# Jersey 使用过滤器记录请求和响应实体 > 原文： [https://howtodoinjava.com/jersey/jersey-custom-logging-request-and-response-entities-using-filter/](https://howtodoinjava.com/jersey/jersey-custom-logging-request-and-response-entities-using-filter/) 默认情况下，Jersey 使用 JUL 进行日志记录 - 不会在日志中打印请求/响应实体主体。 要打印实体内容，必须创建自己的`LoggingFiler`，并将其注册为默认值`org.glassfish.jersey.filter.LoggingFilter`。 在此示例中，我正在创建一个这样的基本`CustomLoggingFilter`，它扩展了`org.glassfish.jersey.filter.LoggingFilter`并实现了`ContainerRequestFilter`和`ContainerResponseFilter`接口，以便它可以拦截正在进行的请求和响应。 ```java Table of Contents Create CustomLoggingFilter Register CustomLoggingFilter Log statements with default LoggingFilter Log statements with CustomLoggingFilter ``` ## 创建`CustomLoggingFilter` 让我们直接转到此 Jersey 演示的自定义日志记录过滤器类。 ```java package com.howtodoinjava.jersey.provider; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import javax.ws.rs.container.ContainerRequestContext; import javax.ws.rs.container.ContainerRequestFilter; import javax.ws.rs.container.ContainerResponseContext; import javax.ws.rs.container.ContainerResponseFilter; import org.glassfish.jersey.filter.LoggingFilter; import org.glassfish.jersey.message.internal.ReaderWriter; public class CustomLoggingFilter extends LoggingFilter implements ContainerRequestFilter, ContainerResponseFilter { @Override public void filter(ContainerRequestContext requestContext) throws IOException { StringBuilder sb = new StringBuilder(); sb.append("User: ").append(requestContext.getSecurityContext().getUserPrincipal() == null ? "unknown" : requestContext.getSecurityContext().getUserPrincipal()); sb.append(" - Path: ").append(requestContext.getUriInfo().getPath()); sb.append(" - Header: ").append(requestContext.getHeaders()); sb.append(" - Entity: ").append(getEntityBody(requestContext)); System.out.println("HTTP REQUEST : " + sb.toString()); } private String getEntityBody(ContainerRequestContext requestContext) { ByteArrayOutputStream out = new ByteArrayOutputStream(); InputStream in = requestContext.getEntityStream(); final StringBuilder b = new StringBuilder(); try { ReaderWriter.writeTo(in, out); byte[] requestEntity = out.toByteArray(); if (requestEntity.length == 0) { b.append("").append("\n"); } else { b.append(new String(requestEntity)).append("\n"); } requestContext.setEntityStream( new ByteArrayInputStream(requestEntity) ); } catch (IOException ex) { //Handle logging error } return b.toString(); } @Override public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException { StringBuilder sb = new StringBuilder(); sb.append("Header: ").append(responseContext.getHeaders()); sb.append(" - Entity: ").append(responseContext.getEntity()); System.out.println("HTTP RESPONSE : " + sb.toString()); } } ``` ## 注册`CustomLoggingFilter` 要注册此`CustomLoggingFilter`，请以这种方式注册。 ```java package com.howtodoinjava.jersey; import org.glassfish.jersey.jackson.JacksonFeature; import org.glassfish.jersey.server.ResourceConfig; import com.howtodoinjava.jersey.provider.CustomLoggingFilter; public class CustomApplication extends ResourceConfig { public CustomApplication() { packages("com.howtodoinjava.jersey"); register(JacksonFeature.class); register(CustomLoggingFilter.class); } } ``` ## 使用默认`LoggingFilter`的日志语句 现在，如果您尝试使用不带`CustomLoggingFilter`的任何现有 REST API，日志将以这种方式显示。 **请求**  **日志** ```java Sep 30, 2015 6:18:41 PM org.glassfish.jersey.filter.LoggingFilter log INFO: 1 * Server has received a request on thread http-bio-8080-exec-4 1 > POST http://localhost:8080/JerseyDemos/rest/employees 1 > accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 1 > accept-encoding: gzip, deflate 1 > accept-language: null 1 > cache-control: no-cache 1 > connection: keep-alive 1 > content-length: 35 1 > content-type: application/json; charset=UTF-8 1 > host: localhost:8080 1 > pragma: no-cache 1 > user-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0 Sep 30, 2015 6:18:41 PM org.glassfish.jersey.filter.LoggingFilter log INFO: 1 * Server responded with a response on thread http-bio-8080-exec-4 1 < 200 1 < Content-Type: application/json ``` ## 使用`CustomLoggingFilter`的日志语句 添加`CustomLoggingFilter`后，您将获得更好的日志，如下所示。 ```java HTTP REQUEST : User: unknown - Path: employees - Header: {host=[localhost:8080], user-agent=[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0], accept=, accept-language=[null], accept-encoding=[gzip, deflate], content-type=[application/json; charset=UTF-8], content-length=[35], connection=[keep-alive], pragma=[no-cache], cache-control=[no-cache]} - Entity: {"id":2,"name":"Alex Kolenchiskey"} HTTP RESPONSE : Header: {Content-Type=[application/json]} - Entity: Employee [id=2, name=Alex Kolenchiskey] ``` 请根据需要随时从日志语句中添加/删除信息。 您可以在这些日志中添加许多其他有用的信息。 **祝您学习愉快！**