[Java知识库]关于CSV文件导入导出进行敏感词过滤问题

1.特殊字符问题
CSV上传文件因为是BOOM表头 所以存在特殊字符/uFEFF 如果用作敏感词过滤 包含特殊字符的内容无法进行过滤
//去除空格
str.replace(" ", “”);
//csv特殊字符处理上传csv
str.replace(“\uFEFF”, “”);

2.导入时乱码问题
判断是否乱码
/**
* 判断字符串是否是乱码
*
* @param strName 字符串
* @return 是否是乱码
/
public static boolean isMessyCode(String strName) {
Pattern p = Pattern.compile(Constant.IS_MESSY_CODE);
Matcher m = p.matcher(strName);
String after = m.replaceAll("");
String temp = after.replaceAll("\p{P}", “”);
char[] ch = temp.trim().toCharArray();
float chLength = ch.length;
float count = 0;
for (int i = 0; i < ch.length; i++) {
char c = ch[i];
if (!Character.isLetterOrDigit?) {
if (!isChinese?) {
count = count + 1;
}
}
}
float result = count / chLength;
if (result > 0.4) {
return true;
} else {
return false;
}
}
/*
* 判断字符是否是中文
*
* @param c 字符
* @return 是否是中文
*/
public static boolean isChinese(char c) {
Character.UnicodeBlock ub = Character.UnicodeBlock.of?;
if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
return true;
}
return false;
}

3.导出时乱码问题
用下面这种方法导出
private final static String CODE_FORMART =“GB2312”;

/**
 * 导出 (流)
 * @param strs
 * @param response
 * @param fileName
 */
public static void write(List<String> strs, HttpServletResponse response, String fileName) {

    response.setContentType("application/csv;charset =" + CODE_FORMART);
    fileName = fileName + Constant.CSV;
    response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
    PrintWriter out = null;
    try {
        out = response.getWriter();
        writeCSV(out,strs);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        out.close();
        out = null;

        if (out != null) {
            out.close();
            out = null;
        }
    }
}

private static void writeCSV(PrintWriter bos,List csvList){
    Iterator it=csvList.iterator();
    while(it.hasNext()){
        bos.println( it.next() );
    }
}

4. 导出时报response.setContentType(“application/msword;charset=GB2312”);错误解决
   返回时不设置返回值即可解决