前言
传统的javaEE增加Filter是在web.xml中配置,如以下代码:
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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中很明显不能这样实现,那怎么办呢?看完下面的教程,答案自然知道了。
老方法(新方法请直接下拉)
1.创建自定义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中增加一个@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.启动项目
你会看到控制台打印如下代码:
4.访问项目
最后我们访问以下http://127.0.0.1:8080/test
如果你看到控制台打印出:TestFilter
恭喜你,配置成功!
2017-04-20 最新spring-boot增加Filter方法
首先定义一个Filter
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@Order ( 1 ) //重点 @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() { } } |
比较核心的代码是自定义类上面加上@WebFilter,其中@Order注解表示执行过滤顺序,值越小,越先执行
我们在spring-boot的入口处加上如下注解@ServletComponentScan:
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@SpringBootApplication (scanBasePackages = "com.cppba" ) //重点 @ServletComponentScan public class Application { public static void main(String[] args) throws UnknownHostException { SpringApplication app = new SpringApplication(Application. class ); Environment environment = app.run(args).getEnvironment(); } } |
这种方法效果和上面版本一样,但是用起来更加方便!以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.jianshu.com/p/05c8be17c80a