(1)InterceptorConfig.java文件内容如下：

import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.List;
import java.util.concurrent.TimeUnit;
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
// 这里通过配置文件来配置拦截规则,后续会提供配置文件内容
@Autowired
private InterceptorPathPatterns interceptorPathPatterns;
@Override
public void addInterceptors(InterceptorRegistry registry) {
// addInterceptor 添加拦截器后默认会拦截所有的http请求
InterceptorRegistration interceptorRegistration = registry.addInterceptor(newAuthorityInterceptor());
List includePathPatternsList = interceptorPathPatterns.getIncludePathPatternsList();
if (null == includePathPatternsList) {
interceptorRegistration.addPathPatterns("");
} else {
// addPathPatterns 用于添加拦截规则
interceptorRegistration.addPathPatterns(includePathPatternsList);
}
List excludePathPatternsList = interceptorPathPatterns.getExcludePathPatternsList();
if (null == excludePathPatternsList) {
interceptorRegistration.excludePathPatterns("");
} else {
// excludePathPatterns 用于排除拦截规则
interceptorRegistration.excludePathPatterns(excludePathPatternsList);
}
}
public AuthorityIntercepor newAuthorityInterceptor() {
AuthorityInterceptor authorityInterceptor = new AuthorityInterceptor();
// 以下主要是用来设定token在缓存中的有效时长
// 设定缓存过期时间
String expiredTime = 30;
// 设置缓存大小
Cache cache = CacheBuilder.newBuilder()
.maximumSize(10000)
.expireAfterAccess(Integer.parseInt(expiredTime), TimeUnit.MINUTES)
.build();
authorityInterceptor.setCache(cache);
return authorityInterceptor;
}
}
(2)InterceptorPathPatterns.java文件内容如下：
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.List;
@Component
@ConfigurationProperties(prefix = "interceptor")
public class InterceptorPathPatterns {
private List includePathPatternsList;
private List excludePathPatternsList;
public List getIncludePathPatternsList() {
return includePathPatternsList;
}
public void setIncludePathPatternsList(List includePathPatternsList) {
this.includePathPatternsList = includePathPatternsList;
}
public List getExcludePathPatternsList() {
return excludePathPatternsList;
}
public void setExcludePathPatternsList(List excludePathPatternsList) {
this.excludePathPatternsList = excludePathPatternsList;
}
}
(3)AuthorityInterceptor.java文件内容如下：
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.StreamUtils;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import com.google.common.cache.Cache;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.concurrent.Callable;
public class AuthorityInterceptor extends HandlerInterceptorAdapter {
private Cache cache = null;
public Cache getCache () {
return cache;
}
public void setCache(Cache cache) {
this.cache = cache;
}
public AuthorityInterceptor() {
super();
}
/**
* 返回false：从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
* 返回true：执行下一个拦截器,直到所有的拦截器都执行完毕
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
OutputStream outputStream = null;
try {
String number = request.getHeader("X—Person-Number");
String token = request.getHeader("X-Person-Token");
if (StringUtils.isEmpty(number) || StringUtils.isEmpty(token)) {
this.setResponseMsg(outputStream, "认证失败", response);
return false;
}
// 调用校验方法校验token
boolean bVerify = this.verifyToken(request);
if (bVerify) {
// 校验通过
return true;
} else {
// 认证失败
this.setResponseMsg(outputStream, "认证失败", response);
return false;
}
} catch (Exception exception){
throw new Exception(); // 可以抛出指定的异常
} finally {
if (outputStream != null) {
outputStream.close();
outputStream = null;
}
}
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modeAndView) throws Exception {
// 拦截器返回时的处理
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception) throws Exception {
// 视图渲染回调
}
private void setResponseMsg(OutputStream outputStream, String responseStr, HttpServletResponse response) throws IOException {
// 重新设置返回的消息类型和消息头,SPRING mvc设置为JSON类型,
// 内容修改为加密字符串后,类型也要修改为text/html,防止angularjs自动根据类型转换数据
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json;charset=UTF-8");
// 将加密数据写到原始的response对象中,返回客户端
outputStream = response.getOutputStream();
StreamUtils.copy(responseStr, Charset.forName("utf-8"), outputStream);
}
private boolean verifyToken(HttpServletRequest request) throws Exception {
try {
// 根据具体的业务场景进行逻辑判断设计
// 利用Cache的get方法进行判断，先判断缓存中是否有这个key，若是有的话，直接返回T类型对象结果。
T obj = this.cache.get(key,
new Callable() {
@Override
public T call() {
try {
// 具体的判断处理逻辑
} catch(Exception exception) {
// 可以跑出指定的异常
}
}
)
} catch (Exception exception) {
throw new Exception(exception);
}
}
}

说明：在实际应用中需要用具体的类型取代T

(4)application.properties配置文件内容如下：

#需要拦截的路径

interceptor.includePathPatternsList[1]=/**

#不需要拦截的路径

interceptor.excludePathPatternsList[0]=/test/download/**

#说明：采用这样的匹配方式是不会起作用的，例如：*.js，**.css等等

#注意：以上的拦截路径都是服务上下文之后的路径，比如说微服务名之后的路径，包括微服务名后的反斜杠

#/*不会匹配末尾的反斜杠，/**会匹配末尾的反斜杠

#若想要完全匹配路径的话，那必须要将路径写完整；模糊匹配的话就不需要了