org.dromara.hutool.core.reflect

Class ClassDescUtil

java.lang.Object

org.dromara.hutool.core.reflect.ClassDescUtil

public class ClassDescUtil
extends Object

类描述工具类
来自：org.apache.dubbo.common.utils.ReflectUtils
在字节码中，类型表示如下：

• byte =》 B
• char =》 C
• double =》 D
• long =》 J
• short =》 S
• boolean =》 Z
• void =》 V
• 对象类型以“L”开头，“;”结尾，如Ljava/lang/Object;
• 数组类型，每一位使用一个前置的[字符来描述，如：java.lang.String[][] =》 [[Ljava/lang/String;

此类旨在通过类描述信息和类名查找对应的类，如动态加载类等。

Since:

6.0.0

Author:

Dubbo

Field Summary

Fields

Modifier and Type	Field and Description
static char	JVM_BOOLEAN boolean(Z).
static char	JVM_BYTE byte(B).
static char	JVM_CHAR char(C).
static char	JVM_DOUBLE double(D).
static char	JVM_FLOAT float(F).
static char	JVM_INT int(I).
static char	JVM_LONG long(J).
static char	JVM_SHORT short(S).
static char	JVM_VOID void(V).

Constructor Summary

Constructors

Constructor and Description
ClassDescUtil()

Method Summary

Modifier and Type	Method and Description
static Class<?>	descToClass(String desc) Class描述转Class "[Z" => boolean[].class "[[Ljava/util/Map;" => java.util.Map[][].class
static Class<?>	descToClass(String desc, boolean isInitialized, ClassLoader cl) Class描述转Class "[Z" => boolean[].class "[[Ljava/util/Map;" => java.util.Map[][].class
static String	descToName(String desc) 类描述转名称 "[[I" => "int[][]"
static String	getCodeBase(Class<?> clazz) 获取code base
static String	getDesc(Class<?> c) 获取类描述，这是编译成class文件后的二进制名称 getDesc(boolean.class) // Z getDesc(Boolean.class) // Ljava/lang/Boolean; getDesc(double[][][].class) // [[[D getDesc(int.class) // I getDesc(Integer.class) // Ljava/lang/Integer;
static String	getDesc(Executable methodOrConstructor, boolean appendName) 获取方法或构造描述 方法（appendName为true）： int do(int arg1) => "do(I)I" void do(String arg1,boolean arg2) => "do(Ljava/lang/String;Z)V" 构造： "()V", "(Ljava/lang/String;I)V" 当appendName为false时： getDesc(Object.class.getMethod("hashCode")) // ()I getDesc(Object.class.getMethod("toString")) // ()Ljava/lang/String; getDesc(Object.class.getMethod("equals", Object.class)) // (Ljava/lang/Object;)Z getDesc(ArrayUtil.class.getMethod("isEmpty", Object[].class)) // "([Ljava/lang/Object;)Z"
static String	getName(Class<?> c) 获得类名称 数组输出xxx[]形式，其它类调用Class.getName() java.lang.Object[][].class => "java.lang.Object[][]"
static String	getName(Executable executable) 获取构造或方法的名称表示 构造： "()", "(java.lang.String,int)" 方法： "void do(int)", "void do()", "int do(java.lang.String,boolean)"
static Class<?>	nameToClass(String name, boolean isInitialized, ClassLoader cl) 类名称转类 "boolean" => boolean.class "java.util.Map[][]" => java.util.Map[][].class
static String	nameToDesc(String name) 类名称转描述 java.util.Map[][] => "[[Ljava/util/Map;"

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

JVM_VOID

public static final char JVM_VOID

void(V).

See Also:

Constant Field Values

JVM_BOOLEAN

public static final char JVM_BOOLEAN

boolean(Z).

See Also:

Constant Field Values

JVM_BYTE

public static final char JVM_BYTE

byte(B).

See Also:

Constant Field Values

JVM_CHAR

public static final char JVM_CHAR

char(C).

See Also:

Constant Field Values

JVM_DOUBLE

public static final char JVM_DOUBLE

double(D).

See Also:

Constant Field Values

JVM_FLOAT

public static final char JVM_FLOAT

float(F).

See Also:

Constant Field Values

JVM_INT

public static final char JVM_INT

int(I).

See Also:

Constant Field Values

JVM_LONG

public static final char JVM_LONG

long(J).

See Also:

Constant Field Values

JVM_SHORT

public static final char JVM_SHORT

short(S).

See Also:

Constant Field Values

Constructor Detail

ClassDescUtil

public ClassDescUtil()

Method Detail

descToClass

public static Class<?> descToClass(String desc)
                            throws HutoolException

Class描述转Class

 "[Z" => boolean[].class
 "[[Ljava/util/Map;" => java.util.Map[][].class
 

Parameters:

desc - 类描述

Returns:

Class

Throws:

HutoolException - 类没有找到

descToClass

public static Class<?> descToClass(String desc,
                                   boolean isInitialized,
                                   ClassLoader cl)
                            throws HutoolException

Class描述转Class

 "[Z" => boolean[].class
 "[[Ljava/util/Map;" => java.util.Map[][].class
 

Parameters:

desc - 类描述

isInitialized - 是否初始化类

cl - ClassLoader

Returns:

Class

Throws:

HutoolException - 类没有找到

getDesc

public static String getDesc(Class<?> c)

获取类描述，这是编译成class文件后的二进制名称

    getDesc(boolean.class)       // Z
    getDesc(Boolean.class)       // Ljava/lang/Boolean;
    getDesc(double[][][].class)  // [[[D
    getDesc(int.class)           // I
    getDesc(Integer.class)       // Ljava/lang/Integer;
 

Parameters:

c - class.

Returns:

desc.

See Also:

jvm定义的Field Descriptors（字段描述）, 关于类型描述符的博客

getDesc

public static String getDesc(Executable methodOrConstructor,
                             boolean appendName)

获取方法或构造描述
方法（appendName为true）：

    int do(int arg1) => "do(I)I"
    void do(String arg1,boolean arg2) => "do(Ljava/lang/String;Z)V"
 

构造：

    "()V", "(Ljava/lang/String;I)V"
 

当appendName为false时：

    getDesc(Object.class.getMethod("hashCode"))                    // ()I
    getDesc(Object.class.getMethod("toString"))                    // ()Ljava/lang/String;
    getDesc(Object.class.getMethod("equals", Object.class))        // (Ljava/lang/Object;)Z
    getDesc(ArrayUtil.class.getMethod("isEmpty", Object[].class))  // "([Ljava/lang/Object;)Z"
 

Parameters:

methodOrConstructor - 方法或构造

appendName - 是否包含方法名称

Returns:

描述

See Also:

jvm定义的Field Descriptors（字段描述）, 关于类型描述符的博客

getName

public static String getName(Class<?> c)

获得类名称
数组输出xxx[]形式，其它类调用Class.getName()

 java.lang.Object[][].class => "java.lang.Object[][]"
 

Parameters:

c - 类

Returns:

类名称

getName

public static String getName(Executable executable)

获取构造或方法的名称表示
构造：

 "()", "(java.lang.String,int)"
 

方法：

     "void do(int)", "void do()", "int do(java.lang.String,boolean)"
 

Parameters:

executable - 方法或构造

Returns:

名称

nameToClass

public static Class<?> nameToClass(String name,
                                   boolean isInitialized,
                                   ClassLoader cl)

类名称转类

 "boolean" => boolean.class
 "java.util.Map[][]" => java.util.Map[][].class
 

Parameters:

name - name.

isInitialized - 是否初始化类

cl - ClassLoader instance.

Returns:

Class instance.

nameToDesc

public static String nameToDesc(String name)

类名称转描述

 java.util.Map[][] => "[[Ljava/util/Map;"
 

Parameters:

name - 名称

Returns:

描述

descToName

public static String descToName(String desc)

类描述转名称

 "[[I" => "int[][]"
 

Parameters:

desc - 描述

Returns:

名称

getCodeBase

public static String getCodeBase(Class<?> clazz)

获取code base

Parameters:

clazz - 类

Returns:

code base