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@ -21,7 +21,8 @@ The power of the `Filter` comes from the `FilterChain` that is passed into it.
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.`FilterChain` Usage Example
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.`FilterChain` Usage Example
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====
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====
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[source,java]
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.Java
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[source,java,role="primary"]
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----
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----
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
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// do something before the rest of the application
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// do something before the rest of the application
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@ -29,6 +30,16 @@ public void doFilter(ServletRequest request, ServletResponse response, FilterCha
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// do something after the rest of the application
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// do something after the rest of the application
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}
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}
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----
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----
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.Kotlin
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[source,kotlin,role="secondary"]
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----
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fun doFilter(request: ServletRequest, response: ServletResponse, chain: FilterChain) {
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// do something before the rest of the application
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chain.doFilter(request, response) // invoke the rest of the application
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// do something after the rest of the application
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}
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----
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====
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====
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Since a `Filter` only impacts downstream ``Filter``s and the `Servlet`, the order each `Filter` is invoked is extremely important.
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Since a `Filter` only impacts downstream ``Filter``s and the `Servlet`, the order each `Filter` is invoked is extremely important.
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