Spring源码学习之：ClassLoader学习（5）-自测

【一】测试目的（ClassLoader的作用）

1：测试涉及三个jar包，nonbankcard-configure-0.0.1-SNAPSHOT.jar，nonbankcard-persist-0.0.1-SNAPSHOT.jar，fastjson-1.2.8.sec01.jar

2：将这三个jar包放在指定的目录里（/usr/sxf/testcls）

3：在项目中编辑类加载的jar，加载到内存中，执行jar包中的方法

【二】测试代码

1：nonbankcard-persist-0.0.1-SNAPSHOT.jar中的代码

 package org.nonbankcard.persist;

 /**

  * 该类会在nonbankcard-configure-0.0.1-SNAPSHOT.jar类中被引用

  * @author sxf

  *

  */

 public class SxfApp {

     private String name;

     private String age;

     private String dos;

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public String getAge() {

         return age;

     }

     public void setAge(String age) {

         this.age = age;

     }

     public String getDos() {

         return dos;

     }

     public void setDos(String dos) {

         this.dos = dos;

     }

 }

2:nonbankcard-configure-0.0.1-SNAPSHOT.jar 中的代码

 package com.nonbank.sxf.test.cls;

 import java.util.ArrayList;

 import java.util.List;

 import org.nonbankcard.persist.SxfApp;

 import com.alibaba.fastjson.JSON;

 /**

  * 该类中的代码引用了

  * =>nonbankcard-persist-0.0.1-SNAPSHOT.jar中的代码

  * =>fastjson-1.2.8.sec01.jar中的代码

  * =>本jar包中的User类

  * @author sxf

  *

  */

 public class SxfTestUtils {

     /**

      * 静态方法

      * @param list

      * @return

      */

     public static String formatList(List<String> list){

         List<User> userList=new ArrayList<User>();

         List<SxfApp> apps=new ArrayList<SxfApp>();

         for(String str:list){

             User u=JSON.parseObject(str, User.class);

             userList.add(u);

         }

         for(User usr:userList){

             System.out.println("SxfTestUtils.formatList()"+usr.getName());

             System.out.println("SxfTestUtils.formatList()"+usr.getAge());

             System.out.println("SxfTestUtils.formatList()"+usr.getDos());

             SxfApp sxfApp=new SxfApp();

             sxfApp.setName(usr.getName());

             sxfApp.setAge(usr.getAge());

             sxfApp.setDos(usr.getDos());

             apps.add(sxfApp);

         }

         StringBuilder builder=new StringBuilder();

         for(SxfApp app:apps){

             builder.append("@").append("姓名==>[").append(app.getName()).append("]年龄==>[").append(app.getAge()).append("]");

             builder.append("喜欢做的事情==>[").append(app.getDos()).append("]");

         }

         return builder.toString().substring(1);

     }

     /**

      * 非静态方法

      * @param list

      * @return

      */

     public String formatEx(List<String> list){

         List<User> userList=new ArrayList<User>();

         List<SxfApp> apps=new ArrayList<SxfApp>();

         for(String str:list){

             User u=JSON.parseObject(str, User.class);

             userList.add(u);

         }

         for(User usr:userList){

             System.out.println("SxfTestUtils.formatList()"+usr.getName());

             System.out.println("SxfTestUtils.formatList()"+usr.getAge());

             System.out.println("SxfTestUtils.formatList()"+usr.getDos());

             SxfApp sxfApp=new SxfApp();

             sxfApp.setName(usr.getName());

             sxfApp.setAge(usr.getAge());

             sxfApp.setDos(usr.getDos());

             apps.add(sxfApp);

         }

         StringBuilder builder=new StringBuilder();

         for(SxfApp app:apps){

             builder.append("@").append("姓名==>[").append(app.getName()).append("]年龄==>[").append(app.getAge()).append("]");

             builder.append("喜欢做的事情==>[").append(app.getDos()).append("]");

         }

         return builder.toString().substring(1);

     }

     /**

      * 非静态方法

      * @param str

      * @return

      */

     public String sxf(String str){

         System.out.println("SxfTestUtils.sxf(aaaaaaaaaaaaaaaaaaaaaaaaaaaa)");

         return "记载======>"+str;

     }

 }

3:测试类

 package org.nonbankcard.commons;

 import java.io.File;

 import java.io.FileFilter;

 import java.lang.reflect.Constructor;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.net.MalformedURLException;

 import java.net.URL;

 import java.net.URLClassLoader;

 import java.util.ArrayList;

 import java.util.List;

 import org.mvel2.util.ThisLiteral;

 /**

  *

  * @author sxf

  *

  */

 public class SxfTestClass {

     private final String CLASS_NAME="com.nonbank.sxf.test.cls.SxfTestUtils";

     //工具类对应的对象

     private Object object=null;

     //格式化的方法对象，静态。List作为形参

     private Method formatListMethod=null;

     //非静态的方法对象。List作为形参

     private Method formatExMethod=null;

     //非静态的方法对象。String作为形参

     private Method sxfMehod=null;

     /**

      * 构造函数中，加载指定路径的jar包。调用jar包中的方法

      * @throws MalformedURLException

      * @throws ClassNotFoundException

      * @throws NoSuchMethodException

      * @throws SecurityException

      * @throws InstantiationException

      * @throws IllegalAccessException

      * @throws IllegalArgumentException

      * @throws InvocationTargetException

      */

     public SxfTestClass() throws MalformedURLException, ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{

         //jar包所在目录

         File file=new File("/usr/sxf/testcls");

         //加载目录下所有的jar文件

         File[] files=file.listFiles(new FileFilter() {

             public boolean accept(File pathname) {

                 String name = pathname.getName().toLowerCase();

                 System.out.println("SxfTestClass.enclosing_method()"+name);

                  return name.endsWith("jar");

             }

         });

         //classLoarder加载

         URL[] urls = new URL[files.length];

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

               urls[i] = new URL("file",null,files[i].getAbsolutePath());

          }

          //将jar包全部加载到classLoader中

          ClassLoader classLoader = new URLClassLoader(urls, null);

          //反射生成jar包中的类的对象，和要执行方法的对象

          Class cls=classLoader.loadClass(CLASS_NAME);

          //构造函数

          Constructor constructor    = cls.getConstructor(new Class[]{});

          //反射生成对象

          this.object=constructor.newInstance(new Object[]{});

          //反射生成要执行方法的对象

          this.formatListMethod=cls.getDeclaredMethod("formatList",new Class[] {List.class});

          this.formatExMethod=cls.getDeclaredMethod("formatEx", new Class[] {List.class});

          this.sxfMehod=cls.getDeclaredMethod("sxf",  new Class[] {String.class});

     }

     public static void main(String[] args) throws MalformedURLException, ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {

         SxfTestClass sxfTestClass=new SxfTestClass();

         sxfTestClass.testclassLoader();

     }

     /**

      * 静态，非静态的方法都可被执行

      * @throws IllegalAccessException

      * @throws IllegalArgumentException

      * @throws InvocationTargetException

      *

      */

     public void testclassLoader() throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{

         String a="{'name':'ddd','age':'28','dos':'学些写java代码'}";

         String b="{'name':'eee','age':'28','dos':'打篮球'}";

         List<String> list=new ArrayList<String>();

         list.add(a);

         list.add(b);

         Object strObject=formatListMethod.invoke(object, list);

         System.out.println("SxfTestClass.testclassLoader()"+strObject);

         System.out.println("================================");

         Object strObject2=formatExMethod.invoke(this.object, list);

         System.out.println("SxfTestClass.testclassLoader()"+strObject2);

         System.out.println("================================");

         Object object=sxfMehod.invoke(this.object, "东");

         System.out.println("SxfTestClass.testclassLoader()"+object);

     }

     /**

      *

 测试结果：

 SxfTestClass.enclosing_method()nonbankcard-configure-0.0.1-snapshot.jar

 SxfTestClass.enclosing_method()nonbankcard-persist-0.0.1-snapshot.jar

 SxfTestClass.enclosing_method()fastjson-1.2.8.sec01.jar

 SxfTestUtils.formatList()ddd

 SxfTestUtils.formatList()28

 SxfTestUtils.formatList()学些写java代码

 SxfTestUtils.formatList()eee

 SxfTestUtils.formatList()28

 SxfTestUtils.formatList()打篮球

 SxfTestClass.testclassLoader()姓名==>[ddd]年龄==>[28]喜欢做的事情==>[学些写java代码]@姓名==>[eee]年龄==>[28]喜欢做的事情==>[打篮球]

 ================================

 SxfTestUtils.formatList()ddd

 SxfTestUtils.formatList()28

 SxfTestUtils.formatList()学些写java代码

 SxfTestUtils.formatList()eee

 SxfTestUtils.formatList()28

 SxfTestUtils.formatList()打篮球

 SxfTestClass.testclassLoader()姓名==>[ddd]年龄==>[28]喜欢做的事情==>[学些写java代码]@姓名==>[eee]年龄==>[28]喜欢做的事情==>[打篮球]

 ================================

 SxfTestUtils.sxf(aaaaaaaaaaaaaaaaaaaaaaaaaaaa)

 SxfTestClass.testclassLoader()记载======>东

      */

 }

【三】测试结果

1:执行目录必须存在，要调用方法依赖的所有jar包，否则会抛出异常

巴特西

Spring源码学习之：ClassLoader学习（5）-自测

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