需求：需要自增长注解如MyId0001、MyId0002、MyId0003

实现：实现这个接口org.hibernate.id.IdentifierGenerator

一、MyIdGenerator.java(测试用，实际项目中获取链接等可以改变)

import java.io.Serializable;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import org.apache.commons.lang.StringUtils;

import org.hibernate.HibernateException;

import org.hibernate.engine.SessionImplementor;

import org.hibernate.id.IdentifierGenerator;

public class MyIdGenerator implements IdentifierGenerator{

    @Override

    public Serializable generate(SessionImplementor session, Object object)

            throws HibernateException {

        String prefix = "MyId";

        Connection connection = session.connection();

        try {

            PreparedStatement ps = connection

                    .prepareStatement("SELECT nextval ('seq_id') as nextval");

            ResultSet rs = ps.executeQuery();

            if (rs.next()) {

                int id = rs.getInt("nextval");

                String code = prefix + StringUtils.leftPad("" + id,3, '0');

                log.debug("Generated Stock Code: " + code);

                return code;

            }

        } catch (SQLException e) {

            log.error(null, e);

            throw new HibernateException(

                    "Unable to generate Stock Code Sequence");

        }

        return null;

    }

}

二、配置hibernate主键生成策略

基于配置文件的hibernate（TestHibernateIdentifier.xml）

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.fire.front.entity">

    <class name="TestHibernateIdentifier" table="test_hibernate_identifier"  dynamic-update="true">

        <meta attribute="sync-DAO">false</meta>

        <cache usage="read-write"/>

        <id name="id" type="string" column="id">

                <generator class="com.gwold.common.util.MyIdGenerator"/>

        </id>

        <property name="name" type="string" column="name" length="40"/>

    </class>

</hibernate-mapping>

基于注解的方式

import java.io.Serializable;

import javax.persistence.Column;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import org.hibernate.annotations.GenericGenerator;

public class TestHibernateIdentifier implements Serializable{

    @Id

    @GenericGenerator(name="seq_id", strategy="com.gwold.common.util.MyIdGenerator")

    @GeneratedValue(generator="seq_id")

    @Column(name = "id", unique = true, nullable = false, length = 20)

    private String id;

    private String name;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}