**
1、編寫過濾器類—SqlFilter.java
**
package com.yl.zp.controller;
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;
import org.springframework.stereotype.Component;
@Component
public class SqlFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO 自動生成的方法存根
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
//獲得所有請求參數名
Enumeration params = req.getParameterNames();
String sql = "";
while (params.hasMoreElements()) {
//得到參數名
String name = params.nextElement().toString();
//System.out.println("name===========================" + name + "--");
//得到參數對應值
String[] value = req.getParameterValues(name);
for (int i = 0; i < value.length; i++) {
sql = sql + value[i];
}
}
System.out.println("被匹配字符串:"+sql);
if (sqlValidate(sql)) {
//res.sendRedirect("error.jsp");
System.out.println("發現sql注入。。。。。。。");
} else {
chain.doFilter(req, res);
}
}
@Override
public void destroy() {
// TODO 自動生成的方法存根
}
//校驗
protected static boolean sqlValidate(String str) {
str = str.toLowerCase();//統一轉爲小寫
//String badStr = "and|exec";
String badStr = "'|and|exec|execute|insert|select|delete| update|count|drop|chr|mid|master|truncate|char|declare|sitename|net user|xp_cmdshell|or|like|-|--|+|,|like|//|/|%| #";
/*String badStr = "'|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|//|/|%|#"; */ //過濾掉的sql關鍵字,可以手動添加
String[] badStrs = badStr.split("\\|");
for (int i = 0; i < badStrs.length; i++) {
if (str.indexOf(badStrs[i]) !=-1) {
System.out.println("匹配到:"+badStrs[i]);
return true;
}
}
return false;
}
}
**
2、在 web.xml 中配置過濾器
**
<filter>
<filter-name>SqlFilter</filter-name>
<filter-class>com.yl.zp.controller.SqlFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SqlFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
這樣就可以了,這樣的配置會攔截所有的請求,對請求中的參數進行檢驗。
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