刚接触Ajax，创建了jsp文件发现错误
必备软件：tomcat(从apache的官方网站上下载一个，我的是apache-tomcat-8.0.28)
需要下载tomcatPluginV321.zip 解压后放在eclipseplugins目录 下载地址： 点击打开链接
可能遇到的错误：
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,INCLUDING,
BUT NOTLIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESSFOR A PARTICULAR PURPOSE ARE DISCLAIMED.....(后面有解决的方法)
Several ports (8005, 8080, 8009) required by Tomcat v7.0 Server at localhost are already in use.
The server may already be running in another process, or a system process may be using the port.
To start this server you will need to stop the other process or change the port number(s)（后面有解决的方法）
接下来一步步解决：
一、 由于我的是Java
不是javaEE 所以得先安装javaEE插件，点击help -->install New Software 我版本的Work
With 为：Mars - http://download.eclipse.org/releases/mars(根据自己版本对应选)
然后选择下图中
勾选 JST Server Adapters JST Server Adapters Extensions JST Server UI 及 WST Server Adapters 安装即可
二、 Windows->preferences,找到Tomcat选项
如果找不到Tomact选项：这是因为的tomcatPluginV321.zip解压后文件的问题
解压出来的这个jar文件要单独放在eclipseplugins目录
如果放在文件夹里面是不会出现三只猫的
如果你找到了Tomact选项：
我的版本是8.0.28，可以选择Version7.x（没毛病）
点击ok
点击第一只猫会出现下面配置成功的信息：
三、 配置Server选项，找到 Windows->preferences->Server->Server runtime environment
这时你的版本是8的（我的是8.0.28）你必须选择v8.0否则你匹配不到，点击Next
四（解决出现的问题）、现在基本已经配置完成，接下来还有一些细节需要解决：
如果你出现了下面的错误
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOTLIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESSFOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THECOPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVERCAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICTLIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING INANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THEPOSSIBILITY OF SUCH DAMAGE.
选择Apache Tomcat v8.0 ...
如果你遇到这个问题Several ports (8005, 8080, 8009) required by Tomcat v7.0 Server at localhost are already in use. The server may already be running in another process,
or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s)
上网查说端口被占用了，你把另外的tomcat关闭，如果找不到，则打开任务管理器，结束"javaw.exe"这个进程
反正我的任务管理器找不到"javaw.exe"这个进程
但是你可以参照下面
如果不行的话， 运行cmd 输入netstat -ano|findstr 8080
然后输入 taskkill /pid 11732 /f
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