java防止sql注入

http://my.oschina.net/u/1031131/blog/410423

public final static String filterSQLInjection(String s) { 
    if (s == null || "".equals(s)) { 
        return ""; 
    } 
    try { 
        s = s.trim().replaceAll("</?[s,S][c,C][r,R][i,I][p,P][t,T]>?", "");//script 
        s = s.trim().replaceAll("[a,A][l,L][e,E][r,R][t,T]\\(", "").replace("\"", "");// alert 
        s = s.trim().replace("\\.swf", "").replaceAll("\\.htc", ""); 
        s = s.trim().replace("\\.php\\b", "").replaceAll("\\.asp\\b", ""); 
        s = s.trim().replace("document\\.", "").replaceAll("[e,E][v,V][a,A][l,L]\\(", ""); 
        s = s.trim().replaceAll("'", "").replaceAll(">", ""); 
        s = s.trim().replaceAll("<", "").replaceAll("=", ""); 
        s = s.trim().replaceAll(" [o,O][r,R]", ""); 
        s = s.trim().replaceAll("etc/", "").replaceAll("cat ", ""); 
        s = s.trim().replaceAll("/passwd ", ""); 
        s = s.trim().replaceAll("sleep\\(", "").replaceAll("limit ", "").replaceAll("LIMIT ", ""); 
        s = s.trim().replaceAll("[d,D][e,E][l,L][e,E][t,T][e,E] ", "");// delete 
        s = s.trim().replaceAll("[s,S][e,E][l,L][e,E][c,C][t,T] ", "");// select; 
        s = s.trim().replaceAll("[u,U][p,P][d,D][a,A][t,T][e,E] ", "");// update 
        s = s.trim().replaceAll("[d,D][e,E][l,L][a,A][y,Y] ", "").replaceAll("waitfor ", ""); 
        s = s.trim().replaceAll("print\\(", "").replaceAll("md5\\(", ""); 
        s = s.trim().replaceAll("cookie\\(", "").replaceAll("send\\(", ""); 
        s = s.trim().replaceAll("response\\.", "").replaceAll("write\\(", "") 
                .replaceAll("&", ""); 
    } catch (Exception e) { 
        e.printStackTrace(); 
        return ""; 
    } 
    return s; 
}