java防SQL注入,最简单的办法是杜绝SQL拼接,SQL注入攻击能得逞是因为在原有SQL语句中加入了新的逻辑，如果使用PreparedStatement来代替Statement来执行SQL语句，其后只是输入参数，SQL注入攻击手段将无效，这是因为PreparedStatement不允许在不同的插入时间改变查询的逻辑结构 ,大部分的SQL注入已经挡住了, 在WEB层我们可以过滤用户的输入来防止SQL注入比如用Filter来过滤全局的表单参数 01 import java.io.IOException; 02 import java.util.Iterator; 03 import javax.servlet.Filter; 04 import javax.servlet.FilterChain; 05 import javax.servlet.FilterConfig; 06 import javax.servlet.ServletException; 07 import javax.servlet.ServletRequest; 08 import javax.servlet.ServletResponse; 09 import javax.servlet.http.HttpServletRequest; 10 import javax.servlet.http.HttpServletResponse; 11 /** 12 * 通过Filter过滤器来防SQL注入攻击 13 * www.2cto.com 14 */ 15 public class SQLFilter implements Filter { 16 private String inj_str = "'|and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare|; |or|-|+|,"; 17 protected FilterConfig filterConfig = null; 18 /** 19 * Should a character encoding specified by the client be ignored? 20 */ 21 protected boolean ignore = true; 22 public void init(FilterConfig config) throws ServletException { 23 this.filterConfig = config; 24 this.inj_str = filterConfig.getInitParameter("keywords"); 25 } 26 public void doFilter(ServletRequest request, ServletResponse response, 27 FilterChain chain) throws IOException, ServletException { 28 HttpServletRequest req = (HttpServletRequest)request; 29 HttpServletResponse res = (HttpServletResponse)response; 30 Iterator values = req.getParameterMap().values().iterator();//获取所有的表单参数 31 while(values.hasNext()){ 32 String[] value = (String[])values.next(); 33 for(int i = 0;i < value.length;i++){ 34 if(sql_inj(value[i])){ 35 //TODO这里发现sql注入代码的业务逻辑代码 36 return; 37 } 38 } 39 } 40 chain.doFilter(request, response); 41 } 42 public boolean sql_inj(String str) 43 { 44 String[] inj_stra=inj_str.split("\\|"); 45 for (int i=0 ; i < inj_stra.length ; i++ ) 46 { 47 if (str.indexOf(" "+inj_stra[i]+" ")>=0) 48 { 49 return true; 50 } 51 } 52 return false; 53 } 54 } 也可以单独在需要防范SQL注入的 Java Bean的字段上过滤： 1 /** 2 * 防止sql注入 3 * 4 * @param sql 5 * @return 6 */ 7 public static String TransactSQLInjection(String sql) { 8 return sql.replaceAll(".*([';]+|(--)+).*", " "); 9 } 作者 helloklzs
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