A. 有两个方法:

1). int i = Integer.parseInt([String]); 或
i = Integer.parseInt([String],[int radix]);

2). int i = Integer.valueOf(my_str).intValue();

注: 字串转成 Double, Float, Long 的方法大同小异.

1.) String s = String.valueOf(i);

2.) String s = Integer.toString(i);

3.) String s = "" + i;

注: Double, Float, Long 转成字串的方法大同小异.

package com.magicalign.ortholink.database;import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;/*** 插入数据到数据库* * @CopyRight: MagicAlign.com* @author Hanshenquan* @time 2016年3月15日20:09:43*/
public class WriteToDatabase {private static String[] mQuestion;private static String[] mAnswera;private static String[] mAnswerb;private static String[] mAnswerc;private static String[] mAnswerd;private static String[] mAnswere;private static String[] mAnswerf;private static String[] mExamExplain;private static String[] mTrueAnswer;// 数据库中数据个数，因为我的数据库里有150条记录private static int mDataNumber = 150;public static void main(String[] args) throws IOException, SQLException {// TODO Auto-generated method stubWriteToDatabase.initStringArray();WriteToDatabase.insertIntoDatabase();}/*** 写每一个字段数据* * @param array* @param path* @throws IOException*/private static void writeQuestion(String[] str, String path)throws IOException {BufferedReader bf = new BufferedReader(new FileReader(path));str = new String[mDataNumber];for (int i = 0; i < mDataNumber; i++) {str[i] = bf.readLine().trim();}bf.close();for (int i = 0; i < mDataNumber; i++) {System.out.println(str[i]);}}/*** 得到字符串数组* * @throws IOException* */private static void initStringArray() throws IOException {writeQuestion(mQuestion, "D://data/question.txt");writeQuestion(mAnswera, "D://data/Answera.txt");writeQuestion(mAnswerb, "D://data/Answerb.txt");writeQuestion(mAnswerc, "D://data/Answerc.txt");writeQuestion(mAnswerd, "D://data/Answerd.txt");writeQuestion(mAnswere, "D://data/Answere.txt");writeQuestion(mExamExplain, "D://data/ExamExplain.txt");writeQuestion(mTrueAnswer, "D://data/TrueAnswer.txt");}/*** 执行插入数据库操作* * @throws SQLException*/private static void insertIntoDatabase() throws SQLException {Connection conn = DBCon.getConnect();for (int i = 0; i < mDataNumber; i++) {String sql = "insert into examination values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";PreparedStatement pst = conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);pst.setInt(1, i + 1);pst.setInt(2, 1);pst.setInt(3, 1);pst.setString(4, mQuestion[i]);pst.setString(5, mAnswera[i]);pst.setString(6, mAnswerb[i]);pst.setString(7, mAnswerc[i]);pst.setString(8, mAnswerd[i]);pst.setString(9, mAnswere[i]);pst.setString(10, "");// f 默认为空pst.setString(11, "");// gpst.setString(12, mExamExplain[i]);pst.setInt(13, 0);// totalnumberpst.setInt(14, 0);// wrongnumberpst.setString(15, mTrueAnswer[i]);pst.setInt(16, 1);pst.executeUpdate();pst.close();conn.close();}}}