下面列出了java.io.ObjectStreamClass#getFields ( ) 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。
public static void main(String[] args) throws Exception {
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream(byteOutput);
output.writeObject(new TestClass());
ByteArrayInputStream bais = new ByteArrayInputStream(byteOutput.toByteArray());
TestObjectInputStream input = new TestObjectInputStream(bais);
input.readObject();
ObjectStreamClass osc = input.getDescriptor();
// All OSC public API methods should complete without throwing.
osc.getName();
osc.forClass();
osc.getField("str");
osc.getFields();
osc.getSerialVersionUID();
osc.toString();
}
/**
* Get the names and types of all the persistent fields of a Class.
*/
private Hashtable getPersistentFields (Class clz) {
Hashtable result = new Hashtable();
ObjectStreamClass osc = ObjectStreamClass.lookup(clz);
if (osc != null) {
ObjectStreamField[] fields = osc.getFields();
for (int i = 0; i < fields.length; i++) {
String typeSig;
String typePrefix = String.valueOf(fields[i].getTypeCode());
if (fields[i].isPrimitive()) {
typeSig = typePrefix;
} else {
if (fields[i].getTypeCode() == '[') {
typePrefix = "";
}
typeSig = typePrefix + fields[i].getType().getName().replace('.','/');
if (typeSig.endsWith(";")) {
typeSig = typeSig.substring(0,typeSig.length()-1);
}
}
result.put(fields[i].getName(),typeSig);
}
}
return result;
}
public static void main(String[] args) throws Exception {
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream(byteOutput);
output.writeObject(new TestClass());
ByteArrayInputStream bais = new ByteArrayInputStream(byteOutput.toByteArray());
TestObjectInputStream input = new TestObjectInputStream(bais);
input.readObject();
ObjectStreamClass osc = input.getDescriptor();
// All OSC public API methods should complete without throwing.
osc.getName();
osc.forClass();
osc.getField("str");
osc.getFields();
osc.getSerialVersionUID();
osc.toString();
}
/**
* Get the names and types of all the persistent fields of a Class.
*/
private Hashtable getPersistentFields (Class clz) {
Hashtable result = new Hashtable();
ObjectStreamClass osc = ObjectStreamClass.lookup(clz);
if (osc != null) {
ObjectStreamField[] fields = osc.getFields();
for (int i = 0; i < fields.length; i++) {
String typeSig;
String typePrefix = String.valueOf(fields[i].getTypeCode());
if (fields[i].isPrimitive()) {
typeSig = typePrefix;
} else {
if (fields[i].getTypeCode() == '[') {
typePrefix = "";
}
typeSig = typePrefix + fields[i].getType().getName().replace('.','/');
if (typeSig.endsWith(";")) {
typeSig = typeSig.substring(0,typeSig.length()-1);
}
}
result.put(fields[i].getName(),typeSig);
}
}
return result;
}
/**
* Get the names and types of all the persistent fields of a Class.
*/
private Hashtable getPersistentFields (Class clz) {
Hashtable result = new Hashtable();
ObjectStreamClass osc = ObjectStreamClass.lookup(clz);
if (osc != null) {
ObjectStreamField[] fields = osc.getFields();
for (int i = 0; i < fields.length; i++) {
String typeSig;
String typePrefix = String.valueOf(fields[i].getTypeCode());
if (fields[i].isPrimitive()) {
typeSig = typePrefix;
} else {
if (fields[i].getTypeCode() == '[') {
typePrefix = "";
}
typeSig = typePrefix + fields[i].getType().getName().replace('.','/');
if (typeSig.endsWith(";")) {
typeSig = typeSig.substring(0,typeSig.length()-1);
}
}
result.put(fields[i].getName(),typeSig);
}
}
return result;
}
public static void main(String[] args) throws Exception {
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream(byteOutput);
output.writeObject(new TestClass());
ByteArrayInputStream bais = new ByteArrayInputStream(byteOutput.toByteArray());
TestObjectInputStream input = new TestObjectInputStream(bais);
input.readObject();
ObjectStreamClass osc = input.getDescriptor();
// All OSC public API methods should complete without throwing.
osc.getName();
osc.forClass();
osc.getField("str");
osc.getFields();
osc.getSerialVersionUID();
osc.toString();
}
public void test_specialTypes() {
Class<?> proxyClass = Proxy.getProxyClass(this.getClass()
.getClassLoader(), new Class[] { Runnable.class });
ObjectStreamClass proxyStreamClass = ObjectStreamClass
.lookup(proxyClass);
assertEquals("Proxy classes should have zero serialVersionUID", 0,
proxyStreamClass.getSerialVersionUID());
ObjectStreamField[] proxyFields = proxyStreamClass.getFields();
assertEquals("Proxy classes should have no serialized fields", 0,
proxyFields.length);
ObjectStreamClass enumStreamClass = ObjectStreamClass
.lookup(Thread.State.class);
assertEquals("Enum classes should have zero serialVersionUID", 0,
enumStreamClass.getSerialVersionUID());
ObjectStreamField[] enumFields = enumStreamClass.getFields();
assertEquals("Enum classes should have no serialized fields", 0,
enumFields.length);
}
public static void main(String[] args) throws Exception {
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream(byteOutput);
output.writeObject(new TestClass());
ByteArrayInputStream bais = new ByteArrayInputStream(byteOutput.toByteArray());
TestObjectInputStream input = new TestObjectInputStream(bais);
input.readObject();
ObjectStreamClass osc = input.getDescriptor();
// All OSC public API methods should complete without throwing.
osc.getName();
osc.forClass();
osc.getField("str");
osc.getFields();
osc.getSerialVersionUID();
osc.toString();
}
/**
* Get the names and types of all the persistent fields of a Class.
*/
private Hashtable getPersistentFields (Class clz) {
Hashtable result = new Hashtable();
ObjectStreamClass osc = ObjectStreamClass.lookup(clz);
if (osc != null) {
ObjectStreamField[] fields = osc.getFields();
for (int i = 0; i < fields.length; i++) {
String typeSig;
String typePrefix = String.valueOf(fields[i].getTypeCode());
if (fields[i].isPrimitive()) {
typeSig = typePrefix;
} else {
if (fields[i].getTypeCode() == '[') {
typePrefix = "";
}
typeSig = typePrefix + fields[i].getType().getName().replace('.','/');
if (typeSig.endsWith(";")) {
typeSig = typeSig.substring(0,typeSig.length()-1);
}
}
result.put(fields[i].getName(),typeSig);
}
}
return result;
}
public static void main(String[] args) throws Exception {
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream(byteOutput);
output.writeObject(new TestClass());
ByteArrayInputStream bais = new ByteArrayInputStream(byteOutput.toByteArray());
TestObjectInputStream input = new TestObjectInputStream(bais);
input.readObject();
ObjectStreamClass osc = input.getDescriptor();
// All OSC public API methods should complete without throwing.
osc.getName();
osc.forClass();
osc.getField("str");
osc.getFields();
osc.getSerialVersionUID();
osc.toString();
}
public static void main(String[] args) throws Exception {
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream(byteOutput);
output.writeObject(new TestClass());
ByteArrayInputStream bais = new ByteArrayInputStream(byteOutput.toByteArray());
TestObjectInputStream input = new TestObjectInputStream(bais);
input.readObject();
ObjectStreamClass osc = input.getDescriptor();
// All OSC public API methods should complete without throwing.
osc.getName();
osc.forClass();
osc.getField("str");
osc.getFields();
osc.getSerialVersionUID();
osc.toString();
}
/**
* Get the names and types of all the persistent fields of a Class.
*/
private Hashtable getPersistentFields (Class clz) {
Hashtable result = new Hashtable();
ObjectStreamClass osc = ObjectStreamClass.lookup(clz);
if (osc != null) {
ObjectStreamField[] fields = osc.getFields();
for (int i = 0; i < fields.length; i++) {
String typeSig;
String typePrefix = String.valueOf(fields[i].getTypeCode());
if (fields[i].isPrimitive()) {
typeSig = typePrefix;
} else {
if (fields[i].getTypeCode() == '[') {
typePrefix = "";
}
typeSig = typePrefix + fields[i].getType().getName().replace('.','/');
if (typeSig.endsWith(";")) {
typeSig = typeSig.substring(0,typeSig.length()-1);
}
}
result.put(fields[i].getName(),typeSig);
}
}
return result;
}
public static void main(String[] args) throws Exception {
ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream(byteOutput);
output.writeObject(new TestClass());
ByteArrayInputStream bais = new ByteArrayInputStream(byteOutput.toByteArray());
TestObjectInputStream input = new TestObjectInputStream(bais);
input.readObject();
ObjectStreamClass osc = input.getDescriptor();
// All OSC public API methods should complete without throwing.
osc.getName();
osc.forClass();
osc.getField("str");
osc.getFields();
osc.getSerialVersionUID();
osc.toString();
}
/**
* Get the names and types of all the persistent fields of a Class.
*/
private Hashtable getPersistentFields (Class clz) {
Hashtable result = new Hashtable();
ObjectStreamClass osc = ObjectStreamClass.lookup(clz);
if (osc != null) {
ObjectStreamField[] fields = osc.getFields();
for (int i = 0; i < fields.length; i++) {
String typeSig;
String typePrefix = String.valueOf(fields[i].getTypeCode());
if (fields[i].isPrimitive()) {
typeSig = typePrefix;
} else {
if (fields[i].getTypeCode() == '[') {
typePrefix = "";
}
typeSig = typePrefix + fields[i].getType().getName().replace('.','/');
if (typeSig.endsWith(";")) {
typeSig = typeSig.substring(0,typeSig.length()-1);
}
}
result.put(fields[i].getName(),typeSig);
}
}
return result;
}
/**
* Get the names and types of all the persistent fields of a Class.
*/
private Hashtable getPersistentFields (Class clz) {
Hashtable result = new Hashtable();
ObjectStreamClass osc = ObjectStreamClass.lookup(clz);
if (osc != null) {
ObjectStreamField[] fields = osc.getFields();
for (int i = 0; i < fields.length; i++) {
String typeSig;
String typePrefix = String.valueOf(fields[i].getTypeCode());
if (fields[i].isPrimitive()) {
typeSig = typePrefix;
} else {
if (fields[i].getTypeCode() == '[') {
typePrefix = "";
}
typeSig = typePrefix + fields[i].getType().getName().replace('.','/');
if (typeSig.endsWith(";")) {
typeSig = typeSig.substring(0,typeSig.length()-1);
}
}
result.put(fields[i].getName(),typeSig);
}
}
return result;
}
private static void printInfo(ObjectStreamClass osc) {
System.out.println(osc.forClass());
System.out.println("Class name: " + osc.getName());
System.out.println("SerialVersionUID: " + osc.getSerialVersionUID());
ObjectStreamField[] fields = osc.getFields();
System.out.println("Serialized fields:");
for (ObjectStreamField osf : fields) {
System.out.println(osf.getName() + ": ");
System.out.println("\t" + osf.getType());
System.out.println("\t" + osf.getTypeCode());
System.out.println("\t" + osf.getTypeString());
System.out.println("\t" + osf.getOffset());
}
}
public void testSerializeFieldMadeTransient() throws Exception {
// Does ObjectStreamClass have the right idea?
ObjectStreamClass osc = ObjectStreamClass.lookup(FieldMadeTransient.class);
ObjectStreamField[] fields = osc.getFields();
assertEquals(1, fields.length);
assertEquals("nonTransientInt", fields[0].getName());
assertEquals(int.class, fields[0].getType());
// this was created by serializing a FieldMadeTransient with a non-0 transientInt
String s = "aced0005737200346c6962636f72652e6a6176612e696f2e53657269616c697a6174696f6e54657"
+ "374244669656c644d6164655472616e7369656e74000000000000000002000149000c7472616e736"
+ "9656e74496e747870abababab";
FieldMadeTransient deserialized = (FieldMadeTransient) SerializationTester.deserializeHex(s);
assertEquals(0, deserialized.transientInt);
}
private static boolean equals(ObjectStreamClass osc1, ObjectStreamClass osc2) {
if (osc1 == osc2) {
return true;
} else if (osc1.getName().equals(osc2.getName()) && osc1.getSerialVersionUID() == osc2.getSerialVersionUID() && osc1.getFields().length == osc2.getFields().length) {
try {
return Arrays.equals(getSerializedForm(osc1), getSerializedForm(osc2));
} catch (IOException e) {
throw new AssertionError(e);
}
} else {
return false;
}
}
private static boolean equals(ObjectStreamClass osc1, ObjectStreamClass osc2) {
if (osc1 == osc2) {
return true;
} else if (osc1.getName().equals(osc2.getName()) && osc1.getSerialVersionUID() == osc2.getSerialVersionUID() && osc1.getFields().length == osc2.getFields().length) {
try {
return Arrays.equals(getSerializedForm(osc1), getSerializedForm(osc2));
} catch (IOException e) {
throw new AssertionError(e);
}
} else {
return false;
}
}
/**
* java.io.ObjectStreamClass#getFields()
*/
public void test_getFields() {
ObjectStreamClass osc = ObjectStreamClass.lookup(DummyClass.class);
ObjectStreamField[] osfArray = osc.getFields();
assertTrue(
"Array of fields should be of length 2 but is instead of length: "
+ osfArray.length, osfArray.length == 2);
}