Java之利用Freemarker模板引擎實現代碼生成器，提升效率
https://blog.csdn.net/huangwenyi1010/article/details/71249258
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開心一笑
【1.你覺得我會眼睜睜的看着你去送死？我會閉着眼睛。2.給你講個故事，從前有個笨蛋，他很是笨，別人問他問題他只會回答「沒有」，這個故事你聽過嗎？】html
視頻教程
你們好，我錄製的視頻《Java之優雅編程之道》已經在CSDN學院發佈了，有興趣的同窗能夠購買觀看，相信你們必定會收穫到不少知識的。謝謝你們的支持……java
視頻地址：http://edu.csdn.net/lecturer/994web
提出問題
如何利用 Java + Freemarker 實現代碼生成器???spring
解決問題
* 前言 *
作業務開發的時候，常常要根據創建好的數據庫表，生成相關的 Model , DTO , Service, Controller , DAO 等等。包括基本的增刪改查。而這些細活每每比較簡單且沒有挑戰性，純粹苦力活。所以，根據公司的框架，開發一個代碼生成器是頗有必要的。sql
這裏：
假如你有必定的java基礎；
假如你熟悉freemarker模板引擎；
假如你熟悉MVC框架；
假如你熟悉Spring Data 框架數據庫
* 技術選型 *
因爲代碼生成器是要生成不少文件的，包 Test.java , TestDTO.java ,TestController.java , TestServiceImpl.java , ITestService.java , TestDAO.java 等等這些文件。全部考慮用 freemarker 強大的模板引擎，製做相關的模板。apache
* 實現思路 *
首先，假如在數據庫中有一張表 ay_test.
咱們首先要獲取數據庫的鏈接，這裏我只貼出相關的代碼。CREATE TABLE "public"."ay_test" (
"id" varchar(32) COLLATE "default" NOT NULL,
"name" varchar(10) COLLATE "default",
"birth_date" timestamp(6),
"remark" text COLLATE "default",
CONSTRAINT "ay_test_pkey" PRIMARY KEY ("id")
)
private final String URL = "jdbc:postgresql://192.168.3.160:10655/cibpm";
private final String USER = "postgres";
private final String PASSWORD = "888888";
private final String DRIVER = "org.postgresql.Driver";
public Connection getConnection() throws Exception{
Class.forName(DRIVER);
Connection connection= DriverManager.getConnection(URL, USER, PASSWORD);
return connection;
}
獲取數據庫表的元數據
private final String changeTableName = replaceUnderLineAndUpperCase(tableName); Connection connection = getConnection(); DatabaseMetaData databaseMetaData = connection.getMetaData(); ResultSet resultSet = databaseMetaData.getColumns(null,"%", tableName,"%");
最後根據元數據獲取表字段，註釋等等，生成相關的文件
代碼實現
Java代碼實現
package com.evada.inno.pm.code.generate.util;
import com.evada.inno.pm.code.generate.model.ColumnClass;
import freemarker.template.Template;
import org.apache.commons.lang3.StringUtils;
import java.io.*;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* 描述：代碼生成器
* Created by Ay on 2017/5/1.
*/
public class CodeGenerateUtils {
private final String AUTHOR = "Ay";
private final String CURRENT_DATE = "2017/05/03";
private final String tableName = "tm_project_quality_problem";
private final String packageName = "com.evada.pm.process.manage";
private final String tableAnnotation = "質量問題";
private final String URL = "jdbc:postgresql://192.168.3.160:10655/cibpm";
private final String USER = "postgres";
private final String PASSWORD = "888888";
private final String DRIVER = "org.postgresql.Driver";
private final String diskPath = "D://";
private final String changeTableName = replaceUnderLineAndUpperCase(tableName);
public Connection getConnection() throws Exception{
Class.forName(DRIVER);
Connection connection= DriverManager.getConnection(URL, USER, PASSWORD);
return connection;
}
public static void main(String[] args) throws Exception{
CodeGenerateUtils codeGenerateUtils = new CodeGenerateUtils();
codeGenerateUtils.generate();
}
public void generate() throws Exception{
try {
Connection connection = getConnection();
DatabaseMetaData databaseMetaData = connection.getMetaData();
ResultSet resultSet = databaseMetaData.getColumns(null,"%", tableName,"%");
//生成Mapper文件
generateMapperFile(resultSet);
//生成Dao文件
generateDaoFile(resultSet);
//生成Repository文件
generateRepositoryFile(resultSet);
//生成服務層接口文件
generateServiceInterfaceFile(resultSet);
//生成服務實現層文件
generateServiceImplFile(resultSet);
//生成Controller層文件
generateControllerFile(resultSet);
//生成DTO文件
generateDTOFile(resultSet);
//生成Model文件
generateModelFile(resultSet);
} catch (Exception e) {
throw new RuntimeException(e);
}finally{
}
}
private void generateModelFile(ResultSet resultSet) throws Exception{
final String suffix = ".java";
final String path = diskPath + changeTableName + suffix;
final String templateName = "Model.ftl";
File mapperFile = new File(path);
List<ColumnClass> columnClassList = new ArrayList<>();
ColumnClass columnClass = null;
while(resultSet.next()){
//id字段略過
if(resultSet.getString("COLUMN_NAME").equals("id")) continue;
columnClass = new ColumnClass();
//獲取字段名稱
columnClass.setColumnName(resultSet.getString("COLUMN_NAME"));
//獲取字段類型
columnClass.setColumnType(resultSet.getString("TYPE_NAME"));
//轉換字段名稱，如 sys_name 變成 SysName
columnClass.setChangeColumnName(replaceUnderLineAndUpperCase(resultSet.getString("COLUMN_NAME")));
//字段在數據庫的註釋
columnClass.setColumnComment(resultSet.getString("REMARKS"));
columnClassList.add(columnClass);
}
Map<String,Object> dataMap = new HashMap<>();
dataMap.put("model_column",columnClassList);
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateDTOFile(ResultSet resultSet) throws Exception{
final String suffix = "DTO.java";
final String path = "D://" + changeTableName + suffix;
final String templateName = "DTO.ftl";
File mapperFile = new File(path);
Map<String,Object> dataMap = new HashMap<>();
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateControllerFile(ResultSet resultSet) throws Exception{
final String suffix = "Controller.java";
final String path = diskPath + changeTableName + suffix;
final String templateName = "Controller.ftl";
File mapperFile = new File(path);
Map<String,Object> dataMap = new HashMap<>();
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateServiceImplFile(ResultSet resultSet) throws Exception{
final String suffix = "ServiceImpl.java";
final String path = diskPath + changeTableName + suffix;
final String templateName = "ServiceImpl.ftl";
File mapperFile = new File(path);
Map<String,Object> dataMap = new HashMap<>();
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateServiceInterfaceFile(ResultSet resultSet) throws Exception{
final String prefix = "I";
final String suffix = "Service.java";
final String path = diskPath + prefix + changeTableName + suffix;
final String templateName = "ServiceInterface.ftl";
File mapperFile = new File(path);
Map<String,Object> dataMap = new HashMap<>();
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateRepositoryFile(ResultSet resultSet) throws Exception{
final String suffix = "Repository.java";
final String path = diskPath + changeTableName + suffix;
final String templateName = "Repository.ftl";
File mapperFile = new File(path);
Map<String,Object> dataMap = new HashMap<>();
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateDaoFile(ResultSet resultSet) throws Exception{
final String suffix = "DAO.java";
final String path = diskPath + changeTableName + suffix;
final String templateName = "DAO.ftl";
File mapperFile = new File(path);
Map<String,Object> dataMap = new HashMap<>();
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateMapperFile(ResultSet resultSet) throws Exception{
final String suffix = "Mapper.xml";
final String path = diskPath + changeTableName + suffix;
final String templateName = "Mapper.ftl";
File mapperFile = new File(path);
Map<String,Object> dataMap = new HashMap<>();
generateFileByTemplate(templateName,mapperFile,dataMap);
}
private void generateFileByTemplate(final String templateName,File file,Map<String,Object> dataMap) throws Exception{
Template template = FreeMarkerTemplateUtils.getTemplate(templateName);
FileOutputStream fos = new FileOutputStream(file);
dataMap.put("table_name_small",tableName);
dataMap.put("table_name",changeTableName);
dataMap.put("author",AUTHOR);
dataMap.put("date",CURRENT_DATE);
dataMap.put("package_name",packageName);
dataMap.put("table_annotation",tableAnnotation);
Writer out = new BufferedWriter(new OutputStreamWriter(fos, "utf-8"),10240);
template.process(dataMap,out);
}
public String replaceUnderLineAndUpperCase(String str){
StringBuffer sb = new StringBuffer();
sb.append(str);
int count = sb.indexOf("_");
while(count!=0){
int num = sb.indexOf("_",count);
count = num + 1;
if(num != -1){
char ss = sb.charAt(count);
char ia = (char) (ss - 32);
sb.replace(count , count + 1,ia + "");
}
}
String result = sb.toString().replaceAll("_","");
return StringUtils.capitalize(result);
}
}
FreeMarkerTemplateUtils工具類
FreeMarkerTemplateUtils工具類用來配置模板所在的路徑編程
package com.evada.inno.pm.code.generate.util;
import com.evada.inno.core.exception.BusinessException;
import freemarker.cache.ClassTemplateLoader;
import freemarker.cache.NullCacheStorage;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateExceptionHandler;
import java.io.IOException;
/**
* Created by Ay on 2016/7/27.
*/
public class FreeMarkerTemplateUtils {
private FreeMarkerTemplateUtils(){}
private static final Configuration CONFIGURATION = new Configuration(Configuration.VERSION_2_3_22);
static{
//這裏比較重要，用來指定加載模板所在的路徑
CONFIGURATION.setTemplateLoader(new ClassTemplateLoader(FreeMarkerTemplateUtils.class, "/templates"));
CONFIGURATION.setDefaultEncoding("UTF-8");
CONFIGURATION.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
CONFIGURATION.setCacheStorage(NullCacheStorage.INSTANCE);
}
public static Template getTemplate(String templateName) throws IOException {
try {
return CONFIGURATION.getTemplate(templateName);
} catch (IOException e) {
throw e;
}
}
public static void clearCache() {
CONFIGURATION.clearTemplateCache();
}
}
實體類 ColumnClass
ColumnClass 用來封裝 數據庫表元數據的信息，如字段名稱，字段類型，字段註釋等等。api
package com.evada.inno.pm.code.generate.model;
/**
* 數據庫字段封裝類
* Created by Ay on 2017/5/3.
*/
public class ColumnClass {
/** 數據庫字段名稱 **/
private String columnName;
/** 數據庫字段類型 **/
private String columnType;
/** 數據庫字段首字母小寫且去掉下劃線字符串 **/
private String changeColumnName;
/** 數據庫字段註釋 **/
private String columnComment;
public String getColumnComment() {
return columnComment;
}
public void setColumnComment(String columnComment) {
this.columnComment = columnComment;
}
public String getColumnName() {
return columnName;
}
public void setColumnName(String columnName) {
this.columnName = columnName;
}
public String getColumnType() {
return columnType;
}
public void setColumnType(String columnType) {
this.columnType = columnType;
}
public String getChangeColumnName() {
return changeColumnName;
}
public void setChangeColumnName(String changeColumnName) {
this.changeColumnName = changeColumnName;
}
}
freemarker 模板文件
Freemarker的模板文件，後綴都是以ftl結尾的。markdown
Model.ftl模型模板
Model.ftl能夠生成字段的屬性，而且能夠生成字段屬性對應的 set 和 get 方法，包括字段在數據庫中對應的註釋，以及一些該引入的包和類註釋。
package ${package_name}.model;
import com.evada.inno.common.domain.BaseModel;
import com.evada.inno.common.listener.ICreateListenable;
import com.evada.inno.common.listener.IDeleteListenable;
import com.evada.inno.common.listener.IModifyListenable;
import org.hibernate.annotations.Where;
import javax.persistence.*;
import java.util.Date;
/**
* 描述：${table_annotation}模型
* @author ${author}
* @date ${date}
*/
@Entity
@Table(name="${table_name_small}")
@Where(clause = "status > '0'")
@Inheritance(strategy= InheritanceType.SINGLE_TABLE)
public class ${table_name} extends BaseModel implements ICreateListenable,IModifyListenable,IDeleteListenable {
<#if model_column?exists>
<#list model_column as model>
/**
*${model.columnComment!}
*/
<#if (model.columnType = 'varchar' || model.columnType = 'text')>
@Column(name = "${model.columnName}",columnDefinition = "VARCHAR")
private String ${model.changeColumnName?uncap_first};
</#if>
<#if model.columnType = 'timestamp' >
@Column(name = "${model.columnName}",columnDefinition = "TIMESTAMP")
private Date ${model.changeColumnName?uncap_first};
</#if>
</#list>
</#if>
<#if model_column?exists>
<#list model_column as model>
<#if (model.columnType = 'varchar' || model.columnType = 'text')>
public String get${model.changeColumnName}() {
return this.${model.changeColumnName?uncap_first};
}
public void set${model.changeColumnName}(String ${model.changeColumnName?uncap_first}) {
this.${model.changeColumnName?uncap_first} = ${model.changeColumnName?uncap_first};
}
</#if>
<#if model.columnType = 'timestamp' >
public Date get${model.changeColumnName}() {
return this.${model.changeColumnName?uncap_first};
}
public void set${model.changeColumnName}(Date ${model.changeColumnName?uncap_first}) {
this.${model.changeColumnName?uncap_first} = ${model.changeColumnName?uncap_first};
}
</#if>
</#list>
</#if>
}
DTO.ftl模板
DTO.ftl 文件用來生產 DTO 值對象，該對象繼承 Model.ftl 文件中的對象。
package ${package_name}.dto;
import ${package_name}.model.${table_name};
/**
* 描述：${table_annotation}DTO
* @author ${author}
* @date ${date}
*/
public class ${table_name}DTO extends ${table_name}{
}
Service.ftl模板
Service.ftl 模板用來生成服務層實現類，在模板中已經添加了增 ，刪，改，查等方法，同時能夠注入DAO和repository 到service中，一旦文件生成，就不須要咱們去寫了，很方便，提升開發的效率。
package ${package_name}.service.impl;
import com.evada.inno.core.service.impl.BaseServiceImpl;
import ${package_name}.model.${table_name};
import ${package_name}.repository.${table_name}Repository;
import ${package_name}.service.I${table_name}Service;
import ${package_name}.repository.mybatis.${table_name}DAO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import ${package_name}.dto.${table_name}DTO;
import org.apache.commons.beanutils.BeanUtils;
import com.evada.inno.core.enums.StatusEnum;
/**
* 描述：${table_annotation} 服務實現層
* @author ${author}
* @date ${date}
*/
@Service
public class ${table_name}ServiceImpl extends BaseServiceImpl<${table_name}, String> implements I${table_name}Service {
@Autowired
private ${table_name}DAO ${table_name?uncap_first}DAO;
@Autowired
private ${table_name}Repository ${table_name?uncap_first}Repository;
@Override
public ${table_name}DTO findDTOById(String id) throws Exception {
${table_name}DTO ${table_name?uncap_first}DTO = ${table_name?uncap_first}DAO.findDTOById(id);
return ${table_name?uncap_first}DTO;
}
@Override
public ${table_name}DTO create${table_name}(${table_name}DTO ${table_name?uncap_first}DTO) throws Exception {
${table_name} ${table_name?uncap_first} = new ${table_name}();
BeanUtils.copyProperties(${table_name?uncap_first},${table_name?uncap_first}DTO);
${table_name?uncap_first}.setStatus(StatusEnum.ENABLE.toString());
${table_name?uncap_first} = ${table_name?uncap_first}Repository.saveAndFlush(${table_name?uncap_first});
return this.findDTOById(${table_name?uncap_first}.getId());
}
@Override
public ${table_name}DTO update${table_name}(${table_name}DTO ${table_name?uncap_first}DTO)throws Exception {
${table_name} ${table_name?uncap_first} = new ${table_name}();
BeanUtils.copyProperties(${table_name?uncap_first},${table_name?uncap_first}DTO);
${table_name?uncap_first} = ${table_name?uncap_first}Repository.saveAndFlush(${table_name?uncap_first});
return this.findDTOById(${table_name?uncap_first}.getId());
}
Interface.ftl 模板
Interface.ftl 用來生成服務層接口，接口中定義了增，刪，改，查等接口。
package ${package_name}.service;
import com.evada.inno.core.service.IBaseService;
import ${package_name}.model.${table_name};
import ${package_name}.dto.${table_name}DTO;
/**
* 描述：${table_annotation} 服務實現層接口
* @author ${author}
* @date ${date}
*/
public interface I${table_name}Service extends IBaseService<${table_name},String> {
/**
* 描述：根據Id獲取DTO
* @param id
*/
${table_name}DTO findDTOById(String id)throws Exception;
${table_name}DTO create${table_name}(${table_name}DTO ${table_name?uncap_first}DTO) throws Exception;
void delete${table_name}(String id) throws Exception;
${table_name}DTO update${table_name}(${table_name}DTO ${table_name?uncap_first}DTO) throws Exception;
}
Respontory.ftl 模板
Respontory.ftl 用來生成 Repository 文件，這一塊是 Spring Data的內容，可能不一樣的公司，使用的框架不同。
package ${package_name}.repository;
import com.evada.inno.core.repository.BaseJpaRepository;
import ${package_name}.model.${table_name};
/**
* 描述：${table_annotation} Repository接口
* @author ${author}
* @date ${date}
*/
public interface ${table_name}Repository extends BaseJpaRepository<${table_name}, String> {
}
Mappter.ftl 模板
Mappter.ftl 用來生成 MyBatis 使用到的 mappter 文件，在文件中，定義了查詢的sql語句。
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="${package_name}.repository.mybatis.${table_name}DAO">
<resultMap id="${table_name}DTOResultMap" type="${package_name}.dto.${table_name}DTO"></resultMap>
<sql id="findDtoSql">
select * from (
select * from ${table_name_small} temp
) t
</sql>
<select id="findDTOById" parameterType="String" resultMap="${table_name}DTOResultMap">
<include refid="findDtoSql"></include>
<where>
and t.id = ${r'#{id}'}
</where>
</select>
<select id="find${table_name}Page" parameterType="${package_name}.dto.${table_name}DTO" resultMap="${table_name}DTOResultMap">
<include refid="findDtoSql" />
<where>
</where>
</select>
</mapper>
Controller.ftl 模板
Controller.ftl 文件用來生成控制層類，類中已經幫咱們生成了，增，刪，改，查等路由。同時能夠注入接口道控制層中。
package ${package_name}.controller;
import com.evada.inno.core.annotation.Rest;
import ${package_name}.service.I${table_name}Service;
import ${package_name}.model.${table_name};
import ${package_name}.dto.${table_name}DTO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.http.MediaType;
import com.evada.inno.common.domain.ResultData;
import com.evada.inno.core.util.AssertUtils;
/**
* 描述：${table_annotation}控制層
* @author ${author}
* @date ${date}
*/
@Rest(${table_name}.class)
public class ${table_name}Controller {
@Autowired
private I${table_name}Service ${table_name?uncap_first}Service;
/**
* 描述：根據Id 查詢
* @param id ${table_annotation}id
*/
@RequestMapping(value = "/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public ResultData findById(@PathVariable("id") String id)throws Exception {
${table_name}DTO ${table_name?uncap_first}DTO = ${table_name?uncap_first}Service.findDTOById(id);
AssertUtils.checkResourceFound(${table_name?uncap_first}DTO);
return new ResultData(${table_name}DTO.class, ${table_name?uncap_first}DTO);
}
/**
* 描述:建立${table_annotation}
* @param ${table_name?uncap_first}DTO ${table_annotation}DTO
*/
@RequestMapping(value = "", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public ResultData create(@RequestBody ${table_name}DTO ${table_name?uncap_first}DTO) throws Exception {
return new ResultData(${table_name}.class,${table_name?uncap_first}Service.create${table_name}(${table_name?uncap_first}DTO));
}
/**
* 描述：刪除${table_annotation}
* @param id ${table_annotation}id
*/
@RequestMapping(value = "/{id}/bulk", method = RequestMethod.DELETE, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public void deleteById(@PathVariable("id") String id) throws Exception {
${table_name?uncap_first}Service.deleteById(id);
}
/**
* 描述：更新${table_annotation}
* @param id ${table_annotation}id
*/
@RequestMapping(value = "/{id}", method = RequestMethod.PUT, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public ResultData update${table_name}(@PathVariable("id") String id,@RequestBody ${table_name}DTO ${table_name?uncap_first}DTO) throws Exception {
${table_name?uncap_first}DTO.setId(id);
return new ResultData(${table_name}.class,${table_name?uncap_first}Service.update${table_name}(${table_name?uncap_first}DTO));
}
}
經過上面的代碼生成，咱們就能夠把生成的文件複製到相關的目錄，從新啓動系統，這樣，基本的增，刪，改，查就實現了。
讀書感悟
來自東野圭吾《信》
- 「大多數人都想置身於遠離罪犯的地方。和犯罪者，特別是犯下搶劫殺人這樣噁心犯罪的人，哪怕是間接的關係也不想有。由於稍微有點什麼關係，沒準也會被捲入莫名其妙的事情中去。排斥犯罪者或是與其近似的人，是很是正當的行爲，也能夠說是正當防衛的本能。」
- 犯罪者必需要有這樣的思想準備，就是本身犯罪的同時也抹殺了本身親屬在社會上的存在。
- 所謂偏見，就是不平等看待，其產生的根源就在於人的自私本性。這裏的不平等看待，其實能夠視爲一種處理各類社會關係時的態度平衡缺失，而老是向有利於本身的一方傾斜，除非不一樣的立場之間不存在厲害衝突。通常狀況下，人都是首先從本身的角度來看問題，而不會力圖站在他人的立場來考量，徹底意義上的中立是不可能的，由己及人是必然的思惟定勢，偏見遂天然而生。
經典故事
【一隻小青蛙厭倦了常年生活的小水溝——水溝的水愈來愈少，它已經沒有什麼食物了。小青蛙天天都不停地蹦，想要逃離這個地方。而它的同伴整日懶洋洋地蹲在渾濁的水窪裏，說：「如今不是還餓不死
嗎?你着什麼急?」終於有一天，小青蛙縱身一躍，跳進了旁邊的一個大河塘，那裏面有不少好吃的，它能夠自由遊弋。小青蛙呱呱地呼喚本身的夥伴：「你快過來吧，這邊簡直是天堂!」可是它的同伴說：「我在這裏已經習慣了，我從小就生活在這裏，懶得動了!」 不久，水溝裏的水乾了，小青蛙的同伴活活餓死了。】
大神文章
【1】Freemarker官網
【2】可用於企業級開發的JAVA代碼生成器
【3】 一個java代碼生成器的簡單實現
其餘
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