利用java反射機制，將數據庫結果集封裝成對象

源碼如下：

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class RsBeanUtil {
 private Object[] beanMatch(Class clazz, String beanProperty) {
  Object[] result = new Object[2];
  char beanPropertyChars[] = beanProperty.toCharArray();
  beanPropertyChars[0] = Character.toUpperCase(beanPropertyChars[0]);
  String s = new String(beanPropertyChars);
  String names[] = { ("set" + s).intern(), ("get" + s).intern(),
    ("is" + s).intern(), ("write" + s).intern(),
    ("read" + s).intern() };
  Method getter = null;
  Method setter = null;
  Method methods[] = clazz.getMethods();
  for (int i = 0; i < methods.length; i++) {
   Method method = methods[i];
   // 只取公共字段
   if (!Modifier.isPublic(method.getModifiers()))
    continue;
   String methodName = method.getName().intern();
   for (int j = 0; j < names.length; j++) {
    String name = names[j];
    if (!name.equals(methodName))
     continue;
    if (methodName.startsWith("set")
      || methodName.startsWith("read"))
     setter = method;
    else
     getter = method;
   }
  }
  result[0] = getter;
  result[1] = setter;
  return result;
 }

 public void beanRegister(Object object, String beanProperty, String value) {
  Object[] beanObject = beanMatch(object.getClass(), beanProperty);
  Object[] cache = new Object[1];
  Method getter = (Method) beanObject[0];
  Method setter = (Method) beanObject[1];
  try {
   // 通過get獲得方法類型
   String methodType = getter.getReturnType().getName();
   if (methodType.equalsIgnoreCase("long")
     || methodType.equalsIgnoreCase("java.lang.Long")) {
    cache[0] = new Long(value);
    setter.invoke(object, cache);
   } else if (methodType.equalsIgnoreCase("int")
     || methodType.equalsIgnoreCase("java.lang.Integer")) {
    cache[0] = new Integer(value);
    setter.invoke(object, cache);
   } else if (methodType.equalsIgnoreCase("short")) {
    cache[0] = new Short(value);
    setter.invoke(object, cache);
   } else if (methodType.equalsIgnoreCase("float")) {

    cache[0] = new Float(value);
    setter.invoke(object, cache);
   } else if (methodType.equalsIgnoreCase("double")
     || methodType.equalsIgnoreCase("java.lang.Double")) {
    cache[0] = new Double(value);
    setter.invoke(object, cache);
   } else if (methodType.equalsIgnoreCase("boolean")) {
    cache[0] = new Boolean(value);
    setter.invoke(object, cache);
   } else if (methodType.equalsIgnoreCase("java.lang.String")) {
    cache[0] = value;
    setter.invoke(object, cache);
   } else if (methodType.equalsIgnoreCase("java.io.InputStream")) {
   } else if (methodType.equalsIgnoreCase("char")) {
    cache[0] = (Character.valueOf(value.charAt(0)));
    setter.invoke(object, cache);
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 public Collection get(final ResultSet result, final Class clazz) {
  Collection collection = null;
  try {
   ResultSetMetaData rsmd = result.getMetaData();
   // 獲得數據列數
   int cols = rsmd.getColumnCount();
   // 創建等同數據列數的arraylist類型collection實例
   collection = new ArrayList(cols);
   // 遍歷結果集
   while (result.next()) {
    // 創建對象
    Object object = null;
    try {
     // 從class獲得對象實體
     object = clazz.newInstance();
    } catch (Exception e) {
     e.printStackTrace();
    }
    // 循環每條記錄
    for (int i = 1; i <= cols; i++) {
     beanRegister(object, rsmd.getColumnName(i), result
       .getString(i));
    }
    // 將數據插入collection
    collection.add(object);
   }
  } catch (SQLException e) {
   System.err.println(e.getMessage());
  } finally {

  }
  return collection;
 }

}