dataformat.java

基于JSP的网上书店.功能较为全面 开发环境:sql server2000+tomcat+jdk

package bookshop.util;

/**
* <p>负责字符串的处理 </p>
*/
import java.lang.*;
import java.util.*;

public class dataFormat
{
    public dataFormat()
    {
    }
    /**
    * 把字符串转换成适合于网页显示的文本
    * @param s
    * @return
    */
    public static String toHtml(String s)
    {
        if (s==null) return s;
        s=strReplace(s,"&","&amp;");
        s=strReplace(s,"<","&lt;");
        s=strReplace(s,">","&gt;");
        s=strReplace(s,"\"","&quot;");
        s=parseReturn(s,"<br>\n&nbsp;&nbsp;&nbsp;&nbsp;");
        return s;
    }
    /**
    * 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();
    }
    /**
    * 把字符串中的"\r\n"转换成"\n"
    * @param String sBody  : 要进行替换操作的字符串
    * @param String sEndwith : 要替换成为的字符串
    */
    public static String parseReturn(String sBody, String sEndwith)
    {
        StringTokenizer t = new StringTokenizer(sBody, "\r\n");
        StringBuffer sss = new StringBuffer(sBody.length());
        boolean bFirst=true;
        if (sEndwith.trim().equals("")) sEndwith="\n";
        while (t.hasMoreTokens())
        {
            String s=t.nextToken();
            s=s.trim();
            while (s.startsWith("　")) s=s.substring(2);
            if (!s.equals(""))
            {
                if (bFirst)
                {
                    bFirst=false;
                }
                else
                {
                    sss.append(sEndwith);
                }
                sss.append(s);
            }
        }
        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, "&", "&amp;");
        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)
    {
        if( str == null || str.equals("") )
        {
            return "";
        }

        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;
    }

    public static String toString(String gbStr)
    {
        return gbStr;
    }
}