java防止sql注入

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(".phpb","").replaceAll(".aspb","");
        s = s.trim().replace("document.","").replaceAll("[e,E][v,V][a,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,E][t,T][e,E] ","");// delete
        s = s.trim().replaceAll("[s,S][e,E][c,C][t,T] ","");// select;
        s = s.trim().replaceAll("[u,U][p,P][d,D][a,A][t,"");// update
        s = s.trim().replaceAll("[d,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;
}