java.lang.IllegalArgumentException: Last unit does not have enough valid bits 异常的解决

前言

本文主要jwt出现的异常问题，如果有什么需要改进的地方还请大佬指出⛺️

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index.php/tags-602.html" >使用封装好的 JwtUtil 的工具类时，自定义设置秘钥明文，启动后报错：

public class JwtUtil {//有效期为public static final Long JWT_TTL = 72*60 * 60 *1000L;// 60 * 60 *1000  一个小时//设置秘钥明文public static final String JWT_KEY = "qingzhiqc";public static String getUUID(){String token = UUID.randomUUID().toString().replaceAll("-", "");return token;}/** * 生成jtw * @param subject token中要存放的数据（json格式） * @return */public static String createJWT(String subject) {JwtBuilder builder = getJwtBuilder(subject, null, getUUID());// 设置过期时间return builder.compact();}

报错信息：

java.lang.IllegalArgumentException: Last unit does not have enough valid bitsat java.util.Base64$Decoder.decode0(Base64.java:734) ~[na:1.8.0_281]at java.util.Base64$Decoder.decode(Base64.java:526) ~[na:1.8.0_281]at java.util.Base64$Decoder.decode(Base64.java:549) ~[na:1.8.0_281]at com.qingzhi.utils.JwtUtil.generalKey(JwtUtil.java:91) ~[classes/:na]at com.qingzhi.utils.JwtUtil.getJwtBuilder(JwtUtil.java:51) ~[classes/:na]at com.qingzhi.utils.JwtUtil.createJWT(JwtUtil.java:34) ~[classes/:na]at com.qingzhi.service.impl.BlogLoginServiceImpl.login(BlogLoginServiceImpl.java:53) ~[classes/:na]at com.qingzhi.controller.BlogLoginController.login(BlogLoginController.java:34) ~[classes/:na]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_281]at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_281]at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_281]at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_281]at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.7.jar:5.3.7]at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.7.jar:5.3.7]at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.7.jar:5.3.7]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.7.jar:5.3.7]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.7.jar:5.3.7]at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.7.jar:5.3.7]at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1063) ~[spring-webmvc-5.3.7.jar:5.3.7]at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.7.jar:5.3.7]at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.3.7.jar:5.3.7]at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) [spring-webmvc-5.3.7.jar:5.3.7]at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) [tomcat-embed-core-9.0.46.jar:4.0.FR]`

报错信息整整齐齐，如图所示，在进行base64加密和解密的过程中会出现这个问题，报错网上找了一些文章，根本原因为：编码后的字符串长度不符合要求（要求长度是4的倍数）

所以，这里我设置的秘钥明文有问题，最初设置的为 qingzhiqc ,我将 qingzhiqc 改为 qingzhi，再次执行正常生成 jwt

"eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiI1ZWRlNzcyNWE3ZTQ0ODAzYTU3YjM1MzNmNjdjMzYxMCIsInN1YiI6IjEiLCJpc3MiOiJIRiIsImlhdCI6MTcwMDA0MTUxMywiZXhwIjoxNzAwMzAwNzEzfQ.cICUhn1KU7Ghego92x2h1vv8IOyfWb5zZA0IhdcxGWU"

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