lombok使用手册:

1、安装插件

1.1、idel:

elipse:下载地址https://projectlombok.org/download

运行jar文件

1.2、使用lombok还需要引用相关jar包

参考网址:https://projectlombok.org/features/all

2、注解说明

2.1、@Data

@Data
All together now: A shortcut for @ToString, @EqualsAndHashCode, @Getter on all fields, and @Setter on all non-final fields, and @RequiredArgsConstructor!
Lombok代码:

@Data
public class Lombok {
private String name;
private String age;
}

编译后代码:

public class Lombok {
private String name;
private String age; public Lombok() {
} public String getName() {
return this.name;
} public String getAge() {
return this.age;
} public void setName(String name) {
this.name = name;
} public void setAge(String age) {
this.age = age;
} public boolean equals(Object o) {
if(o == this) {
return true;
} else if(!(o instanceof Lombok)) {
return false;
} else {
Lombok other = (Lombok)o;
if(!other.canEqual(this)) {
return false;
} else {
String this$name = this.getName();
String other$name = other.getName();
if(this$name == null) {
if(other$name != null) {
return false;
}
} else if(!this$name.equals(other$name)) {
return false;
} String this$age = this.getAge();
String other$age = other.getAge();
if(this$age == null) {
if(other$age != null) {
return false;
}
} else if(!this$age.equals(other$age)) {
return false;
} return true;
}
}
} protected boolean canEqual(Object other) {
return other instanceof Lombok;
} public int hashCode() {
boolean PRIME = true;
byte result = 1;
String $name = this.getName();
int result1 = result * 59 + ($name == null?43:$name.hashCode());
String $age = this.getAge();
result1 = result1 * 59 + ($age == null?43:$age.hashCode());
return result1;
} public String toString() {
return "Lombok(name=" + this.getName() + ", age=" + this.getAge() + ")";
}
}

2.2、@val

编译前代码:

    val example = new ArrayList<String>();
example.add("Hello, World!");
val foo = example.get(0);
return foo.toLowerCase(); val map = new HashMap<Integer, String>();
map.put(0, "zero");
map.put(5, "five");
for (val entry : map.entrySet()) {
System.out.printf("%d: %s\n", entry.getKey(), entry.getValue());
}

编译后代码:

    final ArrayList<String> example = new ArrayList<String>();
example.add("Hello, World!");
final String foo = example.get(0);
return foo.toLowerCase(); final HashMap<Integer, String> map = new HashMap<Integer, String>();
map.put(0, "zero");
map.put(5, "five");
for (final Map.Entry<Integer, String> entry : map.entrySet()) {
System.out.printf("%d: %s\n", entry.getKey(), entry.getValue());
}

2.3、@var 用法参考@val

2.4、@NonNull

编译前代码:

  public NonNullExample(@NonNull Person person) {
this.name = person.getName();
}

编译后代码:

public NonNullExample(@NonNull Person person) {
if (person == null) {
throw new NullPointerException("person is marked @NonNull but is null");
}
this.name = person.getName();
}

2.5、@Cleanup

编译前代码:

    @Cleanup InputStream in = new FileInputStream(args[0]);
@Cleanup OutputStream out = new FileOutputStream(args[1]);
byte[] b = new byte[10000];
while (true) {
int r = in.read(b);
if (r == -1) break;
out.write(b, 0, r);
}

编译后代码:

    InputStream in = new FileInputStream(args[0]);
try {
OutputStream out = new FileOutputStream(args[1]);
try {
byte[] b = new byte[10000];
while (true) {
int r = in.read(b);
if (r == -1) break;
out.write(b, 0, r);
}
} finally {
if (out != null) {
out.close();
}
}
} finally {
if (in != null) {
in.close();
}
}

2.6、@Getter、@Setter

编译前代码:

  @Getter @Setter private int age = 10;
@Setter private String name;

编译后代码:

  public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
protected void setName(String name) {
this.name = name;
}

2.7、@ToString

编译前代码:

@ToString
public class Lombok {
@Getter @Setter String name;
@Getter @Setter private String age;
@ToString.Exclude String id;
}

编译后代码:

public class Lombok {
String name;
private String age;
String id; public Lombok() {
} public String toString() {
return "Lombok(name=" + this.getName() + ", age=" + this.getAge() + ")";
} public String getName() {
return this.name;
} public void setName(String name) {
this.name = name;
} public String getAge() {
return this.age;
} public void setAge(String age) {
this.age = age;
}
}

2.8、@EqualsAndHashCode

编译前代码:

@EqualsAndHashCode
public class Lombok {
@Getter @Setter String name;
@Getter @Setter private String age;
@EqualsAndHashCode.Exclude String id;
}

编译后代码:

public class Lombok {
String name;
private String age;
String id; public Lombok() {
} public boolean equals(Object o) {
if(o == this) {
return true;
} else if(!(o instanceof Lombok)) {
return false;
} else {
Lombok other = (Lombok)o;
if(!other.canEqual(this)) {
return false;
} else {
String this$name = this.getName();
String other$name = other.getName();
if(this$name == null) {
if(other$name != null) {
return false;
}
} else if(!this$name.equals(other$name)) {
return false;
} String this$age = this.getAge();
String other$age = other.getAge();
if(this$age == null) {
if(other$age != null) {
return false;
}
} else if(!this$age.equals(other$age)) {
return false;
} return true;
}
}
} protected boolean canEqual(Object other) {
return other instanceof Lombok;
} public int hashCode() {
boolean PRIME = true;
byte result = 1;
String $name = this.getName();
int result1 = result * 59 + ($name == null?43:$name.hashCode());
String $age = this.getAge();
result1 = result1 * 59 + ($age == null?43:$age.hashCode());
return result1;
} public String getName() {
return this.name;
} public void setName(String name) {
this.name = name;
} public String getAge() {
return this.age;
} public void setAge(String age) {
this.age = age;
}
}

2.9、@NoArgsConstructor, @RequiredArgsConstructor, @AllArgsConstructor构造器

编译前代码:

@RequiredArgsConstructor(staticName = "of")
@AllArgsConstructor(access = AccessLevel.PROTECTED)
public class ConstructorExample<T> {
private int x, y;
@NonNull private T description; @NoArgsConstructor
public static class NoArgsExample {
@NonNull private String field;
}
}

编译后代码:

 public class ConstructorExample<T> {
private int x, y;
@NonNull private T description; private ConstructorExample(T description) {
if (description == null) throw new NullPointerException("description");
this.description = description;
} public static <T> ConstructorExample<T> of(T description) {
return new ConstructorExample<T>(description);
} @java.beans.ConstructorProperties({"x", "y", "description"})
protected ConstructorExample(int x, int y, T description) {
if (description == null) throw new NullPointerException("description");
this.x = x;
this.y = y;
this.description = description;
} public static class NoArgsExample {
@NonNull private String field; public NoArgsExample() {
}
}
}

2.10、@Value用法参考@Data默认设置为final,会被其他注解显示生效

2.11、@Builder

编译前代码:

@Builder
public class BuilderExample {
@Builder.Default private long created = System.currentTimeMillis();
private String name;
private int age;
@Singular
private Set<String> occupations;
}

编译后代码:

public class BuilderExample {
private long created;
private String name;
private int age;
private Set<String> occupations; private static long $default$created() {
return System.currentTimeMillis();
} BuilderExample(long created, String name, int age, Set<String> occupations) {
this.created = created;
this.name = name;
this.age = age;
this.occupations = occupations;
} public static BuilderExample.BuilderExampleBuilder builder() {
return new BuilderExample.BuilderExampleBuilder();
} public static class BuilderExampleBuilder {
private boolean created$set;
private long created$value;
private String name;
private int age;
private ArrayList<String> occupations; BuilderExampleBuilder() {
} public BuilderExample.BuilderExampleBuilder created(long created) {
this.created$value = created;
this.created$set = true;
return this;
} public BuilderExample.BuilderExampleBuilder name(String name) {
this.name = name;
return this;
} public BuilderExample.BuilderExampleBuilder age(int age) {
this.age = age;
return this;
} public BuilderExample.BuilderExampleBuilder occupation(String occupation) {
if(this.occupations == null) {
this.occupations = new ArrayList();
} this.occupations.add(occupation);
return this;
} public BuilderExample.BuilderExampleBuilder occupations(Collection<? extends String> occupations) {
if(this.occupations == null) {
this.occupations = new ArrayList();
} this.occupations.addAll(occupations);
return this;
} public BuilderExample.BuilderExampleBuilder clearOccupations() {
if(this.occupations != null) {
this.occupations.clear();
} return this;
} public BuilderExample build() {
Set occupations;
switch(this.occupations == null?0:this.occupations.size()) {
case 0:
occupations = Collections.emptySet();
break;
case 1:
occupations = Collections.singleton(this.occupations.get(0));
break;
default:
LinkedHashSet occupations1 = new LinkedHashSet(this.occupations.size() < 1073741824?1 + this.occupations.size() + (this.occupations.size() - 3) / 3:2147483647);
occupations1.addAll(this.occupations);
occupations = Collections.unmodifiableSet(occupations1);
} long created$value = this.created$value;
if(!this.created$set) {
created$value = System.currentTimeMillis();
} return new BuilderExample(created$value, this.name, this.age, occupations);
} public String toString() {
return "BuilderExample.BuilderExampleBuilder(created$value=" + this.created$value + ", name=" + this.name + ", age=" + this.age + ", occupations=" + this.occupations + ")";
}
}
}

2.12、@SneakyThrows

编译前代码:

 @SneakyThrows(UnsupportedEncodingException.class)
public String utf8ToString(byte[] bytes) {
return new String(bytes, "UTF-8");
} @SneakyThrows
public void run() {
throw new Throwable();
}

编译后代码:

  public String utf8ToString(byte[] bytes) {
try {
return new String(bytes, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw Lombok.sneakyThrow(e);
}
} public void run() {
try {
throw new Throwable();
} catch (Throwable t) {
throw Lombok.sneakyThrow(t);
}
}

2.13、@Synchronized

编译前代码:

public class SynchronizedExample {
private final Object readLock = new Object(); @Synchronized
public static void hello() {
System.out.println("world");
} @Synchronized
public int answerToLife() {
return 42;
} @Synchronized("readLock")
public void foo() {
System.out.println("bar");
}
}

编译后代码:

 public class SynchronizedExample {
private static final Object $LOCK = new Object[0];
private final Object $lock = new Object[0];
private final Object readLock = new Object(); public static void hello() {
synchronized($LOCK) {
System.out.println("world");
}
} public int answerToLife() {
synchronized($lock) {
return 42;
}
} public void foo() {
synchronized(readLock) {
System.out.println("bar");
}
}
}

2.14、@With 必须要包含全参数构造器

编译前代码:

@AllArgsConstructor
public class Lombok {
@With private Integer x;
@With private Integer y;
@With private Integer z;
}

编译后代码:

public class Lombok {
private Integer x;
private Integer y;
private Integer z; public Lombok(Integer x, Integer y, Integer z) {
this.x = x;
this.y = y;
this.z = z;
} public Lombok withX(Integer x) {
return this.x == x?this:new Lombok(x, this.y, this.z);
} public Lombok withY(Integer y) {
return this.y == y?this:new Lombok(this.x, y, this.z);
} public Lombok withZ(Integer z) {
return this.z == z?this:new Lombok(this.x, this.y, z);
}
}

2.15、@Getter(lazy=true)缓存

编译前代码:

public class Lombok {
@Getter(lazy=true) private final int[] cached = expensive(); private int[] expensive() {
int[] result = new int[1000000];
for (int i = 0; i < result.length; i++) {
result[i] = i;
}
return result;
}
}

编译后代码:

public class Lombok {
private final AtomicReference<Object> cached = new AtomicReference(); public Lombok() {
} private int[] expensive() {
int[] result = new int[1000000]; for(int i = 0; i < result.length; result[i] = i++) {
;
} return result;
} public int[] getCached() {
Object value = this.cached.get();
if(value == null) {
AtomicReference var2 = this.cached;
synchronized(this.cached) {
value = this.cached.get();
if(value == null) {
int[] actualValue = this.expensive();
value = actualValue == null?this.cached:actualValue;
this.cached.set(value);
}
}
} return (int[])((int[])(value == this.cached?null:value));
}
}

2.16、日志@Log (and friends)

@CommonsLog
    Creates private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(LogExample.class);
@Flogger
    Creates private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingClass();
@JBossLog
    Creates private static final org.jboss.logging.Logger log = org.jboss.logging.Logger.getLogger(LogExample.class);
@Log
    Creates private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(LogExample.class.getName());
@Log4j
    Creates private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(LogExample.class);
@Log4j2
    Creates private static final org.apache.logging.log4j.Logger log = org.apache.logging.log4j.LogManager.getLogger(LogExample.class);
@Slf4j
    Creates private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(LogExample.class);
@XSlf4j
    Creates private static final org.slf4j.ext.XLogger log = org.slf4j.ext.XLoggerFactory.getXLogger(LogExample.class);
@CustomLog
    Creates private static final com.foo.your.Logger log = com.foo.your.LoggerFactory.createYourLogger(LogExample.class);

@Log
public class Lombok {
@Getter(lazy=true) private final int[] cached = expensive(); private int[] expensive() {
int[] result = new int[1000000];
for (int i = 0; i < result.length; i++) {
result[i] = i;
}
log.severe(result.toString());
return result;
}
}

2.17、额外的注解见链接https://projectlombok.org/features/all

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