包含获取用户openid和同意支付下单获取prepay id的功能。module that contains fetching openid in WeChat, and unified order
使用Eclipse开发，gradle打包，打出来的jar包将不包含依赖的dom4j，所以项目中需要含有dom4j的jar包。
Kuikuis-MBP:WeChatPay kuikui$ gradle jar
:compileJava
:processResources
:classes
:jar
BUILD SUCCESSFUL
Total time: 4.833 secs
This build could be faster, please consider using the Gradle Daemon: https://docs.gradle.org/2.12/userguide/gradle_daemon.html
Kuikuis-MBP:WeChatPay kuikui$ ll build/libs/
total 56
drwxr-xr-x 4 kuikui staff 136 Apr 2 13:39 .
drwxr-xr-x 10 kuikui staff 340 Apr 1 16:59 ..
-rw-r--r--@ 1 kuikui staff 6148 Apr 1 21:27 .DS_Store
-rw-r--r-- 1 kuikui staff 18785 Apr 2 13:39 WeChatPay-1.0.jar
作者在Play framework下使用，将wechat.properties放在conf目录下即可