手撸一个代码自动生成器！！
实现功能：MyBatis 逆向工程
技术架构
页面是用 Vue ，element-ui开发；网络请求是 Axios。
服务端是 Spring Boot
页面模版是 Freemarker：
开发步骤：
一、创建工程
二、数据库连接操作
1.所需包结构
2.在model包中创建Db类
作用：用于接受前端传来数据库连接相关的值(username，password,url)
package com.example.generate_code.model;
/**
* @author: 王泽
*/
public class Db {
private String username;
private String password;
private String url;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
3.在model中创建RespBean类
自定义响应类，返回数据更方便
package com.example.generate_code.model;
/**
* @author: 王泽
*/
public class RespBean {
private Integer status;
private String msg;
private Object obj;
public static RespBean ok(String msg,Object obj) {
return new RespBean(200, msg, obj);
}
public static RespBean ok(String msg) {
return new RespBean(200, msg, null);
}
public static RespBean error(String msg,Object obj) {
return new RespBean(500, msg, obj);
}
public static RespBean error(String msg) {
return new RespBean(500, msg, null);
}
private RespBean() {
}
private RespBean(Integer status, String msg, Object obj) {
this.status = status;
this.msg = msg;
this.obj = obj;
}
public Integer getStatus() {
return status;
}
public void setStatus(Integer status) {
this.status = status;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getObj() {
return obj;
}
public void setObj(Object obj) {
this.obj = obj;
}
}
4.在Utils中创建DBUtils
JDBC连接工具类
public class DbUtils {
private static Connection connection;
public static Connection getConnection() {
return connection;
}
public static Connection initDb(Db db) {
if (connection == null) {
try {
Class.forName("com.mysql.cj.jdbc.Driver");
connection = DriverManager.getConnection(db.getUrl(), db.getUsername(), db.getPassword());
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
}
}
return connection;
}
}
5.写一个连接接口DbController
连接数据库
@RestController
public class DbController {
@PostMapping("/connect")
public RespBean connect(@RequestBody Db db) {
Connection con = DBUtils.initDb(db);
if (con != null) {
return RespBean.ok("数据库连接成功");
}
return RespBean.error("数据库连接失败");
}
}
6.创建index页面
代码生成工具
数据库用户名：
数据库密码：
数据库连接地址：
jdbc:mysql://
?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
连接数据库
[{{msg}}]
配置
三、加载数据表信息
1.服务器端编写
ColumnClass 用来描述表中的每一列
package com.example.generate_code.model;
/**
* @author: 王泽
*/
public class ColumnClass {
private String propertyName; //对应java属性的名字
private String columnName; //数据库中的名字
private String type; //字段类型
private String remark; //备注
private Boolean isPrimary; //字段是不是一个主键
@Override
public String toString() {
return "ColumnClass{" +
"propertyName='" + propertyName + '\'' +
", columnName='" + columnName + '\'' +
", type='" + type + '\'' +
", remark='" + remark + '\'' +
", isPrimary=" + isPrimary +
'}';
}
public String getPropertyName() {
return propertyName;
}
public void setPropertyName(String propertyName) {
this.propertyName = propertyName;
}
public String getColumnName() {
return columnName;
}
public void setColumnName(String columnName) {
this.columnName = columnName;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
public Boolean getPrimary() {
return isPrimary;
}
public void setPrimary(Boolean primary) {
isPrimary = primary;
}
}
描述一个具体的表的信息 TableClass
package com.example.generate_code.model;
import java.util.List;
/**
* @author: 王泽
*/
public class TableClass {
private String tableName; //表名 ，以下是生成的名字
private String modelName;
private String serviceName;
private String mapperName;
private String controllerName;
private String packageName;
private List columns; // 字段
@Override
public String toString() {
return "TableClass{" +
"tableName='" + tableName + '\'' +
", modelName='" + modelName + '\'' +
", serviceName='" + serviceName + '\'' +
", mapperName='" + mapperName + '\'' +
", controllerName='" + controllerName + '\'' +
", packageName='" + packageName + '\'' +
", columns=" + columns +
'}';
}
public String getTableName() {
return tableName;
}
public void setTableName(String tableName) {
this.tableName = tableName;
}
public String getModelName() {
return modelName;
}
public void setModelName(String modelName) {
this.modelName = modelName;
}
public String getServiceName() {
return serviceName;
}
public void setServiceName(String serviceName) {
this.serviceName = serviceName;
}
public String getMapperName() {
return mapperName;
}
public void setMapperName(String mapperName) {
this.mapperName = mapperName;
}
public String getControllerName() {
return controllerName;
}
public void setControllerName(String controllerName) {
this.controllerName = controllerName;
}
public String getPackageName() {
return packageName;
}
public void setPackageName(String packageName) {
this.packageName = packageName;
}
public List getColumns() {
return columns;
}
public void setColumns(List columns) {
this.columns = columns;
}
}
创建配置接口Controller
用map来接受前端传来的数据
用到了谷歌提供的工具包guava，需要导入依赖
@PostMapping("/config")
public RespBean config(@RequestBody Map map) {
String packageName = map.get("packageName");
try {
Connection connection = DBUtils.getConnection();
DatabaseMetaData metaData = connection.getMetaData();
ResultSet tables = metaData.getTables(connection.getCatalog(), null, null, null);
List tableClassList = new ArrayList<>();
while (tables.next()) {
TableClass tableClass = new TableClass();
tableClass.setPackageName(packageName);
String table_name = tables.getString("TABLE_NAME");
String modelName = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, table_name);
tableClass.setTableName(table_name);
tableClass.setModelName(modelName);
tableClass.setControllerName(modelName + "Controller");
tableClass.setMapperName(modelName + "Mapper");
tableClass.setServiceName(modelName+"Service");
tableClassList.add(tableClass);
}
return RespBean.ok("数据库信息读取成功", tableClassList);
} catch (Exception e) {
e.printStackTrace();
}
return RespBean.error("数据库信息读取失败");
}
com.google.guava guava 30.1-jre
2.完善index页面
代码生成工具
数据库用户名：
数据库密码：
数据库连接地址：
jdbc:mysql://
?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
连接数据库
[{{msg}}]
配置
生成代码
*{{result}}*
{{codePath}}
四、代码生成
1.创建模板 Model.java.ftl
package ${packageName}.model;
import java.util.Date;
public class ${modelName}{
<#if columns??>
<#list columns as column>
<#if column.type='VARCHAR'||column.type='TEXT'||column.type='CHAR'>
/**
* ${column.remark}
*/
private String ${column.propertyName?uncap_first};
<#if column.type='INT'>
/**
* ${column.remark}
*/
private Integer ${column.propertyName?uncap_first};
<#if column.type='DATETIME'>
/**
* ${column.remark}
*/
private Date ${column.propertyName?uncap_first};
<#if column.type='BIGINT'>
/**
* ${column.remark}
*/
private Long ${column.propertyName?uncap_first};
<#if column.type='DOUBLE'>
/**
* ${column.remark}
*/
private Double ${column.propertyName?uncap_first};
<#if column.type='BIT'>
/**
* ${column.remark}
*/
private Boolean ${column.propertyName?uncap_first};
<#if columns??>
<#list columns as column>
<#if column.type='VARCHAR'||column.type='TEXT'||column.type='CHAR'>
public String get${column.propertyName}(){
return ${column.propertyName?uncap_first};
}
public void set${column.propertyName}(String ${column.propertyName?uncap_first}){
this.${column.propertyName?uncap_first}=${column.propertyName?uncap_first};
}
<#if column.type='INT'>
public Integer get${column.propertyName}(){
return ${column.propertyName?uncap_first};
}
public void set${column.propertyName}(Integer ${column.propertyName?uncap_first}){
this.${column.propertyName?uncap_first}=${column.propertyName?uncap_first};
}
<#if column.type='DATETIME'>
public Date get${column.propertyName}(){
return ${column.propertyName?uncap_first};
}
public void set${column.propertyName}(Date ${column.propertyName?uncap_first}){
this.${column.propertyName?uncap_first}=${column.propertyName?uncap_first};
}
<#if column.type='BIGINT'>
public Long get${column.propertyName}(){
return ${column.propertyName?uncap_first};
}
public void set${column.propertyName}(Long ${column.propertyName?uncap_first}){
this.${column.propertyName?uncap_first}=${column.propertyName?uncap_first};
}
<#if column.type='DOUBLE'>
public Double get${column.propertyName}(){
return ${column.propertyName?uncap_first};
}
public void set${column.propertyName}(Double ${column.propertyName?uncap_first}){
this.${column.propertyName?uncap_first}=${column.propertyName?uncap_first};
}
<#if column.type='BIT'>
public Boolean get${column.propertyName}(){
return ${column.propertyName?uncap_first};
}
public void set${column.propertyName}(Boolean ${column.propertyName?uncap_first}){
this.${column.propertyName?uncap_first}=${column.propertyName?uncap_first};
}
}
Service.java.ftl
package ${packageName}.service;
import ${packageName}.model.${modelName};
import ${packageName}.mapper.${mapperName};
import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.Autowired;
import java.util.List;
@Service
public class ${serviceName}{
@Autowired
${mapperName} ${mapperName?uncap_first};
public List<${modelName}> getAll${modelName}s(){
return ${mapperName?uncap_first}.getAll${modelName}s();
}
}
Controller.java.ftl
package ${packageName}.controller;
import ${packageName}.model.${modelName};
import ${packageName}.service.${serviceName};
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.GetMapping;
import java.util.List;
@RestController
public class ${controllerName}{
@Autowired
${serviceName} ${serviceName?uncap_first};
@GetMapping("/${modelName?lower_case}s")
public List<${modelName}> getAll${modelName}s(){
return ${serviceName?uncap_first}.getAll${modelName}s();
}
}
Mapper.java.ftl
package ${packageName}.mapper;
import ${packageName}.model.${modelName};
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface ${mapperName}{
List<${modelName}> getAll${modelName}s();
}
Mapper.xml.ftl
<#list columns as column> <<#if column.primary??>id<#else>result column="${column.columnName}" property="${column.propertyName?uncap_first}" jdbcType="<#if column.type='INT'>INTEGER<#elseif column.type='DATETIME'>TIMESTAMP<#elseif column.type='TEXT'>VARCHAR<#else>${column.type}" />
2.代码生成Controller
package com.example.generate_code.controller;
import com.example.generate_code.model.RespBean;
import com.example.generate_code.model.TableClass;
import com.example.generate_code.service.GenerateCodeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
@RestController
public class GenerateCodeController {
@Autowired
GenerateCodeService generateCodeService;
@PostMapping("/generateCode")
public RespBean generateCode(@RequestBody List tableClassList, HttpServletRequest req) {
return generateCodeService.generateCode(tableClassList, req.getServletContext().getRealPath("/"));
}
}
3.编写service
package com.example.generate_code.service;
import com.example.generate_code.model.ColumnClass;
import com.example.generate_code.model.RespBean;
import com.example.generate_code.model.TableClass;
import com.example.generate_code.utils.DBUtils;
import com.google.common.base.CaseFormat;
import freemarker.cache.ClassTemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import org.springframework.stereotype.Service;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
@Service
public class GenerateCodeService {
Configuration cfg = null;
{
cfg = new Configuration(Configuration.VERSION_2_3_30);
cfg.setTemplateLoader(new ClassTemplateLoader(GenerateCodeService.class, "/templates"));
cfg.setDefaultEncoding("UTF-8");
}
public RespBean generateCode(List tableClassList, String realPath) {
try {
Template modelTemplate = cfg.getTemplate("Model.java.ftl");
Template mapperJavaTemplate = cfg.getTemplate("Mapper.java.ftl");
Template mapperXmlTemplate = cfg.getTemplate("Mapper.xml.ftl");
Template serviceTemplate = cfg.getTemplate("Service.java.ftl");
Template controllerTemplate = cfg.getTemplate("Controller.java.ftl");
Connection connection = DBUtils.getConnection();
DatabaseMetaData metaData = connection.getMetaData();
for (TableClass tableClass : tableClassList) {
ResultSet columns = metaData.getColumns(connection.getCatalog(), null, tableClass.getTableName(), null);
ResultSet primaryKeys = metaData.getPrimaryKeys(connection.getCatalog(), null, tableClass.getTableName());
List columnClassList = new ArrayList<>();
while (columns.next()) {
String column_name = columns.getString("COLUMN_NAME");
String type_name = columns.getString("TYPE_NAME");
String remarks = columns.getString("REMARKS");
ColumnClass columnClass = new ColumnClass();
columnClass.setRemark(remarks);
columnClass.setColumnName(column_name);
columnClass.setType(type_name);
columnClass.setPropertyName(CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, column_name));
primaryKeys.first();
while (primaryKeys.next()) {
String pkName = primaryKeys.getString("COLUMN_NAME");
if (column_name.equals(pkName)) {
columnClass.setPrimary(true);
}
}
columnClassList.add(columnClass);
}
tableClass.setColumns(columnClassList);
String path = realPath + "/" + tableClass.getPackageName().replace(".", "/");
generate(modelTemplate, tableClass, path + "/model/");
generate(mapperJavaTemplate, tableClass, path + "/mapper/");
generate(mapperXmlTemplate, tableClass, path + "/mapper/");
generate(serviceTemplate, tableClass, path + "/service/");
generate(controllerTemplate, tableClass, path + "/controller/");
}
return RespBean.ok("代码已生成", realPath);
} catch (Exception e) {
e.printStackTrace();
}
return RespBean.error("代码生成失败");
}
private void generate(Template template, TableClass tableClass, String path) throws IOException, TemplateException {
File folder = new File(path);
if (!folder.exists()) {
folder.mkdirs();
}
String fileName = path + "/" + tableClass.getModelName() + template.getName().replace(".ftl", "").replace("Model", "");
FileOutputStream fos = new FileOutputStream(fileName);
OutputStreamWriter out = new OutputStreamWriter(fos);
template.process(tableClass,out);
fos.close();
out.close();
}
}
五、测试
这时候已经找到了，我们来验证一下效果！
修改写配置
spring.datasource.name=root spring.datasource.password=123456 spring.datasource.url=jdbc:mysql://localhost:3306/boot_crm?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
pom.xml
src/main/java **/*.xml src/main/resources
导入生成的代码
运行测试
一个基本的mybatis逆向工程就完成了!
最后附上项目源代码:Gitee
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