Servlet编程实例1
编程目的:使用JSP+servlet,来实现一个登陆页面,登陆成功则提示成功,登陆失败则提示失败。
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162424516-1937266018.png)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162425016-1872532594.png)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162426095-769738381.png)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162426860-625245951.png)
编程要求:登陆页面由login.jsp负责显示,登陆成功由success.jsp负责显示,登陆失败由error.jsp负责显示。逻辑判断和跳转交由servlet负责
核心代码如下:
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162424516-1937266018.png)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162425016-1872532594.png)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162426095-769738381.png)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162426501-666302963.png)
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162426860-625245951.png)
实验结果:
![](https://images2015.cnblogs.com/blog/1111680/201702/1111680-20170227162427329-1952427329.png)
通过页面显示结果和FireBug的结果我们可以看到,从login.jsp页面提交的表单信息发送给servlet,然后servlet响应请求,将页面重定向至succss.jsp,因为post方法不能缓存信息,而且重定向也没有提交表单,所以信息为null。