springboot拦截器之验证登录

添加jar包，这个jar包不是必须的，只是在拦截器里用到了，如果不用的话，完全可以不引入

<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>

springboot默认为Tomcat，如果用jetty，还需要引入

<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>

1、以登录验证为例，首先创建个@Auth注解

package com.demo.interceptor;

import java.lang.annotation.*;

/**
* Created by huguoju on 2016/12/30.
* 在类或方法上添加@Auth就验证登录
*/
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Auth {
}

2、创建一个Constants，在拦截器里用

package com.demo.util;

/**
* Created by huguoju on 2016/12/30.
*/
public interface Constants {
int MAX_FILE_UPLOAD_SIZE = 5242880;
String MOBILE_NUMBER_SESSION_KEY = "sessionMobileNumber";
String USER_CODE_SESSION_KEY = "userCode";
String SESSION_KEY = "sessionId";
}

3、创建一个SessionData，用于保存在session中的字段

package com.demo.model;

import lombok.Data;

/**
* Created by huguoju on 2016/12/30.
*/
@Data
public class SessionData {
private Integer userCode;
private String mobileNumber;
}

4、实现登录拦截实现

package com.demo.interceptor;

import com.demo.model.SessionData;
import com.demo.util.RedisUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

import static com.demo.util.Constants.MOBILE_NUMBER_SESSION_KEY;
import static com.demo.util.Constants.SESSION_KEY;
import static com.demo.util.Constants.USER_CODE_SESSION_KEY;

/**
* Created by huguoju on 2016/12/30.
*/
@Component
public class LoginInterceptor extends HandlerInterceptorAdapter {
@Autowired
private RedisUtil redisUtils;
private final static String SESSION_KEY_PREFIX = "session:";
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
if (!handler.getClass().isAssignableFrom(HandlerMethod.class)) {
return true;
}
handlerSession(request);

final HandlerMethod handlerMethod = (HandlerMethod) handler;
final Method method = handlerMethod.getMethod();
final Class<?> clazz = method.getDeclaringClass();
if (clazz.isAnnotationPresent(Auth.class) ||
method.isAnnotationPresent(Auth.class)) {
if(request.getAttribute(USER_CODE_SESSION_KEY) == null){

throw new Exception();

}else{
return true;
}
}

return true;

}
public void handlerSession(HttpServletRequest request) {
String sessionId = request.getHeader(SESSION_KEY);
if(org.apache.commons.lang3.StringUtils.isBlank(sessionId)){
sessionId=(String) request.getSession().getAttribute(SESSION_KEY);
}
if (org.apache.commons.lang3.StringUtils.isNotBlank(sessionId)) {
SessionData model = (SessionData) redisUtils.get(SESSION_KEY_PREFIX+sessionId);
if (model == null) {
return ;
}
request.setAttribute(SESSION_KEY,sessionId);
Integer userCode = model.getUserCode();
if (userCode != null) {
request.setAttribute(USER_CODE_SESSION_KEY, Long.valueOf(userCode));
}
String mobile = model.getMobileNumber();
if (mobile != null) {
request.setAttribute(MOBILE_NUMBER_SESSION_KEY, mobile);
}
}
return ;
}
}

5、配置拦截器

package com.demo.interceptor;

import org.hibernate.validator.HibernateValidator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.validation.Validator;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
import org.springframework.validation.beanvalidation.MethodValidationPostProcessor;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

/**
* Created by huguoju on 2016/12/30.
*/
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.demo.controller")
@PropertySource(value = "classpath:application.properties",
ignoreResourceNotFound = true,encoding = "UTF-8")
public class MvcConfig extends WebMvcConfigurerAdapter {
private static final Logger logger = LoggerFactory.getLogger(MvcConfig.class);
@Autowired
LoginInterceptor loginInterceptor;

/**
* <p>
* 视图处理器
* </p>
*
* @return
*/
@Bean
public ViewResolver viewResolver() {
logger.info("ViewResolver");
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/jsp/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}

/**
* 拦截器配置
* @param registry
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
// 注册监控拦截器
registry.addInterceptor(loginInterceptor)
.addPathPatterns("/**")
.excludePathPatterns("/configuration/ui");

}

@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**")
.allowedOrigins("*")
.allowedHeaders("*/*")
.allowedMethods("*")
.maxAge(120);
}

/**
* 资源处理器
* @param registry
*/
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
logger.info("addResourceHandlers");
registry.addResourceHandler("/swagger-ui.html")
.addResourceLocations("classpath:/META-INF/resources/");
registry.addResourceHandler("/webjars/**")
.addResourceLocations("classpath:/META-INF/resources/webjars/");
}

}

以上就完成了，测试时可以在LoginInterceptor里打断点，然后在controller上或者方法上添加@Auth注解，
controller上添加以后这个controller里所有请求都验证登录，在方法里添加只有请求这个方法时验证

@Auth
@RestController
public class TestController {

}

原文：https://blog.csdn.net/u011493599/article/details/53942757