前后端分离项目，token的生成及存储至redis数据库

MD5加密类

package common;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {

    public static String getMd5(String plainText,int length ) {
        String result = "";
        try {
            MessageDigest md= MessageDigest.getInstance("MD5");

            md.update(plainText.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if(i<0) i+= 256;
                if(i<16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            if(length==32) {
                //32位加密
                result = buf.toString();
            }else if(length==16) {
                //16位加密
                result = buf.toString().substring(8, 24);
            }else if(length==6){

                result = buf.toString().substring(0, 6);
            }else {
                return "";
            }
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return result;
    }


}

redis数据库类

package service.serviceImpl;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

public class RedisAPI {

     public JedisPool  jedisPool;


    public JedisPool getJedisPool() {
        return jedisPool;
    }

    public void setJedisPool(JedisPool jedisPool) {

        this.jedisPool = jedisPool;
    }

    public String get(String key){
        Jedis jedis=jedisPool.getResource();
        String value= jedis.get(key);
        jedisPool.returnResource(jedis);
        return value;
    }

    public String set(String key,String value){
        Jedis jedis=jedisPool.getResource();
        String result= jedis.set(key, value);
        jedisPool.returnResource(jedis);
        return result;
    }

    public String set(String key,int seconds,String value){
        Jedis jedis=jedisPool.getResource();
        String result=jedis.setex(key, seconds, value);
        jedisPool.returnResource(jedis);
        return value;
    }

    public boolean exists(String key){
        Jedis jedis=jedisPool.getResource();
        boolean result=jedis.exists(key);
        jedisPool.returnResource(jedis);
        return result;
    }

    public Long ttl(String key){
        Jedis jedis=jedisPool.getResource();
        Long result=jedis.ttl(key);
        jedisPool.returnResource(jedis);
        return result;

    }

    public Long dell(String key){
        Jedis jedis=jedisPool.getResource();
        Long result=jedis.del(key);
        jedisPool.returnResource(jedis);
        return result;

    }
}

token的生成和保存接口类

package service;

import entity.User;

public interface TokenService {

//生成token
public String generateToken(String userAgent, User user) throws Exception;

 //生成save
public void save(String token, User user) throws Exception;

public boolean validate(String userAgent,String token) throws Exception;}

token接口的实现类 token生成类型：PC-NAME-USERID-CREATIONDATE-RONDEM(6位)
既： PC-32位加密的用户名-用户id-年月日时分秒-6位随机数

package service.serviceImpl;

import com.alibaba.fastjson.JSON;
import common.MD5;
import entity.User;
import nl.bitwalker.useragentutils.UserAgent;
import org.springframework.stereotype.Service;
import service.TokenService;

import javax.annotation.Resource;
import java.text.SimpleDateFormat;
import java.util.Date;


@Service("tokenService")
public class TokenServiceImpl  implements TokenService {
       @Resource
       private RedisAPI redisAPI;
    @Override
      //   pc-32位加密的用户名-用户id-年月日时分 秒-6位随机数
    //前缀 PC-NAME-USERID-CREATIONDATE-RONDEM(6位)
    // 生成token
    public String generateToken(String userAgent, User user) throws Exception {
        StringBuilder  str=new StringBuilder();
        str.append("token:");
        //获取用户代理
        UserAgent agent=UserAgent.parseUserAgentString(userAgent);
        //判断是否是手机端还是电脑端
       if(agent.getOperatingSystem().isMobileDevice()){
           str.append("MOBILE-");
       }else{
           str.append("PC-");
       }
        str.append(MD5.getMd5(user.getName(),32)+"-");
        str.append(user.getId().toString()+"-");
        str.append(new SimpleDateFormat("yyyyMMddHHmmsss").format(new Date())+"-");
        str.append(MD5.getMd5(userAgent,6));

        return str.toString();
    }
@Override
// 保存token信息
public void save(String token,User user) throws Exception {
    if(token.startsWith("token:PC-")){
        redisAPI.set(token, 2 * 60 * 60, JSON.toJSONString(user));
    }else{
        redisAPI.set(token, JSON.toJSONString(user));
    }

}

@Override
public boolean validate(String userAgent, String token) throws Exception {
        String agentMd5 = token.split("-")[4];
      if(!redisAPI.exists(token)){
      return false;
      }else if(!MD5.getMd5(userAgent,6).equals(agentMd5)){
         return false;
      }

    return true;
 } }

用户service层

package service;

import entity.User;

public interface UserService {

    public User  login(String name, String password) throws Exception;

    public User findUser(String name)throws Exception;





}

用户service层实现类

```
package service;

import entity.User;

public class UserServiceImpl implements UserService{

    @Override
    public User login(String name, String password) throws Exception {
      User user=this.findUser(name);
      if(user!=null && user.getPassword().equals(password)){

          return user;
      }
       else
        return null;
    }

    @Override
    public User findUser(String name) throws Exception {


        return null;
  }
}

controller层

package Controller;


import common.MD5;
import entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import service.TokenService;
import service.UserService;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;


@Controller
@RequestMapping("/api")
   public class LoginController{

  @Resource
  private TokenService tokenService;

  @Resource
  private UserService userService;

  @RequestMapping(value="/dologin",method =RequestMethod.POST,
    produces = "application/json")
 public void login(@RequestParam String name, @RequestParam String password,
                   HttpServletRequest request){
      try {
          User user=userService.login(name, MD5.getMd5(password,32));
          if(user!=null && !user.equals("")){
             String userAgent=request.getHeader("user-agent");
             String token =tokenService.generateToken(userAgent,user);
             tokenService.save(token,user);
          }



      } catch (Exception e) {
          e.printStackTrace();
      }


  }  }

感觉有帮助，就关注下吧。谢谢！