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2011年(1)

2008年(1050)

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2008-09-09 16:49:42

    动态调用 JAVA CLASS/JAR,不是难事。只是随便搜索了一下,没有完整的过程。於是,综合了一下,写不个综合的范例,以便提供参考。 目录结构: view plaincopy to clipboardprint?
{CURDIR}\DynamicLoad.java
       \{test}
        \testLoad.java

{CURDIR}\DynamicLoad.java
       \{test}
        \testLoad.java

testLoad.java 的源码: view plaincopy to clipboardprint?
package test;

public class testLoad{

    public static String testing(String name){
        return "Hello, "+name+"! I am a public static method, I will return a String.";
    }

    public static void main(String []argv){
        System.out.println("------------------------------Begin.");
        System.out.println("Hello, dynamac load class testing!");
        for(int i=0; i            System.out.println("argv["+(i)+"]="+argv[i]);
        System.out.println("------------------------------End.");
    }

}

package test;

public class testLoad{

    public static String testing(String name){
        return "Hello, "+name+"! I am a public static method, I will return a String.";
    }

    public static void main(String []argv){
        System.out.println("------------------------------Begin.");
        System.out.println("Hello, dynamac load class testing!");
        for(int i=0; i            System.out.println("argv["+(i)+"]="+argv[i]);
        System.out.println("------------------------------End.");
    }

}DynamicLoad.java的源码: view plaincopy to clipboardprint?
import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;


public class DynamicLoad extends URLClassLoader {

    public static void main(String[] args) throws Exception {

        dyn_load_class();
        dyn_load_jar();

    }

    public static void dyn_load_class() {
        File xFile = new File("test");  //指向class所在的目录
        URL xUrl;

        try {
            xUrl = xFile.toURL();
            URLClassLoader ClassLoader = new URLClassLoader(new URL[]{xUrl});
            Class cd = ClassLoader.loadClass("test.testLoad"); //class名(饱含包名)
            Field[] f = cd.getDeclaredFields();
            for (int k = 0; k < f.length; k++) {
                System.out.println(f[k]);
            }

            Method mainMethod = cd.getMethod("main", new Class[]{String[].class});
            String params[]={"aa","bb"};
            mainMethod.invoke(null, new Object[] {params});//执行 main 方法

             System.out.println("\n");

        } catch (Exception e) {
            e.printStackTrace();
        }

    }


    public static void dyn_load_jar() {
        DynamicLoad d = new DynamicLoad();
        d.addPath("ttest.jar"); //指向 .jar 具体路径
    }

    public DynamicLoad() {
        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();
                    addURL(pathToAdd.toURL());
                    System.out.println(pathToAdd.toURL());
                    Class c = this.loadClass("test.testLoad"); //class名(饱含包名)

                    Field[] f = c.getDeclaredFields();
                    for (int k = 0; k < f.length; k++) {
                        System.out.println(f[k]);
                    }

                    Method mainMethod = c.getMethod("testing", new Class[]{String.class});
                    String params="小橙子";
                    String ret=(String)mainMethod.invoke(null, params);//执行方法
                    System.out.println("test.testLoad.testing() return:"+ret);

                } catch (Exception e) {
                    e.printStackTrace();
                }

            }

        }

    }

}

import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;


 

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