class 类与jar 包的动态加载

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前段时间要使用class 类与jar 包的动态加载,在网络上找了很多资料，都不完整，现在我把简单整理与修改后的代码贴出来供大家参考, 如果有错误，请大家指出，：）

jar 包加载

package com.sms.util; import java.net.URLClassLoader; import java.net.URL; import java.io.File; import java.io.IOException;   public class NewClassLoader     extends URLClassLoader {   public NewClassLoader() {     super(new URL[0], ClassLoader.getSystemClassLoader());   }   public void addPath(String paths) {     if (paths == null || paths.length() <= 0) {       return;     }     String separator = System.getProperty("path.separator");     String[] pathToAdds = paths.split(separator);     for (int i = 0; i < pathToAdds.length; i++) {       if (pathToAdds[i] != null && pathToAdds[i].length() > 0) {         try {           File pathToAdd = new File(pathToAdds[i]).getCanonicalFile();           System.out.println(pathToAdd.toURL());           addURL(pathToAdd.toURL());         }         catch (IOException e) {           Constants.exceptionHandling(e);         }       }     }   } }

 

类加载

import java.net.URLClassLoader; import java.net.URL; import java.io.File; import java.io.IOException;   public class NewClassLoader     extends URLClassLoader {   public NewClassLoader() {     super(new URL[0], ClassLoader.getSystemClassLoader());   }   public void addPath(String paths) {     if (paths == null || paths.length() <= 0) {       return;     }     String separator = System.getProperty("path.separator");     String[] pathToAdds = paths.split(separator);     for (int i = 0; i < pathToAdds.length; i++) {       if (pathToAdds[i] != null && pathToAdds[i].length() > 0) {         try {           File pathToAdd = new File(pathToAdds[i]).getCanonicalFile();           System.out.println(pathToAdd.toURL());           addURL(pathToAdd.toURL());         }         catch (IOException e) {           Constants.exceptionHandling(e);         }       }     }   } }