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public class: JSONWriter [javadoc | source]

Direct Known Subclasses:

JSONWriter provides a quick and convenient way of producing JSON text. The texts produced strictly conform to JSON syntax rules. No whitespace is added, so the results are ready for transmission or storage. Each instance of JSONWriter can produce one JSON text.

A JSONWriter instance provides a value method for appending values to the text, and a key method for adding keys before values in objects. There are array and endArray methods that make and bound array values, and object and endObject methods which make and bound object values. All of these methods return the JSONWriter instance, permitting a cascade style. For example,

new JSONWriter(myWriter)
        .value("Hello, World!")
which writes
{"JSON":"Hello, World!"}

The first method called must be array or object. There are no methods for adding commas or colons. JSONWriter adds them for you. Objects and arrays can be nested up to 20 levels deep.

This can sometimes be easier than using a JSONObject to build a string.

Field Summary
protected  char mode    The current mode. Values: 'a' (array), 'd' (done), 'i' (initial), 'k' (key), 'o' (object). 
protected  Writer writer    The writer that will receive the output. 
 public JSONWriter(Writer w) 
    Make a fresh JSONWriter. It can be used to build one JSON text.
Method from org.apache.tomcat.util.json.JSONWriter Summary:
array,   endArray,   endObject,   key,   object,   value,   value,   value,   value
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from org.apache.tomcat.util.json.JSONWriter Detail:
 public JSONWriter array() throws JSONException 
    Begin appending a new array. All values until the balancing endArray will be appended to this array. The endArray method must be called to mark the array's end.
 public JSONWriter endArray() throws JSONException 
    End an array. This method most be called to balance calls to array.
 public JSONWriter endObject() throws JSONException 
    End an object. This method most be called to balance calls to object.
 public JSONWriter key(String s) throws JSONException 
    Append a key. The key will be associated with the next value. In an object, every value must be preceded by a key.
 public JSONWriter object() throws JSONException 
    Begin appending a new object. All keys and values until the balancing endObject will be appended to this object. The endObject method must be called to mark the object's end.
 public JSONWriter value(boolean b) throws JSONException 
    Append either the value true or the value false.
 public JSONWriter value(double d) throws JSONException 
    Append a double value.
 public JSONWriter value(long l) throws JSONException 
    Append a long value.
 public JSONWriter value(Object o) throws JSONException 
    Append an object value.