dataformate.java

JSP开发的学习系统

package grad.util;
import java.util.*;
public class DataFormate {
  public DataFormate() {
  }
     /**
      * 把字符串sBody中的sFrom用sTo替换
      * @param sBody
      * @param sFrom
      * @param sTo
      * @return
      */
     public static String strReplace(String sBody, String sFrom, String sTo) {
        int i,j,k,l;
        if (sBody==null || sBody.equals("")) return "";
        i = 0;
        j = sFrom.length();
        k = sTo.length();
        StringBuffer sss = new StringBuffer(sBody.length());
        boolean bFirst=true;
        l = i;
        while (sBody.indexOf(sFrom,i)!=-1) {
          i = sBody.indexOf(sFrom,i);
          sss.append(sBody.substring(l,i));
          sss.append(sTo);
          i += j;
          l = i;
        }
        sss.append(sBody.substring(l));
        return sss.toString();
      }

        /**
            * 将字符串格式化成 HTML 代码输出
            * 只转换特殊字符，适合于 HTML 中的表单区域
            * @param str 要格式化的字符串
            * @return 格式化后的字符串
            */
           public static String toHtmlInput(String str) {
               if (str == null)    return null;
               String html = new String(str);
               html = strReplace(html, "&", "&");
               html = strReplace(html, "<", "&lt;");
               html = strReplace(html, ">", "&gt;");
               return html;
           }
        /**
       * 将普通字符串格式化成数据库认可的字符串格式
       * @param str 要格式化的字符串
       * @return 合法的数据库字符串
       */
      public static String toSql(String str) {
          String sql = new String(str);
          return strReplace(sql, "'", "''");
      }
      /**
       * 把字符串转换成GBK编码
       * @param uniStr
       * @return
       */
      public static String toGb(String uniStr){
        String gbStr = "";
        if(uniStr == null){
          uniStr = "";
        }
        try{
          byte[] tempByte = uniStr.getBytes("ISO8859_1");
          gbStr = new String(tempByte,"GB2312");
        }
        catch(Exception ex){
          System.out.println(ex.toString());
        }
        return gbStr;
      }
      /**
       * 把字符串转换成uincode编码
       * @param gbStr
       * @return
       */
  public static String toUni(String gbStr){
        String uniStr = "";
        if(gbStr == null){
          gbStr = "";
        }
        try{
          byte[] tempByte = gbStr.getBytes("GB2312");
          uniStr = new String(tempByte,"ISO8859_1");
        }catch(Exception ex){
        }
        return uniStr;
      }
      /**
       * 把字符串转换成Utf8编码
       * @param s
       * @return
       */
  public static String toUtf8String(String s) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < s.length(); i++) {
             char c = s.charAt(i);
              if (c >= 0 && c <= 255) {
                sb.append(c);
                }
              else {
                   byte[] b;
                    try {
                       b = Character.toString(c).getBytes("utf-8");
                     }catch (Exception ex) {
                        System.out.println(ex);
                        b = new byte[0];
                     }
                         for (int j = 0; j < b.length; j++) {
                           int k = b[j];
                           if (k < 0) {
                             k += 256;
                           }
                           sb.append("%" + Integer.toHexString(k).
                                     toUpperCase());
                         }
                       }
                     }
                     return sb.toString();
                   }

}