Springboot 连接使用 Redis Example

通过一个简单的例子使用Springboot 连接并使用Redis。本文假设已经安装好Redis。

1.首先将URL转换为一个ID ，并使用 StringRedisTemplate 将ID 和 URL 保存到Redis

2. 根据ID 从Redis中获取对应的URL

项目结构如下

Springboot 连接使用 Redis Example

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

Springboot 连接使用 Redis Example

之后启动Redis server

Springboot 连接使用 Redis Example

启动Springboot Application.

此时，可以用Postman测试效果。

首先，使用 HTTP POST method 根据URL 生成一个 ID

Springboot 连接使用 Redis Example

之后，使用 ID 获取对应的 URL

Springboot 连接使用 Redis Example