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在springboot+springsecurity的基础上+JWT（私钥加密，公钥解密）_springboot+springsecurity+jwt

作者：小桥流水78 | 2024-07-26 14:30:12

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springboot+springsecurity+jwt

一、已经完成了springboot+springsecurity的工作（若没完成，请移步 security的使用）：三个工具类 ，放在项目专门存放工具类的包下面

（1）、jwtUtils.java: JWT生成TOKEN
导入依赖

<dependency>
    <groupId>com.auth0</groupId>
    <artifactId>java-jwt</artifactId>
    <version>4.4.0</version>
</dependency>

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生成JWT工具代码：

package com.aliyun.vuelogin.util;

import com.aliyun.vuelogin.common.Payload;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jws;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.joda.time.DateTime;

import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Base64;
import java.util.UUID;

/**
 * @author:
 * 生成token以及校验token相关方法
 */
public class JwtUtils {

    private static final String JWT_PAYLOAD_USER_KEY = "user";

    /**
     * 私钥加密token
     *
     * @param userInfo   载荷中的数据
     * @param privateKey 私钥
     * @param expire     过期时间，单位分钟
     * @return JWT
     */
    public static String generateTokenExpireInMinutes(Object userInfo, PrivateKey privateKey, int expire) {
        return Jwts.builder()
                .claim(JWT_PAYLOAD_USER_KEY, JsonUtils.toString(userInfo))
                .setId(createJTI())
                .setExpiration(DateTime.now().plusMinutes(expire).toDate())
                .signWith(privateKey, SignatureAlgorithm.RS256)
                .compact();
    }

    /**
     * 私钥加密token
     *
     * @param userInfo   载荷中的数据
     * @param privateKey 私钥
     * @param expire     过期时间，单位秒
     * @return JWT
     */
    public static String generateTokenExpireInSeconds(Object userInfo, PrivateKey privateKey, int expire) {
        return Jwts.builder()
                .claim(JWT_PAYLOAD_USER_KEY, JsonUtils.toString(userInfo))
                .setId(createJTI())
                .setExpiration(DateTime.now().plusSeconds(expire).toDate())
                .signWith(privateKey, SignatureAlgorithm.RS256)
                .compact();
    }

    /**
     * 公钥解析token
     *
     * @param token     用户请求中的token
     * @param publicKey 公钥
     * @return Jws<Claims>
     */
    private static Jws<Claims> parserToken(String token, PublicKey publicKey) {
        return Jwts.parser().setSigningKey(publicKey).parseClaimsJws(token);
    }

    private static String createJTI() {
        return new String(Base64.getEncoder().encode(UUID.randomUUID().toString().getBytes()));
    }

    /**
     * 获取token中的用户信息
     *
     * @param token     用户请求中的令牌
     * @param publicKey 公钥
     * @return 用户信息
     */
    public static <T> Payload<T> getInfoFromToken(String token, PublicKey publicKey, Class<T> userType) {
        Jws<Claims> claimsJws = parserToken(token, publicKey);
        Claims body = claimsJws.getBody();
        Payload<T> claims = new Payload<>();
        claims.setId(body.getId());
        claims.setUserInfo(JsonUtils.toBean(body.get(JWT_PAYLOAD_USER_KEY).toString(), userType));
        claims.setExpiration(body.getExpiration());
        return claims;
    }

    /**
     * 获取token中的载荷信息
     *
     * @param token     用户请求中的令牌
     * @param publicKey 公钥
     * @return 用户信息
     */
    public static <T> Payload<T> getInfoFromToken(String token, PublicKey publicKey) {
        Jws<Claims> claimsJws = parserToken(token, publicKey);
        Claims body = claimsJws.getBody();
        Payload<T> claims = new Payload<>();
        claims.setId(body.getId());
        claims.setExpiration(body.getExpiration());
        return claims;
    }
}

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（2）、jsonUtils.java: json和其他类型转化的工具类

package com.aliyun.vuelogin.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.List;
import java.util.Map;

/**
 * @author: 
 **/
public class JsonUtils {

    public static final ObjectMapper mapper = new ObjectMapper();

    private static final Logger logger = LoggerFactory.getLogger(JsonUtils.class);

    public static String toString(Object obj) {
        if (obj == null) {
            return null;
        }
        if (obj.getClass() == String.class) {
            return (String) obj;
        }
        try {
            return mapper.writeValueAsString(obj);
        } catch (JsonProcessingException e) {
            logger.error("json序列化出错：" + obj, e);
            return null;
        }
    }

    public static <T> T toBean(String json, Class<T> tClass) {
        try {
            return mapper.readValue(json, tClass);
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }

    public static <E> List<E> toList(String json, Class<E> eClass) {
        try {
            return mapper.readValue(json, mapper.getTypeFactory().constructCollectionType(List.class, eClass));
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }

    public static <K, V> Map<K, V> toMap(String json, Class<K> kClass, Class<V> vClass) {
        try {
            return mapper.readValue(json, mapper.getTypeFactory().constructMapType(Map.class, kClass, vClass));
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }

    public static <T> T nativeRead(String json, TypeReference<T> type) {
        try {
            return mapper.readValue(json, type);
        } catch (IOException e) {
            logger.error("json解析出错：" + json, e);
            return null;
        }
    }
}


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（3）、RsaUtils.java：公钥、私钥生成工具类

package com.aliyun.vuelogin.util;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.security.*;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

/**
 * 根据文件地址 得到公钥 私钥
 * @author
 */
public class RsaUtils {

    private static final int DEFAULT_KEY_SIZE = 2048;
    /**
     * 从文件中读取公钥
     *
     * @param filename 公钥保存路径，相对于classpath
     * @return 公钥对象
     * @throws Exception
     */
    public static PublicKey getPublicKey(String filename) throws Exception {
        byte[] bytes = readFile(filename);
        return getPublicKey(bytes);
    }

    /**
     * 从文件中读取密钥
     *
     * @param filename 私钥保存路径，相对于classpath
     * @return 私钥对象
     * @throws Exception
     */
    public static PrivateKey getPrivateKey(String filename) throws Exception {
        byte[] bytes = readFile(filename);
        return getPrivateKey(bytes);
    }

    /**
     * 获取公钥
     *
     * @param bytes 公钥的字节形式
     * @return
     * @throws Exception
     */
    private static PublicKey getPublicKey(byte[] bytes) throws Exception {
        bytes = Base64.getDecoder().decode(bytes);
        X509EncodedKeySpec spec = new X509EncodedKeySpec(bytes);
        KeyFactory factory = KeyFactory.getInstance("RSA");
        return factory.generatePublic(spec);
    }

    /**
     * 获取密钥
     *
     * @param bytes 私钥的字节形式
     * @return
     * @throws Exception
     */
    private static PrivateKey getPrivateKey(byte[] bytes) throws NoSuchAlgorithmException, InvalidKeySpecException {
        bytes = Base64.getDecoder().decode(bytes);
        PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(bytes);
        KeyFactory factory = KeyFactory.getInstance("RSA");
        return factory.generatePrivate(spec);
    }

    /**
     * 根据密文，生存rsa公钥和私钥,并写入指定文件
     *
     * @param publicKeyFilename  公钥文件路径
     * @param privateKeyFilename 私钥文件路径
     * @param secret             生成密钥的密文
     */
    public static void generateKey(String publicKeyFilename, String privateKeyFilename, String secret, int keySize) throws Exception {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        SecureRandom secureRandom = new SecureRandom(secret.getBytes());
        keyPairGenerator.initialize(Math.max(keySize, DEFAULT_KEY_SIZE), secureRandom);
        KeyPair keyPair = keyPairGenerator.genKeyPair();
        // 获取公钥并写出
        byte[] publicKeyBytes = keyPair.getPublic().getEncoded();
        publicKeyBytes = Base64.getEncoder().encode(publicKeyBytes);
        writeFile(publicKeyFilename, publicKeyBytes);
        // 获取私钥并写出
        byte[] privateKeyBytes = keyPair.getPrivate().getEncoded();
        privateKeyBytes = Base64.getEncoder().encode(privateKeyBytes);
        writeFile(privateKeyFilename, privateKeyBytes);
    }

    private static byte[] readFile(String fileName) throws Exception {
        return Files.readAllBytes(new File(fileName).toPath());
    }

    private static void writeFile(String destPath, byte[] bytes) throws IOException {
        File dest = new File(destPath);
        if (!dest.exists()) {
            dest.createNewFile();
        }
        Files.write(dest.toPath(), bytes);
    }
}

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二、封装一下，生成公钥、私钥的实体类，也可以放在工具类里

package com.aliyun.vuelogin.common;

import com.aliyun.vuelogin.util.RsaUtils;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;
import java.security.PrivateKey;
import java.security.PublicKey;

/**
 * 生成公钥 私钥方法
 * */
@ConfigurationProperties("rsa.key")
public class RsaKeyProperties {
    private String pubKeyFile;

    private PublicKey publicKey;

    private String priKeyFile;

    private PrivateKey privateKey;

    @PostConstruct
    public void createRsaKey() throws Exception {
        publicKey = RsaUtils.getPublicKey(pubKeyFile);
        privateKey = RsaUtils.getPrivateKey(priKeyFile);
    }

    public String getPubKeyFile() {
        return pubKeyFile;
    }

    public void setPubKeyFile(String pubKeyFile) {
        this.pubKeyFile = pubKeyFile;
    }

    public PublicKey getPublicKey() {
        return publicKey;
    }

    public void setPublicKey(PublicKey publicKey) {
        this.publicKey = publicKey;
    }

    public String getPriKeyFile() {
        return priKeyFile;
    }

    public void setPriKeyFile(String priKeyFile) {
        this.priKeyFile = priKeyFile;
    }

    public PrivateKey getPrivateKey() {
        return privateKey;
    }

    public void setPrivateKey(PrivateKey privateKey) {
        this.privateKey = privateKey;
    }
}


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三、 新建JwtFilter包，与工具类包同级，包里写认证过滤器JwtLoginFilter.java和授权过滤器JwtVerifyFilter.java。代码如下：

package com.aliyun.vuelogin.JwtFilter;

import com.aliyun.vuelogin.common.RsaKeyProperties;
import com.aliyun.vuelogin.model.SysRole;
import com.aliyun.vuelogin.model.SysUser;
import com.aliyun.vuelogin.util.JwtUtils;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.security.authentication.AuthenticationManager;
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;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * jwt登录认证过滤器
 * */
public class JwtLoginFilter extends UsernamePasswordAuthenticationFilter {

    private AuthenticationManager authenticationManager;
    private RsaKeyProperties prop;

    public JwtLoginFilter(AuthenticationManager authenticationManager, RsaKeyProperties prop) {
        this.authenticationManager = authenticationManager;
        this.prop = prop;
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        try{
            SysUser sysUser = new ObjectMapper().readValue(request.getInputStream(), SysUser.class);
            UsernamePasswordAuthenticationToken authRequest=new UsernamePasswordAuthenticationToken(sysUser.getUsername(),sysUser.getPassword());
            return authenticationManager.authenticate(authRequest);
        }catch (Exception e){
            try{
                response.setContentType("application/json;charset=utf-8");
                response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
                PrintWriter out=response.getWriter();
                Map resultMap=new HashMap();
                resultMap.put("code",HttpServletResponse.SC_UNAUTHORIZED);
                resultMap.put("msg","用户名或密码错误!");
                out.write(new ObjectMapper().writeValueAsString(resultMap));
                out.flush();
                out.close();
            }catch(Exception outEx){
                outEx.printStackTrace();
            }
            throw new RuntimeException();
        }
    }
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException {
        SysUser sysUser=new SysUser();
        sysUser.setUsername(authResult.getName());
        sysUser.setRoles((List<SysRole>) authResult.getAuthorities());
        String token = JwtUtils.generateTokenExpireInMinutes(sysUser, prop.getPrivateKey(), 24 * 60);
        response.setHeader("Authorization","bearer"+token);
        try{
            response.setContentType("application/json;charset=utf-8");
            response.setStatus(HttpServletResponse.SC_OK);
            PrintWriter out=response.getWriter();
            Map resultMap=new HashMap();
            resultMap.put("code",HttpServletResponse.SC_OK);
            resultMap.put("msg","登录成功!");
            out.write(new ObjectMapper().writeValueAsString(resultMap));
            out.flush();
            out.close();
        }catch(Exception outEx){
            outEx.printStackTrace();
        }
    }
}


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package com.aliyun.vuelogin.JwtFilter;

import com.aliyun.vuelogin.common.Payload;
import com.aliyun.vuelogin.common.RsaKeyProperties;
import com.aliyun.vuelogin.model.SysUser;
import com.aliyun.vuelogin.util.JwtUtils;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

/**
 * jwt权限验证过滤器
 * */
public class JwtVerifyFilter extends BasicAuthenticationFilter {

    private RsaKeyProperties prop;
    public JwtVerifyFilter(AuthenticationManager authenticationManager,RsaKeyProperties prop) {
        super(authenticationManager);
        this.prop=prop;
    }

    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        String header = request.getHeader("Authorization");
        System.out.println(header);
        if (header == null || !header.startsWith("bearer")) {//未携带合适的token，没认证成功
            chain.doFilter(request, response);
            response.setContentType("application/json;charset=utf-8");
            response.setStatus(HttpServletResponse.SC_FORBIDDEN);
            PrintWriter out=response.getWriter();
            Map resultMap=new HashMap();
            resultMap.put("code",HttpServletResponse.SC_FORBIDDEN);
            resultMap.put("msg","请登录!");
            out.write(new ObjectMapper().writeValueAsString(resultMap));
            out.flush();
            out.close();
        } else {//携带了合适的token，但token不一定合法
            String token = header.replace("bearer", "");
            //验证token是否正确
            Payload<SysUser> payload = JwtUtils.getInfoFromToken(token, prop.getPublicKey(), SysUser.class);
            SysUser userInfo = payload.getUserInfo();
            if(userInfo!=null){
                UsernamePasswordAuthenticationToken authRequest=new UsernamePasswordAuthenticationToken(userInfo.getUsername(),null,userInfo.getAuthorities());
                SecurityContextHolder.getContext().setAuthentication(authRequest);
                chain.doFilter(request, response);
            }
        }
    }

}


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四、在配置文件 application.yml添加公钥和密钥文件存放的地址，以供第二步中实体类使用

rsa:
  key:
    pubKeyFile: D:\work\MyProject\springboot-aliyun\vuelogin\id_key_rsa.pub
    priKeyFile: D:\work\MyProject\springboot-aliyun\vuelogin\id_key_rsa

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五、修改springsecurity的配置类如下：

package com.aliyun.vuelogin.security;
import com.aliyun.vuelogin.JwtFilter.JwtLoginFilter;
import com.aliyun.vuelogin.JwtFilter.JwtVerifyFilter;
import com.aliyun.vuelogin.common.RsaKeyProperties;
import com.aliyun.vuelogin.service.SysUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
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.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

@EnableWebSecurity
@EnableGlobalMethodSecurity(securedEnabled = true)
public class SecurityJwtConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    SysUserService sysUserService;

    @Autowired
    RsaKeyProperties prop;

    @Bean
    BCryptPasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        System.out.println("执行授权方法");
        //shiro路径下所有人都可以访问，security只有vip可以访问
        http.csrf().disable()
            .authorizeRequests()
            .antMatchers("/shiro/*").permitAll()
            .antMatchers("/security/tologin").permitAll()
            .antMatchers("/security/*").hasAnyRole("vip")
            //下面一行代码表示其他所有资源只有认证通过才能访问
            .anyRequest().authenticated()
            //下面添加过滤器
            .and().addFilter(new JwtLoginFilter(super.authenticationManager(),prop))
            .addFilter(new JwtVerifyFilter(super.authenticationManager(),prop))
            //下面禁用session
            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
        //也可以这样写http.csrf().disable();//关闭网站拦截get请求
//        //开启---没有权限跳转到登录页面
//        http.formLogin()
//                .loginPage("/security/tologin")//设置为自己写的登录页面
//                .usernameParameter("account")//设置前端传的用户名字段名
//                .passwordParameter("password")//设置前端传的密码字段名
//                .loginProcessingUrl("/login");//设置实际提交用户名和密码的路径，这个“/login”是security自带的，不用自己写
//        http.formLogin().successForwardUrl("/security/test");
//        http.rememberMe().rememberMeParameter("remember");//开启记住我功能（cookie）
//        http.logout().logoutSuccessUrl("/security/tologin"); //开启登出（注销）
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        System.out.println("执行认证方法");
        /*
        下面的代码：
        auth.inMemoryAuthentication().withUser("Eric").password("123456").roles("vip")
        .and().withUser("root").password("root").roles("vvip");
        正常是从数据库中读取，这里仅模拟一下用户名和密码和权限
        注意，这里如果springboot版本过高，即使登陆了，也会报500 PasswordEncoder（密码未加密） 的错误
        在security5中新增了许多内置加密的方法，下面使用其中一种 .passwordEncoder(new BCryptPasswordEncoder())
        * */
        /**下面三行代码是使用内存 设置临时用户名和密码
         *  auth.inMemoryAuthentication().passwordEncoder(new BCryptPasswordEncoder())
         *                 .withUser("Eric").password(new BCryptPasswordEncoder().encode("1")).roles("vip")
         *                 .and().withUser("root").password(new BCryptPasswordEncoder().encode("root")).roles("vvip");
         */
        //注意 此时权限role已经在sysUserService的loadUserByUsername返回值里了，但数据库表里必须把权限字段加上”ROLE_“的前缀
        //  例如：数据库权限字段值为ROLE_vip才能验证.hasRole("vip")的vip， 否则从数据库里查询的权限不能识别
        auth.userDetailsService(sysUserService).passwordEncoder(passwordEncoder());
           }
}

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