Java过滤器验证登录用户
1.首先写一个权限过滤filter类,实现Filter接口
/*首先写一个权限过滤filter*/
import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
public class RightFilter
implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
HttpSession session = req.getSession(true);
String path = req.getRequestURI();
//从session里取的用户名信息
String username = (String) session.getAttribute("username");
for (int i = 0; i < Constants.NoFilter_Pages.length; i++) {
if (path.indexOf(Constants.NoFilter_Pages[i]) > -1) {
chain.doFilter(req, res);
return;
}
}
//判断如果没有取到用户信息,就跳转到登陆页面
if (username == null || "".equals(username)) {
//跳转到登陆页面
res.sendRedirect(" http://"+req.getHeader("Host")+"/login.jsp ");//这里是返回域名的根目录地址，若直接返回当前的目录下的文件，则用res.sendRedirect("/login.jsp")
}
else {
//已经登陆,继续�
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1.出品
Jsmooth,Sourceforge.net
2. 类型
free
3. 下载
http://jsmooth.sourceforge.net/download.php
4. 步骤
a)利用Eclipse将所需要的主类打成可独立运行的jar包，注意添加manifest属性和MainClass。
b)新建一个Jsmooth工程
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import java.util.regex.*;
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{
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* 验证邮箱
* @param 待验证的字符串
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1. MD5加密，常用于加密用户名密码，当用户验证时。
protected byte[] encrypt(byte[] obj) ...{
try ...{
MessageDigest md5 = MessageDigest.getInstance("MD5");
md5.update(obj);
return md5.digest();
} catch (NoSuchAlgorithmException e) ...{
e.printStackTrace();
� ......
