springboot中的过滤器Filter和FilterRegistrationBean以及把request改造成HttpServletRequestWrapper

Filter:过滤器

FilterRegistrationBean：过滤器注册类

HttpServletRequestWrapper：在过滤器中把request转化为HttpServletRequestWrapper，方便做一些处理，比如把请求头加入到request

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@SpringBootConfiguration

public FilterRegistrationBean<ParameterFilter> tokenFilter(){

FilterRegistrationBean<ParameterFilter> registration = new FilterRegistrationBean<ParameterFilter>();//新建过滤器注册类

ParameterFilter filter = new ParameterFilter();//添加我们的过滤器

registration.setFilter(filter);

registration.addUrlPatterns("/*");//设置过滤器的URL模式

return registration;

}

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public class ParameterFilter implements Filter{

@Override

public void doFilter(ServletRequest request,ServletResponse response,FiterChain chain) {

Appcontext.setRequestStartTime(new Date());//1记录进口时间，最开始时间

//2，设置请求id，用于日志打印，一个请求的唯一标识，同时把这个requestId存起来，方便各个地方使用

String requestId =Constant.REQUEST_ID_STYLE+Utils.uuid().substring(0,15);

MDC.put("requestId",requestId);

AppContext.setRequestThreadId(requestId);

//改造request

HttpServletRequestWrapper requestWrapper = new HttpServletRequestWrapper((HttpServletRequest) request);

HttpServletResponseWrapper responseWrapper = new HttpServletResponseWrapper((HttpServletResponse ) response);

String uri = requestWrapper.getRequestURI();

String token =requestWrapper.getHeader("token");

String deviceId = requestWrapper.getHeader("deviceId");

String version= requestWrapper.getHeader("version");

if(StringUtils.inNotBlank(token)){

requestWrapper.addParameter("token",token);

}

if(StringUtils.inNotBlank(deviceId )){

requestWrapper.addParameter("deviceId ",deviceId );

}

f(StringUtils.inNotBlank(version)){

requestWrapper.addParameter("version",version);

}

  chain.doFilter(requestWrapper,responseWrapper);

}

来源：CSDN

作者：hooroom

链接：https://blog.csdn.net/weixin_41126842/article/details/86350583