (source == null || source.equals("")) {
         return source;
      }
      try {
         temp = new String(source.getBytes("8859_1"), "GBK");
      } catch (Exception e) {
         e.printStackTrace();
         System.err.println("Convert code Error");
      }
      return temp;
   }

   /**
    * 把字符串转换为gb2312编码
    *
    * @param source
    * 需要进行转换的字符串
    */
   public static final String toGb2312(String source) {
      String temp = null;
      if (source == null || source.equals("")) {
         return source;
      }
      try {
         temp = new String(source.getBytes("8859_1"), "GB2312");
      } catch (Exception e) {
         e.printStackTrace();
         System.err.println("转换字符串为gb2312编码出错");
      }
      return temp;
   }

   /**
    * 把中文字符串，转换为unicode字符串
    *
    * @param source
    * 需要进行转换的字符串
    * @return 转换后的unicode字符串
    */
   public static String chineseToUnicode(String source) {
      if (source == null || source.trim().length() == 0) {
         return source;
      }
      String unicode = null;
      String temp = null;
      for (int i = 0; i < source.length(); i++) {
         temp = "\\u" + Integer.toHexString((int) source.charAt(i));
         unicode = unicode == null ? temp : unicode + temp;
      }
      return unicode;
   }

   /**
    * 在将数据存入数据库前转换
    * 
    * @param strVal
    *            要转换的字符串
    * @return 从“ISO8859_1”到“GBK”得到的字符串
    * @since 1.0
    */
   public static String toChinese(String strVal) {
      try {
         if (strVal == null) {
            return "";
         } else {
            strVal = strVal.trim();
            strVal = new String(strVal.getBytes("ISO8859_1"), "GBK");
            return strVal;
         }
      } catch (Exception exp) {
         return "";
      }
   }

   /**
    * Utf8URL编码
    * 
    * @param text
    * @return
    */
   public static final String Utf8URLencode(String text) {
      StringBuffer result = new StringBuffer();

      for (int i = 0; i < text.length(); i++) {

         char c = text.charAt(i);
         if (c >= 0 && c <= 255) {
            result.append(c);
         } else {

            byte[] b = new byte[0];
            try {
               b = Character.toString(c).getBytes("UTF-8");
            } catch (Exception ex) {
            }

            for (int j = 0; j < b.length; j++) {
               int k = b[j];
               if (k < 0)
                  k += 256;
               result.append("%" + Integer.toHexString(k).toUpperCase());
            }

         }
      }

      return result.toString();
   }

   /**
    * Utf8URL解码
    * 
    * @param text
    * @return
    */
   public static final String Utf8URLdecode(String text) {
      String result = "";
      int p = 0;

      if (text != null && text.length() > 0) {
         text = text.toLowerCase();
         p = text.indexOf("%e");
         if (p == -1)
            return text;

         while (p != -1) {
            result += text.substring(0, p);
            text = text.substring(p, text.length());
            if (text == "" || text.length() < 9)
               return result;

            result += CodeToWord(text.substring(0, 9));
            text = text.substring(9, text.length());
            p = text.indexOf("%e");
         }

      }

      return result + text;
   }

   /**
    * utf8URL编码转字符
    * 
    * @param text
    * @return
    */
   private static final String CodeToWord(String text) {
      String result;

      if (Utf8codeCheck(text)) {
         byte[] code = new byte[3];
         code[0] = (byte) (Integer.parseInt(text.substring(1, 3), 16) - 256);
         code[1] = (byte) (Integer.parseInt(text.substring(4, 6), 16) - 256);
         code[2] = (byte) (Integer.parseInt(text.substring(7, 9), 16) - 256);
         try {
            result = new String(code, "UTF-8");
         } catch (UnsupportedEncodingException ex) {
            result = null;
         }
      } else {
         result = text;
      }

      return result;
   }

   /**
    * 编码是否有效
    * 
    * @param text
    * @return
    */
   @SuppressWarnings("unused")
   private static final boolean Utf8codeCheck(String text) {
      String sign = "";
      if (text.startsWith("%e"))
         for (int i = 0, p = 0; p != -1; i++) {
            p = text.indexOf("%", p);
            if (p != -1)
               p++;
            sign += p;
         }
      return sign.equals("147-1");
   }

   /**
    * 判断是否Utf8Url编码
    * 
    * @param text
    * @return
    */
   public static final boolean isUtf8Url(String text) {
      text = text.toLowerCase();
      int p = text.indexOf("%");
      if (p != -1 && text.length() - p > 9) {
         text = text.substring(p, p + 9);
      }
      return Utf8codeCheck(text);
   }
}

本文链接地址：http://www.ysxbohui.com/article/57