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最新Servlet 3.0拦截器的使用
1.pom.xml添加需要使用的依赖
4.0.0 top.ytheng springboot-demo 0.0.1 jar org.springframework.boot spring-boot-starter-parent 2.0.5.RELEASE UTF-8 UTF-8 1.8 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-starter-thymeleaf org.springframework.boot spring-boot-devtools true true myspringboot org.springframework.boot spring-boot-maven-plugin maven-compiler-plugin 1.8 1.8
2.添加Filter拦截器
package top.ytheng.demo.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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//Servlet3.0特性
//urlPatterns:拦截的url地址
//filterName:拦截器名称
@WebFilter(urlPatterns="/api/*", filterName="loginFilter")
public class LoginFilter implements Filter{
/*
* 容器加载完成调用
* */
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
System.out.println("filter init...");
}
/*
* 请求被拦截的时候调用
* */
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
// TODO Auto-generated method stub
System.out.println("doFilter...");
HttpServletRequest req = (HttpServletRequest)request;
HttpServletResponse resp = (HttpServletResponse)response;
String username = req.getParameter("username");
if(username.equals("theng")) {
chain.doFilter(request, response);
} else {
//重定向
resp.sendRedirect("/filter.html");
return;
}
}
/*
* 容器被销毁的时候调用
* */
@Override
public void destroy() {
// TODO Auto-generated method stub
System.out.println("filter destroy...");
}
}3.添加测试控制器
package top.ytheng.demo.controller;
import java.util.HashMap;
import java.util.Map;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/api/v1/filter")
public class FilterController {
@RequestMapping("/test")
public Object testFilter() {
Map map = new HashMap<>();
map.put("name", "theng");
map.put("pwd", "123456");
return map;
}
} 4.添加启动类
package top.ytheng.demo;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication //等于下面3个
//@SpringBootConfiguration
//@EnableAutoConfiguration
//@ComponentScan
//拦截器用到
@ServletComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}5.添加拦截后调整的页面filter.html
Insert title here hello theng
filter success
6.右键项目Run As启动项目，测试地址
http://localhost:8080/api/v1/filter/test?username=theng http://localhost:8080/api/v1/filter/test?username=ytheng
另附：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
