WEB开发必备的几个转换函数（Java）

以前用java做WEB开发编写的转换代码，希望对大家有所帮助。

主要包括如下函数：

1. escapeJSValue： 转换为可以对Javascript变量赋值的文本
2. escapeFormValue：转换成可以对表单元素的value赋值的字符串
3. escapeHtmlValue：转换成HTML中显示的文本
4. escapeTextAreaValue：转换成textarea中的文本

    //Javascript字符串转换，转换成Javascript中的字符串，用于对JS变量赋值
    public static String escapeJSValue(String src)
    {
        if (src == null)
        {
            return null;
        }

        String szResult;

        szResult = src;

        szResult = szResult.replaceAll("", "");
        szResult = szResult.replaceAll("", "");
        szResult = szResult.replaceAll("", "");
        szResult = szResult.replaceAll("'", "");
        szResult = szResult.replaceAll("<", "");
        szResult = szResult.replaceAll("\"", """);

        return szResult;
    }

    //转换成HTML中可以对value赋值的字符串，用于对form中的元素赋值
    public static String escapeFormValue(String src)
    {
        if (src == null)
        {
            return null;
        }

        int len = src.length();
        StringBuffer sbResult = new StringBuffer(len);
        char ch;

        try
        {
            for (int i=0; i            {
                ch = src.charAt(i);
                switch(ch)
                {
                    case '\"':
                        sbResult.append(""");
                        break;
                    case '&':
                        sbResult.append("&");
                        break;
                    case '>':
                        sbResult.append(">");
                        break;
                    case '<':
                        sbResult.append("<");
                        break;
                    case '\n':
                        sbResult.append(" ");
                        break;
                    case '\r':
                        sbResult.append(" ");
                        break;
                    default:
                        sbResult.append(ch);
                    break;
                }
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }

        return sbResult.toString();
    }

   //转换成HTML中显示的文字
    public static String escapeHtmlValue(String src)
    {
        if (src == null)
        {
            return null;
        }

        int len = src.length();
        StringBuffer sbResult = new StringBuffer(len);
        char ch;
        boolean bPreviousIsSpace = false;

        try
        {
            for (int i=0; i            {
                ch = src.charAt(i);
                switch(ch)
                {
                    case '&':
                        sbResult.append("&");
                        bPreviousIsSpace = false;
                        break;
                    case '>':
                        sbResult.append(">");
                        bPreviousIsSpace = false;
                        break;
                    case '<':
                        sbResult.append("<");
                        bPreviousIsSpace = false;
                        break;
                    case ' ':
                        if (!bPreviousIsSpace)
                        {
                            sbResult.append(ch);
                            bPreviousIsSpace = true;
                        }
                        else
                        {
                            sbResult.append(" ");
                        }
                        break;
                    default:
                        sbResult.append(ch);
                    bPreviousIsSpace = false;
                    break;
                }
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }

        return sbResult.toString();
    }

    public static String escapeHtmlValue2(String src)
    {
        if (src == null)
        {
            return null;
        }

        String szResult = escapeHtmlValue(src);
        szResult = szResult.replaceAll("", "
");
        szResult = szResult.replaceAll("", "
");
        return szResult.replaceAll("", "    ");
    }

    //转换成Textarea中的文字
    public static String escapeTextAreaValue(String src)
    {
        if (src == null)
        {
            return null;
        }

        int len = src.length();
        StringBuffer sbResult = new StringBuffer(len);
        char ch;

        try
        {
        for (int i=0; i        {
            ch = src.charAt(i);
            switch(ch)
            {
                case '&':
                    sbResult.append("&");
                    break;
                case '>':
                    sbResult.append(">");
                    break;
                case '<':
                    sbResult.append("<");
                    break;
                default:
                    sbResult.append(ch);
                    break;
            }
        }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }

        return sbResult.toString();
    }