如何去除get，set方法。@Data註解和如何使用，lombok

主要的作用提高代碼的簡潔

@Data

去除一些重複的get,set方法，

1.需要官網下載jar包

https://projectlombok.org/download

2運行jar包，添加到eclipse目錄下

點擊install/update按鈕，即可安裝完成

檢查eclipse.ini文件最後是否添加了jar包

3然後重啓一下eclipse,

4最重要的是需要在maven中引入

<dependency>

<groupId>org.projectlombok</groupId>

<artifactId>lombok</artifactId>

<version>1.16.6</version>

</dependency>

比較一下：

原來的代碼

public class EnergySource {

    private String energySourceId;
    private String fuel;
    private String industrialWater;
    private String gas;
    private String naturlGas;
    private String steam;
    private String oxygenNitrogen;
    private String compressedAir;
    private String dynamicMedium;
    public String getEnergySourceId() {
        return energySourceId;
    }
    public String getFuel() {
        return fuel;
    }
    public String getIndustrialWater() {
        return industrialWater;
    }
    public String getGas() {
        return gas;
    }
    public String getNaturlGas() {
        return naturlGas;
    }
    public String getSteam() {
        return steam;
    }
    public String getOxygenNitrogen() {
        return oxygenNitrogen;
    }
    public String getCompressedAir() {
        return compressedAir;
    }
    public String getDynamicMedium() {
        return dynamicMedium;
    }
    public void setEnergySourceId(String energySourceId) {
        this.energySourceId = energySourceId;
    }
    public void setFuel(String fuel) {
        this.fuel = fuel;
    }
    public void setIndustrialWater(String industrialWater) {
        this.industrialWater = industrialWater;
    }
    public void setGas(String gas) {
        this.gas = gas;
    }
    public void setNaturlGas(String naturlGas) {
        this.naturlGas = naturlGas;
    }
    public void setSteam(String steam) {
        this.steam = steam;
    }
    public void setOxygenNitrogen(String oxygenNitrogen) {
        this.oxygenNitrogen = oxygenNitrogen;
    }
    public void setCompressedAir(String compressedAir) {
        this.compressedAir = compressedAir;
    }
    public void setDynamicMedium(String dynamicMedium) {
        this.dynamicMedium = dynamicMedium;
    }
    @Override
    public String toString() {
        return "EnergySource [energySourceId=" + energySourceId + ", fuel=" + fuel + ", industrialWater="
                + industrialWater + ", gas=" + gas + ", naturlGas=" + naturlGas + ", steam=" + steam
                + ", oxygenNitrogen=" + oxygenNitrogen + ", compressedAir=" + compressedAir + ", dynamicMedium="
                + dynamicMedium + "]";
    }

}

加註解的代碼

import lombok.Data;

@Data
public class EnergySource {

    private String energySourceId;
    private String fuel;
    private String industrialWater;
    private String gas;
    private String naturlGas;
    private String steam;
    private String oxygenNitrogen;
    private String compressedAir;
    private String dynamicMedium;

}

還有一些提供的註解：

        @Data   ：註解在類上；提供類所有屬性的 getting 和 setting 方法，此外還提供了equals、canEqual、hashCode、toString 方法

        @Setter：註解在屬性上；爲屬性提供 setting 方法

        @Getter：註解在屬性上；爲屬性提供 getting 方法

        @Log4j ：註解在類上；爲類提供一個 屬性名爲log 的 log4j 日誌對象

        @NoArgsConstructor：註解在類上；爲類提供一個無參的構造方法

        @AllArgsConstructor：註解在類上；爲類提供一個全參的構造方法