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
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>代码生成工具</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<!-- 引入样式 -->
<link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
<!-- 引入组件库 -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
</head>
<body>
<div id="app">
<table>
<tr>
<td>
<el-tag size="mini">数据库用户名：</el-tag>
</td>
<td>
<el-input size="mini" v-model="db.username"></el-input>
</td>
</tr>
<tr>
<td>
<el-tag size="mini">数据库密码：</el-tag>
</td>
<td>
<el-input size="mini" v-model="db.password"></el-input>
</td>
</tr>
<tr>
<td>
<el-tag size="mini">数据库连接地址：</el-tag>
</td>
<td>
<el-input size="mini" v-model="db.url">
<template slot="prepend">jdbc:mysql://</template>
<template slot="append">
?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
</template>
</el-input>
</td>
</tr>
</table>
<div style="display: flex">
<el-button type="primary" size="mini" @click="connect" :disabled="!connectBtnEnabled">连接数据库</el-button>
<div style="color: #ff018d;font-weight: bold">[{
{msg}}]</div>
<el-input v-model="packageName" size="mini" style="width: 300px"></el-input>
<el-button type="primary" size="mini" @click="config">配置</el-button>
</div>
</div>
<script>
new Vue({
el: "#app",
data: function () {
return {
packageName: '',
msg: '数据库未连接',
connectBtnEnabled: true,
db: {
username: "root",
password: "123456",
url: "localhost:3306/"
}
}
},
methods: {
connect() {
let _this = this;
this.db.url = "jdbc:mysql://" + this.db.url + "?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai";
axios.post('/connect', this.db)
.then(function (response) {
_this.msg = response.data.msg;
_this.db = {
username: "root",
password: "123456",
url: "localhost:3306/"
}
_this.connectBtnEnabled = false;
})
.catch(function (error) {
console.log(error);
});
}
}
})
</script>
</body>
</html>
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<ColumnClass> 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<ColumnClass> getColumns() { return columns; } public void setColumns(List<ColumnClass> 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<String, String> 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<TableClass> 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"); }<dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>30.1-jre</version> </dependency>
2.完善index页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>代码生成工具</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<!-- 引入样式 -->
<link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
<!-- 引入组件库 -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
</head>
<body>
<div id="app">
<table>
<tr>
<td>
<el-tag size="mini">数据库用户名：</el-tag>
</td>
<td>
<el-input size="mini" v-model="db.username"></el-input>
</td>
</tr>
<tr>
<td>
<el-tag size="mini">数据库密码：</el-tag>
</td>
<td>
<el-input size="mini" v-model="db.password"></el-input>
</td>
</tr>
<tr>
<td>
<el-tag size="mini">数据库连接地址：</el-tag>
</td>
<td>
<el-input size="mini" v-model="db.url">
<template slot="prepend">jdbc:mysql://</template>
<template slot="append">
?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
</template>
</el-input>
</td>
</tr>
</table>
<div style="display: flex">
<el-button type="primary" size="mini" @click="connect" :disabled="!connectBtnEnabled">连接数据库</el-button>
<div style="color: #ff018d;font-weight: bold">[{
{msg}}]</div>
<el-input v-model="packageName" size="mini" style="width: 300px"></el-input>
<el-button type="primary" size="mini" @click="config">配置</el-button>
</div>
<el-table
:data="tableData"
stripe
border
style="width: 100%">
<el-table-column
prop="tableName"
label="表名称"
width="180">
</el-table-column>
<el-table-column
label="实体类名称"
width="180">
<template slot-scope="scope">
<el-input v-model="scope.row.modelName"></el-input>
</template>
</el-table-column>
<el-table-column
label="Mapper名称">
<template slot-scope="scope">
<el-input v-model="scope.row.mapperName"></el-input>
</template>
</el-table-column>
<el-table-column
label="Service名称">
<template slot-scope="scope">
<el-input v-model="scope.row.serviceName"></el-input>
</template>
</el-table-column>
<el-table-column
label="Controller名称">
<template slot-scope="scope">
<el-input v-model="scope.row.controllerName"></el-input>
</template>
</el-table-column>
</el-table>
<div>
<el-button @click="generateCode" type="success">生成代码</el-button>
<div style="color: #ff0114;font-weight: bold">*{
{result}}*</div>
<div>{
{codePath}}</div>
</div>
</div>
<script>
new Vue({
el: "#app",
data: function () {
return {
tableData: [],
packageName: 'com.wangze.test',
msg: '数据库未连接',
connectBtnEnabled: true,
db: {
username: "root",
password: "123456",
url: "localhost:3306/"
}
}
},
methods: {
generateCode() {
let _this = this;
axios.post('/generateCode', this.tableData)
.then(function (response) {
_this.result = response.data.msg;
_this.codePath = response.data.obj;
})
.catch(function (error) {
});
},
config() {
let _this = this;
axios.post('/config', {
packageName: this.packageName})
.then(function (response) {
_this.msg = response.data.msg;
_this.tableData = response.data.obj;
})
.catch(function (error) {
console.log(error);
});
},
connect() {
let _this = this;
this.db.url = "jdbc:mysql://" + this.db.url + "?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai";
axios.post('/connect', this.db)
.then(function (response) {
_this.msg = response.data.msg;
_this.db = {
username: "root",
password: "123456",
url: "localhost:3306/"
}
_this.connectBtnEnabled = false;
})
.catch(function (error) {
console.log(error);
});
}
}
})
</script>
</body>
</html>
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>
<#if column.type='INT'>
/**
* ${column.remark}
*/
private Integer ${
column.propertyName?uncap_first};
</#if>
<#if column.type='DATETIME'>
/**
* ${column.remark}
*/
private Date ${
column.propertyName?uncap_first};
</#if>
<#if column.type='BIGINT'>
/**
* ${column.remark}
*/
private Long ${
column.propertyName?uncap_first};
</#if>
<#if column.type='DOUBLE'>
/**
* ${column.remark}
*/
private Double ${
column.propertyName?uncap_first};
</#if>
<#if column.type='BIT'>
/**
* ${column.remark}
*/
private Boolean ${
column.propertyName?uncap_first};
</#if>
</#list>
</#if>
<#if columns??>
<#list columns as column>
<#if column.type='VARCHAR'||column.type='TEXT'||column.type='CHAR'>
public String get${
column.propertyName}(){
return ${
column.propertyName?uncap_first};
}
public void set${
column.propertyName}(String ${
column.propertyName?uncap_first}){
this.${
column.propertyName?uncap_first}=${
column.propertyName?uncap_first};
}
</#if>
<#if column.type='INT'>
public Integer get${
column.propertyName}(){
return ${
column.propertyName?uncap_first};
}
public void set${
column.propertyName}(Integer ${
column.propertyName?uncap_first}){
this.${
column.propertyName?uncap_first}=${
column.propertyName?uncap_first};
}
</#if>
<#if column.type='DATETIME'>
public Date get${
column.propertyName}(){
return ${
column.propertyName?uncap_first};
}
public void set${
column.propertyName}(Date ${
column.propertyName?uncap_first}){
this.${
column.propertyName?uncap_first}=${
column.propertyName?uncap_first};
}
</#if>
<#if column.type='BIGINT'>
public Long get${
column.propertyName}(){
return ${
column.propertyName?uncap_first};
}
public void set${
column.propertyName}(Long ${
column.propertyName?uncap_first}){
this.${
column.propertyName?uncap_first}=${
column.propertyName?uncap_first};
}
</#if>
<#if column.type='DOUBLE'>
public Double get${
column.propertyName}(){
return ${
column.propertyName?uncap_first};
}
public void set${
column.propertyName}(Double ${
column.propertyName?uncap_first}){
this.${
column.propertyName?uncap_first}=${
column.propertyName?uncap_first};
}
</#if>
<#if column.type='BIT'>
public Boolean get${
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};
}
</#if>
</#list>
</#if>
}
-
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${ modelName}s(); } -
Mapper.xml.ftl
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="${packageName}.mapper.${mapperName}"> <resultMap id="BaseResultMap" type="${packageName}.model.${modelName}"> <#list columns as column> <<#if column.primary??>id<#else>result</#if> column="${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}</#if>" /> </#list> </resultMap> <select id="getAll${modelName}s" resultMap="BaseResultMap"> select * from ${tableName}; </select> </mapper>
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<TableClass> 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<TableClass> 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<ColumnClass> 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
<resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> <resource> <directory>src/main/resources</directory> </resource> </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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转载：https://blog.csdn.net/Ares___/article/details/117249894
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