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spring如何防止sql注入

小新
1129
2021-01-01 13:58:49
栏目: 云计算

spring如何防止sql注入

spring防止sql注入的方法:

可以通过编写一个webFilter过滤器来防止sql注入,例如:

/**

* sql注入过滤器

*/

@Component

@WebFilter(urlPatterns = "/*", filterName = "SQLInjection", initParams = { @WebInitParam(name = "regx", value = "(?:')|(?:--)|(/\\*(?:.|[\\n\\r])*?\\*/)|" +

"(\\b(select|update|and|or|delete|insert|trancate|char|into|substr|ascii|declare|exec|count|master|into|drop|execute)\\b)") })

public class SqlInjectFilter implements Filter{

  private String regx;

  @Override

  public void init(FilterConfig filterConfig) throws ServletException {

    this.regx = filterConfig.getInitParameter("regx");

  }

  @Override

  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

    HttpServletRequest req = (HttpServletRequest) servletRequest;

    Map parametersMap = servletRequest.getParameterMap();

    Iterator it = parametersMap.entrySet().iterator();

    while (it.hasNext()) {

      Map.Entry entry = (Map.Entry) it.next();

      String[] value = (String[]) entry.getValue();

      for (int i = 0; i < value.length; i++) {

        if (null != value[i] && value[i].matches(this.regx)) {

          log.error("您输入的参数有非法字符,请输入正确的参数!");

          servletRequest.setAttribute("err", "您输入的参数有非法字符,请输入正确的参数!");

          servletRequest.setAttribute("pageUrl",req.getRequestURI());

          servletRequest.getRequestDispatcher(servletRequest.getServletContext().getContextPath() + "/error").forward(servletRequest, servletResponse);

          return;

        }

      }

    }

  }

  filterChain.doFilter(servletRequest, servletResponse);

 }

  @Override

  public void destroy() {

  }

}

在启动类上添加注解:

@ServletComponentScan(basePackages ="xxxx.xxx.xxx.filter") //filter所在的包,扫描

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