Springboot 鏈接 使用 Redis Example

經過一個簡單的例子使用Springboot 鏈接並使用Redis。 本文假設已經安裝好Redis。

1.首先將URL轉換爲一個ID ，並使用 StringRedisTemplate 將ID 和 URL 保存到Redis

2. 根據ID 從Redis中獲取對應的URL

項目結構以下

POM文件

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>redis-shorterurl</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>redis-shorterurl</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

        <!-- https://mvnrepository.com/artifact/commons-validator/commons-validator -->
        <dependency>
            <groupId>commons-validator</groupId>
            <artifactId>commons-validator</artifactId>
            <version>1.6</version>
        </dependency>
        
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>
        </dependency>


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

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

</project>

 

 以及Java文件

package com.example.redisshorterurl;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class RedisShorterurlApplication {

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

}

package com.example.redisshorterurl;

import java.nio.charset.StandardCharsets;

import org.apache.commons.validator.routines.UrlValidator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import com.google.common.hash.Hashing;

@RestController
public class URLShorterResource {

    @Autowired
    StringRedisTemplate redisTemplate;
    

    @GetMapping("URL/{id}")
    public String getUrl(@PathVariable String id) {
    String url =  redisTemplate.opsForValue().get(id);
    System.out.println("URL Retrieved: " + url);

        if (url == null) {
            throw new RuntimeException("There is no shorter URL for : " + id);
        }
        return url;
    }

    @PostMapping("/create")
    public String create(@RequestBody String url) {
    UrlValidator urlValidator = new UrlValidator(new String[] { "http", "https" });
    if (urlValidator.isValid(url)) {
        String id = Hashing.murmur3_32().hashString(url, StandardCharsets.UTF_8).toString();
        System.out.println("URL ID generated:" + id);
        redisTemplate.opsForValue().set(id, url);
        return id;
    }
     throw new RuntimeException("URL Invalid: " + url);

    }

}

application.properties 

以後啓動Redis server

 

 啓動Springboot Application.

 

此時，能夠用Postman測試效果。

首先， 使用 HTTP POST method 根據URL 生成一個 ID 

以後，使用 ID  獲取對應的 URL