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【笔记】Filter快速入门
source link: https://feiju12138.github.io/2022/10/02/Filter%E5%BF%AB%E9%80%9F%E5%85%A5%E9%97%A8/
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Filter快速入门
- 创建Web项目，引入Servlet依赖
pom.xml
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
创建过滤器类
- 创建一个类，实现
javax.servlet.Filter接口 - 使用
@WebFilter定义过滤的请求，当接收到过滤请求时，会自动执行doFilter()方法 - 使用
chain.doFilter(request, response)放行请求
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;
import java.io.IOException;
@WebFilter("/*")
public class MyFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
}
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
filterChain.doFilter(servletRequest, servletResponse);
}
public void destroy() {
}
}
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