springboot添加过滤器filter
1、 写一个filter 类
import javax.servlet.*;
import java.io.IOException;
public class DemoFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
System.out.println(" 进入了filter " );
chain.doFilter(request,response);
}
}
2、注册filter(即让filter生效)
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
@Configuration
public class FilterConfiger {
@Bean
// @Order(1) //spring boot会按照order值的大小,越小越先执行。(选用)
public FilterRegistrationBean configFilter(){
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new DemoFilter());
filterRegistrationBean.addUrlPatterns("/*"); // 配置需要过滤的路径
filterRegistrationBean.setName("filterDemo");
return filterRegistrationBean;
}
}
如果filter 里要用到bean对象,则要在注册filter里,将bean对象传过去。如下:
filter要用到 studentMapper对象
第一步:先建filter类
import javax.servlet.*;
import java.io.IOException;
public class DemoFilter implements Filter {
private StudentMapper studentMapper;
// 构造函数
public DemoFilter(StudentMapper studentMapper) {
this.studentMapper = studentMapper;
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
System.out.println(" 进入了filter " );
chain.doFilter(request,response);
}
}
第二步,注册filter
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import javax.annotation.Resource;
@Configuration
public class FilterConfiger {
@Resource
private StudentMapper studentMapper;
@Bean
// @Order(1) //spring boot会按照order值的大小,越小越先执行
public FilterRegistrationBean configFilter(){
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new DemoFilter(studentMapper)); // new DemoFilter时传bean过去
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.setName("filterDemo");
return filterRegistrationBean;
}
}