spring boot防止表单重复提交添加拦截器验证token

#1：先写token生成和销毁方法

#token.java

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

#TokenInterceptor.java

package com.smartt.api.interceptor;
 
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;
    }
}

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

package com.smartt.api;
 
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/**");  
    }  
}

// 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/**");

#3：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