java.lang.reflect.Field#setByte ( )源码实例Demo

/**
 * 设置指定类的field值
 *
 * @param clazz 类
 * @param field field
 * @param value 值
 * @throws IllegalArgumentException
 * @throws IllegalAccessException
 */
public static void setField(Class<?> clazz, Field field, Object value)
        throws IllegalArgumentException, IllegalAccessException {
    Class<?> fieldType = field.getType();
    if (int.class.equals(fieldType)) {
        field.setInt(clazz, Integer.parseInt(String.valueOf(value)));
    } else if (boolean.class.equals(fieldType)) {
        field.setBoolean(clazz, Boolean.parseBoolean(String.valueOf(value)));
    } else if (byte.class.equals(fieldType)) {
        field.setByte(clazz, Byte.parseByte(String.valueOf(value)));
    } else if (double.class.equals(fieldType)) {
        field.setDouble(clazz, Double.parseDouble(String.valueOf(value)));
    } else if (float.class.equals(fieldType)) {
        field.setFloat(clazz, Float.parseFloat(String.valueOf(value)));
    } else if (long.class.equals(fieldType)) {
        field.setLong(clazz, Long.parseLong(String.valueOf(value)));
    } else if (short.class.equals(fieldType)) {
        field.setShort(clazz, Short.parseShort(String.valueOf(value)));
    } else if (char.class.equals(fieldType) && value instanceof Character) {
        field.setChar(clazz, (Character) value);
    } else {
        field.set(clazz, value);
    }
}
 

public Object removeIgnored(Object value) {
  Object newValue = value;
  if (ignore != null && ignore.length > 0) {
    newValue = shallowCopy(value);
    for (String each : ignore) {
      try {
        Field field = this.argumentClass.getDeclaredField(each);
        field.setAccessible(true);
        if (field.getType().isPrimitive()) {
          field.setByte(newValue, Integer.valueOf(0).byteValue());
        } else {
          field.set(newValue, null);
        }
      } catch (IllegalAccessException | NoSuchFieldException e) {
        throw new SnapshotMatchException("Invalid Ignore value " + each, e.getCause());
      }
    }
  }
  return newValue;
}
 

void setVal(Field f, int i) {
    try {
        if (f.getType() == int.class) {
            f.setInt(this, i);
            return;
        } else if (f.getType() == short.class) {
            f.setShort(this, (short)i);
            return;
        } else if (f.getType() == byte.class) {
            f.setByte(this, (byte)i);
            return;
        } else if (f.getType() == long.class) {
            f.setLong(this, i);
            return;
        }
    } catch(IllegalAccessException iae) {
        throw new RuntimeException("Getting fields failed");
    }
    throw new RuntimeException("unexpected field type");
}
 

public static void setNumber(Object o, Field field, long n) throws IllegalAccessException {
    field.setAccessible(true);
    Class claxx = field.getType();
    if (claxx == long.class) {
        field.setLong(o, n);
    } else if (claxx == int.class) {
        field.setInt(o, (int) n);
    } else if (claxx == short.class) {
        field.setShort(o, (short) n);
    } else if (claxx == byte.class) {
        field.setByte(o, (byte) n);
    } else if (claxx == Long.class) {
        field.set(o, new Long(n));
    } else if (claxx == Integer.class) {
        field.set(o, new Integer((int) n));
    } else if (claxx == Short.class) {
        field.set(o, new Short((short) n));
    } else if (claxx == Byte.class) {
        field.set(o, new Byte((byte) n));
    } else {
        throw new RuntimeException("field is not a number class");
    }
}
 

@Override
public void handle(VM vm, Object[] operands) throws Exception {
    String ownerName = (String) operands[0];
    String name = (String) operands[1];
    String typeName = (String) operands[2];

    Class clazz = VM.getClazz(ownerName);
    Class type = VM.getClazz(typeName);
    Field field = VM.getField(clazz, name, type);

    if (field == null)
        throw new VMException();

    JWrapper value = vm.pop();

    if (value instanceof JTop)
        value = vm.pop();

    if ("int".equals(ownerName))
        field.setInt(null, value.asInt());
    else if ("long".equals(ownerName))
        field.setLong(null, value.asLong());
    else if ("float".equals(ownerName))
        field.setFloat(null, value.asFloat());
    else if ("double".equals(ownerName))
        field.setDouble(null, value.asDouble());
    else if ("byte".equals(ownerName))
        field.setByte(null, value.asByte());
    else if ("short".equals(ownerName))
        field.setShort(null, value.asShort());
    else if ("char".equals(ownerName))
        field.setChar(null, value.asChar());
    else if ("boolean".equals(ownerName))
        field.setBoolean(null, value.asBool());
    else
        field.set(null, value.asObj());
}
 

@Override
public void handle(VM vm, Object[] operands) throws Exception {
    String ownerName = (String) operands[0];
    String name = (String) operands[1];
    String typeName = (String) operands[2];

    Class clazz = VM.getClazz(ownerName);
    Class type = VM.getClazz(typeName);
    Field field = VM.getField(clazz, name, type);

    if (field == null)
        throw new VMException();

    JWrapper value = vm.pop();

    if (value instanceof JTop)
        value = vm.pop();

    Object ref = vm.pop().asObj();

    if ("int".equals(ownerName))
        field.setInt(ref, value.asInt());
    else if ("long".equals(ownerName))
        field.setLong(ref, value.asLong());
    else if ("float".equals(ownerName))
        field.setFloat(ref, value.asFloat());
    else if ("double".equals(ownerName))
        field.setDouble(ref, value.asDouble());
    else if ("byte".equals(ownerName))
        field.setByte(ref, value.asByte());
    else if ("short".equals(ownerName))
        field.setShort(ref, value.asShort());
    else if ("char".equals(ownerName))
        field.setChar(ref, value.asChar());
    else if ("boolean".equals(ownerName))
        field.setBoolean(ref, value.asBool());
    else
        field.set(ref, value.asObj());
}
 

/**
 * Sets a field from a string. It only supports fields where {@link
 * ConfigCommandUtils#isSupportedType(Class)} for {@link Field#getType()}
 *
 * @param string The string to set the field's value to
 * @param field  The field to set
 * @param object The object upon which to set the field
 */
public static void setFieldFromString(String string, Field field, @Nullable Object object) {
    if (!isSupportedType(field.getType())) {
        throw new IllegalArgumentException("Unsupported field type");
    }
    try {
        if (field.getType() == int.class) {
            field.setInt(object, Integer.parseInt(string));
        } else if (field.getType() == double.class) {
            field.setDouble(object, Double.parseDouble(string));
        } else if (field.getType() == float.class) {
            field.setFloat(object, Float.parseFloat(string));
        } else if (field.getType() == boolean.class) {
            field.setBoolean(object, Boolean.parseBoolean(string));
        } else if (field.getType() == byte.class) {
            field.setByte(object, Byte.parseByte(string));
        } else if (field.getType() == long.class) {
            field.setLong(object, Long.parseLong(string));
        } else if (field.getType() == short.class) {
            field.setShort(object, Short.parseShort(string));
        } else if (field.getType() == char.class) {
            field.setChar(object, string.charAt(0));
        } else if (field.getType() == String.class) {
            field.set(object, string);
        }
    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}
 

private static void readValue(Parcel source, Field field, Object target) {
    try {
        if (!checkSerializable(field)) {
            return;
        }
        field.setAccessible(true);
        if (field.getType().equals(int.class)) {
            field.setInt(target, source.readInt());
        } else if (field.getType().equals(double.class)) {
            field.setDouble(target, source.readDouble());
        } else if (field.getType().equals(float.class)) {
            field.setFloat(target, source.readFloat());
        } else if (field.getType().equals(long.class)) {
            field.setLong(target, source.readLong());
        } else if (field.getType().equals(boolean.class)) {
            field.setBoolean(target, source.readInt() != 0);
        } else if (field.getType().equals(char.class)) {
            field.setChar(target, (char) source.readInt());
        } else if (field.getType().equals(byte.class)) {
            field.setByte(target, source.readByte());
        } else if (field.getType().equals(short.class)) {
            field.setShort(target, (short) source.readInt());
        } else {
            field.set(target,
                    source.readValue(target.getClass().getClassLoader()));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}
 

@SuppressWarnings({ "unchecked", "rawtypes" })
private static void setField(Object obj, Field field, String value) throws IllegalArgumentException,
        IllegalAccessException {
    Class<?> type = field.getType();
    if (type.equals(Boolean.TYPE)) {
        field.setBoolean(obj, Boolean.parseBoolean(value));
    } else if (type.equals(Byte.TYPE)) {
        field.setByte(obj, Byte.parseByte(value));
    } else if (type.equals(Character.TYPE)) {
        field.setChar(obj, parseChar(value));
    } else if (type.equals(Double.TYPE)) {
        field.setDouble(obj, Double.parseDouble(value));
    } else if (type.equals(Float.TYPE)) {
        field.setFloat(obj, Float.parseFloat(value));
    } else if (type.equals(Integer.TYPE)) {
        field.setInt(obj, safeStrToInt(value));
    } else if (type.equals(Long.TYPE)) {
        field.setLong(obj, Long.parseLong(value));
    } else if (type.equals(Short.TYPE)) {
        field.setShort(obj, Short.parseShort(value));
    } else if (type.isEnum()) {
        field.set(obj, Enum.valueOf((Class<Enum>) field.getType(), value));
    } else if (type.equals(String.class)) {
        field.set(obj, value);
    } else if (type.equals(File.class)) {
        field.set(obj, new File(value));
    } else if (type.equals(Date.class)) {
        DateFormat df = new SimpleDateFormat("MM-dd-yy.hh:mma");
        try {
            field.set(obj, df.parse(value));
        } catch (java.text.ParseException e) {
            throw new RuntimeException(e);
        }
    } else {
        throw new RuntimeException("Field type not supported: " + type.getName());
    }
}
 

private void getCellValue(Cell cell, Object o, Field field) throws IllegalAccessException, ParseException {
    LOG.debug("cell:{}, field:{}, type:{}", cell.getCellTypeEnum(), field.getName(), field.getType().getName());
    switch (cell.getCellTypeEnum()) {
        case BLANK:
            break;
        case BOOLEAN:
            field.setBoolean(o, cell.getBooleanCellValue());
            break;
        case ERROR:
            field.setByte(o, cell.getErrorCellValue());
            break;
        case FORMULA:
            field.set(o, cell.getCellFormula());
            break;
        case NUMERIC:
            if (DateUtil.isCellDateFormatted(cell)) {
                if (field.getType().getName().equals(Date.class.getName())) {
                    field.set(o, cell.getDateCellValue());
                } else {
                    field.set(o, format.format(cell.getDateCellValue()));
                }
            } else {
                if (field.getType().isAssignableFrom(Integer.class) || field.getType().getName().equals("int")) {
                    field.setInt(o, (int) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Short.class) || field.getType().getName().equals("short")) {
                    field.setShort(o, (short) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Float.class) || field.getType().getName().equals("float")) {
                    field.setFloat(o, (float) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Byte.class) || field.getType().getName().equals("byte")) {
                    field.setByte(o, (byte) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Double.class) || field.getType().getName().equals("double")) {
                    field.setDouble(o, cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(String.class)) {
                    String s = String.valueOf(cell.getNumericCellValue());
                    if (s.contains("E")) {
                        s = s.trim();
                        BigDecimal bigDecimal = new BigDecimal(s);
                        s = bigDecimal.toPlainString();
                    }
                    //防止整数判定为浮点数
                    if (s.endsWith(".0")) { s = s.substring(0, s.indexOf(".0")); }
                    field.set(o, s);
                } else {
                    field.set(o, cell.getNumericCellValue());
                }
            }
            break;
        case STRING:
            if (field.getType().getName().equals(Date.class.getName())) {
                field.set(o, format.parse(cell.getRichStringCellValue().getString()));
            } else {
                field.set(o, cell.getRichStringCellValue().getString());
            }
            break;
        default:
            field.set(o, cell.getStringCellValue());
            break;
    }
}
 

private void getCellValue(Cell cell, Object o, Field field) throws IllegalAccessException, ParseException {
    LOG.debug("cell:{}, field:{}, type:{}", cell.getCellTypeEnum(), field.getName(), field.getType().getName());
    switch (cell.getCellTypeEnum()) {
        case BLANK:
            break;
        case BOOLEAN:
            field.setBoolean(o, cell.getBooleanCellValue());
            break;
        case ERROR:
            field.setByte(o, cell.getErrorCellValue());
            break;
        case FORMULA:
            field.set(o, cell.getCellFormula());
            break;
        case NUMERIC:
            if (DateUtil.isCellDateFormatted(cell)) {
                if (field.getType().getName().equals(Date.class.getName())) {
                    field.set(o, cell.getDateCellValue());
                } else {
                    field.set(o, format.format(cell.getDateCellValue()));
                }
            } else {
                if (field.getType().isAssignableFrom(Integer.class) || field.getType().getName().equals("int")) {
                    field.setInt(o, (int) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Short.class) || field.getType().getName().equals("short")) {
                    field.setShort(o, (short) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Float.class) || field.getType().getName().equals("float")) {
                    field.setFloat(o, (float) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Byte.class) || field.getType().getName().equals("byte")) {
                    field.setByte(o, (byte) cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(Double.class) || field.getType().getName().equals("double")) {
                    field.setDouble(o, cell.getNumericCellValue());
                } else if (field.getType().isAssignableFrom(String.class)) {
                    String s = String.valueOf(cell.getNumericCellValue());
                    if (s.contains("E")) {
                        s = s.trim();
                        BigDecimal bigDecimal = new BigDecimal(s);
                        s = bigDecimal.toPlainString();
                    }
                    //防止整数判定为浮点数
                    if (s.endsWith(".0"))
                        s = s.substring(0, s.indexOf(".0"));
                    field.set(o, s);
                } else {
                    field.set(o, cell.getNumericCellValue());
                }
            }
            break;
        case STRING:
            if (field.getType().getName().equals(Date.class.getName())) {
                field.set(o, format.parse(cell.getRichStringCellValue().getString()));
            } else {
                field.set(o, cell.getRichStringCellValue().getString());
            }
            break;
        default:
            field.set(o, cell.getStringCellValue());
            break;
    }
}
 

void setField(char primitiveType, Object o, Field f,
        Class expected, Object value) {
    try {
        primitiveType = Character.toUpperCase(primitiveType);
        switch (primitiveType) {
        case 'I': // int
            f.setInt(o, ((Integer) value).intValue());
            break;
        case 'J': // long
            f.setLong(o, ((Long) value).longValue());
            break;
        case 'Z': // boolean
            f.setBoolean(o, ((Boolean) value).booleanValue());
            break;
        case 'S': // short
            f.setShort(o, ((Short) value).shortValue());
            break;
        case 'B': // byte
            f.setByte(o, ((Byte) value).byteValue());
            break;
        case 'C': // char
            f.setChar(o, ((Character) value).charValue());
            break;
        case 'D': // double
            f.setDouble(o, ((Double) value).doubleValue());
            break;
        case 'F': // float
            f.setFloat(o, ((Float) value).floatValue());
            break;
        default:
            f.set(o, value);
        }
        // Since 2011, members are always accessible and throwing is optional
        assertTrue("expected " + expected + " for " + f.getName() + " = " + value,
                expected == null || expected == IllegalAccessException.class);
    } catch (Exception e) {
        if (expected == null) {
            e.printStackTrace();
            fail("unexpected exception " + e + " for field "
                    + f.getName() + ", value " + value);
        } else {
            assertTrue("expected exception "
                    + expected.getName() + " and got " + e
                    + " for field " + f.getName() + ", value " + value,
                    e.getClass().equals(expected));
        }
    }
}
 

private static void setInstanceValue(@NonNull Field field, @NonNull Object obj,
        @NonNull Bundle bundle, @NonNull String key, boolean isGson)
        throws IllegalArgumentException, IllegalAccessException {

    if (isGson) {
        field.set(obj, GsonHelper.fromJson(bundle.getString(key), field.getGenericType()));
        return;
    }

    Class<?> type = field.getType();

    Type[] genericTypes = null;
    if (field.getGenericType() instanceof ParameterizedType) {
        genericTypes = ((ParameterizedType) field.getGenericType()).getActualTypeArguments();
    }

    if (type.equals(Boolean.TYPE)) {
        field.setBoolean(obj, bundle.getBoolean(key));

    } else if (type.equals(boolean[].class)) {
        field.set(obj, bundle.getBooleanArray(key));

    } else if (type.equals(Bundle.class)) {
        field.set(obj, bundle.getBundle(key));

    } else if (type.equals(Byte.TYPE)) {
        field.setByte(obj, bundle.getByte(key));

    } else if (type.equals(byte[].class)) {
        field.set(obj, bundle.getByteArray(key));

    } else if (type.equals(Character.TYPE)) {
        field.setChar(obj, bundle.getChar(key));

    } else if (type.equals(char[].class)) {
        field.set(obj, bundle.getCharArray(key));

    } else if (type.equals(CharSequence.class)) {
        field.set(obj, bundle.getCharSequence(key));

    } else if (type.equals(CharSequence[].class)) {
        field.set(obj, bundle.getCharSequenceArray(key));

    } else if (type.equals(Double.TYPE)) {
        field.setDouble(obj, bundle.getDouble(key));

    } else if (type.equals(double[].class)) {
        field.set(obj, bundle.getDoubleArray(key));

    } else if (type.equals(Float.TYPE)) {
        field.setFloat(obj, bundle.getFloat(key));

    } else if (type.equals(float[].class)) {
        field.set(obj, bundle.getFloatArray(key));

    } else if (type.equals(Integer.TYPE)) {
        field.setInt(obj, bundle.getInt(key));

    } else if (type.equals(int[].class)) {
        field.set(obj, bundle.getIntArray(key));

    } else if (type.equals(Long.TYPE)) {
        field.setLong(obj, bundle.getLong(key));

    } else if (type.equals(long[].class)) {
        field.set(obj, bundle.getLongArray(key));

    } else if (type.equals(Short.TYPE)) {
        field.setShort(obj, bundle.getShort(key));

    } else if (type.equals(short[].class)) {
        field.set(obj, bundle.getShortArray(key));

    } else if (type.equals(String.class)) {
        field.set(obj, bundle.getString(key));

    } else if (type.equals(String[].class)) {
        field.set(obj, bundle.getStringArray(key));

    } else if (Parcelable.class.isAssignableFrom(type)) {
        field.set(obj, bundle.getParcelable(key));

    } else if (type.equals(ArrayList.class)
            && genericTypes != null
            && genericTypes[0] instanceof Class
            && Parcelable.class.isAssignableFrom((Class<?>) genericTypes[0])) {
        field.set(obj, bundle.getParcelableArrayList(key));

    } else if (type.isArray() && Parcelable.class.isAssignableFrom(type.getComponentType())) {
        field.set(obj, bundle.getParcelableArray(key));

    } else if (Serializable.class.isAssignableFrom(type)) {
        field.set(obj, bundle.getSerializable(key));

    } else {
        throw new RuntimeException("Unsupported field type: " + field.getName()
                + ", " + type.getSimpleName());
    }

    bundle.remove(key);
}