import java.lang.reflect.Method;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.util.HashMap;import java.util.Map;import com.bjsxt.hibernate.model.Student;public class Session {    String tableName = "_Student";    Map<String, String> cfs = new HashMap<String, String>();    String[] methodNames;// 用于存入实体类中的get方法数组    public Session() {        cfs.put("_id", "id");        cfs.put("_name", "name");        cfs.put("_age", "age");        methodNames = new String[cfs.size()];    }    public void save(Student s) throws Exception {        String sql = createSQL();// 创建SQL串                Class.forName("com.mysql.jdbc.Driver");        Connection conn = DriverManager.getConnection(                "jdbc:mysql://xxx:3306/xxx?characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull", "xxx",                "xxx");        PreparedStatement ps = conn.prepareStatement(sql);        for (int i = 0; i < methodNames.length; i++) {            Method m = s.getClass().getMethod(methodNames[i]);// 返回一个 Method                                                                // 对象，它反映此 Class                                                                // 对象所表示的类或接口的指定公共成员方法            Class r = m.getReturnType();// 返回一个 Class 对象，该对象描述了此 Method                                        // 对象所表示的方法的正式返回类型            if (r.getName().equals("java.lang.String")) {                // 对带有指定参数的指定对象调用由此 Method 对象表示的底层方法。                // 个别参数被自动解包，以便与基本形参相匹配，基本参数和引用参数都随需服从方法调用转换                String returnValue =http://www.mamicode.com/ (String) m.invoke(s);                ps.setString(i + 1, returnValue);            }            if (r.getName().equals("int")) {                Integer returnValue = (Integer) m.invoke(s);                ps.setInt(i + 1, returnValue);            }            if (r.getName().equals("java.lang.String")) {                String returnValue = (String) m.invoke(s);                ps.setString(i + 1, returnValue);            }            System.out.println(m.getName() + "|" + r.getName());        }        ps.executeUpdate();        ps.close();        conn.close();    }    private String createSQL() {        String str1 = "";        int index = 0;        for (String s : cfs.keySet()) {            String v = cfs.get(s);// 取出实体类成员属性            v = Character.toUpperCase(v.charAt(0)) + v.substring(1);// 将成员属性第一个字符大写            methodNames[index] = "get" + v;// 拼实体类成员属性的getter方法            str1 += s + ",";// 根据表中字段名拼成字段串            index++;        }        str1 = str1.substring(0, str1.length() - 1);        String str2 = "";        // 根据表中字段数，拼成?串        for (int i = 0; i < cfs.size(); i++) {            str2 += "?,";        }        str2 = str2.substring(0, str2.length() - 1);        String sql = "insert into " + tableName + "(" + str1 + ")"                + " values (" + str2 + ")";        System.out.println(sql);        return sql;    }}

package com.bjsxt.hibernate.model;public class Student {    private int id;    private String name;    private int age;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }}

import com.bjsxt.hibernate.model.Student;public class StudentTest {    public static void main(String[] args) throws Exception {        Student s = new Student();        s.setName("xx");        s.setAge(2);        s.setId(2);                Session session = new Session();                session.save(s);            }}