分享一份自己写的关于ssh框架自动生成Bean的源代码和思路
一开始是想mybatis有自动生成bean的工具，但hibernate却没有或者是我没接触到，就想利用反射机制实现由表到实体类自动生成的工具类，但其实这个方式行不通，java的反射机制虽然强大,但也没办法无中生有。于是在网上搜了下，发现已经有前辈写过这类工具类，使用的是io流，直接创建.java文件 具体的代码如下希望不足之处可以得到大家的提点
首先是处理字符串的工具类：
import java.io.PrintWriter;
import com.cxb.myexception.IllegalException;
/**
* 字符串处理
* @author MrChen
*
*/
public class StringUtil {
/**
* 将set方法写入流中
* @param writer 目标流
* @param columnName 数据库字段名
* @param type 数据类型 java类型
* @throws IllegalException
*/
public static void gainSetMethod(PrintWriter writer,String columnName,String type)throws IllegalException{
String beanName=StringUtil.gainBeanString(columnName);
char[] ch = beanName.toCharArray();
if (ch[0] >= 'a' && ch[0] <= 'z') {
ch[0] = (char) (ch[0] - 32);
}
writer.println("\tpublic void set"+new String(ch)+"("+type+" "+beanName+"){");
writer.println("\t\t this."+beanName+"="+beanName+";\n\t}");
}
/**
* 将get方法写入流中
* @param writer 目标流
* @param columnName 数据库字段名
* @param type 数据类型 java类型
* @throws IllegalException
*/
public static void gainGetMethod(PrintWriter writer,String columnName,String type)throws IllegalException{
String beanName=StringUtil.gainBeanString(columnName);
char[] ch = beanName.toCharArray();
if (ch[0] >= 'a' && ch[0] <= 'z') {
ch[0] = (char) (ch[0] - 32);
}
writer.println("\tpublic "+type+" get"+new String(ch)+"(){");
writer.println("\t\treturn this."+beanName+";\n\t}");
}
/**
* 根据_将表名转为首字母大写的ClassName
* @param tableName 表名 WORD_WORD or T_WORD_WORD
* @return
* @throws IllegalException
*/
public static String gainClassNameString(String tableName) throws IllegalException{
return StringUtil.gainBeanString(tableName, "_", 1);
}
/**
* 根据_将数据库字段转为驼峰法的Bean字段
* @param columnName 数据库字段 WORD_WORD or T_WORD_WORD
* @return
* @throws IllegalException
*/
public static String gainBeanString(String columnName)throws IllegalException{
return StringUtil.gainBeanString(columnName, "_", 0);
}
/**
* 根据正则表达式分离字段并拼接为驼峰法命名的Bean字段或首字母大写的className字段
* @param tableString
* @param regex
* @param type 0-BeanName !0-ClassName
* @return
* throws IllegalException
*/
public static String gainBeanString(String tableString,String regex,int type)throws IllegalException{
try{
if(tableString==null||"".equals(tableString)){
throw new IllegalException("字符不能为null");
}
String[] words=tableString.split(regex);//根据下划线讲字段分离
if(words.length<=0){
throw new IllegalException("非法数据库命名");
}
if(words.length==1){
if(type==0){
return words[0].toLowerCase();
}else{
return StringUtil.initialString(words[0]);
}
}
StringBuilder targetStr=new StringBuilder();
//拼接首个字段
int firstInt=0;
if(words[0].equalsIgnoreCase("T"))
firstInt=1;
if(type==0){
targetStr.append(words[firstInt].toLowerCase());
}else{
targetStr.append(StringUtil.initialString(words[firstInt]));
}
//拼接其余字段
for (int i = firstInt+1; i < words.length; i++) {
targetStr.append(StringUtil.initialString(words[i]));
}
return targetStr.toString();
}catch(IllegalException e){
e.printStackTrace();
throw new IllegalException("非法字符："+tableString);
}
}
/**
* 返回一个首字母大写的字符串
* @param str
* @return
*/
public static String initialString(String str)throws IllegalException{
try{
str=str.toLowerCase();
char[] ch = str.toCharArray();
if (ch[0] >= 'a' && ch[0] <= 'z') {
ch[0] = (char) (ch[0] - 32);
}
return new String(ch);
}catch(Exception e){
e.printStackTrace();
throw new IllegalException("字符首字母转换异常:"+str);
}
}
}
----------------------------------------------------------生成Bean工具类---------------------------------------------------
package com.cxb.util;
import java.io.File;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.Date;
import javax.annotation.Resource;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.transform.Transformers;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
/**
* 根据数据库表自动生成Bean
* @author MrChen
*
*/
@Transactional
@Component(value="createBean")
public class CreateBean {
@Resource(name = "sessionFactory")
private SessionFactory sessionFactory;
private String packagePath="\\src\\main\\java\\com\\cxb\\model";//生成的包路径
/**
* @param userName 数据库用户名
* @param packageStr 生成的Bean所在目录
* @return
*/
public int createBean(String userName,String packageStr){
try{
String directory=System.getProperty("user.dir");
directory+="\\src\\main\\java\\"+packageStr;
directory=directory.toLowerCase();
System.out.println(directory);
//生成路径
new File(directory).mkdirs();
//获取所有表名
StringBuilder sql=new StringBuilder();
sql.append("select table_name from user_tables t");
if(userName!=null){
sql.append(" where t.TABLESPACE_NAME='");
sql.append(userName.toUpperCase());
sql.append("'");
}
System.out.println(sql);
//获取当前用户下的所有表名
List
int tableSize=0;
System.out.println("当期共获取表名："+tableName.size());
for (String string : tableName) {
try{
//排除工作流表
if(string.toUpperCase().startsWith("ACT"))
continue;
List
//创建.java文件
String tempUrl=directory+"\\"+StringUtil.gainClassNameString(string)+".java";
File file=new File(tempUrl);
file.createNewFile();
PrintWriter write=new PrintWriter(file,"UTF-8");
//写入所属空间
write.println("package\t"+packageStr.toLowerCase().replaceAll("\\\\", ".")+";");
//导入包
write.println("import\tjavax.persistence.Column;");
write.println("import\tjavax.persistence.Entity;");
write.println("import\tjavax.persistence.GeneratedValue;");
write.println("import\tjavax.persistence.GenerationType;");
write.println("import\tjavax.persistence.Id;");
write.println("import\tjavax.persistence.SequenceGenerator;");
write.println("import\tjavax.persistence.Table;");
write.println("import\tjava.util.Date;");
//写入类及类主键
write.println("@Entity\n@Table(name=\""+string+"\")\npublic class "+StringUtil.gainClassNameString(string)+"{\n");
//写入主键
write.println("\tprivate Integer "+StringUtil.gainBeanString((String)temp.get(0).get("COLUMN_NAME"))+";");
//写入get&set方法
write.println("\t@Id");
if(temp.get(0).get("NULLABLE").equals("N")){
write.println("\t@SequenceGenerator(name=\"seq_generator\",sequenceName=\"table_id\", allocationSize = 1)");
write.println("\t@GeneratedValue(generator=\"seq_generator\",strategy=GenerationType.SEQUENCE)");
}
write.println("\t@Column(name=\""+temp.get(0).get("COLUMN_NAME")+"\")");
StringUtil.gainGetMethod(write, (String)temp.get(0).get("COLUMN_NAME"), "Integer");
StringUtil.gainSetMethod(write, (String)temp.get(0).get("COLUMN_NAME"), "Integer");
//写入其他字段
for (int i = 1; i < temp.size(); i++) {
//获取数据类型
String type="";
switch((String)temp.get(i).get("DATA_TYPE")){
case "NUMBER":
case "Integer":
type="Integer";
break;
case "NVARCHAR2":
case "VARCHAR2":
case "VARCHAR":
type="String";
break;
case "TIMESTAMP(6)":
case "TIMESTAMP(3)":
case "DATE":
type="Date";
break;
default:
type="String";
break;
}
write.println("\tprivate "+type+" "+StringUtil.gainBeanString((String)temp.get(i).get("COLUMN_NAME"))+";");
write.println("\t@Column(name=\""+temp.get(i).get("COLUMN_NAME")+"\")");
StringUtil.gainGetMethod(write, (String)temp.get(i).get("COLUMN_NAME"), type);
StringUtil.gainSetMethod(write, (String)temp.get(i).get("COLUMN_NAME"), type);
}
write.print("}");
write.flush();
}catch(Exception e){
System.err.println(string+"表创建Bean失败"+(++tableSize));
}
}
}catch(Exception e){
e.printStackTrace();
}
return 0;
}
/**
* 构建get/set方法
*/
public void createSetAndGet(PrintWriter writer,String FieldName){
}
/**
* 获取表结构
* @return
*/
public List
return getSession().createSQLQuery("select COLUMN_NAME,DATA_TYPE,NULLABLE from user_tab_columns where Table_Name='"+tableName+"'").setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP).list();
}
public Session getSession() {
return this.sessionFactory.getCurrentSession();
// .getCurrentSession();
}
public SessionFactory getSessionFactory() {
return sessionFactory;
}
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
}