SpringBoot拦截器Filter的使用方法详解

2023-07-28 17:37:14 310

前言：

最新Servlet3.0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

packagetop.ytheng.demo.filter;

importjava.io.IOException;

importjavax.servlet.Filter;
importjavax.servlet.FilterChain;
importjavax.servlet.FilterConfig;
importjavax.servlet.ServletException;
importjavax.servlet.ServletRequest;
importjavax.servlet.ServletResponse;
importjavax.servlet.annotation.WebFilter;
importjavax.servlet.http.HttpServletRequest;
importjavax.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")
publicclassLoginFilterimplementsFilter{

/*
*容器加载完成调用
**/
@Override
publicvoidinit(FilterConfigfilterConfig)throwsServletException{
//TODOAuto-generatedmethodstub
System.out.println("filterinit...");
}

/*
*请求被拦截的时候调用
**/
@Override
publicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,FilterChainchain)
throwsIOException,ServletException{
//TODOAuto-generatedmethodstub
System.out.println("doFilter...");

HttpServletRequestreq=(HttpServletRequest)request;
HttpServletResponseresp=(HttpServletResponse)response;

Stringusername=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
publicvoiddestroy(){
//TODOAuto-generatedmethodstub
System.out.println("filterdestroy...");
}

}

3.添加测试控制器

packagetop.ytheng.demo.controller;

importjava.util.HashMap;
importjava.util.Map;

importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/v1/filter")
publicclassFilterController{

@RequestMapping("/test")
publicObjecttestFilter(){
Mapmap=newHashMap<>();
map.put("name","theng");
map.put("pwd","123456");
returnmap;
}
}

4.添加启动类

packagetop.ytheng.demo;

importorg.springframework.boot.autoconfigure.SpringBootApplication;
importorg.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication//等于下面3个
//@SpringBootConfiguration
//@EnableAutoConfiguration
//@ComponentScan
//拦截器用到
@ServletComponentScan
publicclassDemoApplication{

publicstaticvoidmain(String[]args){
SpringApplication.run(DemoApplication.class,args);
}

}

5.添加拦截后调整的页面filter.html





Inserttitlehere


hellotheng
filtersuccess

6.右键项目RunAs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毛票票。

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SpringBoot拦截器Filter的使用方法详解

hellotheng

filtersuccess

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