把反射的一些相關東西弄到一起變成現在這個工具包
package com.lovo.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
public class ReflectUtil {
private Class myClass = null;
Object obj = null;
private String className;
public ReflectUtil() {
}
public ReflectUtil(String className) {
try {
this.myClass
= Class.forName(className);
} catch (ClassNotFoundException
e) {
e.printStackTrace();
}
}
public Object createObject() {
try {
obj =
myClass.newInstance();
} catch (InstantiationException
e) {
e.printStackTrace();
} catch (IllegalAccessException
e) {
e.printStackTrace();
}
return obj;
}
public Object createObject(Class[]
paramTypes,Object[] paramValues) {
//如果參數類型為空或個數為0,則調用無參構造方法
if(paramTypes==null
||paramTypes.length==0){
obj =
this.createObject();
}else{
Constructor
myConstructor = null;
try {
myConstructor
= this.myClass.getConstructor(paramTypes);
obj
= (Object) myConstructor.newInstance(paramValues);
} catch
(Exception e) {
e.printStackTrace();
}
}
return obj;
}
private Method getMethod(String methodname)
{
Method method = null;
Method[] methods =
myClass.getMethods();
for (int i = 0; i
< methods.length; i++) {
if
(methods[i].getName().equals(methodname)) {
method
= methods[i];
break;
}
}
return method;
}
public Object methodRun(String methodName,
Object[] args) {
Object result =
methodInvoke(getMethod(methodName), args);
;
return result;
}
private Object methodInvoke(Method method,
Object[] args) {
Object result = null;
try {
//
反射底層方法(調用方法對象的invoke方法)
//
invoke說明：調用obj實例對象的方法(相當于:obj.xXX();
if(args==null
|| args.length==0){
result
= method.invoke(obj, new Object[]{null});
}else{
result
= method.invoke(obj, args);
}
} catch
(IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException
e) {
e.printStackTrace();
} catch
(InvocationTargetException e) {
e.printStackTrace();
}
return result;
}
public List<String>
getMethodNameList() {
List<String>
list = new ArrayList<String>();
if (obj != null) {
Class cls =
obj.getClass();
Method[]
method = cls.getMethods();
for (int i =
0; i < method.length; i++) {
list.add(method[i].getName());
}
}
return list;
}
public String[] getObjFieldsName() {
Field[] fields =
obj.getClass().getDeclaredFields();
String[] names = new
String[fields.length];
for (int i = 0; i
< fields.length; i++) {
names[i] =
fields[i].getName();
}
return names;
}
public Object[] getObjAttValues(String[] attList)
{
// 獲取類的屬性列表
Object[] data = new
Object[attList.length];
for (int k = 0; k
< attList.length; k++) {
//
指定位置屬性
String
fieldName = attList[k];
//
根據屬性計算得到get方法名
String
methodName = getMethodName("get", fieldName);
try {
//
定義參數對象
Class[]
types = new Class[] {};
//
根據方法和參數對象,得到指定方法對象
Method
method = obj.getClass().getMethod(methodName, types);
//
執行方法對象對應的方法(注意也要有參數)
Object
result = method.invoke(obj, new Object[0]);
data[k]
= result;
} catch
(Exception e) {
e.printStackTrace();
}
}
return data;
}
public Object[] getObjAttValues(int[] fieldOrder)
{
// 獲取類的屬性列表
Field[] fields =
obj.getClass().getDeclaredFields();
Object[] data = new
Object[fieldOrder.length];
for (int k = 0; k
< fieldOrder.length; k++) {
//
指定位置屬性
String
fieldName = fields[fieldOrder[k]].getName();
//
根據屬性計算得到get方法名
String
methodName = getMethodName("get", fieldName);
try {
//
定義參數對象
Class[]
types = new Class[] {};
//
根據方法和參數對象,得到指定方法對象
Method
method = obj.getClass().getMethod(methodName, types);
//
執行方法對象對應的方法(注意也要有參數)
Object
result = method.invoke(obj, new Object[0]);
data[k]
= result;
} catch
(Exception e) {
e.printStackTrace();
}
}
return data;
}
public void copyValuesFromArray(Object[] values)
{
// 獲取類的屬性列表
Field[] fields =
obj.getClass().getDeclaredFields();
try {
for (int i =
0; i < fields.length; i++) {
//
根據屬性計算得到get方法名
String
methodName = getMethodName("set", fields[i].getName());
Method
method = obj.getClass().getDeclaredMethod(methodName,
new
Class[] { fields[i].getType() });
String
name = fields[i].getType().getName();
if
(values[i] != null) {
if(name.equals("java.lang.Integer")){
Integer
tmpInteger = null;
try{
tmpInteger
= Integer.valueOf(values[i].toString());
}catch(Exception
e){
tmpInteger
= null;
}
method.invoke(obj,new
Object[]{tmpInteger});
}else
if(name.equals("java.lang.Double")){
method.invoke(obj,new
Object[]{Double.valueOf(values[i].toString())});
}else
if (name.equals("java.sql.Date")) {
java.sql.Date
dt = StringToDate(values[i].toString());
method.invoke(obj,
new Object[] { dt });
}
else {
method.invoke(obj,
new Object[] { values[i] });
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public String objToString() {
StringBuffer sb = new
StringBuffer();
// 獲取類的屬性列表
Field[] fields =
obj.getClass().getDeclaredFields();
for (int i = 0; i
< fields.length; i++) {
//
根據屬性計算得到get方法名
String
methodName = getMethodName("get", fields[i].getName());
try {
//
定義參數對象
Class[]
types = new Class[] {};
//
根據方法和參數對象,得到指定方法對象
Method
method = obj.getClass().getMethod(methodName, types);
//
執行方法對象對應的方法(注意也要有參數)
Object
result = method.invoke(obj, new Object[0]);
sb.append(fields[i].getName()
+ "=" + result + ""t");
} catch
(Exception e) {
e.printStackTrace();
}
}
return sb.toString();
}
public Object getObj() {
return obj;
}
public void setObj(Object obj) {
this.obj = obj;
}
public String getClassName() {
return className;
}
public void setClassName(String className)
{
this.className =
className;
}
private static String getMethodName(String
prefix, String fieldName) {
return new
StringBuffer(prefix).append(
fieldName.substring(0,
1).toUpperCase()).append(
fieldName.substring(1)).toString();
}
private static java.sql.Date StringToDate(String
dtStr) {
if (dtStr == null ||
dtStr.trim().length() == 0) {
return
null;
} else {
java.util.Date
date = null;
try {
//
注意是大寫的MM
SimpleDateFormat
sdf = new SimpleDateFormat("yyyy-MM-dd");
date
= sdf.parse(dtStr);
return
new java.sql.Date(date.getTime());
} catch
(ParseException ex) {
ex.printStackTrace();
return
null;
}
}
}
}