增加 spring boot + feign 示例

lab-42/lab-42-demo02/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>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.2.2.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-42-demo02</artifactId>
+
+    <dependencies>
+        <!-- 实现对 Spring MVC 的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- 实现对数据库连接池的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+        </dependency>
+        <dependency> <!-- 本示例，我们使用 MySQL -->
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>5.1.46</version>
+        </dependency>
+
+        <!-- 方便等会写单元测试 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId> <!-- 单元测试，我们采用 H2 作为数据库 -->
+            <artifactId>h2</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

lab-42/lab-42-demo02/src/main/java/cn/iocoder/springboot/lab23/testdemo/Application.java

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+package cn.iocoder.springboot.lab23.testdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}

lab-42/lab-42-demo02/src/main/java/cn/iocoder/springboot/lab23/testdemo/controller/UserController.java

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+package cn.iocoder.springboot.lab23.testdemo.controller;
+
+import cn.iocoder.springboot.lab23.testdemo.dataobject.UserDO;
+import cn.iocoder.springboot.lab23.testdemo.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * 用户 Controller
+ */
+@RestController
+@RequestMapping("/user")
+public class UserController {
+
+    @Autowired
+    private UserService userService;
+
+    /**
+     * 获得指定用户编号的用户
+     *
+     * @param id 用户编号
+     * @return 用户
+     */
+    @GetMapping("/get") // URL 修改成 /get
+    public UserDO get(@RequestParam("id") Integer id) {
+        // 查询并返回用户
+        return userService.get(id);
+    }
+
+}

lab-42/lab-42-demo02/src/main/java/cn/iocoder/springboot/lab23/testdemo/dao/UserDao.java

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+package cn.iocoder.springboot.lab23.testdemo.dao;
+
+import cn.iocoder.springboot.lab23.testdemo.dataobject.UserDO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.BeanPropertyRowMapper;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class UserDao {
+
+    @Autowired
+    private JdbcTemplate template;
+
+    public UserDO selectById(Integer id) {
+        return template.queryForObject("SELECT id, username, password FROM t_user WHERE id = ?",
+                new BeanPropertyRowMapper<>(UserDO.class), // 结果转换成对应的对象
+                id);
+    }
+
+}

lab-42/lab-42-demo02/src/main/java/cn/iocoder/springboot/lab23/testdemo/dataobject/UserDO.java

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+package cn.iocoder.springboot.lab23.testdemo.dataobject;
+
+/**
+ * 用户 DO
+ */
+public class UserDO {
+
+    /**
+     * 用户编号
+     */
+    private Integer id;
+    /**
+     * 账号
+     */
+    private String username;
+    /**
+     * 密码（明文）
+     *
+     * ps：生产环境下，千万不要明文噢
+     */
+    private String password;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public UserDO setId(Integer id) {
+        this.id = id;
+        return this;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public UserDO setUsername(String username) {
+        this.username = username;
+        return this;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public UserDO setPassword(String password) {
+        this.password = password;
+        return this;
+    }
+
+}

lab-42/lab-42-demo02/src/main/java/cn/iocoder/springboot/lab23/testdemo/service/UserService.java

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+package cn.iocoder.springboot.lab23.testdemo.service;
+
+import cn.iocoder.springboot.lab23.testdemo.dao.UserDao;
+import cn.iocoder.springboot.lab23.testdemo.dataobject.UserDO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+
+    @Autowired
+    private UserDao userDao;
+
+    public UserDO get(Integer id) {
+        return userDao.selectById(id);
+    }
+
+    public boolean exists(String username) {
+        return true;
+    }
+
+    public Integer add(String username, String password) {
+        if (exists(username)) {
+            return null;
+        }
+        return 1;
+    }
+
+}

lab-42/lab-42-demo02/src/main/resources/application.yaml

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+spring:
+  # datasource 数据源配置内容
+  datasource:
+    url: jdbc:mysql://127.0.0.1:3306/lab-39-mysql?useSSL=false&useUnicode=true&characterEncoding=UTF-8
+    driver-class-name: com.mysql.jdbc.Driver
+    username: root
+    password:

lab-42/lab-42-demo02/src/test/java/cn/iocoder/springboot/lab23/testdemo/controller/UserControllerTest.java

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+package cn.iocoder.springboot.lab23.testdemo.controller;
+
+import cn.iocoder.springboot.lab23.testdemo.dataobject.UserDO;
+import cn.iocoder.springboot.lab23.testdemo.service.UserService;
+import org.hamcrest.core.IsEqual;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.ResultActions;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
+
+/**
+ * UserController 单元测试
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@AutoConfigureMockMvc
+public class UserControllerTest {
+
+    @Autowired
+    private MockMvc mvc;
+
+    @MockBean
+    private UserService userService;
+
+    @Test
+    public void testGet() throws Exception {
+        // Mock UserService 的 get 方法
+        Mockito.when(userService.get(1)).thenReturn(
+                new UserDO().setId(1).setUsername("username:1").setPassword("password:1"));
+
+        // 查询用户
+        ResultActions resultActions = mvc.perform(MockMvcRequestBuilders.get("/user/get?id=1"));
+
+        // 校验响应状态码
+        resultActions.andExpect(MockMvcResultMatchers.status().isOk()); // 响应状态码 200
+
+        // 校验响应内容方式一：直接全部匹配
+        resultActions.andExpect(MockMvcResultMatchers.content().json("{\n" +
+                "    \"id\": 1,\n" +
+                "    \"username\": \"username:1\",\n" +
+                "    \"password\": \"password:1\"\n" +
+                "}", true)); // 响应结果
+
+        // 校验响应内容方式二：逐个字段匹配
+        resultActions.andExpect(MockMvcResultMatchers.jsonPath("id", IsEqual.equalTo(1)));
+        resultActions.andExpect(MockMvcResultMatchers.jsonPath("username", IsEqual.equalTo("username:1")));
+        resultActions.andExpect(MockMvcResultMatchers.jsonPath("password", IsEqual.equalTo("password:1")));
+    }
+
+}

lab-42/lab-42-demo02/src/test/java/cn/iocoder/springboot/lab23/testdemo/dao/UserDaoTest.java

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+package cn.iocoder.springboot.lab23.testdemo.dao;
+
+import cn.iocoder.springboot.lab23.testdemo.dataobject.UserDO;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.jdbc.Sql;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class UserDaoTest {
+
+    @Autowired
+    private UserDao userDao;
+
+    @Test
+    @Sql(scripts = "/sql/create_tables.sql", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+    @Sql(statements = "INSERT INTO `t_user`(`id`, `username`, `password`) VALUES (1, 'username:1', 'password:1');", executionPhase = Sql.ExecutionPhase.BEFORE_TEST_METHOD)
+    @Sql(scripts = "/sql/clean.sql", executionPhase = Sql.ExecutionPhase.AFTER_TEST_METHOD)
+    public void testSelectById() {
+        // 查询用户
+        UserDO user = userDao.selectById(1);
+
+        // 校验结果
+        Assert.assertEquals("编号不匹配", 1, (int) user.getId());
+        Assert.assertEquals("用户名不匹配", "username:1", user.getUsername());
+        Assert.assertEquals("密码不匹配", "password:1", user.getPassword());
+    }
+
+}

lab-42/lab-42-demo02/src/test/java/cn/iocoder/springboot/lab23/testdemo/package-info.java

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+package cn.iocoder.springboot.lab23.testdemo;

lab-42/lab-42-demo02/src/test/java/cn/iocoder/springboot/lab23/testdemo/service/UserServiceTest.java

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+package cn.iocoder.springboot.lab23.testdemo.service;
+
+import cn.iocoder.springboot.lab23.testdemo.dao.UserDao;
+import cn.iocoder.springboot.lab23.testdemo.dataobject.UserDO;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class UserServiceTest {
+
+    @MockBean
+    private UserDao userDao;
+
+    @Autowired
+    private UserService userService;
+
+    @Test
+    public void testGet() {
+        // Mock UserDao 的 selectById 方法
+        Mockito.when(userDao.selectById(1)).thenReturn(
+                new UserDO().setId(1).setUsername("username:1").setPassword("password:1"));
+
+        // 查询用户
+        UserDO user = userService.get(1);
+
+        // 校验结果
+        Assert.assertEquals("编号不匹配", 1, (int) user.getId());
+        Assert.assertEquals("用户名不匹配", "username:1", user.getUsername());
+        Assert.assertEquals("密码不匹配", "password:1", user.getPassword());
+    }
+
+}

lab-42/lab-42-demo02/src/test/java/cn/iocoder/springboot/lab23/testdemo/service/UserServiceTest2.java

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+package cn.iocoder.springboot.lab23.testdemo.service;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.SpyBean;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class UserServiceTest2 {
+
+    @SpyBean
+    private UserService userService;
+
+    @Test
+    public void testAddSuccess() {
+        System.out.println("testAddSuccess");
+        // Mock UserService 的 exists 方法
+        Mockito.when(userService.exists("username")).thenReturn(
+                false);
+
+        Assert.assertNotNull("注册返回为 null，注册失败",
+                userService.add("username", "password"));
+    }
+
+    @Test
+    public void testAddFailure() {
+        System.out.println("testAddFailure");
+
+        Assert.assertNull("注册返回为 null，注册失败",
+                userService.add("username", "password"));
+    }
+
+}

lab-42/lab-42-demo02/src/test/resources/application.yaml

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+spring:
+  # datasource 数据源配置内容
+  datasource:
+    url: jdbc:h2:mem:testdb
+    driver-class-name: org.h2.Driver
+    username: sa
+    password:

lab-42/lab-42-demo02/src/test/resources/sql/clean.sql

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+DROP TABLE `t_user`

lab-42/lab-42-demo02/src/test/resources/sql/create_tables.sql

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+CREATE TABLE `t_user` (
+   `id` INT AUTO_INCREMENT  PRIMARY KEY COMMENT '用户编号',
+   `username` VARCHAR(64) NOT NULL COMMENT '账号',
+   `password` VARCHAR(64) NOT NULL COMMENT '密码'
+);