重启tomcat上传文件丢失—tomcat在本机导致，实际部署是不会出现上传文件丢失的

吼吼，我遇到的问题是这样的……
我写了一个图片上传的方法，上传时，判断没有这个目录就自动建立一个。
然后开始上传图片，能成功，能在服务器找到文件夹和相应的文件。

但是，重启项目，或者清理缓存之后，图片和文件夹就会自动被删除，不见了。

先说解决办法吧，后面在分析：

1.把/tomcat/webapps/目录清空，删掉该文件夹的所有内容，
2.修改/tomcat/conf/web.xml文件:

[html] view plain copy

print ?

<servlet>
<servlet-name>default</servlet-name>
<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<init-param>
<param-name>listings</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet

<servlet>
        <servlet-name>default</servlet-name>
        <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>listings</param-name>
            <param-value>true</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet

3.修改/tomcat/conf/server.xml文件:

[html] view plain copy

print ?

<Host name=“localhost” appBase=“webapps”
unpackWARs=“true” autoDeploy=“true”
xmlValidation=“false” xmlNamespaceAware=“false”>
<!– SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html –>
<!–
<Valve className=”org.apache.catalina.authenticator.SingleSignOn” />
–>
<!– Access log processes all example.
Documentation at: /docs/config/valve.html –>
<!–
<Valve className=“org.apache.catalina.valves.AccessLogValve” directory=“logs”
prefix=“localhost_access_log.” suffix=“.txt” pattern=“common” resolveHosts=“false”/>
–>
<!—-><Context path=“/ser” docBase=“D:\project\myProject\editor\WebRoot”></Context>
<!–<Context path=”/mvc” docBase=”D:\project\myProject\你的项目名\WebRoot”></Context>–>
</Host>

<Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false">

        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"  
               prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>
        -->
<!----><Context path="/ser" docBase="D:\project\myProject\editor\WebRoot"></Context>
<!--<Context path="/mvc" docBase="D:\project\myProject\你的项目名\WebRoot"></Context>-->
      </Host>

分析：

重新redeploy的时候， tomcat 会同步你本地的文件，因为本地没有相应的文件夹导致文件丢失。
这只是在开发过程中会遇到的问题实际应用中 tomcat 只会 startup.bat/sh shutdown.bat/sh
我们这样做，其实就是给工程配置虚拟路径，这样tomcat在启动的时候直接找到工程了,
上传的图片就不会仅仅只在/tomcat/webapps/目录，而直接到了你的工程里,
不管你怎样重启项目，或者清理缓存，上传的文件依然存在!

            </div>

但是，重启项目，或者清理缓存之后，图片和文件夹就会自动被删除，不见了。

先说解决办法吧，后面在分析：

1.把/tomcat/webapps/目录清空，删掉该文件夹的所有内容，
2.修改/tomcat/conf/web.xml文件:

[html] view plain copy

print ?

<servlet>
<servlet-name>default</servlet-name>
<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<init-param>
<param-name>listings</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet

<servlet>
        <servlet-name>default</servlet-name>
        <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>listings</param-name>
            <param-value>true</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet

3.修改/tomcat/conf/server.xml文件:

[html] view plain copy

print ?

<Host name=“localhost” appBase=“webapps”
unpackWARs=“true” autoDeploy=“true”
xmlValidation=“false” xmlNamespaceAware=“false”>
<!– SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html –>
<!–
<Valve className=”org.apache.catalina.authenticator.SingleSignOn” />
–>
<!– Access log processes all example.
Documentation at: /docs/config/valve.html –>
<!–
<Valve className=“org.apache.catalina.valves.AccessLogValve” directory=“logs”
prefix=“localhost_access_log.” suffix=“.txt” pattern=“common” resolveHosts=“false”/>
–>
<!—-><Context path=“/ser” docBase=“D:\project\myProject\editor\WebRoot”></Context>
<!–<Context path=”/mvc” docBase=”D:\project\myProject\你的项目名\WebRoot”></Context>–>
</Host>

<Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false">

        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"  
               prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>
        -->
<!----><Context path="/ser" docBase="D:\project\myProject\editor\WebRoot"></Context>
<!--<Context path="/mvc" docBase="D:\project\myProject\你的项目名\WebRoot"></Context>-->
      </Host>

分析：

            </div>

重启tomcat上传文件丢失—tomcat在本机导致，实际部署是不会出现上传文件丢失的

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