SpringSecurity中自定义过滤器的种类

配置文件中的...都是采用的auto-config="true"这种自动配置模式，根据Spring Security文档的说明:
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auto-config Automatically registers a login form, BASIC authentication, logout services. If set to "true", all of these capabilities are added (although you can still customize the configuration of each by providing the respective element).
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可以理解为:

package com.cnblogs.yjmyzz;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//import org.springframework.security.authentication.AuthenticationServiceException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

public class CustomLoginFilter extends UsernamePasswordAuthenticationFilter {

    public Authentication attemptAuthentication(HttpServletRequest request,
            HttpServletResponse response) throws AuthenticationException {

        // if (!request.getMethod().equals("POST")) {
        // throw new AuthenticationServiceException(
        // "Authentication method not supported: "
        // + request.getMethod());
        // }

        String username = obtainUsername(request).toUpperCase().trim();
        String password = obtainPassword(request);

        UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(
                username, password);

        setDetails(request, authRequest);
        return this.getAuthenticationManager().authenticate(authRequest);
    }

}

即：从UsernamePasswordAuthenticationFilter继承一个类，然后把关于POST方式判断的代码注释掉即可。默认情况下，Spring Security的用户名是区分大小写，如果觉得没必要，上面的代码同时还演示了如何在Filter中自动将其转换成大写。

本文出自：

http://www.cnblogs.com/yjmyzz/p/3888507.html