public static final TypeAdapter<Class> CLASS = new TypeAdapter<Class>() {
@Override
public void write(JsonWriter out, Class value) throws IOException {
throw new UnsupportedOperationException("Attempted to serialize java.lang.Class: "
+ value.getName() + ". Forgot to register a type adapter?");
@Override
public Class read(JsonReader in) throws IOException {
throw new UnsupportedOperationException(
"Attempted to deserialize a java.lang.Class. Forgot to register a type adapter?");
}.nullSafe();
String类型，代码就是把字符串读出，写入
public static final TypeAdapter<StringBuilder> STRING_BUILDER = new TypeAdapter<StringBuilder>() {
@Override
public StringBuilder read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
return new StringBuilder(in.nextString());
@Override
public void write(JsonWriter out, StringBuilder value) throws IOException {
out.value(value == null ? null : value.toString());
URL数据，写入时，写的是String，读取时也是String，不过再加了转换
public static final TypeAdapter<URL> URL = new TypeAdapter<URL>() {
@Override
public URL read(JsonReader in) throws IOException {
if (in.peek() == JsonToken.NULL) {
in.nextNull();
return null;
String nextString = in.nextString();
return"null".equals(nextString) ? null : new URL(nextString);
@Override
public void write(JsonWriter out, URL value) throws IOException {
out.value(value == null ? null : value.toExternalForm());
