如何查看java的class文件

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?  ~ java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
?  ~ 
?  ~ 
?  ~ cd /Users/shiwen/IdeaProjects/springcloud/example-springcloud-provider/target/classes/com/example/springcloud/provider/hello/                     
?  hello git:(master) ? ll
total 8
-rw-r--r--  1 shiwen  staff   1.9K 10 11 13:06 HelloController.class
?  hello git:(master) ? javap -v HelloController.class
Classfile /Users/shiwen/IdeaProjects/springcloud/example-springcloud-provider/target/classes/com/example/springcloud/provider/hello/HelloController.class
  Last modified 2017-10-11; size 1965 bytes
  MD5 checksum b2b6778d4662b520c0b210239844a73a
  Compiled from "HelloController.java"
public class com.example.springcloud.provider.hello.HelloController
  minor version: 0
  major version: 52
  flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
   #1 = Methodref          #18.#50        // java/lang/Object."<init>":()V
   #2 = Fieldref           #16.#51        // com/example/springcloud/provider/hello/HelloController.client:Lorg/springframework/cloud/client/discovery/DiscoveryClient;
   #3 = InterfaceMethodref #52.#53        // org/springframework/cloud/client/discovery/DiscoveryClient.getLocalServiceInstance:()Lorg/springframework/cloud/client/ServiceInstance;
   #4 = Class              #54            // java/lang/StringBuilder
   #5 = Methodref          #4.#50         // java/lang/StringBuilder."<init>":()V
   #6 = String             #55            // hello,success!host=
   #7 = Methodref          #4.#56         // java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   #8 = InterfaceMethodref #57.#58        // org/springframework/cloud/client/ServiceInstance.getHost:()Ljava/lang/String;
   #9 = String             #59            // ,serviceId=
  #10 = InterfaceMethodref #57.#60        // org/springframework/cloud/client/ServiceInstance.getServiceId:()Ljava/lang/String;
  #11 = Methodref          #4.#61         // java/lang/StringBuilder.toString:()Ljava/lang/String;
  #12 = Fieldref           #16.#62        // com/example/springcloud/provider/hello/HelloController.logger:Lorg/slf4j/Logger;
  #13 = InterfaceMethodref #63.#64        // org/slf4j/Logger.info:(Ljava/lang/String;)V
  #14 = String             #65            // hello
  #15 = String             #66            // ，this is first messge
  #16 = Class              #67            // com/example/springcloud/provider/hello/HelloController
  #17 = Methodref          #68.#69        // org/slf4j/LoggerFactory.getLogger:(Ljava/lang/Class;)Lorg/slf4j/Logger;
  #18 = Class              #70            // java/lang/Object
  #19 = Utf8               logger
  #20 = Utf8               Lorg/slf4j/Logger;
  #21 = Utf8               client
  #22 = Utf8               Lorg/springframework/cloud/client/discovery/DiscoveryClient;
  #23 = Utf8               RuntimeVisibleAnnotations
  #24 = Utf8               Lorg/springframework/beans/factory/annotation/Autowired;
  #25 = Utf8               <init>
  #26 = Utf8               ()V
  #27 = Utf8               Code
  #28 = Utf8               LineNumberTable
  #29 = Utf8               LocalVariableTable
  #30 = Utf8               this
  #31 = Utf8               Lcom/example/springcloud/provider/hello/HelloController;
  #32 = Utf8               index
  #33 = Utf8               ()Ljava/lang/String;
  #34 = Utf8               instance
  #35 = Utf8               Lorg/springframework/cloud/client/ServiceInstance;
  #36 = Utf8               hello
  #37 = Utf8               Ljava/lang/String;
  #38 = Utf8               Lorg/springframework/web/bind/annotation/RequestMapping;
  #39 = Utf8               value
  #40 = Utf8               /
  #41 = Utf8               (Ljava/lang/String;)Ljava/lang/String;
  #42 = Utf8               name
  #43 = Utf8               /hello
  #44 = Utf8               RuntimeVisibleParameterAnnotations
  #45 = Utf8               Lorg/springframework/web/bind/annotation/RequestParam;
  #46 = Utf8               <clinit>
  #47 = Utf8               SourceFile
  #48 = Utf8               HelloController.java
  #49 = Utf8               Lorg/springframework/web/bind/annotation/RestController;
  #50 = NameAndType        #25:#26        // "<init>":()V
  #51 = NameAndType        #21:#22        // client:Lorg/springframework/cloud/client/discovery/DiscoveryClient;
  #52 = Class              #71            // org/springframework/cloud/client/discovery/DiscoveryClient
  #53 = NameAndType        #72:#73        // getLocalServiceInstance:()Lorg/springframework/cloud/client/ServiceInstance;
  #54 = Utf8               java/lang/StringBuilder
  #55 = Utf8               hello,success!host=
  #56 = NameAndType        #74:#75        // append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
  #57 = Class              #76            // org/springframework/cloud/client/ServiceInstance
  #58 = NameAndType        #77:#33        // getHost:()Ljava/lang/String;
  #59 = Utf8               ,serviceId=
  #60 = NameAndType        #78:#33        // getServiceId:()Ljava/lang/String;
  #61 = NameAndType        #79:#33        // toString:()Ljava/lang/String;
  #62 = NameAndType        #19:#20        // logger:Lorg/slf4j/Logger;
  #63 = Class              #80            // org/slf4j/Logger
  #64 = NameAndType        #81:#82        // info:(Ljava/lang/String;)V
  #65 = Utf8               hello
  #66 = Utf8               ，this is first messge
  #67 = Utf8               com/example/springcloud/provider/hello/HelloController
  #68 = Class              #83            // org/slf4j/LoggerFactory
  #69 = NameAndType        #84:#85        // getLogger:(Ljava/lang/Class;)Lorg/slf4j/Logger;
  #70 = Utf8               java/lang/Object
  #71 = Utf8               org/springframework/cloud/client/discovery/DiscoveryClient
  #72 = Utf8               getLocalServiceInstance
  #73 = Utf8               ()Lorg/springframework/cloud/client/ServiceInstance;
  #74 = Utf8               append
  #75 = Utf8               (Ljava/lang/String;)Ljava/lang/StringBuilder;
  #76 = Utf8               org/springframework/cloud/client/ServiceInstance
  #77 = Utf8               getHost
  #78 = Utf8               getServiceId
  #79 = Utf8               toString
  #80 = Utf8               org/slf4j/Logger
  #81 = Utf8               info
  #82 = Utf8               (Ljava/lang/String;)V
  #83 = Utf8               org/slf4j/LoggerFactory
  #84 = Utf8               getLogger
  #85 = Utf8               (Ljava/lang/Class;)Lorg/slf4j/Logger;
{
  public com.example.springcloud.provider.hello.HelloController();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: return
      LineNumberTable:
        line 13: 0
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       5     0  this   Lcom/example/springcloud/provider/hello/HelloController;

  public java.lang.String index();
    descriptor: ()Ljava/lang/String;
    flags: ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=1
         0: aload_0
         1: getfield      #2                  // Field client:Lorg/springframework/cloud/client/discovery/DiscoveryClient;
         4: invokeinterface #3,  1            // InterfaceMethod org/springframework/cloud/client/discovery/DiscoveryClient.getLocalServiceInstance:()Lorg/springframework/cloud/client/ServiceInstance;
         9: astore_1
        10: new           #4                  // class java/lang/StringBuilder
        13: dup
        14: invokespecial #5                  // Method java/lang/StringBuilder."<init>":()V
        17: ldc           #6                  // String hello,success!host=
        19: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        22: aload_1
        23: invokeinterface #8,  1            // InterfaceMethod org/springframework/cloud/client/ServiceInstance.getHost:()Ljava/lang/String;
        28: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        31: ldc           #9                  // String ,serviceId=
        33: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        36: aload_1
        37: invokeinterface #10,  1           // InterfaceMethod org/springframework/cloud/client/ServiceInstance.getServiceId:()Ljava/lang/String;
        42: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        45: invokevirtual #11                 // Method java/lang/StringBuilder.toString:()Ljava/lang/String;
        48: astore_2
        49: getstatic     #12                 // Field logger:Lorg/slf4j/Logger;
        52: aload_2
        53: invokeinterface #13,  2           // InterfaceMethod org/slf4j/Logger.info:(Ljava/lang/String;)V
        58: aload_2
        59: areturn
      LineNumberTable:
        line 22: 0
        line 23: 10
        line 24: 49
        line 25: 58
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0      60     0  this   Lcom/example/springcloud/provider/hello/HelloController;
           10      50     1 instance   Lorg/springframework/cloud/client/ServiceInstance;
           49      11     2 hello   Ljava/lang/String;
    RuntimeVisibleAnnotations:
      0: #38(#39=[s#40])

  public java.lang.String hello(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
         0: new           #4                  // class java/lang/StringBuilder
         3: dup
         4: invokespecial #5                  // Method java/lang/StringBuilder."<init>":()V
         7: ldc           #14                 // String hello
         9: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        12: aload_1
        13: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        16: ldc           #15                 // String ，this is first messge
        18: invokevirtual #7                  // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        21: invokevirtual #11                 // Method java/lang/StringBuilder.toString:()Ljava/lang/String;
        24: areturn
      LineNumberTable:
        line 31: 0
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0      25     0  this   Lcom/example/springcloud/provider/hello/HelloController;
            0      25     1  name   Ljava/lang/String;
    RuntimeVisibleAnnotations:
      0: #38(#39=[s#43])
    RuntimeVisibleParameterAnnotations:
      parameter 0:
        0: #45()

  static {};
    descriptor: ()V
    flags: ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: ldc           #16                 // class com/example/springcloud/provider/hello/HelloController
         2: invokestatic  #17                 // Method org/slf4j/LoggerFactory.getLogger:(Ljava/lang/Class;)Lorg/slf4j/Logger;
         5: putstatic     #12                 // Field logger:Lorg/slf4j/Logger;
         8: return
      LineNumberTable:
        line 14: 0
}
SourceFile: "HelloController.java"
RuntimeVisibleAnnotations:
  0: #49()