tomcat 7 中的类加载器学习

    

      /*
      

       * Licensed to the Apache Software Foundation (ASF) under one or more
      

       * contributor license agreements. See the NOTICE file distributed with
      

       * this work for additional information regarding copyright ownership.
      

       * The ASF licenses this file to You under the Apache License, Version 2.0
      

       * (the "License"); you may not use this file except in compliance with
      

       * the License. You may obtain a copy of the License at
      

       *
      

       * http://www.apache.org/licenses/LICENSE-2.0
      

       *
      

       * Unless required by applicable law or agreed to in writing, software
      

       * distributed under the License is distributed on an "AS IS" BASIS,
      

       * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      

       * See the License for the specific language governing permissions and
      

       * limitations under the License.
      

       */
      

      package org.apache.catalina.loader;
    
    
    

      import java.io.File;
      

      import java.io.IOException;
      

      import java.net.URL;
      

      import java.net.URLClassLoader;
      

      import java.util.HashMap;
      

      import java.util.List;
      

      import java.util.Map;
    
    
    

      import javax.servlet.ServletException;
      

      import javax.servlet.http.HttpServlet;
      

      import javax.servlet.http.HttpServletRequest;
      

      import javax.servlet.http.HttpServletResponse;
    
    
    

      

      import org.junit.Assert;
      

      import org.junit.Test;
      

      import org.apache.catalina.core.StandardContext;
      

      import org.apache.catalina.startup.Tomcat;
      

      import org.apache.catalina.startup.TomcatBaseTest;
      

      import org.apache.tomcat.util.buf.ByteChunk;
    
    
    

      public class TestWebappClassLoader extends TomcatBaseTest {
    
    
    

       @Test
      

       public void testGetURLs() throws Exception {
    
    
    

      File f = new File("test/webresources/war-url-connection.war");
    
    
    

       String[] expected = new String[2];
      

       String warUrl = f.toURI().toURL().toExternalForm();
      

       expected[0] = "jar:" + warUrl + "!/WEB-INF/classes/";
      

       expected[1] = "jar:" + warUrl + "!/WEB-INF/lib/test.jar";
    
    
    

       Tomcat tomcat = getTomcatInstance();
      

       // Must have a real docBase - just use temp
      

       StandardContext ctx =
      

       (StandardContext)tomcat.addContext("", f.getAbsolutePath());
    
    
    

      tomcat.start();
    
    
    

       //获得当前的类加载器
      

       ClassLoader cl = ctx.getLoader().getClassLoader();
      

      

    
    
    

       Assert.assertTrue(cl instanceof URLClassLoader);
      

       //获得类加载器中对应的路径
    
    
    

       try (URLClassLoader ucl = (URLClassLoader) cl) {
      

       URL[] urls = ucl.getURLs();
      

       Assert.assertEquals(expected.length, urls.length);
      

       String[] actual = new String[urls.length];
      

       for (int i = 0; i < urls.length; i++) {
      

       actual[i] = urls[i].toExternalForm();
      

       System.out.println(actual[i]);
      

       }
      

       Assert.assertArrayEquals(expected, actual);
      

       //获得类加载器的各级父类加载器
      

       while(cl!=null)
      

       {
      

       System.out.println(cl);
      

       cl=cl.getParent();
      

      

       }
      

      

      

       }
      

       }
      

       @Test
      

       public void testBug53454() throws Exception {
      

       Tomcat tomcat = getTomcatInstance();
    
    
    

       // Must have a real docBase - just use temp
      

       StandardContext ctx = (StandardContext)
      

       tomcat.addContext("", System.getProperty("java.io.tmpdir"));
      

       System.out.println("临时目录"+System.getProperty("java.io.tmdir"));
    
    
    

       // Map the test Servlet
      

       MyServlet largeBodyServlet = new MyServlet();
      

       Tomcat.addServlet(ctx, "MyServlet", largeBodyServlet);
      

       ctx.addServletMapping("/", "MyServlet");
    
    
    

      tomcat.start();
    
    
    

       Map<String,List<String>> resHeaders= new HashMap<>();
      

       int rc = headUrl("http://localhost:" + getPort() + "/", new ByteChunk(),
      

       resHeaders);
      

    
    
    

       Assert.assertEquals(HttpServletResponse.SC_OK, rc);
      

       ClassLoader cl=ctx.getClass().getClassLoader();
      

       while(cl!=null)
      

       {
      

       System.out.println(cl);
      

       cl=cl.getParent();
      

       }
      

      

      

       }
      

       private static class MyServlet extends HttpServlet {
    
    
    

       private static final long serialVersionUID = 1L;
      

    
    
    

       @Override
      

       protected void doGet(HttpServletRequest req, HttpServletResponse resp)
      

       throws ServletException, IOException {
      

      

      

       }
      

      

       }
      

       }
    
    
    

       
    
    
      
         
      
    
  

      
        临时目录null


      
      
        

sun.misc.Launcher$AppClassLoader@4bb8d481

sun.misc.Launcher$ExtClassLoader@538787fd


      
      
        

jar:file:
      
      /F:/javal/Tomcat-Research-trunk/test/webresources/war-url-connection.war!/WEB-INF/classes/
      
        

jar:file:
      
      /F:/javal/Tomcat-Research-trunk/test/webresources/war-url-connection.war!/WEB-INF/lib/
      
        test.jar

WebappClassLoader

  context: 

  delegate: 
      
      
        false
      
      

---------->
      
         Parent Classloader:

sun.misc.Launcher$AppClassLoader@4bb8d481



sun.misc.Launcher$AppClassLoader@4bb8d481

sun.misc.Launcher$ExtClassLoader@538787fd

一月 
      
      26, 2015 6:52:56
      
         下午 org.apache.coyote.AbstractProtocol stop

INFO: Stopping ProtocolHandler [
      
      "http-nio-127.0.0.1-auto-2-64075"
      
        ]

一月 
      
      26, 2015 6:52:56
      
         下午 org.apache.coyote.AbstractProtocol destroy

INFO: Destroying ProtocolHandler [
      
      "http-nio-127.0.0.1-auto-2-64075"]