[2.1 maven的配置](2.1maven%E7%9A%84%E9%85%8D%E7%BD%AE.md) [2.2 Cookie](2.2Cookie.md) [2.3 EL表达式 JSTL](2.3EL%E8%A1%A8%E8%BE%BE%E5%BC%8FJSTL.md) [2.4 验证相关](2.4%E9%AA%8C%E8%AF%81%E7%9B%B8%E5%85%B3.md) [2.5 防重复提交](2.5%E9%98%B2%E9%87%8D%E5%A4%8D%E6%8F%90%E4%BA%A4.md) [2.6 activeMq的使用](2.6activeMq%E7%9A%84%E4%BD%BF%E7%94%A8.md) [2.7 jtl的使用](2.7jtl%E7%9A%84%E4%BD%BF%E7%94%A8.md) [2.8 Upload上传文件](2.8Upload%E4%B8%8A%E4%BC%A0%E6%96%87%E4%BB%B6.md)