带有默认 LoggingFilter 的日志语句

现在，如果我们尝试在没有 CustomLoggingFilter 的情况下使用任何现有的 REST API，日志将以这种方式显示。

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

默认情况下，Jersey 使用 JUL 进行日志记录，并且不在日志中打印请求/响应实体主体。
要打印实体内容，我们必须创建自己的 LoggingFiler，并注册它来代替默认的 org.glassfish.jersey.filter.LoggingFilter。
在这个例子中，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。

注册 CustomLoggingFilter

要注册此 CustomLoggingFilter，请以这种方式注册。

package com.onitroad.jersey;
import org.glassfish.jersey.jackson.JacksonFeature;
import org.glassfish.jersey.server.ResourceConfig;
import com.onitroad.jersey.provider.CustomLoggingFilter;
public class CustomApplication extends ResourceConfig 
{
	public CustomApplication() 
	{
		packages("com.onitroad.jersey");
		register(JacksonFeature.class);
		register(CustomLoggingFilter.class);
	}
}

创建自定义日志过滤器

让我们直接进入这个球衣演示的自定义日志过滤器类。

package com.onitroad.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());
	}
}

使用 CustomLoggingFilter 记录语句

添加 CustomLoggingFilter后，我们将获得更好的日志，如下所示。

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":"JackLi Kolenchiskey"}
HTTP RESPONSE : Header: {Content-Type=[application/json]} - Entity: Employee [id=2, name=JackLi Kolenchiskey]