新建一个项目
新建Firstfilter类
Firstfliter.java
package com.example.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
/**
*SpringBoot 整合 Filter 方式一
*<filter>
* <filter-name>FirstFilter</filter-name>
* <filter-class>com.bjsxt.filter.FirstFilter</filter-class>
*</filter>
*<filter-mapping>
* <filter-name>FirstFilter</filter-name>
* <url-pattern>/first</url-pattern>
*</filter-mapping>
*/
@WebFilter(filterName = "Firstfilter",urlPatterns = "/first")
public class Firstfilter implements Filter{
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throws IOException, ServletException {
System.out.println("进入 Filter");
arg2.doFilter(arg0, arg1);
System.out.println("离开 Filter");
}
@Override
public void init(FilterConfig arg0) throws ServletException {
}
}
新建servlet包,同时在包内新建FirstServlet类
FirstServlet.java类
package com.example.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*SpringBoot整合Servlet方式一
*
*<servlet>
* <servlet-name>FirstServlet</servlet-name>
* <servlet-class>com.bjsxt.servlet.FirstServlet</servlet-class>
*</servlet>
*
*<servlet-mapping>
* <servlet-name>FirstServlet</servlet-name>
* <url-pattern>/first</url-pattern>
*</servlet-mapping>
*
*/
@WebServlet(name="FirstServlet",urlPatterns="/first")
public class FirstServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("FirstServlet............");
}
}
新建一个App.java启动类
App.java类
package com.example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
/**
*SpringBoot 整合 Filter 方式一
*
*/
@SpringBootApplication
@ServletComponentScan
public class App {
public static void main(String[] args)
{
SpringApplication.run(App.class,args);
}
}
运行启动类
在浏览器运行
在终端打印出
现在用第二种方式整合filter
新建SecndFilter类
新建SecndServlet类
SecondServlet.java
package com.example.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*SpringBoot整合Servlet方式二
*
*/
public class SecondServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("SecondServlet..........");
}
}
新建启动类App2.java
App2.java类
package com.example;
import com.example.filter.SecondFilter;
import com.example.servlet.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
/**
* SpringBoot 整合 Filter 方式二
* * *
*/
@SpringBootApplication
public class App2 {
public static void main(String[] args){
SpringApplication.run(App2.class,args);
}
/**
* 注册 Servlet
* @return
*/
@Bean
public ServletRegistrationBean getServletRegistrationBean(){
ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
bean.addUrlMappings("/second");
return bean;
}
/**
* 注册 Filter
*/
@Bean
public FilterRegistrationBean getFilterRegistrationBean() {
FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
//bean.addUrlPatterns(new String[]{"*.do","*.jsp"});
bean.addUrlPatterns("/second");
return bean;
}
}
运行App2.java类
在浏览器输入
可以看到终端打印出的结果