eclipse/myeclipse反编译插件非常好用，直接看源码

安装方法：Download and unzip the JD-Eclipse Update Site, Launch Eclipse, Click on "Help > Install New Software...", Click on button "Add..." to add an new repository, Enter "JD-Eclipse Update Site" and select the local site directory, Check "Java Decompiler Eclipse Plug-in", Next, next, next... and restart Eclipse.