构建Tomcat Embed测试环境

国庆假期，闲来无事，翻翻Tomcat 7的书籍，顺便总结一下

Tomcat 7 支持嵌入的Web容器，在本地测试环境或者本地应用场景下比较有用，类似于Jetty的功能，可能是Tomcat觉得自己这个方面有所缺失，在Tomcat 7当中就增加了该功能

下载好Tomcat 7 Embedded版本：

里面包含这几个Jar包：

tomcat-embed-core.jar  Tomcat核心类包，包含Tomcat Server的主要实现

tomcat-dbcp.jar Apache DBCP，用来在Tomcat实例中集成JDBC

tomcat-embed-jasper.jar Tomcat的JSP引擎

ecj-4.2.2.jar 来自Eclipse的JSP编译器，用来给Jasper引擎提供编译JSP文件使用

tomcat-embed-logging-juli.jar 集成JULI日志

tomcat-embed-logging-log4j.jar 集成Log4j日志

以测试一个Servlet为例：

import static org.junit.Assert.assertEquals;

import java.io.IOException;

import javax.servlet.ServletException;

import org.apache.catalina.Context;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.startup.Tomcat;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.xml.sax.SAXException;

public class TomcatServletTest {
	private Tomcat tomcat;

	@Before
	public void startTomcat() throws ServletException, LifecycleException {
		tomcat = new Tomcat();
		tomcat.setPort(8080);
		String tmpDirPath = System.getProperty("java.io.tmpdir");
		Context ctxt = this.tomcat.addContext("/sqrt", tmpDirPath);
		Tomcat.addServlet(ctxt, "servletTest", new ServletTest());
		ctxt.addServletMapping("/", "servletTest");
		this.tomcat.start();
	}

	@Test
	public void testSuccess() throws IOException, SAXException {
		CloseableHttpClient httpClient = HttpClients.createDefault();
		HttpGet httpget = new HttpGet("http://localhost:8080/sqrt/?number=49");
		CloseableHttpResponse response = httpClient.execute(httpget);
		try {
			response = httpClient.execute(httpget);
			HttpEntity entity = response.getEntity();
			System.out.println(EntityUtils.toString(entity));
			assertEquals("The result is 7.0", EntityUtils.toString(entity));
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				response.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	@After
	public void stopTomcat() throws LifecycleException {
		this.tomcat.stop();
	}

}

 

import java.io.IOException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletTest extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws IOException {
		Double input = Double.parseDouble(request.getParameter("number"));
		double result = Math.sqrt(input);
		String message = "The result is " + result;
		response.getOutputStream().write(message.getBytes());
	}

}