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Spring boot下添加filter
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https://www.cnblogs.com/OnlyCT/p/7133639.html
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前言
传统的javaEE增加Filter是在web.xml中配置，如以下代码：
<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
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：
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
@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！
