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SpringBoot使用LomBok SpringBoot使用LomBok的代码实例

dalaoyang 人气:0

Lombok是什么?它是一个能帮我们消除那些必须要写但是重复的代码,比如setter,getter,构造函数之类的方法。

首先先简单说一下idea安装lombok,有2种方法:

1.直接从http://plugins.jetbrains.com/下载,然后放到idea安装文件下面的plugins,然后重启idea

2.在idea的settings(windows)或者Preferences(mac),下找到plugins菜单,点击Browse repositories,如图

然后搜索lombok,点击右侧下载,下载完成重启即可,如图


新建项目,在pom文件中加入lombok依赖,完整pom如下:

<?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.dalaoyang</groupId>
  <artifactId>springboot_lombok</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>springboot_lombok</name>
  <description>springboot_lombok</description>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.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>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.16.20</version>
    </dependency>
  </dependencies>

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

新建一个User类,这个是使用lombok的类,代码如下:

package com.dalaoyang.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang
 * @email yangyang@dalaoyang.cn
 * @date 2018/5/7
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {

  private Integer id;
  private String name;
  private String password;
}

新建一个UserNoLombok类,这个和原来一样,目的为了对比使用lombok的好处,代码如下:

package com.dalaoyang.entity;

import java.util.Objects;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.entity
 * @email yangyang@dalaoyang.cn
 * @date 2018/5/7
 */
public class UserNoLombok {
  private Integer id;
  private String name;
  private String password;

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public UserNoLombok(Integer id, String name, String password) {
    this.id = id;
    this.name = name;
    this.password = password;
  }


  public UserNoLombok() {
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    UserNoLombok that = (UserNoLombok) o;
    return Objects.equals(id, that.id) &&
        Objects.equals(name, that.name) &&
        Objects.equals(password, that.password);
  }

  @Override
  public int hashCode() {

    return Objects.hash(id, name, password);
  }

  @Override
  public String toString() {
    return "UserNoLombok{" +
        "id=" + id +
        ", name='" + name + '\'' +
        ", password='" + password + '\'' +
        '}';
  }
}

然后新建一个UserController测试,代码如下:

package com.dalaoyang.controller;

import com.dalaoyang.entity.User;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.controller
 * @email yangyang@dalaoyang.cn
 * @date 2018/5/7
 */
@RestController
public class UserController {

  @GetMapping("/testUser")
  public User getUser(){
    User user = new User();
    user.setId(1);
    user.setName("dalaoyang");
    user.setPassword("123");
    System.out.println(user.toString());
    return user;
  }
}

访问http://localhost:8080/testUser如图


lombok注解简介:

@Data 标签,生成getter/setter toString()等方法
@NonNull : 让你不在担忧并且爱上NullPointerException
@CleanUp : 自动资源管理:不用再在finally中添加资源的close方法
@Setter/@Getter : 自动生成set和get方法
@ToString : 自动生成toString方法
@EqualsAndHashcode : 从对象的字段中生成hashCode和equals的实现
@NoArgsConstructor/@RequiredArgsConstructor/@AllArgsConstructor
自动生成构造方法
@Data : 自动生成set/get方法,toString方法,equals方法,hashCode方法,不带参数的构造方法
@Value : 用于注解final类
@Builder : 产生复杂的构建器api类
@SneakyThrows : 异常处理(谨慎使用)
@Synchronized : 同步方法安全的转化
@Getter(lazy=true) :
@Log : 支持各种logger对象,使用时用对应的注解,如:@Log4j

源码下载 :大老杨码云

本地源码下载地址:SpringBoot-LomBok_jb51.rar

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