前言
傳統的javaEE增加Filter是在web.xml中配置，如以下代碼：
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<filter> <filter-name>TestFilter</filter-name> <filter-class>com.cppba.filter.TestFilter</filter-class></filter><filter-mapping> <filter-name>TestFilter</filter-name> <url-pattern>/*</url-pattern> <init-param> <param-name>paramName</param-name> <param-value>paramValue</param-value> </init-param></filter-mapping> |
然而spring-boot中很明顯不能這樣實現，那怎么辦呢？看完下面的教程，答案自然知道了。
老方法（新方法請直接下拉）
1.創建自定義Filter
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package com.cppba.filter;import javax.servlet.*;import java.io.IOException;public class TestFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("TestFilter"); } @Override public void destroy() { }} |
2.在ApplicationConfiguration.java中增加一個@bean
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@Bean public FilterRegistrationBean testFilterRegistration() { FilterRegistrationBean registration = new FilterRegistrationBean(); registration.setFilter(new TestFilter()); registration.addUrlPatterns("/*"); registration.addInitParameter("paramName", "paramValue"); registration.setName("testFilter"); registration.setOrder(1); return registration; } |
3.啟動項目
你會看到控制臺打印如下代碼：
4.訪問項目
最后我們訪問以下http://127.0.0.1:8080/test
如果你看到控制臺打印出:TestFilter
恭喜你，配置成功！
2017-04-20 最新spring-boot增加Filter方法
首先定義一個Filter
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@Order(1)//重點@WebFilter(filterName = "testFilter1", urlPatterns = "/*")public class TestFilterFirst implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("TestFilter1"); filterChain.doFilter(servletRequest,servletResponse); } @Override public void destroy() { }} |
比較核心的代碼是自定義類上面加上@WebFilter，其中@Order注解表示執行過濾順序，值越小，越先執行
我們在spring-boot的入口處加上如下注解@ServletComponentScan：
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@SpringBootApplication(scanBasePackages = "com.cppba")//重點@ServletComponentScanpublic class Application { public static void main(String[] args) throws UnknownHostException { SpringApplication app = new SpringApplication(Application.class); Environment environment = app.run(args).getEnvironment(); }} |
這種方法效果和上面版本一樣，但是用起來更加方便！以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://www.jianshu.com/p/05c8be17c80a
