java反射调用set和get方法的通用类

package Io;

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;

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>();
		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(field.getName(), 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  fieldKeyName = 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;
	}

}

package Io;

public class User {

	private String name;
	private String password;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	
	
}

package Io;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.UUID;


import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Row;






import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;




/**
 * EXCEL IO操作
 * 
 * @作者 joe
 * @版本 V1.0
 * @更新时间 2014-4-18 下午4:28:01
 */
public class ExcelIo {
	
	private static   <T> String[][] parseLand(List<T> objects,Class<T> clazz) {
		int size = objects.size();
		Field[] fields = clazz.getDeclaredFields();
		String[][] content = new String[size + 1][fields.length];
		for (int i = 0; i < fields.length; i++) {
			Field f = fields[i];
			content[0][i] = f.getName();
		}
		for (int i = 0 ; i < size; i++) {
			T school = objects.get(i);
			for (int j = 0; j < fields.length; j++) {
				Field f = fields[j];
				f.setAccessible(true);
				try {
					String value = "";
					if (f.get(school) != null) {
						value = f.get(school).toString();
					}
					content[i+1][j] = value;
				} catch (IllegalArgumentException e) {
					e.printStackTrace();
				} catch (IllegalAccessException e) {
					e.printStackTrace();
				}
			}
		}
		return content;
	}


	public static String writeFile(String fileName, String[][] content) {
		WritableWorkbook wwb = null;
		String filePath = "c:\\" + fileName +".xls";
		try {
			wwb = Workbook.createWorkbook(new File(filePath));
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (wwb != null) {
			WritableSheet ws = wwb.createSheet(fileName, 1);
			for (int row = 0; row < content.length; row++) {
				for (int j = 0; j < content[row].length; j++) {
					Label labelC = new Label(j, row, content[row][j]);
					try {
						ws.addCell(labelC);
					} catch (RowsExceededException e) {
						e.printStackTrace();
					} catch (WriteException e) {
						e.printStackTrace();
					}
				}
			}
			try {
				wwb.write();
				wwb.close();
				return filePath;
			} catch (IOException e) {
				e.printStackTrace();
			} catch (WriteException e) {
				e.printStackTrace();
			}
		}
		return null;
	}
	
	public static <T> List<T> excelToClass(File file,Class<T> clazz){
		List<T> lands = new ArrayList<T>();
		try {
			FileInputStream fileInputStream = new FileInputStream(file);
			POIFSFileSystem poifs = new POIFSFileSystem(fileInputStream);
			HSSFWorkbook workbook = new HSSFWorkbook(poifs);
			HSSFSheet sheet = workbook.getSheetAt(0);
			Iterator<Row> rows = sheet.rowIterator();
			int index = 0;
			List<String> keys = new ArrayList<String>();
			while (rows.hasNext()) {
				HSSFRow row = (HSSFRow) rows.next();
				if(index == 0){
//					int num = row.getRowNum();
					int num = row.getLastCellNum();
					for(int i = 0 ; i < num;i++ ){
						HSSFCell cell = row.getCell(i);
						if(cell!=null){
							String value = getStringCellValue(cell);
							keys.add(value);
						}
					}
				}
				if(index>=1){ //决定从哪一行开始提取,这里从第一行
					Map<String,String> map = new HashMap<String, String>();
					int num = row.getLastCellNum();
					for(int i = 0 ; i < num;i++ ){
						HSSFCell cell = row.getCell(i);
						if(cell!=null){
							map.put(keys.get(i), getStringCellValue(cell));
						}
					}				
					try {
						T land = newTclass(clazz);
						BeanRefUtil.setFieldValue(land, map);
						lands.add(land);
					} catch (InstantiationException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IllegalAccessException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}					
				}
				index++;
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return lands;
	}
	
	
	private static <T> T newTclass(Class<T> clazz) throws InstantiationException, IllegalAccessException{
		T a=clazz.newInstance();
		return a;
		
	}
	
	private static String getStringCellValue(HSSFCell cell) {// 获取单元格数据内容为字符串类型的数据
		String strCell = "";
		switch (cell.getCellType()) {
		case HSSFCell.CELL_TYPE_STRING:
			strCell = cell.getStringCellValue();
			break;
		case HSSFCell.CELL_TYPE_NUMERIC:
			strCell = String.valueOf(cell.getNumericCellValue());
			break;
		case HSSFCell.CELL_TYPE_BOOLEAN:
			strCell = String.valueOf(cell.getBooleanCellValue());
			break;
		case HSSFCell.CELL_TYPE_BLANK:
			strCell = "";
			break;
		default:
			strCell = "";
			break;
		}
		if (strCell.equals("") || strCell == null) {
			return "";
		}
		return strCell;
	}


	private static String getUUID() {
		UUID uuid = UUID.randomUUID();
		String str = uuid.toString();
		return str.substring(0, 8);
	}
	
	public static void main(String[] args) {
		//写入测试
		List<User> users=new ArrayList<User>();
	   User u=new User();
	   u.setName("joe");
	   u.setPassword("123");
	   users.add(u);
	   User s=new User();
	   s.setName("sophia");
	   s.setPassword("123456");
	   users.add(s);	   
		String[][] content = parseLand(users,User.class);
		String uuid = getUUID();
		 writeFile(uuid, content);	   
		 System.out.println("写入完成");
//		 //读取测试
		 User temp=new User();
			File file = new File("c:\\" + uuid +".xls");
		 List<User> us=excelToClass(file,User.class);
		 for(User i:us)
		 {
			 System.out.println(i.getName());
			 System.out.println(i.getPassword());
		 }
		 System.out.println("读取完成");
	}
}