反射工具类
Posted jayit
tags:
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public class ReflectUtil {
private final static Logger log = Logger.getLogger(ReflectUtil.class);
public static void setFieldValue(Object target, String fname
, Object fvalue, Class<?> ftype){
if((null == target) || StringHelper.isBlank(fname)
|| ((null != fvalue) && !ftype.isPrimitive()
&& (!ftype.isAssignableFrom(fvalue.getClass())))){
log.error("setFieldValue. parameters is error: target[" + target
+ "];fname=" + fname + ";fvalue=" + fvalue
+ ";ftype=" + ftype + ";fvaluetype="+fvalue.getClass());
return;
}
Class<?> clazz = target.getClass();
try{
Method method = clazz.getDeclaredMethod("set"
+ Character.toUpperCase(fname.charAt(0))
+ fname.substring(1), new Class[] { ftype });
if(!Modifier.isPublic(method.getModifiers())){
method.setAccessible(true);
}
method.invoke(target, fvalue);
}catch (Exception ex1) {
try {
Field field = clazz.getDeclaredField(fname);
if(!Modifier.isPublic(field.getModifiers())){
field.setAccessible(true);
}
field.set(target, fvalue);
}catch (Exception ex2){
log.error("setFieldValue. setmethod is error: target="
+ target.getClass() + ";" + fname + "=" + fvalue
+ ";ftype=" + ftype + ";fvaluetype="+fvalue.getClass());
log.error(ex2.getMessage(),ex2);
}
}
}
public static Object getFieldValue(Object target, String fname) {
if (null == target || StringHelper.isBlank(fname)) {
log.error("getFieldValue. parameters is error: target="
+ target+ ";fname=" + fname);
return null;
}
boolean exCatched = false;
Class<?> clazz = target.getClass();
try {
Method method = clazz.getDeclaredMethod("get"
+ Character.toUpperCase(fname.charAt(0))
+ fname.substring(1));
if (!Modifier.isPublic(method.getModifiers())) {
method.setAccessible(true);
}
return method.invoke(target);
}catch (NoSuchMethodException e) {
exCatched = true;
}
catch (InvocationTargetException e) {
exCatched = true;
}catch (IllegalAccessException e) {
exCatched = true;
}
if (exCatched) {
try {
Field field = clazz.getDeclaredField(fname);
if (!Modifier.isPublic(field.getModifiers())) {
field.setAccessible(true);
}
return field.get(target);
}
catch (Exception ex) {
log.error("getFieldValue. " + fname
+ " cannot get value: "+ex.getMessage());
}
}
return null;
}
}
public class ClassHelper{
private final static Logger log = Logger.getLogger(ClassHelper.class);
public static void formatCommandObj(CommandObj cmdObj,Object target){
Class<?> clazz = target.getClass();
Field[] selffields = clazz.getDeclaredFields();
Field[] supfields = clazz.getSuperclass().getDeclaredFields();
Field[] fields= new Field[selffields.length+supfields.length];
System.arraycopy(selffields, 0, fields, 0, selffields.length);
System.arraycopy(supfields, 0, fields, selffields.length, supfields.length);
String fname = null;
Object fvalue = null, mvalue = null;
Class<?> ftype = null;
Map<String,String> map = cmdObj.getParams();
for (Map.Entry<String, String> o : map.entrySet()) {
fname = o.getKey();
fvalue = o.getValue();
ftype = null;
for(Field f : fields) {
if(f.getName().equals(fname)){
ftype = f.getType();
if(StringHelper.isBlank(String.valueOf(fvalue))
&& ftype.isPrimitive()){
fvalue = getPrimitiveDefaultValue(ftype);
}
try{
mvalue = cast(ftype ,fvalue, null, 0);
}catch(BtirException ex){
log.error(ex.getMessage(), ex);
}
ReflectUtil.setFieldValue(target , fname, mvalue, ftype);
break;
}
}
}
}
public static void formatResultSet(ResultSet rs,Object target){
Class<?> clazz = target.getClass();
Field[] fields = clazz.getDeclaredFields();
Column col = null;
String fname = null;
Object fvalue = null;
Class<?> ftype = null;
boolean isMatch = false;
for (Field f : fields) {
col = f.getAnnotation(Column.class);
if(null != col && StringHelper.isNotBlank(col.name())){
fname = f.getName();
ftype = f.getType();
try{
fvalue = rs.getObject(col.name());
isMatch = true;
}catch(SQLException ex){
isMatch = false;
}
if(isMatch){
if(StringHelper.isBlank(String.valueOf(fvalue))
&& ftype.isPrimitive()){
fvalue = getPrimitiveDefaultValue(ftype);
}
ReflectUtil.setFieldValue(target , fname, fvalue, ftype);
}else{
log.warn("Column ‘" + col.name() + "‘ not found.");
}
}
}
}
public static void encodeObject(ByteBuffer buffer, Object target){
Class<?> clazz = target.getClass();
Field[] fields = clazz.getDeclaredFields();
Field f = null;
Column col = null;
Map<Integer,Field> map = new HashMap<Integer,Field>();
for (Field field : fields) {
col = field.getAnnotation(Column.class);
if(null != col
&& col.seq() > 0){
map.put(col.seq(), field);
}
}
String fname = null;
Object fvalue = null;
Class<?> ftype = null;
for (Map.Entry<Integer, Field> o : map.entrySet()) {
f = o.getValue();
fname = f.getName();
fvalue = ReflectUtil.getFieldValue(target, fname);
ftype = f.getType();
try{
cast(ftype, fvalue, buffer, 1);
}catch(BtirException ex){
log.error(ex.getMessage(), ex);
}
}
}
public static void decodeObject(ByteBuffer buffer,Object target)
throws BtirException{
Class<?> clazz = target.getClass();
Field[] fields = clazz.getDeclaredFields();
Field f = null;
Column col = null;
Map<Integer,Field> map = new HashMap<Integer,Field>();
for (Field field : fields) {
col = field.getAnnotation(Column.class);
if(null != col
&& col.seq() > 0){
map.put(col.seq(), field);
}
}
String fname = null;
Object fvalue = null;
Class<?> ftype = null;
for (Map.Entry<Integer, Field> o : map.entrySet()) {
f = o.getValue();
fname = f.getName();
ftype = f.getType();
fvalue = cast(ftype, null, buffer, 2);
ReflectUtil.setFieldValue(target, fname, fvalue, ftype);
}
}
public static String formatObjectToString(Object target){
Field[] fields = target.getClass().getDeclaredFields();
StringBuilder sb = new StringBuilder("");
String fname = null;
Object fvalue = null;
for(Field f : fields) {
fname = f.getName();
fvalue = ReflectUtil.getFieldValue(target, fname);
sb.append(fname + "=" + fvalue +";");
}
return sb.toString();
}
private static Object cast(Class<?> disttype, Object orgvalue,
ByteBuffer buffer, int castType)throws BtirException{
Object distvalue = null;
String disttypename = disttype.getSimpleName().toLowerCase();
//castType??0 ?????????1 ????2 ????
if(null != orgvalue && 0 == castType
&& orgvalue.getClass().isAssignableFrom(disttype)){
return orgvalue;
}
int o_iRetval = 0;
if(disttype.isAssignableFrom(String.class)){
if(0 == castType){
distvalue = (String)orgvalue;
}else if(1 == castType){
EncodeUtil.encodeShortLen_Str(buffer, (String)orgvalue);
}else if(2 == castType){
distvalue = EncodeUtil.decodeShortLen_Str(buffer);
}else{
o_iRetval = -1;
}
}else if(disttypename.indexOf("int") != -1){
if(0 == castType){
distvalue = StringHelper.objectToInteger(orgvalue);
}else if(1 == castType){
buffer.putInt(StringHelper.objectToInteger(orgvalue));
}else if(2 == castType){
distvalue = buffer.getInt();
}else{
o_iRetval = -1;
}
}else if(disttype.isAssignableFrom(Timestamp.class)){
if(0 == castType){
distvalue = StringHelper.objectToTimestamp(orgvalue);
}else if(1 == castType){
EncodeUtil.encodeTimestampByLong(buffer
, StringHelper.objectToTimestamp(orgvalue));
}else if(2 == castType){
distvalue = EncodeUtil.decodeTimestampByLong(buffer);
}else{
o_iRetval = -1;
}
}else if(disttype.isAssignableFrom(Date.class)){
if(0 == castType){
distvalue = StringHelper.objectToDate(orgvalue);
}else{
o_iRetval = -1;
}
}else if(disttypename.indexOf("byte") != -1){
if(0 == castType){
distvalue = StringHelper.objectToByte(orgvalue);
}else if(1 == castType){
buffer.put(StringHelper.objectToByte(orgvalue));
}else if(2 == castType){
distvalue = buffer.get();
}else{
o_iRetval = -1;
}
}else if(disttypename.indexOf("short") != -1){
if(0 == castType){
distvalue = StringHelper.objectToShort(orgvalue);
}else if(1 == castType){
buffer.putShort(StringHelper.objectToShort(orgvalue));
}else if(2 == castType){
distvalue = buffer.getShort();
}else{
o_iRetval = -1;
}
}else if(disttypename.indexOf("float") != -1){
if(0 == castType){
distvalue = StringHelper.objectToFloat(orgvalue);
}else if(1 == castType){
buffer.putFloat(StringHelper.objectToFloat(orgvalue));
}else if(2 == castType){
distvalue = buffer.getFloat();
}else{
o_iRetval = -1;
}
}else if(disttypename.indexOf("long") != -1){
if(0 == castType){
distvalue = StringHelper.objectToLong(orgvalue);
}else if(1 == castType){
buffer.putLong(StringHelper.objectToLong(orgvalue));
}else if(2 == castType){
distvalue = buffer.getLong();
}else{
o_iRetval = -1;
}
}else if(disttypename.indexOf("double") != -1){
if(0 == castType){
o_iRetval = -1;
}else if(1 == castType){
buffer.putDouble(StringHelper.objectToDouble(orgvalue));
}else if(2 == castType){
distvalue = buffer.getDouble();
}else{
distvalue = StringHelper.objectToDouble(orgvalue);
}
}else if(disttypename.indexOf("char") != -1){
if(0 == castType){
distvalue = (Character)orgvalue;
}else if(1 == castType){
buffer.putChar((Character)orgvalue);
}else if(2 == castType){
distvalue = buffer.getChar();
}else{
o_iRetval = -1;
}
}else if(disttypename.indexOf("boolean") != -1){
if(0 == castType){
distvalue = Boolean.parseBoolean((String)orgvalue);
}else{
o_iRetval = -1;
}
}else if(disttype.isAssignableFrom(List.class)){
if(0 == castType){
distvalue = StringHelper.stringToList((String)orgvalue, ";");
}if(1 == castType){
EncodeUtil.encodeShortlen_StrList(buffer,
StringHelper.stringToList((String)orgvalue, ";"));
}else if(2 == castType){
distvalue = EncodeUtil.decodeShortLen_StrList(buffer);
}else{
o_iRetval = -1;
}
}else if(disttype.isAssignableFrom(String[].class)){
if(0 == castType){
if(null !=orgvalue )
distvalue = ((String)orgvalue).split(";");
}else{
o_iRetval = -1;
}
}else if(disttype.isAssignableFrom(byte[].class)){
if(0 == castType){
distvalue = StringHelper.stringToBytes((String)orgvalue, ";");
}else if(1 == castType){
EncodeUtil.encodeByteLen_Bytes(buffer, (byte[])orgvalue);
}else if(2 == castType){
distvalue = EncodeUtil.decodeByteLen_Bytes(buffer);
}else{
o_iRetval = -1;
}
}else{
o_iRetval = -1;
}
if(-1 == o_iRetval){
log.error("cast type[" + castType + "] canot found?? distype=" + disttype
+ "; orgvalue=" + orgvalue + "; buffer=" + buffer);
}
return distvalue;
}
public static String createJsonStr(Object obj){
JsonConfig config=new JsonConfig();
config.setExcludes(new String[]{"command","node","sequence","sessionId","sourceIp"});
return JSONObject.fromObject(obj,config).toString();
}
public static Object getPrimitiveDefaultValue(Class<?> type){
Map<Class<?>,Object> defaultValueMap = new HashMap<Class<?>,Object>();
defaultValueMap.put(byte.class, (byte)0);
defaultValueMap.put(short.class, (short)0);
defaultValueMap.put(int.class, 0);
defaultValueMap.put(char.class, (char)‘0‘);
defaultValueMap.put(long.class, 0l);
defaultValueMap.put(float.class, 0.0f);
defaultValueMap.put(double.class, 0.0d);
defaultValueMap.put(boolean.class, false);
return defaultValueMap.get(type);
}
}
public class Test{
@Column(seq=1,name = "tel")
private String tel;
@Column(seq=2,name = "business_code")
private String businessCode;
public Test(){
}
public Test(ResultSet rs){
ClassHelper.formatResultSet(rs, this);
}
public String getTel() {
return tel;
}
public void setTel(String tel) {
this.tel = tel;
}
public String getBusinessCode() {
return businessCode;
}
public void setBusinessCode(String businessCode) {
this.businessCode = businessCode;
}
}
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