利用java反射原理写了一个简单赋值和取值通用类【改】

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
* java bean 反射工具
*/
public class BeanRefUtil {

/**
* 取Bean的属性和值对应关系的MAP
* @param bean
* @return Map
*/
public static Map<String, String> getFieldValueMap(Object bean) {
Class<?> cls = bean.getClass();
Map<String, String> valueMap = new HashMap<String, String>();
// 取出bean里的所有方法
Method[] methods = cls.getDeclaredMethods();
Field[] fields = cls.getDeclaredFields();

for (Field field : fields) {
try {
String fieldType = field.getType().getSimpleName();
String fieldGetName = parGetName(field.getName());
if (!checkGetMet(methods, fieldGetName)) {
continue;
}
Method fieldGetMet = cls
.getMethod(fieldGetName, new Class[] {});
Object fieldVal = fieldGetMet.invoke(bean, new Object[] {});
String result = null;
if ("Date".equals(fieldType)) {
result = fmtDate((Date) fieldVal);
} else {
if (null != fieldVal) {
result = String.valueOf(fieldVal);
}
}
String fieldKeyName = parKeyName(field.getName());
valueMap.put(fieldKeyName, result);
} catch (Exception e) {
continue;
}
}
return valueMap;

}

/**
* set属性的值到Bean
* @param bean
* @param valMap
*/
public static void setFieldValue(Object bean, Map<String, String> valMap) {
Class<?> cls = bean.getClass();
// 取出bean里的所有方法
Method[] methods = cls.getDeclaredMethods();
Field[] fields = cls.getDeclaredFields();

for (Field field : fields) {
try {

String fieldSetName = parSetName(field.getName());
if (!checkSetMet(methods, fieldSetName)) {
continue;
}
Method fieldSetMet = cls.getMethod(fieldSetName, field
.getType());
String fieldKeyName = parKeyName(field.getName());
String value = valMap.get(fieldKeyName);
if (null != value && !"".equals(value)) {
String fieldType = field.getType().getSimpleName();
if ("String".equals(fieldType)) {
fieldSetMet.invoke(bean, value);
} else if ("Date".equals(fieldType)) {
Date temp = parseDate(value);
fieldSetMet.invoke(bean, temp);
} else if ("Integer".equals(fieldType)
|| "int".equals(fieldType)) {
Integer intval = Integer.parseInt(value);
fieldSetMet.invoke(bean, intval);
} else if ("Long".equalsIgnoreCase(fieldType)) {
Long temp = Long.parseLong(value);
fieldSetMet.invoke(bean, temp);
} else if ("Double".equalsIgnoreCase(fieldType)) {
Double temp = Double.parseDouble(value);
fieldSetMet.invoke(bean, temp);
} else if ("Boolean".equalsIgnoreCase(fieldType)) {
Boolean temp = Boolean.parseBoolean(value);
fieldSetMet.invoke(bean, temp);
} else {
System.out.println("not supper type" + fieldType);
}
}
} catch (Exception e) {
continue;
}
}

}

/**
* 格式化string为Date
* @param datestr
* @return date
*/
public static Date parseDate(String datestr) {
if (null == datestr || "".equals(datestr)) {
return null;
}
try {
String fmtstr = null;
if (datestr.indexOf(':') > 0) {
fmtstr = "yyyy-MM-dd HH:mm:ss";
} else {

fmtstr = "yyyy-MM-dd";
}
SimpleDateFormat sdf = new SimpleDateFormat(fmtstr, Locale.UK);
return sdf.parse(datestr);
} catch (Exception e) {
return null;
}
}

/**
* 日期转化为String
* @param date
* @return date string
*/
public static String fmtDate(Date date) {
if (null == date) {
return null;
}
try {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",
Locale.US);
return sdf.format(date);
} catch (Exception e) {
return null;
}
}

/**
* 判断是否存在某属性的 set方法
* @param methods
* @param fieldSetMet
* @return boolean
*/
public static boolean checkSetMet(Method[] methods, String fieldSetMet) {
for (Method met : methods) {
if (fieldSetMet.equals(met.getName())) {
return true;
}
}
return false;
}

/**
* 判断是否存在某属性的 get方法
* @param methods
* @param fieldGetMet
* @return boolean
*/
public static boolean checkGetMet(Method[] methods, String fieldGetMet) {
for (Method met : methods) {
if (fieldGetMet.equals(met.getName())) {
return true;
}
}
return false;
}

/**
* 拼接某属性的 get方法
* @param fieldName
* @return String
*/
public static String parGetName(String fieldName) {
if (null == fieldName || "".equals(fieldName)) {
return null;
}
int startIndex = 0;
if(fieldName.charAt(0)=='_')
startIndex = 1;
return "get" + fieldName.substring(startIndex, startIndex + 1).toUpperCase()
+ fieldName.substring(startIndex + 1);
}

/**
* 拼接在某属性的 set方法
* @param fieldName
* @return String
*/
public static String parSetName(String fieldName) {
if (null == fieldName || "".equals(fieldName)) {
return null;
}
int startIndex = 0;
if(fieldName.charAt(0)=='_')
startIndex = 1;
return "set" + fieldName.substring(startIndex, startIndex + 1).toUpperCase()
+ fieldName.substring(startIndex + 1);
}

/**
* 获取存储的键名称（调用parGetName）
* @param fieldName
* @return 去掉开头的get
*/
public static String parKeyName(String fieldName){
String fieldGetName = parGetName(fieldName);
if(fieldGetName != null
&& fieldGetName.trim() != ""
&& fieldGetName.length() > 3){
return fieldGetName.substring(3);
}
return fieldGetName;
}

}