Spring源码学习之：ClassLoader学习（5）-自测-白红宇

【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

1 package org.nonbankcard.persist; 2 /** 3  * 该类会在nonbankcard-configure-0.0.1-SNAPSHOT.jar类中被引用 4  * @author sxf 5  * 6  */ 7 public class SxfApp { 8     private String name; 9     private String age;10     private String dos;11     public String getName() {12         return name;13     }14     public void setName(String name) {15         this.name = name;16     }17     public String getAge() {18         return age;19     }20     public void setAge(String age) {21         this.age = age;22     }23     public String getDos() {24         return dos;25     }26     public void setDos(String dos) {27         this.dos = dos;28     }29     30 }

View Code

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

1 package com.nonbank.sxf.test.cls; 2  3 import java.util.ArrayList; 4 import java.util.List; 5  6 import org.nonbankcard.persist.SxfApp; 7  8 import com.alibaba.fastjson.JSON; 9 /**10  * 该类中的代码引用了11  * =>nonbankcard-persist-0.0.1-SNAPSHOT.jar中的代码12  * =>fastjson-1.2.8.sec01.jar中的代码13  * =>本jar包中的User类14  * @author sxf15  *16  */17 public class SxfTestUtils {18 19     /**20      * 静态方法21      * @param list22      * @return23      */24     public static String formatList(List
      
        list){25         List
       
         userList=new ArrayList
        
         ();26         List
         
           apps=new ArrayList
          
           ();27         for(String str:list){28             User u=JSON.parseObject(str, User.class);29             userList.add(u);30         }31         for(User usr:userList){32             System.out.println("SxfTestUtils.formatList()"+usr.getName());33             System.out.println("SxfTestUtils.formatList()"+usr.getAge());34             System.out.println("SxfTestUtils.formatList()"+usr.getDos());35             SxfApp sxfApp=new SxfApp();36             sxfApp.setName(usr.getName());37             sxfApp.setAge(usr.getAge());38             sxfApp.setDos(usr.getDos());39             apps.add(sxfApp);40         }41         42         StringBuilder builder=new StringBuilder();43         for(SxfApp app:apps){44             builder.append("@").append("姓名==>[").append(app.getName()).append("]年龄==>[").append(app.getAge()).append("]");45             builder.append("喜欢做的事情==>[").append(app.getDos()).append("]");46         }47         return builder.toString().substring(1);48     }49     50     /**51      * 非静态方法52      * @param list53      * @return54      */55     public String formatEx(List
           
             list){56 List
            
              userList=new ArrayList
             
              ();57 List
              
                apps=new ArrayList
               
                ();58 for(String str:list){59 User u=JSON.parseObject(str, User.class);60 userList.add(u);61 }62 for(User usr:userList){63 System.out.println("SxfTestUtils.formatList()"+usr.getName());64 System.out.println("SxfTestUtils.formatList()"+usr.getAge());65 System.out.println("SxfTestUtils.formatList()"+usr.getDos());66 SxfApp sxfApp=new SxfApp();67 sxfApp.setName(usr.getName());68 sxfApp.setAge(usr.getAge());69 sxfApp.setDos(usr.getDos());70 apps.add(sxfApp);71 }72 73 StringBuilder builder=new StringBuilder();74 for(SxfApp app:apps){75 builder.append("@").append("姓名==>[").append(app.getName()).append("]年龄==>[").append(app.getAge()).append("]");76 builder.append("喜欢做的事情==>[").append(app.getDos()).append("]");77 }78 return builder.toString().substring(1);79 }80 81 /**82 * 非静态方法83 * @param str84 * @return85 */86 public String sxf(String str){87 System.out.println("SxfTestUtils.sxf(aaaaaaaaaaaaaaaaaaaaaaaaaaaa)");88 return "记载======>"+str;89 }90 }

View Code

3:测试类

1 package org.nonbankcard.commons;  2   3 import java.io.File;  4 import java.io.FileFilter;  5 import java.lang.reflect.Constructor;  6 import java.lang.reflect.InvocationTargetException;  7 import java.lang.reflect.Method;  8 import java.net.MalformedURLException;  9 import java.net.URL; 10 import java.net.URLClassLoader; 11 import java.util.ArrayList; 12 import java.util.List; 13  14 import org.mvel2.util.ThisLiteral; 15 /** 16  *  17  * @author sxf 18  * 19  */ 20 public class SxfTestClass { 21      22     private final String CLASS_NAME="com.nonbank.sxf.test.cls.SxfTestUtils"; 23     //工具类对应的对象 24     private Object object=null; 25     //格式化的方法对象，静态。List作为形参 26     private Method formatListMethod=null; 27     //非静态的方法对象。List作为形参 28     private Method formatExMethod=null; 29     //非静态的方法对象。String作为形参 30     private Method sxfMehod=null; 31      32      33      34      35     /** 36      * 构造函数中，加载指定路径的jar包。调用jar包中的方法 37      * @throws MalformedURLException 38      * @throws ClassNotFoundException 39      * @throws NoSuchMethodException 40      * @throws SecurityException 41      * @throws InstantiationException 42      * @throws IllegalAccessException 43      * @throws IllegalArgumentException 44      * @throws InvocationTargetException 45      */ 46     public SxfTestClass() throws MalformedURLException, ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{ 47         //jar包所在目录 48         File file=new File("/usr/sxf/testcls"); 49          50         //加载目录下所有的jar文件 51         File[] files=file.listFiles(new FileFilter() { 52             public boolean accept(File pathname) { 53                 String name = pathname.getName().toLowerCase();    54                 System.out.println("SxfTestClass.enclosing_method()"+name); 55                  return name.endsWith("jar");    56             } 57         }); 58         //classLoarder加载 59         URL[] urls = new URL[files.length];      60          for(int i = 0; i < files.length; i++) {    61               urls[i] = new URL("file",null,files[i].getAbsolutePath());    62          } 63          //将jar包全部加载到classLoader中 64          ClassLoader classLoader = new URLClassLoader(urls, null); 65           66          //反射生成jar包中的类的对象，和要执行方法的对象 67          Class cls=classLoader.loadClass(CLASS_NAME); 68          //构造函数 69          Constructor constructor    = cls.getConstructor(new Class[]{}); 70          //反射生成对象 71          this.object=constructor.newInstance(new Object[]{}); 72          //反射生成要执行方法的对象 73          this.formatListMethod=cls.getDeclaredMethod("formatList",new Class[] {List.class}); 74          this.formatExMethod=cls.getDeclaredMethod("formatEx", new Class[] {List.class}); 75          this.sxfMehod=cls.getDeclaredMethod("sxf",  new Class[] {String.class}); 76           77     } 78  79     public static void main(String[] args) throws MalformedURLException, ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException { 80         SxfTestClass sxfTestClass=new SxfTestClass(); 81         sxfTestClass.testclassLoader(); 82     } 83      84     /** 85      * 静态，非静态的方法都可被执行 86      * @throws IllegalAccessException 87      * @throws IllegalArgumentException 88      * @throws InvocationTargetException 89      *  90      */ 91     public void testclassLoader() throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{ 92         String a="{'name':'ddd','age':'28','dos':'学些写java代码'}"; 93         String b="{'name':'eee','age':'28','dos':'打篮球'}"; 94         List
      
        list=new ArrayList
       
        (); 95         list.add(a); 96         list.add(b); 97         Object strObject=formatListMethod.invoke(object, list); 98         System.out.println("SxfTestClass.testclassLoader()"+strObject); 99         100         System.out.println("================================");101         102         Object strObject2=formatExMethod.invoke(this.object, list);103         System.out.println("SxfTestClass.testclassLoader()"+strObject2);104         105         System.out.println("================================");106         107         Object object=sxfMehod.invoke(this.object, "东");108         System.out.println("SxfTestClass.testclassLoader()"+object);109         110     }111     112     113     /**114      * 115 测试结果：116 SxfTestClass.enclosing_method()nonbankcard-configure-0.0.1-snapshot.jar117 SxfTestClass.enclosing_method()nonbankcard-persist-0.0.1-snapshot.jar118 SxfTestClass.enclosing_method()fastjson-1.2.8.sec01.jar119 SxfTestUtils.formatList()ddd120 SxfTestUtils.formatList()28121 SxfTestUtils.formatList()学些写java代码122 SxfTestUtils.formatList()eee123 SxfTestUtils.formatList()28124 SxfTestUtils.formatList()打篮球125 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]126 ================================127 SxfTestUtils.formatList()ddd128 SxfTestUtils.formatList()28129 SxfTestUtils.formatList()学些写java代码130 SxfTestUtils.formatList()eee131 SxfTestUtils.formatList()28132 SxfTestUtils.formatList()打篮球133 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]134 ================================135 SxfTestUtils.sxf(aaaaaaaaaaaaaaaaaaaaaaaaaaaa)136 SxfTestClass.testclassLoader()记载======>东137 138      */139         140     141 }

View Code

【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