数据库 user 表

注，密码是由 BCrypt 算法加密对应用户名所得。

root	$2a$10$uzHVooZlCWBkaGScKnpha.ZrK31NI89flKkSuTcKYjdc5ihTPtPyq
blu		$2a$10$mI0TRIcNF4mg34JmH6T1KeystzTWDzWFNL5LQmmlz.fHndcwYHZGe
kaka	$2a$10$/GMSSJ3AzeeBK3rBC4t8BOZ5zkfb38IlwlQl.6mYTEpf22r/cCZ1a
admin	$2a$10$FKf/V.0WdHnTNWHDTtPLJe2gBxTI6TBVyFjloXG9IuH4tjebOTqcS

数据库 role 表

注：role名称必须带上前缀 ROLE_ （SpringSecurity框架要求）

role_user 表

实体类 SysUser

@Data
public class SysUser {
	
	private Integer id;
	private String name;
	private String password;
}

实体类 SysRole

@Data
public class SysRole {
	private Integer id;
	private String name;
}

UserMapper

public interface UserMapper {

	@Select("select * from user where name = #{name}")
	SysUser loadUserByUsername(String name);

}

RoleMapper

public interface RoleMapper {

	@Select("SELECT role.`name` FROM role WHERE role.id in (SELECT role_id FROM "
			+ " role_user as r_s JOIN `user` as u ON r_s.user_id = u.id and u.id = #{id})")
	List findRoleByUserId(int id);
	
}

UserService 接口

该接口需继承UserDetailsService

package com.blu.service;

import org.springframework.security.core.userdetails.UserDetailsService;

public interface UserService extends UserDetailsService {

}

UserServiceImpl 实现类

package com.blu.service.impl;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.blu.entity.SysRole;
import com.blu.entity.SysUser;
import com.blu.mapper.LoginMapper;
import com.blu.mapper.UserMapper;
import com.blu.service.UserService;

@Service
@Transactional
public class UserServiceImpl implements UserService {
	
	@Autowired
	private UserMapper userMapper;
	
	@Autowired
	private RoleMapper roleMapper;

	@Override
	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
		try {
			SysUser sysUser = userMapper.loadUserByUsername(username);
			if(sysUser==null) {
				return null;
			}
			List authorities = new ArrayList<>();
			List list = roleMapper.findRoleByUserId(sysUser.getId());
			for(SysRole role : list) {
				authorities.add(new SimpleGrantedAuthority(role.getName()));
			}
			//封装 SpringSecurity 需要的UserDetails 对象并返回
			UserDetails userDetails = new User(sysUser.getName(),sysUser.getPassword(),authorities);
			return userDetails;
		} catch (Exception e) {
			e.printStackTrace();
			//返回null即表示认证失败
			return null;
		}
	}

}

加密类

@Bean
public BCryptPasswordEncoder bcryptPasswordEncoder(){
	return new BCryptPasswordEncoder();
}

SpringSecurity 配置类

package com.blu.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

import com.blu.service.impl.UserServiceImpl;

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter{
	
	@Autowired
	private UserServiceImpl userServiceImpl;
	@Autowired
	private BCryptPasswordEncoder bcryptPasswordEncoder;
	
	@Override
	protected void configure(HttpSecurity http) throws Exception {
		
		http.authorizeRequests()
			.antMatchers("/").permitAll()
			.antMatchers("/level1/**").hasRole("vip1")
			.antMatchers("/level2/**").hasRole("vip2")
			.antMatchers("/level3/**").hasRole("vip3");
		
		http.formLogin().loginPage("/tologin")
						.usernameParameter("name")
						.passwordParameter("password")
						.loginProcessingUrl("/login");
		http.csrf().disable();
		http.logout().logoutSuccessUrl("/");
		http.rememberMe().rememberMeParameter("remember");
		
	}
	
	@Override
	protected void configure(AuthenticationManagerBuilder auth) throws Exception {
		auth.userDetailsService(userServiceImpl).passwordEncoder(bcryptPasswordEncoder);
	}
	
}

以上方式在认证时是将数据库中查出的用户信息通过 UserServiceImpl 封装成 UserDetails 交给 SpringSecurity去认证的，我们还可以让用户实体类直接实现UserDetails：

MyUser：

package com.blu.entity;

import java.util.Collection;
import java.util.List;

import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import com.fasterxml.jackson.annotation.JsonIgnore;

public class MyUser implements UserDetails {
	
	@Data
	private Integer id;
	private String name;
	private String password;
	private List roles;

	@JsonIgnore
	@Override
	public Collection getAuthorities() {
		
		return roles;
	}

	@Override
	public String getPassword() {
		return password;
	}

	@JsonIgnore
	@Override
	public String getUsername() {
		return name;
	}

	@JsonIgnore
	@Override
	public boolean isAccountNonExpired() {
		return true;
	}

	@JsonIgnore
	@Override
	public boolean isAccountNonLocked() {
		return true;
	}

	@JsonIgnore
	@Override
	public boolean isCredentialsNonExpired() {
		return true;
	}

	@JsonIgnore
	@Override
	public boolean isEnabled() {
		return true;
	}
	
}

MyRole：

package com.blu.entity;

import org.springframework.security.core.GrantedAuthority;
import com.fasterxml.jackson.annotation.JsonIgnore;

@Data
public class MyRole implements GrantedAuthority {
	
	private Integer id;
	private String name;
	
	@JsonIgnore
	@Override
	public String getAuthority() {
		return name;
	}

}

MyUserMapper：

package com.blu.mapper;

import com.blu.entity.MyUser;

public interface MyUserMapper {
	
	MyUser findByName(String name);

}

	
		
		
		
		
			
			
		
	

	
		select u.id uid,u.name uname,u.password,r.id rid,r.name rname
		from user u,role r,role_user ur 
		where u.name = #{name} and ur.user_id = u.id and ur.role_id = r.id
	

修改：UserServiceImpl：

package com.blu.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

import com.blu.entity.MyUser;
import com.blu.mapper.MyUserMapper;
import com.blu.service.UserService;

@Service
public class UserServiceImpl implements UserService {
	
	@Autowired
	private MyUserMapper myUserMapper;

	@Override
	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
		MyUser myUser = myUserMapper.findByName(username);
		return myUser;
	}

}