JAVA反射机制示例，读取excel数据映射到JAVA对象中

import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;

/**
 * 读取excel数据映射到指定bean中
 * @author
 * May 30, 2016 5:38:33 PM
 */
public class MyExcelReader {
    /**
     *
     * @author
     * May 30, 2016 5:39:01 PM
     * @param beginRow
     * @param beanpros
     * @param classPathName
     * @param results
     * @param sheet
     * @return
     */
    public String getDatasByrc(int beginRow,Map<Integer,String> beanpros,String classPathName,List<Object> results,Sheet sheet){
        try {
            Class clazz = Class.forName(classPathName);
            Set<Integer> set = beanpros.keySet() ;
            Row row = sheet.getRow(beginRow);
            while(row!=null) {
                Object obj = clazz.newInstance() ;
                for(Integer key:set){
                    String value = "" ;
                    if(row!=null){
                        Cell cell = row.getCell(key) ;
                        if(cell!=null){
                            int type = cell.getCellType() ;
                            if(type == Cell.CELL_TYPE_STRING){
                                value = cell.getStringCellValue() ;
                            }else if(type==Cell.CELL_TYPE_NUMERIC||type==Cell.CELL_TYPE_FORMULA){
                                value = String.valueOf(cell.getNumericCellValue());
                            }else if(type==Cell.CELL_TYPE_BOOLEAN){
                                value = String.valueOf(cell.getBooleanCellValue()) ;
                            }
                        }
                    }
                    PropertyDescriptor pd = new PropertyDescriptor(beanpros.get(key),clazz);
                    Method wM = pd.getWriteMethod();
                    wM.invoke(obj, value);
                }
                results.add(obj);
                row = sheet.getRow(++beginRow);
            }
        } catch (Exception e) {
            e.printStackTrace();
            return "用于接受结果的bean不存在";
        }

        return null ;
    }

    public static void main(String[] args) {
        MyExcelReader mer = new MyExcelReader() ;
        try {
            HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(new File("D:/testimport.xls")));
            Sheet sheet = wb.getSheetAt(0);
            List<Object> results = new ArrayList<Object>() ;
            Map<Integer,String> beanpros = new HashMap<Integer, String>() ;
            beanpros.put(0, "username");
            beanpros.put(1, "password");
            String s = mer.getDatasByrc(0, beanpros, "SysUser", results, sheet);
            if(s==null){
                for(Object obj:results){
                    SysUser bean = (SysUser) obj ;
                    System.out.println(bean.getUsername()+"---"+bean.getPassword());
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class SysUser {

    private String username;
    private String password;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

Excel数据

输出结果：