随手看的一本书《java微服务》，测试成功了其中的第一个样例

Posted 2020-09-08

静态语言，JAVA应该多了解，结合微服务，DOCKER,再搞搞SPRING CLOUD，就能跟上时代了。

对了，链一个买书的地址：

https://item.jd.com/12089180.html

（我有时就不了解，一个程序员的收入，买一些书就那么小心呢？呵呵，收入都作什么去了？？：））

pom.xml

<?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.packtpub.mmj.restsample</groupId>
    <artifactId>restsample</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>restsample</name>
    <description>com.packtpub.mmj.restsample</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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-web</artifactId>
            <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </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>

Calculation.java

package com.packtpub.mmj.restsample.model;
import java.util.List;

public class Calculation {
    String funciton;
    private List<String> input;
    private List<String> output;
    
    public Calculation(List<String> input, List<String> output, String function) {
        this.funciton = function;
        this.input = input;
        this.output = output;
    }

    public String getFunciton() {
        return funciton;
    }

    public void setFunciton(String funciton) {
        this.funciton = funciton;
    }

    public List<String> getInput() {
        return input;
    }

    public void setInput(List<String> input) {
        this.input = input;
    }

    public List<String> getOutput() {
        return output;
    }

    public void setOutput(List<String> output) {
        this.output = output;
    }
    
    

}

CalculationController.java

package com.packtpub.mmj.restsample.resources;

import com.packtpub.mmj.restsample.model.Calculation;
import java.util.ArrayList;
import java.util.List;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import static org.springframework.web.bind.annotation.RequestMethod.GET;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping("/calculation")
public class CalculationController {
    private static final String PATTERN = "^-?+\\\\d+\\\\.?+\\\\d*$";
    
    @RequestMapping("/power")
    public Calculation pow(@RequestParam(value="base") String b, @RequestParam(value="exponent") String e) {
        List<String> input = new ArrayList<String>();
        input.add(b);
        input.add(e);
        List<String> output = new ArrayList<String>();
        String powValue = "";
        if (b!=null && e!=null && b.matches(PATTERN) && e.matches(PATTERN)) {
            powValue = String.valueOf(Math.pow(Double.valueOf(b), Double.valueOf(e)));
        } else {
            powValue = "input is error";
        }
        output.add(powValue);
        return new Calculation(input, output, "power");
    }
    
    @RequestMapping(value="/sqrt/{value:.+}", method=GET)
    public Calculation sqrt(@PathVariable(value="value") String aValue) {
        List<String> input = new ArrayList<String>();
        input.add(aValue);
        List<String> output = new ArrayList<String>();
        String sqrtValue = "";
        if (aValue!=null && aValue.matches(PATTERN) ) {
            sqrtValue = String.valueOf(Math.sqrt(Double.valueOf(aValue)));
        } else {
            sqrtValue = "input is error";
        }
        output.add(sqrtValue);
        return new Calculation(input, output, "sqrt");
        
    }

}

RestsampleApplication.java

package com.packtpub.mmj.restsample;

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

@SpringBootApplication
public class RestsampleApplication {

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

输出：