今天学习到很多东西（从ITAT试题中吸取到的）……

 今天做了一下上周日参加的ITAT大赛的未做完的试题，一是用PreparedStatement处理数据库的问题，我已经做出来了，代码贴一哈，在这里秀秀，欢迎拍砖!

/**
 * @(#)T6.java
 *
 *
 * @author Xie Xiaojin
 * @version 1.00 2009/11/3
 */
import java.sql.*;

public class T6 {
 private String[][] values = {
 {"200731102075", "Ma Junjun", "M", "20", "Computer Science & Technoloty 072", "83"},
 {"200731102076", "Xie Xiaojin", "M", "21", "Computer Science & Technoloty 072", "84"},
 {"200731102077", "Cai Fan", "M", "21", "Computer Science & Technoloty 072", "85"},
 {"200731102078", "Xia Haibin", "M", "21", "Computer Science & Technoloty 072", "86"},
 {"200731102079", "Wu Dianyu", "M", "22", "Computer Science & Technoloty 072", "87"} 
 };
    public T6() {
     try{
      Class.forName("com.mysql.jdbc.Driver");
      Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "sxwxujn89313!@#");
      PreparedStatement pstmt = con.prepareStatement("update Student_1 set name = ?, sex = ?, class = ? where no = ?; ");
      try{
       for(int i = 0; i < values.length; i++){
        pstmt.setString(1, values[i][1]);
        pstmt.setString(2, values[i][2]);
        pstmt.setString(3, values[i][4]);
        pstmt.setString(4, values[i][0]);
        pstmt.executeUpdate();
       }
      }catch(SQLException ex){
       System.err.println("不能修改数据！");
      }
      ResultSet rs = pstmt.executeQuery("select * from Student_1; ");
      while(rs.next()){
       System.out.println(rs.getString(1) + "/t" + rs.getString(2) + "/t" + rs.getString(3)+ "/t" + rs.getString(4)+
        "/t" + rs.getString(5)+ "/t" + rs.getString(6) );
      }
      rs.close();
      pstmt.close();
      con.close();
     }catch(Exception ex){
      ex.printStackTrace();
     }
    }
    public static void main (String[] args) {
     new T6();
}
}

 

另一个是Serializable序列化问题，也做出来了，不过都是大赛完毕之后做出来的，代码也贴在这儿

/**
 * @(#)T3.java
 *
 *
 * @author Xie Xiaojin
 * @version 1.00 2009/11/3
 */
import java.io.*;

public class T3 {
 private ObjectOutputStream oos;
 private ObjectInputStream ois;
 private Student student1 = new Student(200731102076L, "Xie Xiaojin", "Computer Science & Technology School", 84);
    public T3() {
     try{
      oos = new ObjectOutputStream(new FileOutputStream("Student.ser"));
      ois = new ObjectInputStream(new FileInputStream("Student.ser"));
      oos.writeObject(student1);
      oos.flush();
      Student student2 = (Student)(ois.readObject());
      System.out.println(student2);
     }catch(IOException ex){
      ex.printStackTrace();
     }catch(ClassNotFoundException ex){
      ex.printStackTrace();
     }finally{
      try{
       oos.close();
       ois.close();
      }catch(IOException ex){
       ex.printStackTrace();
      }
     }
    }
    public static void main (String[] args) {
     new T3();
}
}
class Student implements Serializable{
 private long id;
 private String name;
 private String depart;
 private int score;
 public Student(){
  this(200731102076L, "Xie Xiaojin", "Computer Science & Technology School", 84);
 }
 public Student(long id, String name, String depart, int score){
  this.id = id;
  this.name = name;
  this.depart = depart;
  this.score = score;
 }
 public long getId(){
  return id;
 }
 public void setId(long id){
  this.id = id;
 }
 public String getName(){
  return name;
 }
 public void setName(String name){
  this.name = name;
 }
 public String getDepart(){
  return depart;
 }
 public void setDepart(String depart){
  this.depart = depart;
 }
 public int getScore(){
  return score;
 }
 public void setScore(int score){
  this.score = score;
 }
 public String toString(){
  return id + "/t" + name + "/t" + depart + "/t" + score;
 }
}

题目要求是要序列化属性，而不序列化方法，我找来找去都找不到相关的例子或者文字，只好在优快云上问了一句，好心人说根本没有序列化方法这种说法，我不知道，且悬之在这儿！！下面我又想这样多不好啊，要是能序列化到XML文档里不是更好吗，既可读性高有能处理大量数据，好处多多，于是我又在书上翻来翻去，在网上找来找去，终于找到了一个比较完美的解决办法，而且都试着学习那些很好的例子，我就将他们的博客转帖了过来，然后又有个org.apache.crimson.tree包，也终于在http://xml.apache.org/crimson/上找到了，然后将解压缩得到的crimson.jar包复制到java/lib/ext/目录下，试试，果然能行了，真是个不错的解决方案啊，happy！