沫沫金-Mybatis工具类，生成dao层xml、mapper文件和实体类entity层
Mybatis Generator工具使用起来，总感觉不太灵活加上初次环境配置麻烦，特编写java文件 单文件不依赖，直接生成。源码如下（此为Oracle数据库版）
package net.icarefx.booking.util; import java.io.BufferedWriter; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import org.apache.commons.lang.StringUtils; /** * 代码生成MyBatis的实体类、dao层下实体映射(sqlmap)XML文件和Mapper类 * @author 沫沫金 * @email [email protected] * @WeiXin zl4828 */ public class MybatisGenerator { /** **********************************使用前必读******************* ** ** 使用前请将moduleName更改为自己数据库表名，全库生成请留空。这是Oracle版本 ** *********************************************************** */ private final String type_str = "VARCHAR2"; private final String type_date = "DATE"; private final String type_decimal = "NUMBER"; private final String moduleName = "ORDERWEB_BED_REC"; // 表名称（所有请留空，指定表名只生成单表mapper等） private static String fileName = "MybatisGenerator"; // 生成文件存储根目录文件夹名 private final static String BASE_PATH = "D:/"+fileName+"/"; private final static String OPEN_PATH = "D:\\"+fileName; private final String bean_path = BASE_PATH + "entity"; private final String mapper_path = BASE_PATH + "dao"; private final String xml_path = BASE_PATH + "dao/sqlmap"; private final String bean_package = "net.icarefx.booking.pojo"; private final String mapper_package = "net.icarefx.booking.dao"; /** * 数据库配置 */ private final String driverName = "oracle.jdbc.driver.OracleDriver"; private final String url = "jdbc:oracle:thin:@127.0.0.1:1521:orcl"; private final String user = "orderweb"; private final String password = "carefx"; private String tableName = null; private String beanName = null; private String mapperName = null; private Connection conn = null; private void init() throws ClassNotFoundException, SQLException { Class.forName(driverName); conn = DriverManager.getConnection(url, user, password); } /** * 获取所有的表 * * @return * @throws SQLException */ private List<String> getTables() throws SQLException { List<String> tables = new ArrayList<String>(); PreparedStatement pstate = null; if(StringUtils.isNotBlank(moduleName)){ pstate = conn.prepareStatement("select table_name from user_tables where table_name ='"+moduleName+"'"); }else{ pstate = conn.prepareStatement("select table_name from user_tables"); } ResultSet results = pstate.executeQuery(); while ( results.next() ) { String tableName = results.getString(1); tables.add(tableName); } return tables; } private void processTable( String table ) { StringBuffer sb = new StringBuffer(table.length()); String tableNew = table.toLowerCase(); String[] tables = tableNew.split("_"); String temp = null; if(tables.length>1){ for ( int i = 0 ; i < tables.length ; i++ ) { temp = tables[i].trim(); sb.append(temp.substring(0, 1).toUpperCase()).append(temp.substring(1)); } }else{ sb.append(tableNew.substring(0, 1).toUpperCase()).append(tableNew.substring(1)); } beanName = sb.toString(); mapperName = beanName + "Mapper"; } private String processType( String type ) { if ( type.indexOf(type_str) > -1 ) { return "String"; }else if ( type.indexOf(type_date) > -1 ) { return "java.util.Date"; }else if ( type.indexOf(type_decimal) > -1 ) { return "java.math.BigDecimal"; } return null; } private String processField( String field ) { StringBuffer sb = new StringBuffer(field.length()); field = field.toLowerCase(); String[] fields = field.split("_"); String temp = null; sb.append(fields[0]); if(fields.length>1){ for ( int i = 1 ; i < fields.length ; i++ ) { temp = fields[i].trim(); sb.append(temp.substring(0, 1).toUpperCase()).append(temp.substring(1)); } } return sb.toString(); } /** * 将实体类名首字母改为小写 * * @param beanName * @return */ private String processResultMapId( String beanName ) { return beanName.substring(0, 1).toLowerCase() + beanName.substring(1); } /** * 构建类上面的注释 * * @param bw * @param text * @return * @throws IOException */ private BufferedWriter buildClassComment( BufferedWriter bw, String text ) throws IOException { bw.newLine(); bw.newLine(); bw.write("/**"); bw.newLine(); bw.write(" * "); bw.newLine(); bw.write(" * " + text); bw.newLine(); bw.write(" * "); bw.newLine(); bw.write(" **/"); return bw; } /** * 构建方法上面的注释 * * @param bw * @param text * @return * @throws IOException */ private BufferedWriter buildMethodComment( BufferedWriter bw, String text ) throws IOException { bw.newLine(); bw.write("\t/**"); bw.newLine(); bw.write("\t * "); bw.newLine(); bw.write("\t * " + text); bw.newLine(); bw.write("\t * "); bw.newLine(); bw.write("\t **/"); return bw; } /** * 生成实体类 * * @param columns * @param types * @param comments * @throws IOException */ private void buildEntityBean( List<String> columns, List<String> types, List<String> comments, String tableComment ) throws IOException { File folder = new File(bean_path); if ( !folder.exists() ) { folder.mkdir(); } File beanFile = new File(bean_path, beanName + ".java"); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(beanFile))); bw.write("package " + bean_package + ";"); bw.newLine(); bw.write("import java.io.Serializable;"); bw.newLine(); //bw.write("import lombok.Data;"); // bw.write("import javax.persistence.Entity;"); bw = buildClassComment(bw, tableComment); bw.newLine(); bw.write("@SuppressWarnings(\"serial\")"); bw.newLine(); // bw.write("@Entity"); //bw.write("@Data"); //bw.newLine(); bw.write("public class " + beanName + " implements Serializable {"); bw.newLine(); bw.newLine(); int size = columns.size(); for ( int i = 0 ; i < size ; i++ ) { bw.write("\t/**" + comments.get(i) + "**/"); bw.newLine(); bw.write("\tprivate " + processType(types.get(i)) + " " + processField(columns.get(i)) + ";"); bw.newLine(); bw.newLine(); } bw.newLine(); // 生成get 和 set方法 String tempField = null; String _tempField = null; String tempType = null; for ( int i = 0 ; i < size ; i++ ) { tempType = processType(types.get(i)); _tempField = processField(columns.get(i)); tempField = _tempField.substring(0, 1).toUpperCase() + _tempField.substring(1); bw.newLine(); // bw.write("\tpublic void set" + tempField + "(" + tempType + " _" + _tempField + "){"); bw.write("\tpublic void set" + tempField + "(" + tempType + " " + _tempField + "){"); bw.newLine(); // bw.write("\t\tthis." + _tempField + "=_" + _tempField + ";"); bw.write("\t\tthis." + _tempField + " = " + _tempField + ";"); bw.newLine(); bw.write("\t}"); bw.newLine(); bw.newLine(); bw.write("\tpublic " + tempType + " get" + tempField + "(){"); bw.newLine(); bw.write("\t\treturn this." + _tempField + ";"); bw.newLine(); bw.write("\t}"); bw.newLine(); } bw.newLine(); bw.write("}"); bw.newLine(); bw.flush(); bw.close(); } /** * 构建Mapper文件 * * @throws IOException */ private void buildMapper(List<String> columns, List<String> types) throws IOException { File folder = new File(mapper_path); if ( !folder.exists() ) { folder.mkdirs(); } File mapperFile = new File(mapper_path, mapperName + ".java"); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(mapperFile), "utf-8")); bw.write("package " + mapper_package + ";"); bw.newLine(); bw.newLine(); bw.write("import " + bean_package + "." + beanName + ";"); bw.newLine(); bw.write("import org.apache.ibatis.annotations.Param;"); bw.newLine(); bw.write("import java.util.List;"); bw = buildClassComment(bw, mapperName + "数据库操作接口类"); bw.newLine(); bw.newLine(); // bw.write("public interface " + mapperName + " extends " + mapper_extends + "<" + beanName + "> {"); bw.write("public interface " + mapperName + "{"); bw.newLine(); bw.newLine(); // 主键名称 String pkName = processField(columns.get(0)); String pkType = processType(types.get(0)); // ----------定义Mapper中的方法Begin---------- bw = buildMethodComment(bw, "查询（根据主键ID查询）"); bw.newLine(); bw.write("\tpublic " + beanName + " selectByPrimaryKey ( @Param(\""+pkName+"\") "+pkType+" "+pkName+" );"); bw.newLine(); bw = buildMethodComment(bw, "删除（根据主键ID删除）"); bw.newLine(); bw.write("\tpublic " + "int deleteByPrimaryKey ( @Param(\""+pkName+"\") "+pkType+" "+pkName+" );"); bw.newLine(); bw = buildMethodComment(bw, "添加"); bw.newLine(); bw.write("\tpublic " + "int insert( " + beanName + " record );"); bw.newLine(); bw = buildMethodComment(bw, "添加 （匹配有值的字段）"); bw.newLine(); bw.write("\tpublic " + "int insertSelective( " + beanName + " record );"); bw.newLine(); bw = buildMethodComment(bw, "修改 （匹配有值的字段）"); bw.newLine(); bw.write("\tpublic " + "int updateByPrimaryKeySelective( " + beanName + " record );"); bw.newLine(); bw = buildMethodComment(bw, "修改（根据主键ID修改）"); bw.newLine(); bw.write("\tpublic " + "int updateByPrimaryKey ( " + beanName + " record );"); bw.newLine(); bw = buildMethodComment(bw, "集合（匹配有值的字段）"); bw.newLine(); bw.write("\tpublic List<" + beanName + "> findByList ( " + beanName + " record );"); bw.newLine(); // ----------定义Mapper中的方法End---------- bw.newLine(); bw.write("}"); bw.flush(); bw.close(); } /** * 构建实体类映射XML文件 * * @param columns * @param types * @param comments * @throws IOException */ private void buildMapperXml( List<String> columns, List<String> types, List<String> comments ) throws IOException { File folder = new File(xml_path); if ( !folder.exists() ) { folder.mkdirs(); } File mapperXmlFile = new File(xml_path, beanName + ".sqlmap.xml"); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(mapperXmlFile))); bw.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); bw.newLine(); bw.write("<!DOCTYPE mapper PUBLIC \"-//mybatis.org//DTD Mapper 3.0//EN\" "); bw.newLine(); bw.write(" \"http://mybatis.org/dtd/mybatis-3-mapper.dtd\">"); bw.newLine(); bw.write("<mapper namespace=\"" + mapper_package + "." + mapperName + "\">"); bw.newLine(); bw.newLine(); buildSQL(bw, columns, types); bw.write("</mapper>"); bw.flush(); bw.close(); } private void buildSQL( BufferedWriter bw, List<String> columns, List<String> types ) throws IOException { int size = columns.size(); // 通用结果列 bw.write("\t<!-- 通用查询结果列-->"); bw.newLine(); bw.write("\t<sql id=\"Base_Column_List\">"); bw.newLine(); for ( int i = 0 ; i < size ; i++ ) { bw.write("\t" + columns.get(i)); if ( i != size - 1 ) { bw.write(","); } } bw.newLine(); bw.write("\t</sql>"); bw.newLine(); bw.newLine(); // 查询（根据主键ID查询） bw.write("\t<!-- 查询（根据主键ID查询） -->"); bw.newLine(); bw.write("\t<select id=\"selectByPrimaryKey\" resultType=\"" + processResultMapId(beanName) + "\" parameterType=\"java.lang." + processType(types.get(0)) + "\">"); bw.newLine(); bw.write("\t\t SELECT"); bw.newLine(); bw.write("\t\t <include refid=\"Base_Column_List\" />"); bw.newLine(); bw.write("\t\t FROM " + tableName); bw.newLine(); bw.write("\t\t WHERE " + columns.get(0) + " = #{" + processField(columns.get(0)) + "}"); bw.newLine(); bw.write("\t</select>"); bw.newLine(); bw.newLine(); // 查询完 // 删除（根据主键ID删除） bw.write("\t<!--删除：根据主键ID删除-->"); bw.newLine(); bw.write("\t<delete id=\"deleteByPrimaryKey\" parameterType=\"java.lang." + processType(types.get(0)) + "\">"); bw.newLine(); bw.write("\t\t DELETE FROM " + tableName); bw.newLine(); bw.write("\t\t WHERE " + columns.get(0) + " = #{" + processField(columns.get(0)) + "}"); bw.newLine(); bw.write("\t</delete>"); bw.newLine(); bw.newLine(); // 删除完 // 添加insert方法 bw.write("\t<!-- 添加 -->"); bw.newLine(); bw.write("\t<insert id=\"insert\" parameterType=\"" + processResultMapId(beanName) + "\">"); bw.newLine(); bw.write("\t\t INSERT INTO " + tableName); bw.newLine(); bw.write(" \t\t("); for ( int i = 0 ; i < size ; i++ ) { bw.write(columns.get(i)); if ( i != size - 1 ) { bw.write(","); } } bw.write(") "); bw.newLine(); bw.write("\t\t VALUES "); bw.newLine(); bw.write(" \t\t("); for ( int i = 0 ; i < size ; i++ ) { bw.write("#{" + processField(columns.get(i)) + "}"); if ( i != size - 1 ) { bw.write(","); } } bw.write(") "); bw.newLine(); bw.write("\t</insert>"); bw.newLine(); bw.newLine(); // 添加insert完 //--------------- insert方法（匹配有值的字段） bw.write("\t<!-- 添加 （匹配有值的字段）-->"); bw.newLine(); bw.write("\t<insert id=\"insertSelective\" parameterType=\"" + processResultMapId(beanName) + "\">"); bw.newLine(); bw.write("\t\t INSERT INTO " + tableName); bw.newLine(); bw.write("\t\t <trim prefix=\"(\" suffix=\")\" suffixOverrides=\",\" >"); bw.newLine(); String tempField = null; for ( int i = 0 ; i < size ; i++ ) { tempField = processField(columns.get(i)); bw.write("\t\t\t<if test=\"" + tempField + " != null\">"); bw.newLine(); bw.write("\t\t\t\t " + columns.get(i) + ","); bw.newLine(); bw.write("\t\t\t</if>"); bw.newLine(); } bw.newLine(); bw.write("\t\t </trim>"); bw.newLine(); bw.write("\t\t <trim prefix=\"values (\" suffix=\")\" suffixOverrides=\",\" >"); bw.newLine(); tempField = null; for ( int i = 0 ; i < size ; i++ ) { tempField = processField(columns.get(i)); bw.write("\t\t\t<if test=\"" + tempField + "!=null\">"); bw.newLine(); bw.write("\t\t\t\t #{" + tempField + "},"); bw.newLine(); bw.write("\t\t\t</if>"); bw.newLine(); } bw.write("\t\t </trim>"); bw.newLine(); bw.write("\t</insert>"); bw.newLine(); bw.newLine(); //--------------- 完毕 // 修改update方法 bw.write("\t<!-- 修 改-->"); bw.newLine(); bw.write("\t<update id=\"updateByPrimaryKeySelective\" parameterType=\"" + processResultMapId(beanName) + "\">"); bw.newLine(); bw.write("\t\t UPDATE " + tableName); bw.newLine(); bw.write(" \t\t <set> "); bw.newLine(); tempField = null; for ( int i = 1 ; i < size ; i++ ) { tempField = processField(columns.get(i)); bw.write("\t\t\t<if test=\"" + tempField + " != null\">"); bw.newLine(); bw.write("\t\t\t\t " + columns.get(i) + " = #{" + tempField + "},"); bw.newLine(); bw.write("\t\t\t</if>"); bw.newLine(); } bw.newLine(); bw.write(" \t\t </set>"); bw.newLine(); bw.write("\t\t WHERE " + columns.get(0) + " = #{" + processField(columns.get(0)) + "}"); bw.newLine(); bw.write("\t</update>"); bw.newLine(); bw.newLine(); // update方法完毕 // ----- 修改（匹配有值的字段） bw.write("\t<!-- 修 改（匹配有值的字段）-->"); bw.newLine(); bw.write("\t<update id=\"updateByPrimaryKey\" parameterType=\"" + processResultMapId(beanName) + "\">"); bw.newLine(); bw.write("\t\t UPDATE " + tableName); bw.newLine(); bw.write("\t\t SET "); bw.newLine(); tempField = null; for ( int i = 1 ; i < size ; i++ ) { tempField = processField(columns.get(i)); bw.write("\t\t\t " + columns.get(i) + " = #{" + tempField + "}"); if ( i != size - 1 ) { bw.write(","); } bw.newLine(); } bw.write("\t\t WHERE " + columns.get(0) + " = #{" + processField(columns.get(0)) + "}"); bw.newLine(); bw.write("\t</update>"); bw.newLine(); bw.newLine(); //--------------- 完毕 // ----- 集合（匹配有值的字段） bw.write("\t<!-- 集合（匹配有值的字段）-->"); bw.newLine(); bw.write("\t<select id=\"findByList\" resultType=\"" + processResultMapId(beanName) + "\" parameterType=\"" + processResultMapId(beanName) + "\">"); bw.newLine(); bw.write("\t\t SELECT"); bw.newLine(); bw.write("\t\t <include refid=\"Base_Column_List\" />"); bw.newLine(); bw.write("\t\t FROM " + tableName); bw.newLine(); bw.write(" \t\t <where> "); bw.newLine(); tempField = null; for ( int i = 0 ; i < size ; i++ ) { tempField = processField(columns.get(i)); bw.write("\t\t\t<if test=\"" + tempField + " != null\">"); bw.newLine(); bw.write("\t\t\t\t " + columns.get(i) + " = #{" + tempField + "},"); bw.newLine(); bw.write("\t\t\t</if>"); bw.newLine(); } bw.newLine(); bw.write(" \t\t </where>"); bw.newLine(); bw.write("\t</select>"); bw.newLine(); bw.newLine(); } public void generate() throws ClassNotFoundException, SQLException, IOException { init(); String prefix = "select column_name,data_type from user_tab_columns where table_name="; List<String> columns = null; List<String> types = null; List<String> comments = null; PreparedStatement pstate = null; List<String> tables = getTables(); for ( String table : tables ) { columns = new ArrayList<String>(); types = new ArrayList<String>(); comments = new ArrayList<String>(); pstate = conn.prepareStatement(prefix +"'"+ table +"'"); ResultSet results = pstate.executeQuery(); while ( results.next() ) { columns.add(results.getString("column_name")); types.add(results.getString("data_type")); comments.add(""); } tableName = table; processTable(table); buildEntityBean(columns, types, comments, "数据库表名称:"+tableName); buildMapper(columns, types); buildMapperXml(columns, types, comments); } conn.close(); } /** * 删除单个文件 * @param sPath 被删除文件的文件名 * @return 单个文件删除成功返回true，否则返回false */ public static boolean deleteFile(String sPath) { boolean flag = false; File file = new File(sPath); // 路径为文件且不为空则进行删除 if (file.isFile() && file.exists()) { file.delete(); flag = true; } return flag; } /** * 删除目录（文件夹）以及目录下的文件 * @param sPath 被删除目录的文件路径 * @return 目录删除成功返回true，否则返回false */ public static boolean deleteDirectory(String sPath) { //如果sPath不以文件分隔符结尾，自动添加文件分隔符 if (!sPath.endsWith(File.separator)) { sPath = sPath + File.separator; } File dirFile = new File(sPath); //如果dir对应的文件不存在，或者不是一个目录，则退出 if (!dirFile.exists() || !dirFile.isDirectory()) { return false; } boolean flag = true; //删除文件夹下的所有文件(包括子目录) File[] files = dirFile.listFiles(); for (int i = 0; i < files.length; i++) { //删除子文件 if (files[i].isFile()) { flag = deleteFile(files[i].getAbsolutePath()); if (!flag) break; } //删除子目录 else { flag = deleteDirectory(files[i].getAbsolutePath()); if (!flag) break; } } if (!flag) return false; //删除当前目录 if (dirFile.delete()) { return true; } else { return false; } } /** * 生成入口 * @param args */ public static void main( String[] args ) { try { // 自动打开生成文件的目录 File folder = new File(BASE_PATH); // 判断是否为文件 if (folder.isFile()) { // 为文件时调用删除文件方法 deleteFile(BASE_PATH); } else { // 为目录时调用删除目录方法 deleteDirectory(BASE_PATH); } folder.mkdir(); new MybatisGenerator().generate(); Runtime.getRuntime().exec("cmd /c start explorer "+OPEN_PATH); } catch ( ClassNotFoundException e ) { e.printStackTrace(); } catch ( SQLException e ) { e.printStackTrace(); } catch ( IOException e ) { e.printStackTrace(); } } }
更多版本：
1、MySql版本http://www.oschina.net/code/snippet_123050_45716
以上，自由复制，更灵活的生成。
作者：沫沫金，WX(zl4828)欢迎来骚.精通DIV+CSS+JS、PS淘宝美工、网页设计。+++
本文出自 “沫沫金的IT心得与技巧” 博客，谢绝转载！