C++ 栈和堆的区别和作用，以及内存分配

首先在web.xml中配置

<!-- 防sql注入过滤器 -->
<filter>
<filter-name>antiSqlInjection</filter-name>
<filter-class>com.usermanage.util.AntiSqlInjectionfilter</filter-class>
</filter>
<filter-mapping>
<filter-name>antiSqlInjection</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
2.具体逻辑实现
package com.usermanage.util;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AntiSqlInjectionfilter implements Filter {

@Override
public void destroy() {

}

@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req=(HttpServletRequest)arg0;
HttpServletResponse res=(HttpServletResponse)arg1;
//获得所有请求参数名
Enumeration params = req.getParameterNames();
String sql = "";
while (params.hasMoreElements()) {
//得到参数名
String name = params.nextElement().toString();
System.out.println("name===========================" + name + "--");
//得到参数对应值
String[] value = req.getParameterValues(name);
for (int i = 0; i < value.length; i++) {
sql = sql + value[i];
}
}
System.out.println("============================SQL"+sql);
//有sql关键字，跳转到error.html
if (sqlValidate(sql)) {
res.setContentType("text/html;charset=utf-8");
res.getWriter().print("请不要尝试sql注入<br><a href='javascript:;' onclick='history.go(-1)'>返回</a>");
// throw new IOException("您发送请求中的参数中含有非法字符");
//String ip = req.getRemoteAddr();
} else {
chain.doFilter(arg0,arg1);
}
}
//效验
protected static boolean sqlValidate(String str) {
str = str.toLowerCase();//统一转为小写
String badStr = "'|and|exec|execute|insert|select|delete|update|count|drop|*|%|chr|mid|master|truncate|" +
"char|declare|sitename|net user|xp_cmdshell|;|or|+|,|like'|and|exec|execute|insert|create|drop|" +
"table|from|grant|use|group_concat|column_name|" +
"information_schema.columns|table_schema|union|where|select|delete|update|order|by|count|*|" +
"chr|mid|master|truncate|char|declare|or|;|--|+|,|like|//|/|%|#";//过滤掉的sql关键字，可以手动添加
String[] badStrs = badStr.split("\\|");
for (int i = 0; i < badStrs.length; i++) {
if (str.indexOf(badStrs[i]) >= 0) {
return true;
}
}
return false;
}

@Override
public void init(FilterConfig arg0) throws ServletException {

}

}