jar包解压与查看class文件

2023年12月2日发(作者：)

jar包解压与查看class文件今天在排查问题时，想看看生产上面的包里面代码是怎样的，具体流程如下：随便找个包（）1 解压jar包jar -xvf 2 使用javap命令查看class文件内容javap -v -p 输出如下：public final class ArrayConverter extends ctArrayConverter minor version: 0 major version: 46 flags: ACC_PUBLIC, ACC_FINAL, ACC_SUPERConstant pool: #1 = Methodref #28.#58 // org/apache/commons/beanutils/converters/AbstractArrayConverter."":()V #2 = Fieldref #27.#59 // org/apache/commons/beanutils/converters/tValue:Ljava/lang/Object; #3 = Fieldref #27.#60 // org/apache/commons/beanutils/converters/ault:Z #4 = Fieldref #27.#59 // org/apache/commons/beanutils/converters/tValue:Ljava/lang/Object; #5 = Fieldref #27.#60 // org/apache/commons/beanutils/converters/ault:Z #6 = Fieldref #27.#60 // org/apache/commons/beanutils/converters/ault:Z #7 = Fieldref #27.#59 // org/apache/commons/beanutils/converters/tValue:Ljava/lang/Object; #8 = Class #61 // org/apache/commons/beanutils/ConversionException #9 = String #62 // No value specified #10 = Methodref #8.#63 // org/apache/commons/beanutils/ConversionException."":(Ljava/lang/String;)V #11 = Fieldref #27.#64 // org/apache/commons/beanutils/converters/:[D #12 = Methodref #65.#66 // java/lang/ss:()Ljava/lang/Class; #13 = Fieldref #28.#67 // org/apache/commons/beanutils/converters/s:[Ljava/lang/String; #14 = Class #47 // "[Ljava/lang/String;" #15 = Methodref #68.#69 // java/lang/ouble:(Ljava/lang/String;)D #16 = Class #70 // java/lang/Exception #17 = Fieldref #27.#60 // org/apache/commons/beanutils/converters/ault:Z #18 = Fieldref #27.#59 // org/apache/commons/beanutils/converters/tValue:Ljava/lang/Object; #19 = Methodref #65.#71 // java/lang/ng:()Ljava/lang/String; #20 = Methodref #8.#72 // org/apache/commons/beanutils/ConversionException."":(Ljava/lang/String;Ljava/lang/Throwable;)V #21 = Methodref #27.#73 // org/apache/commons/beanutils/converters/lements:(Ljava/lang/String;)Ljava/util/List; #22 = InterfaceMethodref #74.#75 // java/util/:()I #23 = InterfaceMethodref #74.#76 // java/util/:(I)Ljava/lang/Object; #24 = Class #77 // java/lang/String #25 = Fieldref #27.#60 // org/apache/commons/beanutils/converters/ault:Z #26 = Fieldref #27.#59 // org/apache/commons/beanutils/converters/tValue:Ljava/lang/Object; #27 = Class #78 // org/apache/commons/beanutils/converters/DoubleArrayConverter #28 = Class #79 // org/apache/commons/beanutils/converters/AbstractArrayConverter #29 = Utf8 model #30 = Utf8 [D #31 = Utf8 #32 = Utf8 ()V #33 = Utf8 Code #34 = Utf8 LineNumberTable #35 = Utf8 LocalVariableTable #36 = Utf8 this #37 = Utf8 Lorg/apache/commons/beanutils/converters/DoubleArrayConverter; #38 = Utf8 (Ljava/lang/Object;)V #39 = Utf8 defaultValue #40 = Utf8 Ljava/lang/Object; #41 = Utf8 convert #42 = Utf8 (Ljava/lang/Class;Ljava/lang/Object;)Ljava/lang/Object; #43 = Utf8 type #44 = Utf8 Ljava/lang/Class; #45 = Utf8 value #46 = Utf8 values #46 = Utf8 values #47 = Utf8 [Ljava/lang/String; #48 = Utf8 results #49 = Utf8 i #50 = Utf8 I #51 = Utf8 e #52 = Utf8 Ljava/lang/Exception; #53 = Utf8 list #54 = Utf8 Ljava/util/List; #55 = Utf8 #56 = Utf8 SourceFile #57 = Utf8 #58 = NameAndType #31:#32 // "":()V #59 = NameAndType #39:#40 // defaultValue:Ljava/lang/Object; #60 = NameAndType #80:#81 // useDefault:Z #61 = Utf8 org/apache/commons/beanutils/ConversionException #62 = Utf8 No value specified #63 = NameAndType #31:#82 // "":(Ljava/lang/String;)V #64 = NameAndType #29:#30 // model:[D #65 = Class #83 // java/lang/Object #66 = NameAndType #84:#85 // getClass:()Ljava/lang/Class; #67 = NameAndType #86:#47 // strings:[Ljava/lang/String; #68 = Class #87 // java/lang/Double #69 = NameAndType #88:#89 // parseDouble:(Ljava/lang/String;)D #70 = Utf8 java/lang/Exception #71 = NameAndType #90:#91 // toString:()Ljava/lang/String; #72 = NameAndType #31:#92 // "":(Ljava/lang/String;Ljava/lang/Throwable;)V #73 = NameAndType #93:#94 // parseElements:(Ljava/lang/String;)Ljava/util/List; #74 = Class #95 // java/util/List #75 = NameAndType #96:#97 // size:()I #76 = NameAndType #98:#99 // get:(I)Ljava/lang/Object; #77 = Utf8 java/lang/String #78 = Utf8 org/apache/commons/beanutils/converters/DoubleArrayConverter #79 = Utf8 org/apache/commons/beanutils/converters/AbstractArrayConverter #80 = Utf8 useDefault #81 = Utf8 Z #82 = Utf8 (Ljava/lang/String;)V #83 = Utf8 java/lang/Object #84 = Utf8 getClass #85 = Utf8 ()Ljava/lang/Class; #86 = Utf8 strings #87 = Utf8 java/lang/Double #88 = Utf8 parseDouble #89 = Utf8 (Ljava/lang/String;)D #90 = Utf8 toString #91 = Utf8 ()Ljava/lang/String; #92 = Utf8 (Ljava/lang/String;Ljava/lang/Throwable;)V #93 = Utf8 parseElements #94 = Utf8 (Ljava/lang/String;)Ljava/util/List; #95 = Utf8 java/util/List #96 = Utf8 size #97 = Utf8 ()I #98 = Utf8 get #99 = Utf8 (I)Ljava/lang/Object;{ private static double[] model; descriptor: [D flags: ACC_PRIVATE, ACC_STATIC public ArrayConverter(); descriptor: ()V flags: ACC_PUBLIC Code: stack=2, locals=1, args_size=1 0: aload_0 1: invokespecial #1 // Method org/apache/commons/beanutils/converters/AbstractArrayConverter."":()V 4: aload_0 5: aconst_null 6: putfield #2 // Field defaultValue:Ljava/lang/Object; 9: aload_0 10: iconst_0 11: putfield #3 // Field useDefault:Z 14: return 14: return LineNumberTable: line 47: 0 line 49: 4 line 50: 9 line 52: 14 LocalVariableTable: Start Length Slot Name Signature 0 15 0 this Lorg/apache/commons/beanutils/converters/DoubleArrayConverter; public ArrayConverter(); descriptor: (Ljava/lang/Object;)V flags: ACC_PUBLIC Code: stack=2, locals=2, args_size=2 0: aload_0 1: invokespecial #1 // Method org/apache/commons/beanutils/converters/AbstractArrayConverter."":()V 4: aload_0 5: aload_1 6: putfield #4 // Field defaultValue:Ljava/lang/Object; 9: aload_0 10: iconst_1 11: putfield #5 // Field useDefault:Z 14: return LineNumberTable: line 61: 0 line 63: 4 line 64: 9 line 66: 14 LocalVariableTable: Start Length Slot Name Signature 0 15 0 this Lorg/apache/commons/beanutils/converters/DoubleArrayConverter; 0 15 1 defaultValue Ljava/lang/Object; public convert(, ); descriptor: (Ljava/lang/Class;Ljava/lang/Object;)Ljava/lang/Object; flags: ACC_PUBLIC Code: stack=4, locals=6, args_size=3 0: aload_2 1: ifnonnull 26 4: aload_0 5: getfield #6 // Field useDefault:Z 8: ifeq 16 11: aload_0 12: getfield #7 // Field defaultValue:Ljava/lang/Object; 15: areturn 16: new #8 // class org/apache/commons/beanutils/ConversionException 19: dup 20: ldc #9 // String No value specified 22: invokespecial #10 // Method org/apache/commons/beanutils/ConversionException."":(Ljava/lang/String;)V 25: athrow 26: getstatic #11 // Field model:[D 29: invokevirtual #12 // Method java/lang/ss:()Ljava/lang/Class; 32: aload_2 33: invokevirtual #12 // Method java/lang/ss:()Ljava/lang/Class; 36: if_acmpne 41 39: aload_2 40: areturn 41: getstatic #13 // Field org/apache/commons/beanutils/converters/s:[Ljava/lang/String; 44: invokevirtual #12 // Method java/lang/ss:()Ljava/lang/Class; 47: aload_2 48: invokevirtual #12 // Method java/lang/ss:()Ljava/lang/Class; 51: if_acmpne 122 54: aload_2 55: checkcast #14 // class "[Ljava/lang/String;" 58: astore_3 59: aload_3 60: arraylength 61: newarray double 63: astore 4 65: iconst_0 66: istore 5 68: goto 86 68: goto 86 71: aload 4 73: iload 5 75: aload_3 76: iload 5 78: aaload 79: invokestatic #15 // Method java/lang/ouble:(Ljava/lang/String;)D 82: dastore 83: iinc 5, 1 86: iload 5 88: aload_3 89: arraylength 90: if_icmplt 71 93: aload 4 95: areturn 96: astore_3 97: aload_0 98: getfield #17 // Field useDefault:Z 101: ifeq 109 104: aload_0 105: getfield #18 // Field defaultValue:Ljava/lang/Object; 108: areturn 109: new #8 // class org/apache/commons/beanutils/ConversionException 112: dup 113: aload_2 114: invokevirtual #19 // Method java/lang/ng:()Ljava/lang/String; 117: aload_3 118: invokespecial #20 // Method org/apache/commons/beanutils/ConversionException."":(Ljava/lang/String;Ljava/lang/Throwable;)V 121: athrow 122: aload_0 123: aload_2 124: invokevirtual #19 // Method java/lang/ng:()Ljava/lang/String; 127: invokevirtual #21 // Method parseElements:(Ljava/lang/String;)Ljava/util/List; 130: astore_3 131: aload_3 132: invokeinterface #22, 1 // InterfaceMethod java/util/:()I 137: newarray double 139: astore 4 141: iconst_0 142: istore 5 144: goto 169 147: aload 4 149: iload 5 151: aload_3 152: iload 5 154: invokeinterface #23, 2 // InterfaceMethod java/util/:(I)Ljava/lang/Object; 159: checkcast #24 // class java/lang/String 162: invokestatic #15 // Method java/lang/ouble:(Ljava/lang/String;)D 165: dastore 166: iinc 5, 1 169: iload 5 171: aload 4 173: arraylength 174: if_icmplt 147 177: aload 4 179: areturn 180: astore_3 181: aload_0 182: getfield #25 // Field useDefault:Z 185: ifeq 193 188: aload_0 189: getfield #26 // Field defaultValue:Ljava/lang/Object; 192: areturn 193: new #8 // class org/apache/commons/beanutils/ConversionException 196: dup 197: aload_2 198: invokevirtual #19 // Method java/lang/ng:()Ljava/lang/String; 201: aload_3 202: invokespecial #20 // Method org/apache/commons/beanutils/ConversionException."":(Ljava/lang/String;Ljava/lang/Throwable;)V 205: athrow Exception table: from to target type 54 95 96 Class java/lang/Exception 122 179 180 Class java/lang/Exception 122 179 180 Class java/lang/Exception LineNumberTable: line 94: 0 line 95: 4 line 96: 11 line 98: 16 line 103: 26 line 104: 39 line 108: 41 line 110: 54 line 111: 59 line 112: 65 line 113: 71 line 112: 83 line 115: 93 line 117: 96 line 118: 104 line 120: 109 line 128: 122 line 129: 131 line 130: 141 line 131: 147 line 130: 166 line 133: 177 line 135: 180 line 136: 188 line 138: 193 LocalVariableTable: Start Length Slot Name Signature 0 206 0 this Lorg/apache/commons/beanutils/converters/DoubleArrayConverter; 0 206 1 type Ljava/lang/Class; 0 206 2 value Ljava/lang/Object; 59 37 3 values [Ljava/lang/String; 65 31 4 results [D 68 28 5 i I 97 25 3 e Ljava/lang/Exception; 131 49 3 list Ljava/util/List; 141 39 4 results [D 144 36 5 i I 181 25 3 e Ljava/lang/Exception; static {}; descriptor: ()V flags: ACC_STATIC Code: stack=1, locals=0, args_size=0 0: iconst_0 1: newarray double 3: putstatic #11 // Field model:[D 6: return LineNumberTable: line 75: 0}SourceFile: ""