因为JJWT除了EdDSA标准没有实现之外,其他标准全部都可以使用。

1.新建一个项目叫做jjwtdemo

2.使用springboot框架

3.修改pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.night</groupId>
    <artifactId>jjwtdemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>jjwtdemo</name>
    <description>jjwtdemo</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- JWT依赖 -->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.9.0</version>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.2.5.RELEASE</version>
            </plugin>
        </plugins>
    </build>

</project>

4.进行jjwt测试

进入src→main→test→com.night.jjwtdemo->JjwtdemoApplicationTests.java

package com.night.jjwtdemo;

import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.impl.Base64Codec;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.Date;

@SpringBootTest
public class JjwtdemoApplicationTests {

    @Test
    public void testCreateToken() {
        // 创建JwtBuilder对象
        JwtBuilder jwtBuilder = Jwts.builder()
                // 声明的标识{"jti":"8888"}
                .setId("8888")
                // 主体,用户(所面向的接收客户){"sub":"Rose"}
                .setSubject("Rose")
                // 设置签发时间 创建日期("ita":"年月日")
                .setIssuedAt(new Date())
                // 设置签名(算法,加盐)
                .signWith(SignatureAlgorithm.HS256,"xxxx");
        // 获取生成jwt令牌
        String token = jwtBuilder.compact();
        System.out.println(token);


        System.out.println("==================");
        // 分割字符.
        String[] split = token.split("\\.");
        // 分割第一部分:头部信息
        System.out.println(Base64Codec.BASE64.decodeToString(split[0]));
        // 分割第二部分:荷载信息
        System.out.println(Base64Codec.BASE64.decodeToString(split[1]));
        // 分割第三部分:签名信息  注:签名信息有加盐,无法解密  会形成乱码
        System.out.println(Base64Codec.BASE64.decodeToString(split[2]));
    }

}