eclipse中搭建springboot学习（4）---过滤器

在helloController添加登录的方法，过滤器不过滤登录路径，当直接访问hello路径时，由于没有登录会跳转回登陆页面。

package com.example.demo;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class HelloController {

   @ResponseBody
   @RequestMapping("/hello")
   public String hello() {
       return "spring boot!!!!";
   }

   @RequestMapping("/login")
   public String login() {
       return "/login";
   }
}

MyFilter过滤器

package com.example.demo;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

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;

@WebFilter(filterName="myFilter")
public class MyFilter implements Filter{
   //不拦截的url路径
   private static final Set<String> ALLOWED_PATHS = Collections.unmodifiableSet(new HashSet<>(
Arrays.asList("/login")));

   @Override
   public void init(FilterConfig filterConfig) throws ServletException {
       // TODO Auto-generated method stub

   }

   @Override
   public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
           throws IOException, ServletException {
       HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
String path = request.getRequestURI().substring(request.getContextPath().length()).replaceAll("[/]+$", "");
boolean allowedPath = ALLOWED_PATHS.contains(path);

       if(allowedPath) {
           chain.doFilter(request, response);
       }else {
           request.getRequestDispatcher("/login").forward(request, response);
       }
   }

   @Override
   public void destroy() {
       // TODO Auto-generated method stub

   }

}

在DemoApplication 类中添加@ServletComponentScan 注解

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication
@ServletComponentScan
public class DemoApplication {

   public static void main(String[] args) {
       SpringApplication.run(DemoApplication.class, args);
   }

   }

在pom.xml文件中添加thymeleaf包

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>

   <groupId>com.example</groupId>
   <artifactId>demo</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>jar</packaging>

   <name>demo</name>
   <description>Demo project for Spring Boot</description>

   <parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>2.0.6.RELEASE</version>
       <relativePath/> 
   </parent>

   <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
       <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
       <java.version>1.8</java.version>
   </properties>

   <dependencies>

       <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-thymeleaf</artifactId>
   </dependency>

       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>

       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-test</artifactId>
           <scope>test</scope>
       </dependency>

       <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-devtools</artifactId>
   <optional>true</optional>
        </dependency>
   </dependencies>

   <build>
       <plugins>
           <plugin>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
               <configuration>
<fork>true</fork>
</configuration>
           </plugin>
       </plugins>
   </build>

</project>

这时候就可以进行测试，由于本人8080端口被占用，所以将端口号改为8089

修改端口号

server.port=8089

eclipse中搭建springboot学习（4）---过滤器

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