https://github.com/douglascrockford/JSON-java: JSON is a light-weight, language independent, data interchange format. See http://www.JSON.org/ The files in this package implement JSON encoders/decoders in Java. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL. This is a reference implementation. There is a large number of JSON packages in Java. Perhaps someday the Java community will standardize on one. Until then, choose carefully. The license includes this restriction: "The software shall be used for good, not evil." If your conscience cannot live with that, then choose a different package.
  • Douglas Crockford 
public class org.json.HTTP
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.json.HTTP
  super_class: java.lang.Object
{
  public static final java.lang.String CRLF;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "\r\n"

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.json.HTTP this
         0: .line 34
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.json.HTTP this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/json/HTTP;

  public static org.json.JSONObject toJSONObject(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/json/JSONObject;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=5, args_size=1
        start local 0 // java.lang.String string
         0: .line 72
            new org.json.JSONObject
            dup
            invokespecial org.json.JSONObject.<init>:()V
            astore 1 /* jo */
        start local 1 // org.json.JSONObject jo
         1: .line 73
            new org.json.HTTPTokener
            dup
            aload 0 /* string */
            invokespecial org.json.HTTPTokener.<init>:(Ljava/lang/String;)V
            astore 2 /* x */
        start local 2 // org.json.HTTPTokener x
         2: .line 76
            aload 2 /* x */
            invokevirtual org.json.HTTPTokener.nextToken:()Ljava/lang/String;
            astore 3 /* token */
        start local 3 // java.lang.String token
         3: .line 77
            aload 3 /* token */
            getstatic java.util.Locale.ROOT:Ljava/util/Locale;
            invokevirtual java.lang.String.toUpperCase:(Ljava/util/Locale;)Ljava/lang/String;
            ldc "HTTP"
            invokevirtual java.lang.String.startsWith:(Ljava/lang/String;)Z
            ifeq 9
         4: .line 81
            aload 1 /* jo */
            ldc "HTTP-Version"
            aload 3 /* token */
            invokevirtual org.json.JSONObject.put:(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;
            pop
         5: .line 82
            aload 1 /* jo */
            ldc "Status-Code"
            aload 2 /* x */
            invokevirtual org.json.HTTPTokener.nextToken:()Ljava/lang/String;
            invokevirtual org.json.JSONObject.put:(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;
            pop
         6: .line 83
            aload 1 /* jo */
            ldc "Reason-Phrase"
            aload 2 /* x */
            iconst_0
            invokevirtual org.json.HTTPTokener.nextTo:(C)Ljava/lang/String;
            invokevirtual org.json.JSONObject.put:(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;
            pop
         7: .line 84
            aload 2 /* x */
            invokevirtual org.json.HTTPTokener.next:()C
            pop
         8: .line 86
            goto 17
         9: .line 90
      StackMap locals: org.json.JSONObject org.json.HTTPTokener java.lang.String
      StackMap stack:
            aload 1 /* jo */
            ldc "Method"
            aload 3 /* token */
            invokevirtual org.json.JSONObject.put:(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;
            pop
        10: .line 91
            aload 1 /* jo */
            ldc "Request-URI"
            aload 2 /* x */
            invokevirtual org.json.HTTPTokener.nextToken:()Ljava/lang/String;
            invokevirtual org.json.JSONObject.put:(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;
            pop
        11: .line 92
            aload 1 /* jo */
            ldc "HTTP-Version"
            aload 2 /* x */
            invokevirtual org.json.HTTPTokener.nextToken:()Ljava/lang/String;
            invokevirtual org.json.JSONObject.put:(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;
            pop
        12: .line 97
            goto 17
        13: .line 98
      StackMap locals:
      StackMap stack:
            aload 2 /* x */
            bipush 58
            invokevirtual org.json.HTTPTokener.nextTo:(C)Ljava/lang/String;
            astore 4 /* name */
        start local 4 // java.lang.String name
        14: .line 99
            aload 2 /* x */
            bipush 58
            invokevirtual org.json.HTTPTokener.next:(C)C
            pop
        15: .line 100
            aload 1 /* jo */
            aload 4 /* name */
            aload 2 /* x */
            iconst_0
            invokevirtual org.json.HTTPTokener.nextTo:(C)Ljava/lang/String;
            invokevirtual org.json.JSONObject.put:(Ljava/lang/String;Ljava/lang/Object;)Lorg/json/JSONObject;
            pop
        16: .line 101
            aload 2 /* x */
            invokevirtual org.json.HTTPTokener.next:()C
            pop
        end local 4 // java.lang.String name
        17: .line 97
      StackMap locals:
      StackMap stack:
            aload 2 /* x */
            invokevirtual org.json.HTTPTokener.more:()Z
            ifne 13
        18: .line 103
            aload 1 /* jo */
            areturn
        end local 3 // java.lang.String token
        end local 2 // org.json.HTTPTokener x
        end local 1 // org.json.JSONObject jo
        end local 0 // java.lang.String string
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   19     0  string  Ljava/lang/String;
            1   19     1      jo  Lorg/json/JSONObject;
            2   19     2       x  Lorg/json/HTTPTokener;
            3   19     3   token  Ljava/lang/String;
           14   17     4    name  Ljava/lang/String;
    Exceptions:
      throws org.json.JSONException
    MethodParameters:
        Name  Flags
      string  

  public static java.lang.String toString(org.json.JSONObject);
    descriptor: (Lorg/json/JSONObject;)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=5, args_size=1
        start local 0 // org.json.JSONObject jo
         0: .line 128
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuilder sb
         1: .line 129
            aload 0 /* jo */
            ldc "Status-Code"
            invokevirtual org.json.JSONObject.has:(Ljava/lang/String;)Z
            ifeq 8
            aload 0 /* jo */
            ldc "Reason-Phrase"
            invokevirtual org.json.JSONObject.has:(Ljava/lang/String;)Z
            ifeq 8
         2: .line 130
            aload 1 /* sb */
            aload 0 /* jo */
            ldc "HTTP-Version"
            invokevirtual org.json.JSONObject.getString:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         3: .line 131
            aload 1 /* sb */
            bipush 32
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
         4: .line 132
            aload 1 /* sb */
            aload 0 /* jo */
            ldc "Status-Code"
            invokevirtual org.json.JSONObject.getString:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         5: .line 133
            aload 1 /* sb */
            bipush 32
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
         6: .line 134
            aload 1 /* sb */
            aload 0 /* jo */
            ldc "Reason-Phrase"
            invokevirtual org.json.JSONObject.getString:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         7: .line 135
            goto 18
      StackMap locals: java.lang.StringBuilder
      StackMap stack:
         8: aload 0 /* jo */
            ldc "Method"
            invokevirtual org.json.JSONObject.has:(Ljava/lang/String;)Z
            ifeq 17
            aload 0 /* jo */
            ldc "Request-URI"
            invokevirtual org.json.JSONObject.has:(Ljava/lang/String;)Z
            ifeq 17
         9: .line 136
            aload 1 /* sb */
            aload 0 /* jo */
            ldc "Method"
            invokevirtual org.json.JSONObject.getString:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        10: .line 137
            aload 1 /* sb */
            bipush 32
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
        11: .line 138
            aload 1 /* sb */
            bipush 34
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
        12: .line 139
            aload 1 /* sb */
            aload 0 /* jo */
            ldc "Request-URI"
            invokevirtual org.json.JSONObject.getString:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        13: .line 140
            aload 1 /* sb */
            bipush 34
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
        14: .line 141
            aload 1 /* sb */
            bipush 32
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
            pop
        15: .line 142
            aload 1 /* sb */
            aload 0 /* jo */
            ldc "HTTP-Version"
            invokevirtual org.json.JSONObject.getString:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        16: .line 143
            goto 18
        17: .line 144
      StackMap locals:
      StackMap stack:
            new org.json.JSONException
            dup
            ldc "Not enough material for an HTTP header."
            invokespecial org.json.JSONException.<init>:(Ljava/lang/String;)V
            athrow
        18: .line 146
      StackMap locals:
      StackMap stack:
            aload 1 /* sb */
            ldc "\r\n"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        19: .line 148
            aload 0 /* jo */
            invokevirtual org.json.JSONObject.keySet:()Ljava/util/Set;
            invokeinterface java.util.Set.iterator:()Ljava/util/Iterator;
            astore 3
            goto 29
      StackMap locals: org.json.JSONObject java.lang.StringBuilder top java.util.Iterator
      StackMap stack:
        20: aload 3
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast java.lang.String
            astore 2 /* key */
        start local 2 // java.lang.String key
        21: .line 149
            aload 0 /* jo */
            aload 2 /* key */
            invokevirtual org.json.JSONObject.optString:(Ljava/lang/String;)Ljava/lang/String;
            astore 4 /* value */
        start local 4 // java.lang.String value
        22: .line 150
            ldc "HTTP-Version"
            aload 2 /* key */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 29
            ldc "Status-Code"
            aload 2 /* key */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 29
        23: .line 151
            ldc "Reason-Phrase"
            aload 2 /* key */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 29
            ldc "Method"
            aload 2 /* key */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 29
        24: .line 152
            ldc "Request-URI"
            aload 2 /* key */
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 29
            getstatic org.json.JSONObject.NULL:Ljava/lang/Object;
            aload 4 /* value */
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifne 29
        25: .line 153
            aload 1 /* sb */
            aload 2 /* key */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        26: .line 154
            aload 1 /* sb */
            ldc ": "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        27: .line 155
            aload 1 /* sb */
            aload 0 /* jo */
            aload 2 /* key */
            invokevirtual org.json.JSONObject.optString:(Ljava/lang/String;)Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        28: .line 156
            aload 1 /* sb */
            ldc "\r\n"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        end local 4 // java.lang.String value
        end local 2 // java.lang.String key
        29: .line 148
      StackMap locals:
      StackMap stack:
            aload 3
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 20
        30: .line 159
            aload 1 /* sb */
            ldc "\r\n"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        31: .line 160
            aload 1 /* sb */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 1 // java.lang.StringBuilder sb
        end local 0 // org.json.JSONObject jo
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0   32     0     jo  Lorg/json/JSONObject;
            1   32     1     sb  Ljava/lang/StringBuilder;
           21   29     2    key  Ljava/lang/String;
           22   29     4  value  Ljava/lang/String;
    Exceptions:
      throws org.json.JSONException
    MethodParameters:
      Name  Flags
      jo    
}
SourceFile: "HTTP.java"