下面列出了com.alibaba.fastjson.serializer.SerializeWriter#writeNull ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* 写值
*
* @param out 输出
* @param field 字段
* @param value 值
* @param ignoreNull 是否忽略null值
* @param separator 分隔符位置
*/
protected void writeString(final SerializeWriter out, final String field, final String value,
final boolean ignoreNull, final int separator) {
if (value != null || !ignoreNull) {
if (separator == BEFORE) {
out.write(',');
}
out.writeFieldName(field);
if (value == null) {
out.writeNull();
} else {
out.writeString(value);
}
if (separator == AFTER) {
out.write(',');
}
}
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
SerializeWriter out = serializer.out;
if (object == null) {
out.writeNull();
return;
}
Record record = (Record) object;
Entity entity = record.getEntity();
JSONObject map = new JSONObject();
for (Iterator<String> iter = record.getAvailableFieldIterator(); iter.hasNext(); ) {
String field = iter.next();
Object value = record.getObjectValue(field);
value = FieldValueWrapper.instance.wrapFieldValue(value, entity.getField(field), false);
map.put(field, value);
}
out.write(map.toJSONString());
}
@Override
public void writeValue(JSONSerializer serializer, Object propertyValue) throws Exception {
SerializeWriter out = serializer.getWriter();
Object value = propertyValue;
if (value == null) {
if (out.isEnabled(SerializerFeature.WriteNullNumberAsZero)) {
out.write('0');
} else {
out.writeNull();
}
return;
}
out.append(value.toString());
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features)
throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
Tree<?> tree = (Tree<?>) object;
if (tree.isCheckable()) {
visitCheck(tree.getRoots(), tree.getChecked());
}
if (!Strings.isNullOrEmpty(tree.getIconProperty())) {
visitIcon(tree.getRoots(), tree.getIconProperty());
}
if (tree.isExpandAll()) {
expandAll(tree.getRoots());
}
serializer.write(tree.getRoots());
}
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
Class cls = object.getClass();
if (cls == DateTime.class) {
out.writeString(dateTimeCodec().toString((DateTime) object));
return;
} else if (cls == LocalDateTime.class) {
out.writeString(localDateTimeCodec().toString((LocalDateTime) object));
return;
} else if (cls == LocalDate.class) {
out.writeString(localDateCodec().toString((LocalDate) object));
return;
} else if (cls == LocalTime.class) {
out.writeString(localTimeCodec().toString((LocalTime) object));
return;
}
out.writeString(object.toString());
}
@Override
public void write(
JSONSerializer serializer,
Object object,
Object fieldName,
Type fieldType,
int features
) {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
} else {
Class cls = object.getClass();
if (cls == DateTime.class) {
out.writeString(object.toString());
} else {
out.writeString(object.toString());
}
}
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features)
throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
Page<?> page = (Page<?>) object;
out.write('{');
out.writeFieldName(DEFAULT_CURRENT_FIELD);
out.writeInt(page.getNumber());
out.write(',');
out.writeFieldName(DEFAULT_ROWCOUNT_FIELD);
out.writeInt(page.getSize());
out.write(',');
out.writeFieldName(DEFAULT_TOTAL_FIELD);
out.writeLong(page.getTotalElements());
out.write(',');
out.writeFieldName(DEFAULT_ROWS_FIELD);
serializer.write(page.getContent());
out.write('}');
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features)
throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
DateTime dateTime = (DateTime) object;
serializer.write(dateTime.toDate());
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
ValueObject vo = (ValueObject) object;
out.write(vo.toJSONString());
}
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
out.writeString(keywordCodec.toString((Keyword) object));
}
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
if (out.isEnabled(SerializerFeature.WriteNullListAsEmpty)) {
out.write("[]");
}
else {
out.writeNull();
}
return;
}
Type elementType = null;
if (serializer.isEnabled(SerializerFeature.WriteClassName)) {
if (fieldType instanceof ParameterizedType) {
ParameterizedType param = (ParameterizedType) fieldType;
elementType = param.getActualTypeArguments()[0];
}
}
Collection<?> collection = (Collection<?>) object;
SerialContext context = serializer.getContext();
serializer.setContext(context, object, fieldName, 0);
if (serializer.isEnabled(SerializerFeature.WriteClassName)) {
if (HashSet.class == collection.getClass()) {
out.append("Set");
}
else if (TreeSet.class == collection.getClass()) {
out.append("TreeSet");
}
}
try {
int i = 0;
out.append('[');
for (Object item : collection) {
if (i++ != 0) {
out.append(',');
}
if (item == null) {
out.writeNull();
continue;
}
Class<?> clazz = item.getClass();
if (clazz == Integer.class) {
out.writeInt(((Integer) item).intValue());
continue;
}
if (clazz == Long.class) {
out.writeLong(((Long) item).longValue());
if (out.isEnabled(SerializerFeature.WriteClassName)) {
out.write('L');
}
continue;
}
ObjectSerializer itemSerializer = serializer.getObjectWriter(clazz);
itemSerializer.write(serializer, item, i - 1, elementType, 0);
}
out.append(']');
}
finally {
serializer.setContext(context);
}
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features)
throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
Node<?> node = (Node<?>) object;
out.write('{');
out.writeFieldName("children");
serializer.write(node.getChildren());
out.write(",");
out.writeFieldName("leaf");
out.write(node.getLeaf());
out.write(",");
if (!Strings.isNullOrEmpty(node.getIcon())) {
out.writeFieldName("icon");
out.writeString(node.getIcon());
out.write(",");
}
if (node.getChecked() != null) {
out.writeFieldName("checked");
out.write(node.getChecked());
out.write(",");
}
if (node.getExpanded() != null) {
out.writeFieldName("expanded");
out.write(node.getExpanded());
out.write(",");
}
List<? extends SerializeFilter> serializeFilters = serializer.getPropertyPreFilters();
Object data = node.getData();
// 处理父节点
if (data != null && data instanceof Treeable && serializeFilters != null && serializeFilters.size() > 0) {
boolean parentProcess = false;
for (SerializeFilter filter : serializeFilters) {
if (filter instanceof IncludesPropertyPreFilter) {
Set<String> includes = ((IncludesPropertyPreFilter) filter).getIncludes();
parentProcess = includes.contains("parent");
if (parentProcess) {
break;
}
}
}
if (parentProcess) {
Object parent = ((Treeable<?>) data).getParent();
if (parent != null) {
out.writeFieldName("parent");
out.write(JSON.toJSONString(parent, serializeConfig,
Iterables.toArray(serializeFilters, SerializeFilter.class)));
out.write(",");
}
}
}
// 处理对象值
String dataString = serializeFilters == null ? JSON.toJSONString(data, serializeConfig)
: JSON.toJSONString(data, serializeConfig, Iterables.toArray(serializeFilters, SerializeFilter.class));
dataString = StringUtils.substring(dataString, 1);
out.write(dataString);
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features)
throws IOException {
SerializeWriter out = serializer.getWriter();
if (object == null) {
out.writeNull();
return;
}
Result result = (Result) object;
out.write('{');
Map<String, Object> extraProperties = result.getExtraProperties();
for (Entry<String, Object> entry : extraProperties.entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
out.writeFieldName(key);
serializer.write(value);
out.write(',');
}
out.writeFieldName(FIELD_SUCCESS);
out.write(Objects.equal(result.getCode(), Code.success));
out.write(',');
out.writeFieldName(FIELD_CODE);
out.writeString(result.getCode().name());
out.write(',');
out.writeFieldName(FIELD_MESSAGE);
out.writeString(result.getMessage());
out.write(',');
out.writeFieldName(FIELD_DATA);
serializer.write(result.getData());
out.write('}');
}