java杂记

HexToInteger:

public class HexToInteger {
	public static void main(String[] args){
		int cid = 78823423;
		System.out.println((short)0x00000FFFF);  //(short)0x00000FFFF == 0xFFFF   结果为-1
		System.out.println(cid & (short)0x00000FFFF); //0x004B2BFF & 0xFFFFFFFF   结果为78823423
		System.out.println(cid & 0x00000FFFF);  //0x004B2BFF & 0x0000FFFF  结果为49151
		System.out.println(Integer.parseInt(Integer.toHexString(cid & 0x00000FFFF), 16)); //49151
		System.out.println(Integer.parseInt(String.valueOf(cid & 0x00000FFFF), 16)); //0x49151 == 299345
		System.out.println(String.valueOf(cid & 0x00000FFFF));  //49151
	}
}

equals的使用：

public class User {
	String name;
	int age;

	public User(String name, int age){
		this.name = name;
		this.age = age;
	}
	
	
	public boolean equals(Object obj){
		if(this == obj){  //this代表调用这个函数的那个对象,这个函数位于//User这个类中，则this要调用它，必须为User类型
			return true;    
			}
		
		boolean b = obj instanceof User;
		if(b){
		User u = (User)obj;
		if(this.age == u.age && this.name.equals(u.name)){//基本数据类型用==，引用数据类型用equals
			return true;
			}else{
			return false;
			}
	
		}
		else{
		return false;
		}
	}

	
	public int hashCode(){
		int result = 17;
		result = 31 * result + age;
		result = 31 * result + name.hashCode();
		return result;
	}

}

HashSet:

import java.util.HashSet;
import java.util.Set;
public class HashSetTest {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Set<String> set = new HashSet<String>();
		set.add("a");
		set.add("b");
		set.add("c");
		set.add("d");
		set.add("c");		
		int i = set.size();		
		set.remove("a");
	}
}

简单加密算法：

import java.io.UnsupportedEncodingException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Queue;

import skycomm.db.ConnectOracle;
import skycomm.db.ConnectSqlite;

public class TestMain {

	/**
	 * 位置信息解密的key值
	 */
	private final static String DECODE_KEYS_ZONE = "skycomm";

	public Map<String, String> encMap;
	public Map<String, String> decMap;
	
	public List<ImsiToAddress> list;

	public Queue<Object[]> data;

	public TestMain() {
		list = new ArrayList<ImsiToAddress>();
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ConnectSqlite sqlite = new ConnectSqlite();
		Map<String, String> map = sqlite.selectTable();
		
		TestMain tm = new TestMain();
		for (String key : map.keySet()) {
			String addr = map.get(key);
			String addrEnc = tm.enDec(addr);
			
			if (addrEnc.equals("广东 深圳")) {
				System.out.println("addr  ++++++++++++++++++ " + addrEnc);
			}			
			
			System.out.println("addr " + addrEnc);
		}
		
//		ConnectOracle oracle = new ConnectOracle();
//		ResultSet rs = oracle.selectImsiToAddress("INFO_IMSITOADDRESSENC");
//
//		TestMain tm = new TestMain();
//		try {
//
//			while (rs.next()) {
//				String imsi = rs.getString("imsi");
//				String addrDec = rs.getString("address");
//
//				if (!imsi.equals("")) {
//					// tm.decMap.put(imsi, addrDec);
//
//					// 加密
//					String encAddr = tm.enDec(addrDec);
//					ImsiToAddress im = new ImsiToAddress();
//					im.setImsi(imsi);
//					im.setAddress(encAddr);
//					
//					tm.list.add(im);
//				}
//			}
//
//			ConnectSqlite sqlite = new ConnectSqlite();
//			sqlite.InsertWithTransaction(tm.list, "tb_CodeToAddress");

//		} catch (SQLException e) {
//			e.printStackTrace();
//		}
//		oracle.close();

	}

	/**
	 * 解密位置信息
	 * 
	 * @param addr
	 *            位置信息
	 * @return
	 */
	private String enDec(String addr) {
		byte b_addr[];
		byte b_key[];
		try {
			b_addr = addr.getBytes("GBK");
			b_key = DECODE_KEYS_ZONE.getBytes("GBK");

			for (int i = 0; i < b_addr.length;) {
				for (int j = 0; j < b_key.length && i < b_addr.length; ++i, ++j) {
					b_addr[i] ^= b_key[j];
				}
			}

			return new String(b_addr, "GBK");
		} catch (UnsupportedEncodingException e) {
			return "";
		}
	}
}