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SpringSecurity 表单登录的实现

2021-12-17 10:53:25 作者：周杰伦本人

本文主要介绍了SpringSecurity 表单登录的实现，文中通过示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

表单登录

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .loginPage("/mylogin.html")
                .loginProcessingUrl("/doLogin")
                .defaultSuccessUrl("/index.html")
                .failureHandler(new MyAuthenticationFailureHandler())
                .usernameParameter("uname")
                .passwordParameter("passwd")
                .permitAll()
                .and()
                .logout()
                .logoutRequestMatcher(new OrRequestMatcher(
                        new AntPathRequestMatcher("/logout1", "GET"),
                        new AntPathRequestMatcher("/logout2", "POST")))
                .invalidateHttpSession(true)
                .clearAuthentication(true)
                .defaultLogoutSuccessHandlerFor((req,resp,auth)->{
                    resp.setContentType("application/json;charset=utf-8");
                    Map<String, Object> result = new HashMap<>();
                    result.put("status", 200);
                    result.put("msg", "使用 logout1 注销成功!");
                    ObjectMapper om = new ObjectMapper();
                    String s = om.writeValueAsString(result);
                    resp.getWriter().write(s);
                },new AntPathRequestMatcher("/logout1","GET"))
                .defaultLogoutSuccessHandlerFor((req,resp,auth)->{
                    resp.setContentType("application/json;charset=utf-8");
                    Map<String, Object> result = new HashMap<>();
                    result.put("status", 200);
                    result.put("msg", "使用 logout2 注销成功!");
                    ObjectMapper om = new ObjectMapper();
                    String s = om.writeValueAsString(result);
                    resp.getWriter().write(s);
                },new AntPathRequestMatcher("/logout2","POST"))
                .and()
                .csrf().disable();
    }
}

springSecurity需要自定义配置值基本都是继承WebSecurityConfigurerAdapter

authorizeRequests表示开启权限配置，.anyRequest().authenticated()表示所有的请求都认证之后才能访问
and()方法返回HttpSecurity的实例
formLogin()表示开启表单登录配置
- loginPage 配置登录页面地址
- loginProcessingUrl 配置登录接口地址
- defaultSuccessUrl 登录成功后的跳转地址
- failureUrl表示登录失败后的跳转地址
- usernameParameter表示登录用户名的参数名
- passwordParameter 登录mima的参数名
- permitAll()表示和登录相关的页面和接口不做拦截直接通过

其中loginProcessingUrl usernameParameter passwordParameter要和登录表单的配置一致。

 .loginPage("/mylogin.html")  // 
                .loginProcessingUrl("/doLogin")
                .defaultSuccessUrl("/index.html")
                .failureHandler(new MyAuthenticationFailureHandler())
                .usernameParameter("uname")
                .passwordParameter("passwd")

csrf().disable()表示禁用CSRF防御功能

登录成功

用户登录成功后除了defaultSuccessUrl方法可以实现登录成功的跳转之外，successForwardUrl也可以实现登录成功后的跳转，

defaultSuccessUrl 和successForwardUrl区别：

defaultSuccessUrl表示当用户登录成功后，会自动重定向到登录之前的地址，如果用户本身就是访问的登录页面，登录成功后就会重定向到defaultSuccessUrl指定页面
successForwardUrl不会考虑用户之前的访问地址，登录成功后通过服务器端跳转到successForwardUrl所指定的页面。

defaultSuccessUrl是客户端跳转重定向，successForwardUrl是通过服务端实现的跳转。

他们的接口都AuthenticationSuccessHandler

AuthenticationSuccessHandler有三个实现类

SimpleUrlAuthenticationSuccessHandler 继承 AbstractAuthenticationTargetUrlRequestHandler 通过他的handle方法处理请求

SavedRequestAwareAuthenticationSuccessHandler 在SimpleUrlAuthenticationSuccessHandler基础上增加了请求加缓存的功能，可以记录之前请求的地址，今儿在登录成功后重定向到开始访问的地址。
ForwardAuthenticationSuccessHandler 是服务端的跳转

SavedRequestAwareAuthenticationSuccessHandler

defaultSuccessUrl 对应的是SavedRequestAwareAuthenticationSuccessHandler

public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws ServletException, IOException {
    SavedRequest savedRequest = this.requestCache.getRequest(request, response);
    if (savedRequest == null) {
        super.onAuthenticationSuccess(request, response, authentication);
    } else {
        String targetUrlParameter = this.getTargetUrlParameter();
        if (!this.isAlwaysUseDefaultTargetUrl() && (targetUrlParameter == null || !StringUtils.hasText(request.getParameter(targetUrlParameter)))) {
            this.clearAuthenticationAttributes(request);
            String targetUrl = savedRequest.getRedirectUrl();
            this.logger.debug("Redirecting to DefaultSavedRequest Url: " + targetUrl);
            this.getRedirectStrategy().sendRedirect(request, response, targetUrl);
        } else {
            this.requestCache.removeRequest(request, response);
            super.onAuthenticationSuccess(request, response, authentication);
        }
    }
}

首先从requestCache中获取缓存下来的请求如果没有获取到缓存请求,就说明用户在访问登录页面之前并没有访问其他页面，此时直接调用父类的onAuthenticationSuccess方法来处理，重定向到defaultSuccessUrl指定的地址。
获取targetUrlParameter 拿到target参数后重定向地址。
如果targetUrlParameter不存在或者alwaysUseDefaultTargetUrl为true 缓存下来的请求没有意义，直接调用父类的onAuthenticationSuccess方法完成重定向。targetUrlParameter存在则重定向到targetUrlParameter中，alwaysUseDefaultTargetUrl为true 走默认

ForwardAuthenticationSuccessHandler

successForwardUrl对应ForwardAuthenticationSuccessHandler

public class ForwardAuthenticationSuccessHandler implements AuthenticationSuccessHandler {
    private final String forwardUrl;

    public ForwardAuthenticationSuccessHandler(String forwardUrl) {
        Assert.isTrue(UrlUtils.isValidRedirectUrl(forwardUrl), () -> {
            return "'" + forwardUrl + "' is not a valid forward URL";
        });
        this.forwardUrl = forwardUrl;
    }

    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
        request.getRequestDispatcher(this.forwardUrl).forward(request, response);
    }
}

主要调用getRequestDispatcher进行服务端请求转发

自定义AuthenticationSuccessHandler 实现类

public class MyAuthenticationSuccessHandler implements AuthenticationSuccessHandler{
    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
        response.setContentType("application/json;charset=utf-8");
        Map<String, Object> resp = new HashMap<>();
        resp.put("status", 200);
        resp.put("msg", "登录成功!");
        ObjectMapper om = new ObjectMapper();
        String s = om.writeValueAsString(resp);
        response.getWriter().write(s);
    }
}

.successHandler(new MyAuthenticationSuccessHandler())

通过HttpServletResponse对象返回登录成功的json给前端

登录失败

failureUrl表示登录失败后的重定向到配置的页面，重定向是客户端的跳转，不方便携带请求失败的异常信息。

failureForwardUrl是服务端的跳转，可以携带登录异常信息。登录失败，自动跳转回登录页面，将错误信息展示出来。

他们的配置的是AuthenticationFailureHandler接口的实现类

SimpleUrlAuthenticationFailureHandler

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

package org.springframework.security.web.authentication;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.http.HttpStatus;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.DefaultRedirectStrategy;
import org.springframework.security.web.RedirectStrategy;
import org.springframework.security.web.util.UrlUtils;
import org.springframework.util.Assert;

public class SimpleUrlAuthenticationFailureHandler implements AuthenticationFailureHandler {
    protected final Log logger = LogFactory.getLog(this.getClass());
    private String defaultFailureUrl;
    private boolean forwardToDestination = false;
    private boolean allowSessionCreation = true;
    private RedirectStrategy redirectStrategy = new DefaultRedirectStrategy();

    public SimpleUrlAuthenticationFailureHandler() {
    }

    public SimpleUrlAuthenticationFailureHandler(String defaultFailureUrl) {
        this.setDefaultFailureUrl(defaultFailureUrl);
    }

    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) throws IOException, ServletException {
        if (this.defaultFailureUrl == null) {
            this.logger.debug("No failure URL set, sending 401 Unauthorized error");
            response.sendError(HttpStatus.UNAUTHORIZED.value(), HttpStatus.UNAUTHORIZED.getReasonPhrase());
        } else {
            this.saveException(request, exception);
            if (this.forwardToDestination) {
                this.logger.debug("Forwarding to " + this.defaultFailureUrl);
                request.getRequestDispatcher(this.defaultFailureUrl).forward(request, response);
            } else {
                this.logger.debug("Redirecting to " + this.defaultFailureUrl);
                this.redirectStrategy.sendRedirect(request, response, this.defaultFailureUrl);
            }
        }

    }

    protected final void saveException(HttpServletRequest request, AuthenticationException exception) {
        if (this.forwardToDestination) {
            request.setAttribute("SPRING_SECURITY_LAST_EXCEPTION", exception);
        } else {
            HttpSession session = request.getSession(false);
            if (session != null || this.allowSessionCreation) {
                request.getSession().setAttribute("SPRING_SECURITY_LAST_EXCEPTION", exception);
            }
        }

    }
}

当用户构造SimpleUrlAuthenticationFailureHandler对象时候传入defaultFailureUrl，也就是登录失败时要跳转的url。在onAuthenticationFailure方法中

如果defaultFailureUrl为null，直接通过response返回异常信息，否则调用saveException
saveException 如果forwardToDestination为true，表示通过服务器端跳转回到登录页面，此时就把异常信息放到request中。
回到onAuthenticationFailure方法，如果forwardToDestination为true，就通过服务器端跳回到登录页面，否则重定向到登录页面。

自定义AuthenticationFailureHandler实现类

public class MyAuthenticationFailureHandler implements AuthenticationFailureHandler {
    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response, AuthenticationException exception) throws IOException, ServletException {
        response.setContentType("application/json;charset=utf-8");
        Map<String, Object> resp = new HashMap<>();
        resp.put("status", 500);
        resp.put("msg", "登录失败!" + exception.getMessage());
        ObjectMapper om = new ObjectMapper();
        String s = om.writeValueAsString(resp);
        response.getWriter().write(s);
    }
}

通过HttpServletResponse对象返回登录失败的json给前端

注销登录

.logout()
.logoutUrl("")
.logoutRequestMatcher(new OrRequestMatcher(
        new AntPathRequestMatcher("/logout1", "GET"),
        new AntPathRequestMatcher("/logout2", "POST")))
.invalidateHttpSession(true)
.clearAuthentication(true)
.logoutSuccessUrl("")

logout() 表示开启注销登录配置。
logoutUrl 指定注销登录请求地址，默认GET请求，路径logout
invalidateHttpSession 表示是否使session失效，默认为true
clearAuthentication 表示是否清除认证信息，默认为true
logoutSuccessUrl 表示注销登录后的跳转地址。
logoutRequestMatcher 匹配多个注销登录

自定义注销成功的返回内容

.logout()
.logoutRequestMatcher(new OrRequestMatcher(
        new AntPathRequestMatcher("/logout1", "GET"),
        new AntPathRequestMatcher("/logout2", "POST")))
.invalidateHttpSession(true)
.clearAuthentication(true)
.defaultLogoutSuccessHandlerFor((req,resp,auth)->{
    resp.setContentType("application/json;charset=utf-8");
    Map<String, Object> result = new HashMap<>();
    result.put("status", 200);
    result.put("msg", "使用 logout1 注销成功!");
    ObjectMapper om = new ObjectMapper();
    String s = om.writeValueAsString(result);
    resp.getWriter().write(s);
},new AntPathRequestMatcher("/logout1","GET"))
.defaultLogoutSuccessHandlerFor((req,resp,auth)->{
    resp.setContentType("application/json;charset=utf-8");
    Map<String, Object> result = new HashMap<>();
    result.put("status", 200);
    result.put("msg", "使用 logout2 注销成功!");
    ObjectMapper om = new ObjectMapper();
    String s = om.writeValueAsString(result);
    resp.getWriter().write(s);
},new AntPathRequestMatcher("/logout2","POST"))
.and()
.csrf().disable();

defaultLogoutSuccessHandlerFor()两个参数第一个是注销成功的回调，第二个是具体的注销请求。

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