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
