2019独角兽企业重金招聘Python工程师标准>>> 
传统的javaEE增加Filter是在web.xml中配置，如以下代码：
TestFilter
com.cppba.filter.TestFilter
TestFilter
/*
paramName
paramValue
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
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
@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：
https://github.com/bigbeef/cppba-spring-boot
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
https://github.com/bigbeef/cppba-spring-boot
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
@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：
@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！