springboot_filter

Author: zhangzq7

springboot_filter/pom.xml

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+<?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">
+    <parent>
+        <artifactId>springboot_chowder</artifactId>
+        <groupId>com.oven</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>springboot_filter</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

springboot_filter/readme.md

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+# springboot炖filter
+### 1. 先睹为快
+### 2. 实现原理
+#### 2.1 新建项目
+#### 2.2 创建maven目录结构，以及pom.xml文件
+#### 2.3 pom.xml文件中加入依赖
+```xml
+<parent>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-parent</artifactId>
+    <version>2.0.5.RELEASE</version>
+    <relativePath/>
+</parent>
+```
+#### 2.4 pom.xml文件中加入springboot-starter依赖
+```xml
+<dependencies>
+    <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-web</artifactId>
+    </dependency>
+</dependencies>
+```
+#### 2.5 pom.xml文件中加入maven-springboot打包插件
+```xml
+<build>
+    <plugins>
+        <plugin>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-maven-plugin</artifactId>
+        </plugin>
+    </plugins>
+</build>
+```
+#### 2.6 开发启动类
+```java
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.ServletComponentScan;
+
+@ServletComponentScan
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}
+```
+#### 2.7 开发测试接口
+```java
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class DemoController {
+
+    @RequestMapping("/test")
+    public Object test(String name) {
+        return "hello " + name;
+    }
+
+    @RequestMapping("/test2")
+    public Object test2(String name) {
+        return "hello " + name;
+    }
+
+}
+```
+#### 2.8 开发过滤器
+```java
+import javax.servlet.*;
+import javax.servlet.annotation.WebFilter;
+import java.io.IOException;
+
+@WebFilter(filterName = "myFilter", urlPatterns = "/test/*")
+public class MyFilter implements Filter {
+
+    @Override
+    public void init(FilterConfig filterConfig) {
+        System.out.println("初始化过滤器。。。");
+    }
+
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
+        System.out.println("进入到过滤器。。。");
+        String name = servletRequest.getParameter("name");
+        if ("Oven".equals(name)) {
+            filterChain.doFilter(servletRequest, servletResponse);
+        }
+    }
+
+    @Override
+    public void destroy() {
+        System.out.println("过滤器销毁。。。");
+    }
+
+}
+```
+#### 2.9 编译打包运行
+### 3. 应用场景

springboot_filter/src/main/java/com/oven/Application.java

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+package com.oven;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.ServletComponentScan;
+
+@ServletComponentScan
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}

springboot_filter/src/main/java/com/oven/controller/DemoController.java

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+package com.oven.controller;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class DemoController {
+
+    @RequestMapping("/test")
+    public Object test(String name) {
+        return "hello " + name;
+    }
+
+    @RequestMapping("/test2")
+    public Object test2(String name) {
+        return "hello " + name;
+    }
+
+}

springboot_filter/src/main/java/com/oven/filter/MyFilter.java

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+package com.oven.filter;
+
+import javax.servlet.*;
+import javax.servlet.annotation.WebFilter;
+import java.io.IOException;
+
+@WebFilter(filterName = "myFilter", urlPatterns = "/test/*")
+public class MyFilter implements Filter {
+
+    @Override
+    public void init(FilterConfig filterConfig) {
+        System.out.println("初始化过滤器。。。");
+    }
+
+    @Override
+    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
+        System.out.println("进入到过滤器。。。");
+        String name = servletRequest.getParameter("name");
+        if ("Oven".equals(name)) {
+            filterChain.doFilter(servletRequest, servletResponse);
+        }
+    }
+
+    @Override
+    public void destroy() {
+        System.out.println("过滤器销毁。。。");
+    }
+
+}