自動生成實體類以及mybatis配置文件

 先在數據庫中設計表，而後使用下面工具生成實體類和mapper，配置可根據需求自行更改

package com.xgh.educmbs.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.HashMap;
import java.util.List;
import java.util.Map;


public class EntityUtil {

    /**
     **********************************使用前必讀*******************
     **
     ** 使用前請將moduleName更改成本身模塊的名稱便可（通常狀況下與數據庫名一致），其餘無須改動。
     **
     ***********************************************************
     */

    private final String type_char = "char";

    private final String type_date = "date";

    private final String type_timestamp = "timestamp";

    private final String type_int = "int";

    private final String type_bigint = "bigint";

    private final String type_text = "text";

    private final String type_bit = "bit";

    private final String type_decimal = "decimal";

    private final String type_blob = "blob";


    private final String moduleName = "xghtestdb"; // 對應模塊名稱（根據本身模塊作相應調整!!!務必修改^_^）

    private final String bean_path = "d:/entity_bean";

    private final String mapper_path = "d:/entity_mapper";

    private final String xml_path = "d:/entity_mapper/xml";

    private final String bean_package = "com.yunxiaoyuan." + moduleName + ".entity";

    private final String mapper_package = "com.yunxiaoyuan." + moduleName + ".mapper";


    private final String driverName = "com.mysql.jdbc.Driver";

    private final String user = "root";

    private final String password = "root";

    private final String url = "jdbc:mysql://192.168.3.86:3306/" + moduleName + "?characterEncoding=utf8";

    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);
    }


    /**
     *  獲取全部的表
     *
     * @return
     * @throws SQLException
     */
    private List<String> getTables() throws SQLException {
        List<String> tables = new ArrayList<String>();
        PreparedStatement pstate = conn.prepareStatement("show tables");
        ResultSet results = pstate.executeQuery();
        while ( results.next() ) {
            String tableName = results.getString(1);
            //          if ( tableName.toLowerCase().startsWith("yy_") ) {
            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;
        for ( int i = 1 ; i < tables.length ; i++ ) {
            temp = tables[i].trim();
            sb.append(temp.substring(0, 1).toUpperCase()).append(temp.substring(1));
        }
        beanName = sb.toString();
        mapperName = beanName + "Mapper";
    }


    private String processType( String type ) {
        if ( type.indexOf(type_char) > -1 ) {
            return "String";
        } else if ( type.indexOf(type_bigint) > -1 ) {
            return "Long";
        } else if ( type.indexOf(type_int) > -1 ) {
            return "Integer";
        } else if ( type.indexOf(type_date) > -1 ) {
            return "java.util.Date";
        } else if ( type.indexOf(type_text) > -1 ) {
            return "String";
        } else if ( type.indexOf(type_timestamp) > -1 ) {
            return "java.util.Date";
        } else if ( type.indexOf(type_bit) > -1 ) {
            return "Boolean";
        } else if ( type.indexOf(type_decimal) > -1 ) {
            return "java.math.BigDecimal";
        } else if ( type.indexOf(type_blob) > -1 ) {
            return "byte[]";
        }
        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]);
        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();
    }


    /**
     *  將實體類名首字母改成小寫
     *
     * @param beanName
     * @return
     */
    private String processResultMapId( String beanName ) {
        return beanName.substring(0, 1).toLowerCase() + beanName.substring(1);
    }


    /**
     *  構建類上面的註釋
     *
     * @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;
    }


    /**
     *  構建方法上面的註釋
     *
     * @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;
    }


    /**
     *  生成實體類
     *
     * @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();
    }


    /**
     *  構建Mapper文件
     *
     * @throws IOException
     */
    private void buildMapper() 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 = buildClassComment(bw, mapperName + "數據庫操做接口類");
        bw.newLine();
        bw.newLine();
        //      bw.write("public interface " + mapperName + " extends " + mapper_extends + "<" + beanName + "> {");
        bw.write("public interface " + mapperName + "{");
        bw.newLine();
        bw.newLine();
        // ----------定義Mapper中的方法Begin----------
        bw = buildMethodComment(bw, "查詢（根據主鍵ID查詢）");
        bw.newLine();
        bw.write("\t" + beanName + "  selectByPrimaryKey ( @Param(\"id\") Long id );");
        bw.newLine();
        bw = buildMethodComment(bw, "刪除（根據主鍵ID刪除）");
        bw.newLine();
        bw.write("\t" + "int deleteByPrimaryKey ( @Param(\"id\") Long id );");
        bw.newLine();
        bw = buildMethodComment(bw, "添加");
        bw.newLine();
        bw.write("\t" + "int insert( " + beanName + " record );");
        bw.newLine();
        bw = buildMethodComment(bw, "添加 （匹配有值的字段）");
        bw.newLine();
        bw.write("\t" + "int insertSelective( " + beanName + " record );");
        bw.newLine();
        bw = buildMethodComment(bw, "修改 （匹配有值的字段）");
        bw.newLine();
        bw.write("\t" + "int updateByPrimaryKeySelective( " + beanName + " record );");
        bw.newLine();
        bw = buildMethodComment(bw, "修改（根據主鍵ID修改）");
        bw.newLine();
        bw.write("\t" + "int updateByPrimaryKey ( " + beanName + " record );");
        bw.newLine();

        // ----------定義Mapper中的方法End----------
        bw.newLine();
        bw.write("}");
        bw.flush();
        bw.close();
    }


    /**
     *  構建實體類映射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, mapperName + ".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();

        bw.write("\t<!--實體映射-->");
        bw.newLine();
        bw.write("\t<resultMap id=\"" + this.processResultMapId(beanName) + "ResultMap\" type=\"" + beanName + "\">");
        bw.newLine();
        bw.write("\t\t<!--" + comments.get(0) + "-->");
        bw.newLine();
        bw.write("\t\t<id property=\"" + this.processField(columns.get(0)) + "\" column=\"" + columns.get(0) + "\" />");
        bw.newLine();
        int size = columns.size();
        for ( int i = 1 ; i < size ; i++ ) {
            bw.write("\t\t<!--" + comments.get(i) + "-->");
            bw.newLine();
            bw.write("\t\t<result property=\""
                    + this.processField(columns.get(i)) + "\" column=\"" + columns.get(i) + "\" />");
            bw.newLine();
        }
        bw.write("\t</resultMap>");

        bw.newLine();
        bw.newLine();
        bw.newLine();

        // 下面開始寫SqlMapper中的方法
        // this.outputSqlMapperMethod(bw, columns, types);
        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();
        // 通用結果列
        bw.write("\t<!-- 通用查詢結果列-->");
        bw.newLine();
        bw.write("\t<sql id=\"Base_Column_List\">");
        bw.newLine();

        bw.write("\t\t id,");
        for ( int i = 1 ; 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();


        // 查詢（根據主鍵ID查詢）
        bw.write("\t<!-- 查詢（根據主鍵ID查詢） -->");
        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();
        // 查詢完


        // 刪除（根據主鍵ID刪除）
        bw.write("\t<!--刪除：根據主鍵ID刪除-->");
        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();
        // 刪除完


        // 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();
        //---------------  完畢


        // 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方法完畢

        // ----- 修改（匹配有值的字段）
        bw.write("\t<!-- 修 改-->");
        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();
    }


    /**
     *  獲取全部的數據庫表註釋
     *
     * @return
     * @throws SQLException
     */
    private Map<String, String> getTableComment() throws SQLException {
        Map<String, String> maps = new HashMap<String, String>();
        PreparedStatement pstate = conn.prepareStatement("show table status");
        ResultSet results = pstate.executeQuery();
        while ( results.next() ) {
            String tableName = results.getString("NAME");
            String comment = results.getString("COMMENT");
            maps.put(tableName, comment);
        }
        return maps;
    }


    public void generate() throws ClassNotFoundException, SQLException, IOException {
        init();
        String prefix = "show full fields from ";
        List<String> columns = null;
        List<String> types = null;
        List<String> comments = null;
        PreparedStatement pstate = null;
        List<String> tables = getTables();
        Map<String, String> tableComments = getTableComment();
        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("FIELD"));
                types.add(results.getString("TYPE"));
                comments.add(results.getString("COMMENT"));
            }
            tableName = table;
            processTable(table);
            //          this.outputBaseBean();
            String tableComment = tableComments.get(tableName);
            buildEntityBean(columns, types, comments, tableComment);
            buildMapper();
            buildMapperXml(columns, types, comments);
        }
        conn.close();
    }


    public static void main( String[] args ) {
        try {
            new EntityUtil().generate();
            // 自動打開生成文件的目錄
            Runtime.getRuntime().exec("cmd /c start explorer D:\\");
        } catch ( ClassNotFoundException e ) {
            e.printStackTrace();
        } catch ( SQLException e ) {
            e.printStackTrace();
        } catch ( IOException e ) {
            e.printStackTrace();
        }
    }















}