参考资料

• https://www.lynda.com/Java-tutorials/Java-Enterprise-Edition-Introduction/516591-2.html?utm_medium=affiliate&utm_source=CJ&utm_content=11926&utm_campaign=CD17318&bid=11926&AID=CD17318&AIDCJ=12316367&PIDCJ=8236816&SIDCJ=tweet-stream&subid1=8236816
• https://docs.oracle.com/javaee/7/tutorial/