HTTP Status 400,400 (Bad Request)
400 (Bad Request)
点击添加按钮转跳没反应,控制台没报错,然后在Chrome上检查发现报错了

百度了一下,发现http Status 400这个错误大多是因为,jsp的form表单提交的字段类型和后台接收字段类型不匹配造成的(例如,form中为String,后台接收为Integer)
仔细对比了一下后台和数据库了的字段类型,果真如此,,,,,,,
参考资料: https://www.cnblogs.com/hhhaisen/p/7885639.html
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