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README
LGPL-3.0

asmsupport

Build Status Maven central

English Version

一个Java字节码操作类库

asmsupport是一个字节码操作类库,它能够让程序员非常简单的在动态创建和修改类,该框架是基于asm开发的,不同与asm的是,它避免了直接操作jvm指令,栈和局部变量。更多内容可见文档

模块

模块 描述
asmsupport-thrid 这个模块的包含了asmsupport使用的第三方依赖包的源码,这些源码在asmsupport中都重新定义了命名空间,这样的好处就是实现零依赖,同时在开发过程中避免了因为使用asmsupport而产生包冲突
asmsupport-standard 这个模块是asmsupport的标准,可以基于这个api标准完成一个新的asmsupport的实现
asmsupport-core 这个模块是asmsupport-standard的一个核心实现
asmsupport-client 这个模块是对asmsupport-core的一个高层封装,实现了很多简便的方式,比如链式调用,同时也实现了asmsupport-standard标准.
asmsupport-issues 这个模块包含了所有asmsupport以往的issue的测试类,这个包的作用可以在后续开发中确保运行'maven test'的时候同一问题不再出现。
asmsupport-sample 这个模块包含了一些asmsupport的实例, 比如动态代理,json序列化等等.

Maven坐标

<dependency>
    <groupId>cn.wensiqun</groupId>
    <artifactId>asmsupport</artifactId>
    <version>x.x.x</version>
</dependency>

许可

ASMSupport使用的是GNU Lesser General Public License (LGPL)许可。

第一个例子

我们将使用ASMSupport生成如下代码:

public class FirstCase {
    
    public static void main(String[] args) {
        System.out.println("Hello ASMSupport.");
    }
    
}

下面是ASMSupport的代码:

DummyClass dummy = new DummyClass("FirstCase").public_()
       .newMethod("main").public_().static_().argTypes(String[].class)
       .body(new MethodBody(){
				public void body(LocalVariable... args) {
					getType(System.class).field("out").call("println", val("Hello ASMSupport."))
					return_();
				}
       });
Class<?> FirstCaseClass = dummy.build();
Method mainMethod = FirstCaseClass.getMethod("main", String[].class);
mainMethod.invoke(FirstCaseClass, mainMethod);

实例

在asmsupport-sample模块下提供了两种实例,1.json序列化,2.实现动态代理。

JSON的实例在包cn.wensiqun.asmsupport.sample.client.json下,运行cn.wensiqun.asmsupport.sample.client.json.demo.Runner类,在target/asmsupport-test-generated下查看生成的类。

Proxy的实例在包cn.wensiqun.asmsupport.sample.client.proxy下,运行cn.wensiqun.asmsupport.sample.client.proxy.demo.Runner类,在target/asmsupport-test-generated下查看生成的类。

GNU LESSER GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright © 2007 Free Software Foundation, Inc. <http://fsf.org/> Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below. 0. Additional Definitions. As used herein, “this License” refers to version 3 of the GNU Lesser General Public License, and the “GNU GPL” refers to version 3 of the GNU General Public License. “The Library” refers to a covered work governed by this License, other than an Application or a Combined Work as defined below. An “Application” is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. Defining a subclass of a class defined by the Library is deemed a mode of using an interface provided by the Library. A “Combined Work” is a work produced by combining or linking an Application with the Library. The particular version of the Library with which the Combined Work was made is also called the “Linked Version”. The “Minimal Corresponding Source” for a Combined Work means the Corresponding Source for the Combined Work, excluding any source code for portions of the Combined Work that, considered in isolation, are based on the Application, and not on the Linked Version. The “Corresponding Application Code” for a Combined Work means the object code and/or source code for the Application, including any data and utility programs needed for reproducing the Combined Work from the Application, but excluding the System Libraries of the Combined Work. 1. Exception to Section 3 of the GNU GPL. You may convey a covered work under sections 3 and 4 of this License without being bound by section 3 of the GNU GPL. 2. Conveying Modified Versions. If you modify a copy of the Library, and, in your modifications, a facility refers to a function or data to be supplied by an Application that uses the facility (other than as an argument passed when the facility is invoked), then you may convey a copy of the modified version: a) under this License, provided that you make a good faith effort to ensure that, in the event an Application does not supply the function or data, the facility still operates, and performs whatever part of its purpose remains meaningful, or b) under the GNU GPL, with none of the additional permissions of this License applicable to that copy. 3. Object Code Incorporating Material from Library Header Files. The object code form of an Application may incorporate material from a header file that is part of the Library. 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You may convey a Combined Work under terms of your choice that, taken together, effectively do not restrict modification of the portions of the Library contained in the Combined Work and reverse engineering for debugging such modifications, if you also do each of the following: a) Give prominent notice with each copy of the Combined Work that the Library is used in it and that the Library and its use are covered by this License. b) Accompany the Combined Work with a copy of the GNU GPL and this license document. c) For a Combined Work that displays copyright notices during execution, include the copyright notice for the Library among these notices, as well as a reference directing the user to the copies of the GNU GPL and this license document. d) Do one of the following: 0) Convey the Minimal Corresponding Source under the terms of this License, and the Corresponding Application Code in a form suitable for, and under terms that permit, the user to recombine or relink the Application with a modified version of the Linked Version to produce a modified Combined Work, in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source. 1) Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (a) uses at run time a copy of the Library already present on the user's computer system, and (b) will operate properly with a modified version of the Library that is interface-compatible with the Linked Version. e) Provide Installation Information, but only if you would otherwise be required to provide such information under section 6 of the GNU GPL, and only to the extent that such information is necessary to install and execute a modified version of the Combined Work produced by recombining or relinking the Application with a modified version of the Linked Version. (If you use option 4d0, the Installation Information must accompany the Minimal Corresponding Source and Corresponding Application Code. If you use option 4d1, you must provide the Installation Information in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source.) 5. Combined Libraries. You may place library facilities that are a work based on the Library side by side in a single library together with other library facilities that are not Applications and are not covered by this License, and convey such a combined library under terms of your choice, if you do both of the following: a) Accompany the combined library with a copy of the same work based on the Library, uncombined with any other library facilities, conveyed under the terms of this License. b) Give prominent notice with the combined library that part of it is a work based on the Library, and explaining where to find the accompanying uncombined form of the same work. 6. Revised Versions of the GNU Lesser General Public License. The Free Software Foundation may publish revised and/or new versions of the GNU Lesser General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. 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简介

当使用ASM编写的时候 很多情况下需要了解JVM底层的指令的, 并且需要对栈和本地变量显式的进行操作, 如果直接用ASM进行开发势必会付出更多的学习成本和时间成本,并且不易后期的维护。 此框架正好缓解了上述问题。使程序员编写字节码的时候更易于理解和开发,屏蔽了JVM指令以及栈和本地变量的操作,开发的时候更趋近于直接编写java程序。【企鹅讨论组:222545685】 展开 收起
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