utility.java

这个也是关于图书管理系统的代码

package com.xmspk.ebp.comm;

/**
 * Created by IntelliJ IDEA.
 * User: Administrator
 * Date: Apr 29, 2003
 * Time: 4:28:05 PM
 * Author: hjl
 * To change this template use Options | File Templates.
 */

public class Utility {
    public Utility(){

    }

    // use to convert null to ""       showing utility

    public String Covert(Object o)
    {
        String str = new String();
        if (o==null){
            str = "";
            return str;
        }
        else
            return o.toString();
    }

    //use to show special character in character
    public static String Encode(String source)
    {
        if(source == null)
            return "";
        StringBuffer buf = new StringBuffer(source);
        char c = '\0';
        int i = 0;
        int j = 0;
        for(int len = source.length(); j < len;)
        {
            c = source.charAt(j);
            j++;
            if(c == '&')
            {
                buf.insert(i, "&#38");
                buf.setCharAt(i + 4, ';');
                i += 5;
            } else
            if(c == '\n')
            {
                buf.insert(i, "<br");
                buf.setCharAt(i + 3, '>');
                i += 4;
            } else
            if(c == '<')
            {
                buf.insert(i, "&lt");
                buf.setCharAt(i + 3, ';');
                i += 4;
            } else
            if(c == '>')
            {
                buf.insert(i, "&gt");
                buf.setCharAt(i + 3, ';');
                i += 4;
            } else
            if(c == '"')
            {
                buf.insert(i, "&quot");
                buf.setCharAt(i + 5, ';');
                i += 6;
            } else
            {
                i++;
            }
        }

        return buf.toString();
    }
}