SpringSecurity自定义UsernamePasswordAuthenticationFilter（转载）

UsernamePasswordAuthenticationFilter介绍

这里我的需求是通过自定义UsernamePasswordAuthenticationFilter实现对前端传过来的密码进行RSA私钥解密，并且因为登录地址不是"/login"，所以继承的是AbstractAuthenticationProcessingFilter，如果登录地址为默认，那么可直接继承UsernamePasswordAuthenticationFilter重写attemptAuthentication方法即可。

public class MyUsernamePasswordAuthenticationFilter extends AbstractAuthenticationProcessingFilter {
    public static final String SPRING_SECURITY_FORM_USERNAME_KEY = "username";
    public static final String SPRING_SECURITY_FORM_PASSWORD_KEY = "password";
    private String usernameParameter = SPRING_SECURITY_FORM_USERNAME_KEY;
    private String passwordParameter = SPRING_SECURITY_FORM_PASSWORD_KEY;
    private boolean postOnly = true;
    private String privateKey = "xxxxxxxxxxxxxxxxxxx";
    
    public MyUsernamePasswordAuthenticationFilter() {
        super(new AntPathRequestMatcher("/oauth/token", "POST"));
    }

    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
            throws AuthenticationException {
        if (postOnly && !request.getMethod().equals("POST")) {
            throw new AuthenticationServiceException("Authentication method not supported: " + request.getMethod());
        }
        String username = obtainUsername(request);
        String password = obtainPassword(request);
        try {
            password = RSAUtil.decrypt(password, privateKey);
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (username == null) {
            username = "";
        }
        
        if (password == null) {
            password = "";
        }

        username = username.trim();

        UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(username, password);

        // Allow subclasses to set the "details" property
        setDetails(request, authRequest);

        return super.getAuthenticationManager().authenticate(authRequest);
    }

    public void setAuthenticationManager(AuthenticationManager authenticationManager) {
        super.setAuthenticationManager(authenticationManager);
    }
    
    protected String obtainPassword(HttpServletRequest request) {
        return request.getParameter(passwordParameter).replaceAll(" ", "+");
    }

    protected String obtainUsername(HttpServletRequest request) {
        return request.getParameter(usernameParameter);
    }

    protected void setDetails(HttpServletRequest request,
            UsernamePasswordAuthenticationToken authRequest) {
        authRequest.setDetails(authenticationDetailsSource.buildDetails(request));
    }

    public void setUsernameParameter(String usernameParameter) {
        Assert.hasText(usernameParameter, "Username parameter must not be empty or null");
        this.usernameParameter = usernameParameter;
    }

    public void setPasswordParameter(String passwordParameter) {
        Assert.hasText(passwordParameter, "Password parameter must not be empty or null");
        this.passwordParameter = passwordParameter;
    }
    
    public void setPostOnly(boolean postOnly) {
        this.postOnly = postOnly;
    }

    public final String getUsernameParameter() {
        return usernameParameter;
    }

    public final String getPasswordParameter() {
        return passwordParameter;
    }

}

把自定义 MyUsernamePasswordAuthenticationFilter 添加到 Filter Chain 过滤器链中

除了上面的例子，还常用于修改表单登录变为使用Json格式登录,登录验证码等等，需要注意的地方是UsernamePasswordAuthenticationFilter的默认登录地址为

 转载自：https://www.cnblogs.com/dang-/p/11535940.html