spring boot拦截器验证token防止表单重复提交

第一步：先写token生成和销毁方法

token.java

import java.lang.annotation.*;  
  
@Target(ElementType.METHOD)  
@Retention (RetentionPolicy.RUNTIME)  
@Documented  
public @interface Token {  
   boolean save() default false;  
   boolean remove() default false;  
}

TokenInterceptor.java

import java.lang.reflect.Method;  
import java.util.UUID;  
  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
  
import org.springframework.web.method.HandlerMethod;  
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;  
  
public class TokenInterceptor extends HandlerInterceptorAdapter {  
      
    @Override  
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {  
        if (handler instanceof HandlerMethod) {  
            HandlerMethod handlerMethod = (HandlerMethod) handler;  
            Method method = handlerMethod.getMethod();  
            Token annotation = method.getAnnotation(Token.class);  
            if (annotation != null) {  
                boolean needSaveSession = annotation.save();  
                if (needSaveSession) {  
                    request.getSession(false).setAttribute("token", UUID.randomUUID().toString());  
                }  
                boolean needRemoveSession = annotation.remove();  
                if (needRemoveSession) {  
                    if (isRepeatSubmit(request)) {  
                        return false;  
                    }  
                    request.getSession(false).removeAttribute("token");  
                }  
            }  
            return true;  
        } else {  
            return super.preHandle(request, response, handler);  
        }  
    }  
  
    private boolean isRepeatSubmit(HttpServletRequest request) {  
        String serverToken = (String) request.getSession(false).getAttribute("token");  
        if (serverToken == null) {  
            return true;  
        }  
        String clinetToken = request.getParameter("token");  
        if (clinetToken == null) {  
            return true;  
        }  
        if (!serverToken.equals(clinetToken)) {  
            return true;  
        }  
        return false;  
    }  
}

第二步：写springboot的拦截器，拦截对应的访问方法地址，进行token验证

import org.springframework.boot.SpringApplication;  
import org.springframework.context.annotation.ComponentScan;  
import org.springframework.context.annotation.Configuration;  
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;  
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;  
  
import com.smartt.api.interceptor.TokenInterceptor;  
  
@Configuration  
@ComponentScan(useDefaultFilters = true)  
public class WebAppConfig extends WebMvcConfigurerAdapter {  
  
    public static void main(String[] args) {    
        SpringApplication.run(WebAppConfig.class, args);    
    }     
        
    /**   
     * 配置拦截器   
     * @author lance   
     * @param registry   
     */    
    public void addInterceptors(InterceptorRegistry registry) {    
        registry.addInterceptor(new TokenInterceptor()).addPathPatterns("/admin/**");    
    }    
}

/admin/ 对应的controller访问路径的，如果多个不同的访问地址可以这么写 /**  或 
如果写了多个又不想全部都拦截可以这么写

// 多个拦截器组成一个拦截器链  
        // addPathPatterns 用于添加拦截规则  
        // excludePathPatterns 用户排除拦截  
        registry.addInterceptor(new MyInterceptor1()).addPathPatterns("/xxx1/**");  
        registry.addInterceptor(new MyInterceptor2()).addPathPatterns("/xxx2/**");

第三步：在需要token验证的方法处加入  @Token(save=true)    要进行token验证的地方加入 @Token(remove=true)

并且在 对应的jsp页面  加入  <input type="hidden" name="token" value="${token}"/>