JBE - Java Bytecode Editor
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JBE is a bytecode editor suitable for viewing and modifying java class files. It is built on top of the open-source jclasslib bytecode viewer by ej-technologies. For verification and exporting the class files, JBE uses the the Bytecode Engineering Library by Apache's Jakarta project.
JBE是一个字节码编辑器，适合查看与编辑java class文件。它是et-technologies公司开发的建立在开源的jclasslib bytecode viewer之上的。用来检验和导出字节码class文件的。JBE用Apache公司的Jakarta项目的BytecodeEngineering Library库。
- JBE requires Java 1.5 to run.--JBE需要java1.5的环境运行，貌似我的1.7也可以哦！
- It uses the standard mnemonics for JVM opcodes as instruction names. Jumps are absolute, labels are shown as line numbers. The cases/targets of tableswitch and lookupswitch instructions should be preceded by a tab or a space.--它用了jvm标准的操作码助记符名称。跳跃是绝对的,标签显示为行号。例如tableswitch和lookupswitch目标指令前面是一个Tab制表符或者一个空格space。
- Class names should be written using the Java class file format conventions, so java.lang.String becomes java/lang/String—类名按照java类文件格式惯例，所以java.lang.String类就变成了java/lang/String。
- Type information is also written as they appear in class files (e.g. the descriptor I speficies an integer, [Ljava/lang/Thread; is an array of Threads, etc.).-->类型信息按照他们在类文件中样子写出来。例如描述给I变量指定为整型integer，[Ljava/lang/Thread是一个线程的数组等等。
- To add a constant, method, interface or field, select the appropriate section in the left pane. A form for adding the appropriate attribute is displayed on the main pane.--> 选择软件左边面板中合适的章节可以添加常量，方法，接口或者字段。主面板显示了添加合适属性的表格。
- To remove a constant, method, interface or a field, select it in the left pane. A delete button appears on the main pane.—>选中左边面板中的常量，方接口或者字段，主面板中出现一个删除按钮，可以删除他们。
- To add or remove an exception select the method's exception table tab. There, a form is included for adding an exception. An exception can be removed via the delete button.-->想要添加或者移除一个异常，选中方法异常表标签，然后出现一个可以添加异常的表格。一个异常可以通过点击删除按钮的方法移除。
- There is no global save, all changes are directly applied to the class file after adding/deleting/modifying attributes. To return to the original file, select the appropariate menu item or button ("Revert to original class file").-->没有全局的保存，在添加/删除/修改属性后，所有的改变直接应用到class文件。选中合适的菜单项或者按钮, 返回原始的文件。
Download: Java Bytecode Editor 0.1.1
Changes from 0.1b:
- fix for saving InvokeInterface instruction by Carl Rumachik
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下面写一个HelloWorld程序：类文件如下：
public class HelloWorld{
public static void main(String args[]){
System.out.println("hello,world");
}
}
启动cmd命令窗口
可以看到类文件没有错误编译运行通过，下一步我想通过直接修改字节码中的hello,world
打开jbe软件，打开编译出来的class文件
将"hello,world"换成“你好，世界"，点击保存（save method）按钮
回到命令行直接运行刚刚的class文件查看输出是否已经如我们所料。
