在使用springsecurity中，大伙都知道默认的登录数据是通过key/value的形式来传递的，默认情况下不支持json格式的登录数据，如果有这种需求，就需要自己来解决，本文主要和小伙伴来聊聊这个话题。
基本登录方案
在说如何使用json登录之前，我们还是先来看看基本的登录吧，本文为了简单，springsecurity在使用中就不连接数据库了，直接在内存中配置用户名和密码，具体操作步骤如下：
创建spring boot工程
首先创建springboot工程，添加springsecurity依赖，如下：
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<dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-security</artifactid></dependency><dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid></dependency> |
添加security配置
创建securityconfig，完成springsecurity的配置，如下：
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@configurationpublic class securityconfig extends websecurityconfigureradapter { @bean passwordencoder passwordencoder() { return new bcryptpasswordencoder(); } @override protected void configure(authenticationmanagerbuilder auth) throws exception { auth.inmemoryauthentication().withuser("zhangsan").password("$2a$10$2o4ewlrrfpebotfdotc0f.rpumk.3q3kvbhrx7xxkumlbgjoobs8q").roles("user"); } @override public void configure(websecurity web) throws exception { } @override protected void configure(httpsecurity http) throws exception { http.authorizerequests() .anyrequest().authenticated() .and() .formlogin() .loginprocessingurl("/dologin") .successhandler(new authenticationsuccesshandler() { @override public void onauthenticationsuccess(httpservletrequest req, httpservletresponse resp, authentication authentication) throws ioexception, servletexception { respbean ok = respbean.ok("登录成功！",authentication.getprincipal()); resp.setcontenttype("application/json;charset=utf-8"); printwriter out = resp.getwriter(); out.write(new objectmapper().writevalueasstring(ok)); out.flush(); out.close(); } }) .failurehandler(new authenticationfailurehandler() { @override public void onauthenticationfailure(httpservletrequest req, httpservletresponse resp, authenticationexception e) throws ioexception, servletexception { respbean error = respbean.error("登录失败"); resp.setcontenttype("application/json;charset=utf-8"); printwriter out = resp.getwriter(); out.write(new objectmapper().writevalueasstring(error)); out.flush(); out.close(); } }) .loginpage("/login") .permitall() .and() .logout() .logouturl("/logout") .logoutsuccesshandler(new logoutsuccesshandler() { @override public void onlogoutsuccess(httpservletrequest req, httpservletresponse resp, authentication authentication) throws ioexception, servletexception { respbean ok = respbean.ok("注销成功！"); resp.setcontenttype("application/json;charset=utf-8"); printwriter out = resp.getwriter(); out.write(new objectmapper().writevalueasstring(ok)); out.flush(); out.close(); } }) .permitall() .and() .csrf() .disable() .exceptionhandling() .accessdeniedhandler(new accessdeniedhandler() { @override public void handle(httpservletrequest req, httpservletresponse resp, accessdeniedexception e) throws ioexception, servletexception { respbean error = respbean.error("权限不足，访问失败"); resp.setstatus(403); resp.setcontenttype("application/json;charset=utf-8"); printwriter out = resp.getwriter(); out.write(new objectmapper().writevalueasstring(error)); out.flush(); out.close(); } }); }} |
这里的配置虽然有点长，但是很基础，配置含义也比较清晰，首先提供bcryptpasswordencoder作为passwordencoder，可以实现对密码的自动加密加盐，非常方便，然后提供了一个名为zhangsan的用户，密码是123，角色是user，最后配置登录逻辑，所有的请求都需要登录后才能访问，登录接口是/dologin，用户名的key是username，密码的key是password，同时配置登录成功、登录失败以及注销成功、权限不足时都给用户返回json提示，另外，这里虽然配置了登录页面为/login，实际上这不是一个页面，而是一段json，在logincontroller中提供该接口，如下：
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@restcontroller@responsebodypublic class logincontroller { @getmapping("/login") public respbean login() { return respbean.error("尚未登录，请登录"); } @getmapping("/hello") public string hello() { return "hello"; }} |
这里/login只是一个json提示，而不是页面， /hello则是一个测试接口。
ok，做完上述步骤就可以开始测试了，运行springboot项目，访问/hello接口，结果如下：
此时先调用登录接口进行登录，如下：
登录成功后，再去访问/hello接口就可以成功访问了。
使用json登录
上面演示的是一种原始的登录方案，如果想将用户名密码通过json的方式进行传递，则需要自定义相关过滤器，通过分析源码我们发现，默认的用户名密码提取在usernamepasswordauthenticationfilter过滤器中，部分源码如下：
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public class usernamepasswordauthenticationfilter 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; public usernamepasswordauthenticationfilter() { super(new antpathrequestmatcher("/login", "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); 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 this.getauthenticationmanager().authenticate(authrequest); } protected string obtainpassword(httpservletrequest request) { return request.getparameter(passwordparameter); } protected string obtainusername(httpservletrequest request) { return request.getparameter(usernameparameter); } //... //...} |
从这里可以看到，默认的用户名/密码提取就是通过request中的getparameter来提取的，如果想使用json传递用户名密码，只需要将这个过滤器替换掉即可，自定义过滤器如下：
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public class customauthenticationfilter extends usernamepasswordauthenticationfilter { @override public authentication attemptauthentication(httpservletrequest request, httpservletresponse response) throws authenticationexception { if (request.getcontenttype().equals(mediatype.application_json_utf8_value) || request.getcontenttype().equals(mediatype.application_json_value)) { objectmapper mapper = new objectmapper(); usernamepasswordauthenticationtoken authrequest = null; try (inputstream is = request.getinputstream()) { map<string,string> authenticationbean = mapper.readvalue(is, map.class); authrequest = new usernamepasswordauthenticationtoken( authenticationbean.get("username"), authenticationbean.get("password")); } catch (ioexception e) { e.printstacktrace(); authrequest = new usernamepasswordauthenticationtoken( "", ""); } finally { setdetails(request, authrequest); return this.getauthenticationmanager().authenticate(authrequest); } } else { return super.attemptauthentication(request, response); } }} |
这里只是将用户名/密码的获取方案重新修正下，改为了从json中获取用户名密码，然后在securityconfig中作出如下修改：
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@overrideprotected void configure(httpsecurity http) throws exception { http.authorizerequests().anyrequest().authenticated() .and() .formlogin() .and().csrf().disable(); http.addfilterat(customauthenticationfilter(), usernamepasswordauthenticationfilter.class);}@beancustomauthenticationfilter customauthenticationfilter() throws exception { customauthenticationfilter filter = new customauthenticationfilter(); filter.setauthenticationsuccesshandler(new authenticationsuccesshandler() { @override public void onauthenticationsuccess(httpservletrequest req, httpservletresponse resp, authentication authentication) throws ioexception, servletexception { resp.setcontenttype("application/json;charset=utf-8"); printwriter out = resp.getwriter(); respbean respbean = respbean.ok("登录成功!"); out.write(new objectmapper().writevalueasstring(respbean)); out.flush(); out.close(); } }); filter.setauthenticationfailurehandler(new authenticationfailurehandler() { @override public void onauthenticationfailure(httpservletrequest req, httpservletresponse resp, authenticationexception e) throws ioexception, servletexception { resp.setcontenttype("application/json;charset=utf-8"); printwriter out = resp.getwriter(); respbean respbean = respbean.error("登录失败!"); out.write(new objectmapper().writevalueasstring(respbean)); out.flush(); out.close(); } }); filter.setauthenticationmanager(authenticationmanagerbean()); return filter;} |
将自定义的customauthenticationfilter类加入进来即可，接下来就可以使用json进行登录了，如下：
好了，本文就先介绍到这里，有问题欢迎留言讨论。 希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://segmentfault.com/a/1190000018157525
