go复制代码var rdb *redis.Client
var ctx = context.Background()

func initClient() (err error) {
   rdb = redis.NewClient(&redis.Options{
      Addr:     "localhost:6379",
      Password: "",
      DB:       0,
   })
   _, err = rdb.Ping(ctx).Result()
   if err != nil {
      return err
   }
   return nil
}

go复制代码
func redisDemo() {
   err := rdb.Set(ctx, "score", 100, 0).Err()
   if err != nil {
      panic(err)
   }
   val, err := rdb.Get(ctx, "score").Result()
   if err != nil {
      panic(err)
   }
   fmt.Println("score:", val)

   val2, err := rdb.Get(ctx, "keytest").Result()
   if err == redis.Nil {
      // 这里主要是看这个key不存在的判定方法就可以了
      fmt.Println("keytest does not exist")
   } else if err != nil {
      fmt.Println("get keytest failed")
   } else {
      fmt.Println("keytest:", val2)
   }

}

go复制代码func redisDemo2() {
   zsetkey := "language_rank"
   languages := []*redis.Z{
      {Score: 90, Member: "java"},
      {Score: 80, Member: "go"},
      {Score: 70, Member: "js"},
      {Score: 60, Member: "rust"},
      {Score: 50, Member: "c++"},
   }

   num, err := rdb.ZAdd(ctx, zsetkey, languages...).Result()
   if err != nil {
      panic(err)
   }
   fmt.Println("num:", num)
   // 增加值
   newScore, err := rdb.ZIncrBy(ctx, zsetkey, 10, "go").Result()
   if err != nil {
      panic(err)
   }
   fmt.Println("newScore:", newScore)

   // 取分数最高的3个
   ret := rdb.ZRevRangeWithScores(ctx, zsetkey, 0, 2).Val()
   for _, z := range ret {
      fmt.Println("name:", z.Member,
         "  score:", z.Score)
   }

   // 取分数在一定范围之内的
   op := redis.ZRangeBy{
      Min: "80",
      Max: "110",
   }

   ret = rdb.ZRangeByScoreWithScores(ctx, zsetkey, &op).Val()
   for _, z := range ret {
      fmt.Println(z.Member,"  ",z.Score)
   }

}

go复制代码func watchDemo() {
   key := "watch_count"
   err := rdb.Watch(ctx, func(tx *redis.Tx) error {
      n, err := tx.Get(ctx, key).Int64()
      if err != nil && err != redis.Nil {
         return err
      }
      _, err = tx.TxPipelined(ctx, func(pipeliner redis.Pipeliner) error {
         pipeliner.Set(ctx, key, n+1, 0)
         return nil
      })
      return err
   }, key)

   if err != nil {
      fmt.Println("tx exec failed:",err)
      return
   }
   fmt.Println("tx exec success")
}

go复制代码func watchDemo() {
   key := "watch_count"
   err := rdb.Watch(ctx, func(tx *redis.Tx) error {
      n, err := tx.Get(ctx, key).Int()
      if err != nil && err != redis.Nil {
         return err
      }
      _, err = tx.TxPipelined(ctx, func(pipeliner redis.Pipeliner) error {
         time.Sleep(5 * time.Second)
         pipeliner.Set(ctx, key, n+1, 0)
         return nil
      })
      return err
   }, key)

   if err != nil {
      fmt.Println("tx exec failed:", err)
      return
   }
   fmt.Println("tx exec success")
}

java复制代码public class Nutrition {
    private int servingSize;// required
    private int servings;// required
    private int calories;// optional
    private int fat;// optional
    private int sodium;// optional
    private int carbohydrate;// optional

    public Nutrition(final int servingSize, final int servings) {
        this(servingSize, servings, 0, 0, 0, 0);
    }

    public Nutrition(final int servingSize, final int servings, final int calories) {
        this(servingSize, servings, calories, 0, 0, 0);
    }

    public Nutrition(final int servingSize, final int servings, final int calories, final int fat) {
        this(servingSize, servings, calories, fat, 0, 0);
    }

    public Nutrition(final int servingSize, final int servings, final int calories, final int fat, final int sodium) {
        this(servingSize, servings, calories, fat, sodium, 0);
    }

    public Nutrition(final int servingSize, final int servings, final int calories, final int fat, final int sodium, final int carbohydrate) {
        this.servingSize = servingSize;
        this.servings = servings;
        this.calories = calories;
        this.fat = fat;
        this.sodium = sodium;
        this.carbohydrate = carbohydrate;
    }

    // getter
}

java复制代码public class Nutrition {
    private final int servingSize;// required
    private final int servings;// required
    private int calories;// optional
    private int fat;// optional
    private int sodium;// optional
    private int carbohydrate;// optional

    public Nutrition(int servingSize, int servings) {
        this.servingSize = servingSize;
        this.servings = servings;
    }

    // getter and setter
}

java复制代码public class Nutrition {
    private int servingSize;// required
    private int servings;// required
    private int calories;// optional
    private int fat;// optional
    private int sodium;// optional
    private int carbohydrate;// optional

    public static class Builder {
        private final int servingSize;// required
        private final int servings;// required
        private int calories;// optional
        private int fat;// optional
        private int sodium;// optional
        private int carbohydrate;// optional

        public Builder(final int servingSize, final int servings) {
            this.servingSize = servingSize;
            this.servings = servings;
        }

        public Builder setCalories(final int calories) {
            this.calories = calories;
            return this;
        }

        public Builder setFat(final int fat) {
            this.fat = fat;
            return this;
        }

        public Builder setSodium(final int sodium) {
            this.sodium = sodium;
            return this;
        }

        public Builder setCarbohydrate(final int carbohydrate) {
            this.carbohydrate = carbohydrate;
            return this;
        }

        public Nutrition build() {
            // 这里定义依赖关系或者约束条件的校验逻辑
            return new Nutrition(this);
        }
    }

    private Nutrition(Builder builder) {
        servingSize = builder.servingSize;
        servings = builder.servings;
        calories = builder.calories;
        fat = builder.fat;
        sodium = builder.sodium;
        carbohydrate = builder.carbohydrate;
    }

    // getter
}

java复制代码public class Person {
    private String head;
    private String body;
    private String leftHand;
    private String rightHand;
    private String leftLeg;
    private String rightLeg;

    // getter/setter
}

public class PersonBuilder {
    private Person person = new Person();

    public PersonBuilder buildHead() {
        person.setHead("头");
        return this;
    }

    public PersonBuilder buildBody() {
        person.setBody("身体");
        return this;
    }

    public PersonBuilder buildLeftHand() {
        person.setLeftHand("左手");
        return this;
    }

    public PersonBuilder buildRightHand() {
        person.setRightHand("右手");
        return this;
    }

    public PersonBuilder buildLeftLeg() {
        person.setLeftLeg("左腿");
        return this;
    }

    public PersonBuilder buildRightLeg() {
        person.setRightLeg("右腿");
        return this;
    }

    public Person getResult() {
        return this.person;
    }
}

java复制代码public class PersonDirector {
    private final PersonBuilder pb;

    public PersonDirector(final PersonBuilder pb) {
        this.pb = pb;
    }

    public Person createPerson() {
        this.pb
            .buildHead()
            .buildBody()
            .buildLeftHand()
            .buildRightHand()
            .buildLeftLeg()
            .buildRightLeg();
        return this.pb.getResult();
    }
}

xml复制代码<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <!--移除Vintage依赖，不兼容JUnit4-->
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

java复制代码import entity.Book;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * @Author Author_Unknown
 * @Date 2021/11/10 7:17
 * @Description JUnit4使用注解的测试
 */
@RunWith(SpringJUnit4ClassRunner.class)         // 指定测试框架的版本
@ContextConfiguration("classpath:bean1.xml")
public class JTest4 {

    @Autowired
    private Book book;

    @Test
    public void testBook() {
        book.testAttr();
    }

}

java复制代码import entity.Book;
//import org.junit.Test;        // 不能在单一类型的导入中定义(即使用JUnit5就不能同时使用JUnit4)
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;

/**
 * @Author Author_Unknown
 * @Date 2021/11/10 7:29
 * @Description JUnit5的测试
 */
//@ExtendWith(SpringExtension.class)                // (1)
//@ContextConfiguration("classpath:bean1.xml")      // (2)
@SpringJUnitConfig(locations = "classpath:bean1.xml")       // 等价于 (1) + (2)
public class JTest5 {

    @Autowired
    private Book book;

    @Test
    public void test() {
        System.out.println(book);
    }
}

java复制代码@SpringBootTest
class SpringBoot_Junit5 {

    @Test
    @RepeatedTest(3)
    void test() {
        System.out.println("@RepeatedTest..");
    }
}

java复制代码@DisplayName("JUnit5测试类")
@SpringBootTest
class SpringBoot_Junit5 {

    @Test
    @DisplayName("JUnit5测试方法")
    void contextLoads() {
        System.out.println("Say something..");
    }

}

java复制代码@DisplayName("JUnit5测试类")
@SpringBootTest
class SpringBoot_Junit5 {

    @BeforeEach
    public void beforeEachMethod() {
        System.out.println("@BeforeEach..");
    }

    @AfterEach
    public void afterEachMethod() {
        System.out.println("@AfterEach..");
    }

    @Test
    @DisplayName("JUnit5测试方法①")
    void contextLoads() {
        System.out.println("Say something..");
    }

    @Test
    @DisplayName("JUnit5测试方法②")
    void test2() {
        System.out.println("Say what?");
    }

}

java复制代码@DisplayName("JUnit5测试类")
@SpringBootTest
class SpringBoot_Junit5 {

    @BeforeEach
    void beforeEachMethod() {
        System.out.println("@BeforeEach..");
    }

    @AfterEach
    void afterEachMethod() {
        System.out.println("@AfterEach..");
    }

    @BeforeAll
    static void beforeAll() {
        System.out.println("@BeforeAll..");
        System.out.println("============");
    }

    @AfterAll
    static void afterAll() {
        System.out.println("============");
        System.out.println("@AfterAll..");
    }

    @Test
    @DisplayName("JUnit5测试方法①")
    void contextLoads() {
        System.out.println("Say something..");
    }

    @Test
    @DisplayName("JUnit5测试方法②")
    void test2() {
        System.out.println("Say what?");
    }

}

java复制代码@Test
@DisplayName("JUnit5测试方法②")
@Disabled
void test2() {
    System.out.println("Say what?");
}

java复制代码@Test
@DisplayName("JUnit5测试方法①")
@Timeout(value = 500, unit = TimeUnit.MILLISECONDS)
void contextLoads() throws InterruptedException {
    Thread.sleep(550);
    System.out.println("Say something..");
}

java复制代码@SpringBootTest
@DisplayName("测试断言机制")
public class SpringBoot_Assert {

    int sum(int i, int j) {
        return i + j;
    }

    @Test
    @DisplayName("测试简单断言1:assertEquals")
    void testSimpleAssertions1() {
        int cal = sum(1, 5);
        // 报错
        Assertions.assertEquals(5, cal);
        // Nothing happen
        Assertions.assertNotEquals(6, cal, "sum()不符合预期、");
    }

}

java复制代码@SpringBootTest
@DisplayName("测试断言机制")
public class SpringBoot_Assert {
    @Test
    @DisplayName("测试简单断言2:assertSame")
    void testSimpleAssertions2() {
        Object obj1 = new Object();
        Object obj2 = new Object();
        Assertions.assertNotSame(obj1, obj2);
        
        Assertions.assertSame(obj1, obj2, "obj1!=obj2");
        
    }
}

java复制代码@SpringBootTest
@DisplayName("测试断言机制")
public class SpringBoot_Assert {

    boolean returnFlag() {
        return false;
    }

    @Test
    @DisplayName("测试简单断言3:assertTrue、assertNull")
    void testSimpleAssertions() {
        Object obj = null;

        /**
         * org.opentest4j.AssertionFailedError: 不为True ==> 
         * 期望:true
         * 实际 :false
         */
        Assertions.assertTrue(returnFlag(), "不为True");

        /**
         * org.opentest4j.AssertionFailedError: 着实为Null ==> expected: not <null>
         */
        Assertions.assertNotNull(obj, "着实为Null");
    }
}

java复制代码@Test
@DisplayName("测试数组数组断言:assertArrayEquals")
void testAssertArrayEquals() {
    Assertions.assertArrayEquals(new int[]{1, 2, 3}, new int[]{3, 1, 2});
}

java复制代码@Test
@DisplayName("异常断言:assertThrows")
void testAssertThrows() {
    Assertions.assertThrows(ArithmeticException.class, () -> System.out.println(1 / 0));
}

java复制代码@Test
@DisplayName("超时异常:assertTimeout")
void testAssertTimeout() {
    Assertions.assertTimeout(Duration.ofMillis(500), () -> Thread.sleep(1000));
}

java复制代码@Test
@DisplayName("快速失败:fail")
void testFail() {
    if (1 == 2) {
        Assertions.fail("This should fail...");
    }
}

java复制代码@SpringBootTest
public class SpringBoot_Sumptions {
    @Test
    void testSumptions() {
        Assumptions.assumeTrue(false, "false..");

        System.out.println("后续..");
    }

}

java复制代码@SpringBootTest
@DisplayName("嵌套测试")
public class SpringBoot_Nested {

    Stack<Object> stack;

    @Test
    void testNested1() {
        System.out.println("Do nothing...");

        // org.opentest4j.AssertionFailedError: stack is null.. ==> expected: not <null>
        // Assertions.assertNotNull(stack, "stack is null..");
    }

    @Nested     // @Nested不适用于方法
    @DisplayName("When new")
    class whenNew {
        @BeforeEach
        void initialize() {
            stack = new Stack<>();
        }

        @Test
        void testNested2() {
            Assertions.assertNotNull(stack, "stack is null..");
        }

        @Test
        @DisplayName("throws EmptyStackException when popped")
        void throwsExceptionWhenPopped() {
            Assertions.assertThrows(EmptyStackException.class, stack::pop);
        }

        @Nested
        @DisplayName("after pushing an element")
        class afterPushing {
            String anElement = "an element";

            @BeforeEach
            void pushAnElement() {
                stack.push(anElement);
            }

            @Test
            @DisplayName("returns the element when popped and then stack is empty")
            void returnElementWhenPopped() {
                Assertions.assertEquals(anElement, stack.pop());
                Assertions.assertTrue(stack.isEmpty());
            }
        }

    }

}

java复制代码@SpringBootTest
public class SpringBoot_ParameterTest {

    @ParameterizedTest
    @DisplayName("参数化测试1: @ValueSource")
    @ValueSource(ints = {1, 2, 3, 4, 5})
    void testParameters1(int i) {
        System.out.println(i);
    }
    
}

java复制代码@SpringBootTest
public class SpringBoot_ParameterTest {

    // 必须是static静态方法~
    String[] parameterProvider() {
        return new String[]{"hello", "world", "!"};
    }
    
    @ParameterizedTest
    @DisplayName("参数化测试2: @MethodSource")
    @MethodSource("parameterProvider")      // 指定方法名
    void testParameters2(String arr) {
        System.out.println(arr);
    }

}

Java复制代码/**
 * 用户控制器
 * @author lyy
 *
 */
@RestController
@RequestMapping("/admin/user")
public class UserAdminController {

  @Resource
  private UserService userService;

  @Value("${MD5Salt}")
  private String salt; // md5加密盐

  /**
   * 根据ID查找用户
   * @param userId
   * @return
   */
  @RequestMapping("/findById")
  public Map<String, Object> findById(Integer userId) {
    Map<String, Object> resultMap = new HashMap<String, Object>();
    User user = userService.findById(userId);
    resultMap.put("errorNo", 0);
    resultMap.put("data", user);
    return resultMap;
  }

  /**
   * 分页查询用户
   * @param user
   * @param page
   * @return
   */
  @RequestMapping("/list")
  public Map<String, Object> list(User user,
      @RequestParam(value = "latelyLoginTimes", required = false) String latelyLoginTimes,
      @RequestParam(value = "page", required = false) Integer page,
      @RequestParam(value = "pageSize", required = false) Integer pageSize) {
    String s_bregistrationDate = null; // 开始时间
    String s_eregistrationDate = null; // 结束时间
    if (StringUtil.isNotEmpty(latelyLoginTimes)) {
      String[] strs = latelyLoginTimes.split(" - "); // 拆分时间段
      s_bregistrationDate = strs[0];
      s_eregistrationDate = strs[1];
    }
    List<User> userList = userService.list(user, s_bregistrationDate, s_eregistrationDate, page - 1, pageSize);
    Long total = userService.getCount(user, s_bregistrationDate, s_eregistrationDate);
    Map<String, Object> resultMap = new HashMap<String, Object>();
    resultMap.put("errorNo", 0);
    resultMap.put("data", userList);
    resultMap.put("total", total);
    return resultMap;
  }

  /**
   * unfollow
   * @param request
   * @param userId
   * @return
   */
  @RequestMapping("/removeFocusUser")
  public ModelAndView removeFocusUser(HttpServletRequest request, String userId) {
    ModelAndView mav = new ModelAndView();
    User user = (User) request.getSession().getAttribute("user");// 当前登录用户

    String userIds = user.getUserIds();
    List<String> tempList = Arrays.asList(userIds.split(","));
    List<String> lineIdList = new ArrayList<>(tempList);
    lineIdList.remove(userId);
    String ret = StringUtils.join(lineIdList, ",");

    user.setUserIds(ret);

    userService.save(user);
    mav.setViewName("redirect:/viewFocusUser");
    return mav;
  }

  /**
   * 关注用户
   * @param request
   * @param userId
   * @return
   */
  @RequestMapping("/addFocusUser")
  public ModelAndView addFocusUser(HttpServletRequest request, String userId) {
    ModelAndView mav = new ModelAndView();
    User user = (User) request.getSession().getAttribute("user");// 当前登录用户

    String userIds = user.getUserIds();
    List<String> tempList = Arrays.asList(userIds.split(","));
    List<String> lineIdList = new ArrayList<>(tempList);
    lineIdList.add(userId);
    String ret = StringUtils.join(lineIdList, ",");

    user.setUserIds(ret);

    userService.save(user);
    mav.setViewName("redirect:/viewFocusUser");
    return mav;
  }

  @RequestMapping("/addFocusUser/{userId}")
  public ModelAndView addFocusUser(@PathVariable(value = "userId", required = false) Integer userId,
      HttpSession session) {
    ModelAndView mav = new ModelAndView();
    User user = (User) session.getAttribute("user");// 当前登录用户

    String userIds = user.getUserIds();
    List<String> tempList = new ArrayList<>();
    if (userIds != null) {
      tempList = Arrays.asList(userIds.split(","));
    }
    List<String> lineIdList = new ArrayList<>(tempList);
    lineIdList.add(userId.toString());
    String ret = StringUtils.join(lineIdList, ",");

    user.setUserIds(ret);

    userService.save(user);
    mav.setViewName("redirect:/viewFocusUser");
    return mav;
  }

  /**
   * 取消收藏
   * @param request
   * @return
   */
  @RequestMapping("/removeCollection")
  public ModelAndView removeCollection(HttpServletRequest request, String artId) {
    ModelAndView mav = new ModelAndView();
    User user = (User) request.getSession().getAttribute("user");// 当前登录用户

    String artIds = user.getArticleIds();
    List<String> tempList = Arrays.asList(artIds.split(","));
    List<String> lineIdList = new ArrayList<>(tempList);
    lineIdList.remove(artId);
    String ret = StringUtils.join(lineIdList, ",");

    user.setArticleIds(ret);

    userService.save(user);
    mav.setViewName("redirect:/viewCollection");
    return mav;
  }

  /**
   * 收藏
   * @param request
   * @return
   */
  @RequestMapping("/addCollection")
  public ModelAndView addCollection(HttpServletRequest request, String artId) {
    ModelAndView mav = new ModelAndView();
    User user = (User) request.getSession().getAttribute("user");// 当前登录用户
    String artIds = user.getArticleIds();
    List<String>  tempList= Arrays.asList(artIds.split(","));
    List<String> lineIdList = new ArrayList<>(tempList);
    lineIdList.add(artId);
      String ret = StringUtils.join(lineIdList, ",");
      user.setArticleIds(ret);
    userService.save(user);

    mav.setViewName("redirect:/viewCollection");
    return mav;
  }

  @RequestMapping("/delete")
  public Map<String, Object> delete(Integer userId) {
    Map<String, Object> resultMap = new HashMap<String, Object>();
    userService.delete(userId);
    resultMap.put("errorNo", 0);
    return resultMap;
  }
}

bash复制代码[root@VM-8-10-centos ~]# ls -1
app
#  list one file per line.  Avoid '\n' with -q or -b
[root@VM-8-10-centos ~]# ls -l
total 12
drwxr-xr-x 3 root root 4096 11月  1 11:44 app

[root@VM-8-10-centos ~]# ls -a -1 # 全部显示包括隐藏的
.
..
app
.bash_history
.bash_logout
.bash_profile
.bashrc
.cache
.config

[root@VM-8-10-centos ~]# ls -al
total 132
权限           属主  属组   大小 最后一次访问时间 文件或目录名字
dr-xr-x---. 10 root root  4096 11月  4 10:48 .
dr-xr-xr-x. 19 root root  4096 11月  4 17:52 ..
drwxr-xr-x   3 root root  4096 11月  1 11:44 app
# d 表示目录
# - 表述文件

bash复制代码[root@VM-8-10-centos ~]# pwd
/root

bash复制代码# 相对路径
[root@VM-8-10-centos ~]# pwd
/root
[root@VM-8-10-centos ~]# cd app
[root@VM-8-10-centos app]# pwd
/root/app

# 绝对路径
[root@VM-8-10-centos app]# cd /root/app
[root@VM-8-10-centos app]# pwd
/root/app

bash复制代码mkdir [-p] 文件夹名字  创建目录
# 创建一个文件夹
[root@VM-8-10-centos app]# mkdir test
[root@VM-8-10-centos app]# ls -1
http
test

# 创建多级文件夹
[root@VM-8-10-centos app]# mkdir -p test2/aaa
[root@VM-8-10-centos app]# ls
http  test  test2
[root@VM-8-10-centos app]# cd test2
[root@VM-8-10-centos test2]# ls
aaa
[root@VM-8-10-centos test2]# cd aaa
[root@VM-8-10-centos aaa]# ls
[root@VM-8-10-centos aaa]# pwd
/root/app/test2/aaa

bash复制代码rmdir [-p] 文件夹名字   # 删除空的目录 
[root@VM-8-10-centos aaa]# cd ..
[root@VM-8-10-centos test2]# rmdir aaa
[root@VM-8-10-centos test2]# ls

rmdir -p bbb/ccc # 删除多级空目录 , 前提是 ccc 也是空的

bash复制代码rm [选项] 文件/目录  #删除文件或目录
-i 删除前逐一询问确认
-f 即使原文件属性设为只读,也可以直接删除, 无需逐一确认
-r 将目录及一下文件逐一删除

rm -rf *

[root@VM-8-10-centos test2]# touch aaa.txt
[root@VM-8-10-centos test2]# ls -1
aaa.txt
[root@VM-8-10-centos test2]# rm aaa.txt
rm: remove regular empty file 'aaa.txt'? yes
[root@VM-8-10-centos test2]# ls

bash复制代码touch aaa.txt # 创建文件

bash复制代码# 语法: cp [选项] 数据源 目的地  文件复制
# 参数选项
-a   # 此选项通常在复制目录时使用,但它保留链接,文件属性,并复制目录下的所有内容
-d   # 复制时保留链接(相当于windows中的快捷方式)。
-f   # 覆盖已经存在的目标文件而不给出提示
-i   # 与 -f 相反,在覆盖目标文件之前给出提示,要求用户确认是否覆盖,回答"Y"时目标文件将被覆盖。
-p   # 除复制文件的内容外还把修正改时间和访问权限也复制到新文件中
-r/R # 若给出的源文件是一个目录文件,此时将复制该目录下所有的子目录和文件
-I   # 不复制文件,只是生成链接文件(创建快捷方式)

bash复制代码cp aaa/* ccc #只能拷贝文件
cp -r aaa/* ccc # 拷贝全部包括文件夹

bash复制代码# 相当于windows中的剪切功能
# 语法: mv [选项] 数据源 目的地     改名 | 移动文件或文件夹
# 参数选项
-i # 若指定目录已有同名文件,则先询问是否覆盖旧文件
-f # 若指定目录已有同名文件,直接覆盖不提示

bash复制代码mv a.txt b.txt # 重命名
mv a.txt /home/a.txt # 移动(剪切) a.txt 到 home 下

bash复制代码fdisk -l /dev/sdb

bash复制代码fdisk /dev/sdb

sql复制代码show global status like 'Thread%';

sql复制代码--非交互式超时时间，如 JDBC 程序
show global variables like 'wait timeout';
--交互式超时时间，如数据库工具
show global variables like 'interactive timeout';

sql复制代码show variables like 'max connections';

sql复制代码show status like 'Last query cost';

sql复制代码EXPLAIN select name from user where id=1;

sql复制代码show variables like 'datadir';

arduino复制代码import time
import calender

perl复制代码#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/11/10 22:49 上午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷学委
# @XueWeiTag: CodingDemo
# @File : createtime.py
# @Project : hello


import time

# fixed time: time.struct_time(tm_year=2021, tm_mon=11, tm_mday=10, tm_hour=22, tm_min=55, tm_sec=11, tm_wday=16, tm_yday=16, tm_isdst=16)
the9fields = (2021, 11, 10, 22, 55, 11, 16, 16, 16)
fixed = time.struct_time(the9fields)
print("fixed time:", fixed)
print("type:", type(fixed))

result = time.asctime(the9fields)  # 类似struct_time，需要9个元素构成的元组参数。
print("asc time:", result)
print("type:", type(result))

localtime = time.localtime()
print("local time:", localtime)
print("type:", type(localtime))
print("asc time:", time.asctime(localtime))

python复制代码#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/11/10 22:49 上午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷学委
# @XueWeiTag: CodingDemo
# @File : createtime.py
# @Project : hello


import time

#fixed time: time.struct_time(tm_year=2021, tm_mon=11, tm_mday=10, tm_hour=22, tm_min=55, tm_sec=11, tm_wday=16, tm_yday=16, tm_isdst=16)
fixed = time.struct_time((2021, 11, 10, 22, 55, 11, 16, 16, 16))
print("fixed time:", fixed)

perl复制代码#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2021/11/10 22:49 上午
# @Author : LeiXueWei
# @CSDN/Juejin/Wechat: 雷学委
# @XueWeiTag: CodingDemo
# @File : createtime2.py
# @Project : hello


import time

sec = 3600  # 纪元开始后的一个小时（GMT 19700101凌晨）

#
gmtime = time.gmtime(sec)
print("gmtime:", gmtime)  # GMT
print("type:", type(gmtime))
print(time.strftime("%b %d %Y %H:%M:%S", gmtime))
print(time.strftime("%Y-%m-%d %H:%M:%S %Z", gmtime))  # 打印日期加上时区

print("*" * 16)
localtime = time.localtime(sec)
print("localtime:", localtime)  # 本地时间
print("type:", type(localtime))

print(time.strftime("%b %d %Y %H:%M:%S", localtime))
print(time.strftime("%Y-%m-%d %H:%M:%S %Z", localtime))  # 打印日期加上时区

#试试其他格式
print(time.strftime("%D", localtime))
print(time.strftime("%T", localtime))

xml复制代码<dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.22</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.5.6</version>
        </dependency>
    </dependencies>

less复制代码/**
 * @author zhj
 */
@Data
@ConfigurationProperties(prefix = "com.zhj.vo.student")
public class Student {
​
    private Long id;
​
    private String name;
​
    private Integer age;
}

less复制代码/**
 * 自动装配类
 * @author zhj
 */
@Configuration // 需要进行Bean注册的
@EnableConfigurationProperties({Student.class}) //Bean注册
public class AutoConfiguration {
}

xml复制代码<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <version>2.5.6</version>
</dependency>

yaml复制代码com:
  zhj:
    vo:
      student:
        id: 1
        name: '小明'
        age: 12

less复制代码/**
 * 自动注入测试类
 * @author zhj
 */
@RunWith(SpringRunner.class) // junit4 测试环境
@WebAppConfiguration // 启动web运行环境
@SpringBootTest(classes = AutoConfigApplication.class) // 指定启动类
public class AutoConfigTest {
​
    @Autowired
    @Qualifier("com.zhj.vo.student-com.zhj.vo.Student") // 前缀-类名 注入
    private Student student;
​
    @Test
    public void test01() {
        System.out.println(student);
    }
}

less复制代码/**
 * 自动装配类
 * @author zhj
 */
@Configuration // 需要进行Bean注册的
@Import({Student.class}) //Bean注册
public class AutoConfiguration {
}

less复制代码/**
 * 自动注入测试类
 * @author zhj
 */
@RunWith(SpringRunner.class) // junit4 测试环境
@WebAppConfiguration // 启动web运行环境
@SpringBootTest(classes = AutoConfigApplication.class) // 指定启动类
public class AutoConfigTest {
​
    @Autowired
    private Student student;
​
    @Test
    public void test01() {
        System.out.println(student);
    }
}

typescript复制代码/**
 * @author zhj
 */
public class DefaultImportSelector implements ImportSelector {
    @Override
    public String[] selectImports(AnnotationMetadata importingClassMetadata) {
        return new String[] {"com.zhj.vo.Student"};
    }
}

less复制代码/**
 * 自动装配类
 * @author zhj
 */
@Configuration // 需要进行Bean注册的
@Import({DefaultImportSelector.class})
public class AutoConfiguration {
}

java复制代码/**
 * @author zhj
 */
public class DefaultImportBeanDefinitionRegister implements ImportBeanDefinitionRegistrar {
​
    @Override
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
        RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(Student.class); // 配置bean
        registry.registerBeanDefinition("studentInstance", rootBeanDefinition); // Bean 注册
    }
}

less复制代码/**
 * 自动装配类
 * @author zhj
 */
@Configuration // 需要进行Bean注册的
@Import({DefaultImportBeanDefinitionRegister.class})
public class AutoConfiguration {
}

xml复制代码<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <version>2.5.6</version>
</dependency>

json复制代码{
  "groups": [
    {
      "name": "com.zhj.vo.student",
      "type": "com.zhj.vo.Student",
      "sourceType": "com.zhj.vo.Student"
    }
  ],
  "properties": [
    {
      "name": "com.zhj.vo.student.age",
      "type": "java.lang.Integer",
      "sourceType": "com.zhj.vo.Student"
    },
    {
      "name": "com.zhj.vo.student.id",
      "type": "java.lang.Long",
      "sourceType": "com.zhj.vo.Student"
    },
    {
      "name": "com.zhj.vo.student.name",
      "type": "java.lang.String",
      "sourceType": "com.zhj.vo.Student"
    }
  ],
  "hints": []
}

less复制代码/**
 * 自动装配类
 * @author zhj
 */
@Configuration // 需要进行Bean注册的
@Import({DefaultImportBeanDefinitionRegister.class})
public class AutoConfiguration {
​
    // 自动注册Bean
    @Bean(name = "Students")
    public List<String> getNameList() {
        List list = new ArrayList();
        list.add("小明");
        list.add("小红");
        list.add("小李");
        return list;
    }
}

ini复制代码org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.zhj.config.AutoConfiguration

xml复制代码<dependencies>
    <dependency>
        <groupId>com.zhj</groupId>
        <artifactId>spring-boot-auto-config-starter</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>

less复制代码/**
 * @author zhj
 */
@Data
@ConfigurationProperties(prefix = "com.zhj.vo.student")
public class Student {
​
    private Long id;
​
    private String name;
​
    private Integer age;
}

yaml复制代码com:
  zhj:
    vo:
      student:
        id: 1
        name: '小明'
        age: 12

kotlin复制代码/**
 * @author zhj
 */
@RestController
public class HelloController {
​
    @Autowired
    private Student student;
​
    @GetMapping("/hello")
    public String hello() {
        return "hello "+ student;
    }
}

java复制代码public class RedisAutoConfiguration {
    public RedisAutoConfiguration() {
    }

    @Bean
    @ConditionalOnMissingBean(
        name = {"redisTemplate"}
    )
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate<Object, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }

    @Bean
    @ConditionalOnMissingBean
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        StringRedisTemplate template = new StringRedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }
}

java复制代码@Configuration
public class RedisConfig {

    @Bean
    @SuppressWarnings("all")
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(factory);
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();

        // key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用jackson
        template.setValueSerializer(jackson2JsonRedisSerializer);
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }
}

java复制代码public class Student implements Serializable {}

yaml复制代码protected-mode no #保护模式
port 6379
daemonize yes
supervised no
pidfile /var/run/redis_6379.pid 
#日志级别
# Specify the server verbosity level.
# This can be one of:
# debug (a lot of information, useful for development/testing)
# verbose (many rarely useful info, but not a mess like the debug level)
# notice (moderately verbose, what you want in production probably)
# warning (only very important / critical messages are logged)
loglevel notice
​
logfile "" #日志文件名
databases 16 #一共有16个数据库
​

bash复制代码#如果900s内,如果至少一个key进行了修改，我们进行持久化操作
save 900 1
save 300 10
save 60 10000
​
#
stop-writes-on-bgsave-error yes
​
rdbcompression yes
​
rdbchecksum yes
​
dbfilename dump.rdb
​
dir ./

arduino复制代码requirepass foobared #redis设置密码

复制代码maxclients 10000

perl复制代码appendonly no
# The name of the append only file (default: "appendonly.aof")
appendfilename "appendonly.aof"
# appendfsync always
appendfsync everysec
# appendfsync no

bast复制代码stop-writes-on-bg
rdbcompresssion yes #是否压缩rdb文件,需要消耗一些cpu资源
rdbchecksum yes #保存rdb文件的时候是否进行校验
dir ./ #rdb文件保存目录
REp  #主从复制