在Application中添加静态代码块:

//默认情况下Tomcat等服务器是拒绝url中带%2F或者%5C的URL,因为它们经浏览器解析之后就变成了/和\,
// 服务器默认是拒绝访问的,所以需要通过服务的配置来解决这个问题。
static {
//解决URL中包含%2F的问题
System.setProperty("org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH", "true");
//解决URL中包含%5C的问题
System.setProperty("org.apache.catalina.connector.CoyoteAdapter.ALLOW_BACKSLASH", "true");
}

增加一个配置类:

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.util.UrlPathHelper;

@Configuration
@EnableWebMvc
public class WebConfiguration implements WebMvcConfigurer {

@Override
public void configurePathMatch(PathMatchConfigurer configurer) {
UrlPathHelper urlPathHelper = new UrlPathHelper();
urlPathHelper.setUrlDecode(false);
urlPathHelper.setAlwaysUseFullPath(true);//设置总使用完整路径
configurer.setUseSuffixPatternMatch(false);
configurer.setUseRegisteredSuffixPatternMatch(true);
configurer.setUrlPathHelper(urlPathHelper);
}

@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**").allowedOrigins("*");
}
}

搞定!