原因：java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
高版本tomcat中的新特性：就是严格按照 RFC 3986规范进行访问解析，而 RFC 3986规范定义了Url中只允许包含英文字母（a-zA-Z）、数字（0-9）、-_.~4个特殊字符以及所有保留字符(RFC3986中指定了以下字符为保留字符：! * ’ ( ) ; : @ & = + $ , / ? # [ ])。
springboot默认集成了tomcat，tomcat然后当你前端发送请求，请求参数中有保留的特殊字符时，就会报如下错
java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986
at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:472)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:683)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
有两种解决办法，一种降低tomcat版本（不建议），这里就不写了，另一种是在SpringBoot中增加tomcat配置
在config中新建一个TomcatConfig类
@Configuration
public class TomcatConfig {@Beanpublic TomcatServletWebServerFactory webServerFactory() {TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();factory.addConnectorCustomizers((Connector connector) -> {connector.setProperty("relaxedPathChars", "\"<>[\\]^`{|}");connector.setProperty("relaxedQueryChars", "\"<>[\\]^`{|}");});return factory;}
}然后重启项目测试，问题解决