9.基于SpringBoot3+MybatisPlus定制化代码生成器类

我们在3.基于SpringBoot3集成MybatisPlus中讲到自定义代码生成器，但是往往遗留代码生成的类格式或者命名不符合要求，需要手工修改，但是当表很多时就比较头痛,所以我们自定义模板在进行代码生成

1. 新建MyTemplateEngine.java类

里面大多实现直接拷贝自VelocityTemplateEngine.java, 只是增加了反射，修改包名，搜索修改地方即可找到两处位置

public class MyTemplateEngine extends AbstractTemplateEngine {

    /**
     * 批量输出 java xml 文件
     */
    @NotNull
    public AbstractTemplateEngine batchOutput() {
        try {
            ConfigBuilder config = this.getConfigBuilder();
            List<TableInfo> tableInfoList = config.getTableInfoList();
            tableInfoList.forEach(tableInfo -> {
                Map<String, Object> objectMap = this.getObjectMap(config, tableInfo);
                // 修改地方一:通过反射修改属性值,替换不需要的前缀
                Class<? extends  TableInfo> clazz = tableInfo.getClass();
                try {
                    Field name = clazz.getDeclaredField("name");
                    name.setAccessible(true);
                    name.set(tableInfo, tableInfo.getName().replaceFirst("tb_", ""));

                    Field entityName = clazz.getDeclaredField("entityName");
                    entityName.setAccessible(true);
                    entityName.set(tableInfo, tableInfo.getEntityName().replaceFirst("Tb", ""));

                    Field mapperName = clazz.getDeclaredField("mapperName");
                    mapperName.setAccessible(true);
                    mapperName.set(tableInfo, tableInfo.getMapperName().replaceFirst("Tb", ""));

                    Field xmlName = clazz.getDeclaredField("xmlName");
                    xmlName.setAccessible(true);
                    xmlName.set(tableInfo, tableInfo.getXmlName().replaceFirst("Tb", ""));

                    Field serviceName = clazz.getDeclaredField("serviceName");
                    serviceName.setAccessible(true);
                    serviceName.set(tableInfo, tableInfo.getServiceName().replaceFirst("ITb", ""));

                    Field serviceImplName = clazz.getDeclaredField("serviceImplName");
                    serviceImplName.setAccessible(true);
                    serviceImplName.set(tableInfo, tableInfo.getServiceImplName().replaceFirst("Tb", ""));

                    Field controllerName = clazz.getDeclaredField("controllerName");
                    controllerName.setAccessible(true);
                    controllerName.set(tableInfo, tableInfo.getControllerName().replaceFirst("Tb", ""));
                } catch (NoSuchFieldException e) {
                    throw new RuntimeException(e);
                } catch (IllegalAccessException e) {
                    throw new RuntimeException(e);
                }
                Optional.ofNullable(config.getInjectionConfig()).ifPresent(t -> {
                    // 添加自定义属性
                    t.beforeOutputFile(tableInfo, objectMap);
                    // 输出自定义文件
                    outputCustomFile(t.getCustomFiles(), tableInfo, objectMap);
                });
		// 修改地方二
                objectMap.put("entity", String.valueOf(objectMap.get("entity")).replaceFirst("Tb", ""));
                // entity
                outputEntity(tableInfo, objectMap);
                // mapper and xml
                outputMapper(tableInfo, objectMap);
                // service
                outputService(tableInfo, objectMap);
                // controller
                outputController(tableInfo, objectMap);
            });
        } catch (Exception e) {
            throw new RuntimeException("无法创建文件，请检查配置信息！", e);
        }
        return this;
    }

    private VelocityEngine velocityEngine;

    {
        try {
            Class.forName("org.apache.velocity.util.DuckType");
        } catch (ClassNotFoundException e) {
            // velocity1.x的生成格式错乱 https://github.com/baomidou/generator/issues/5
            LOGGER.warn("Velocity 1.x is outdated, please upgrade to 2.x or later.");
        }
    }

    @Override
    public @NotNull MyTemplateEngine init(@NotNull ConfigBuilder configBuilder) {
        if (null == velocityEngine) {
            Properties p = new Properties();
            p.setProperty(ConstVal.VM_LOAD_PATH_KEY, ConstVal.VM_LOAD_PATH_VALUE);
            p.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, StringPool.EMPTY);
            p.setProperty(Velocity.ENCODING_DEFAULT, ConstVal.UTF8);
            p.setProperty(Velocity.INPUT_ENCODING, ConstVal.UTF8);
            p.setProperty("file.resource.loader.unicode", StringPool.TRUE);
            velocityEngine = new VelocityEngine(p);
        }
        return this;
    }


    @Override
    public void writer(@NotNull Map<String, Object> objectMap, @NotNull String templatePath, @NotNull File outputFile) throws Exception {
        Template template = velocityEngine.getTemplate(templatePath, ConstVal.UTF8);
        try (FileOutputStream fos = new FileOutputStream(outputFile);
             OutputStreamWriter ow = new OutputStreamWriter(fos, ConstVal.UTF8);
             BufferedWriter writer = new BufferedWriter(ow)) {
            template.merge(new VelocityContext(objectMap), writer);
        }
        LOGGER.debug("模板:" + templatePath + ";  文件:" + outputFile);
    }


    @Override
    public @NotNull String templateFilePath(@NotNull String filePath) {
        final String dotVm = ".vm";
        return filePath.endsWith(dotVm) ? filePath : filePath + dotVm;
    }
}

2. 模板文件替换修改

IDEA全局搜索需要的下图文件，拷贝至resources/templates下，然后把里面的内容根据自己需求进行模板调整

3. 代码生成类

之前是Swagger注解，我们调整为Springdoc注解，并对实体不额外添加后缀%s

public class FastAutoGeneratorTest {
    public static void main(String[] args) {
        DataSourceConfig.Builder dataSourceConfig = new DataSourceConfig.Builder("jdbc:mysql://XXXX:3306/yy_dev?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&autoReconnect=true&failOverReadOnly=false&allowMultiQueries=true&serverTimezone=Asia/Shanghai","root","Gensci@123");
        FastAutoGenerator.create(dataSourceConfig)
                // 全局配置
                .globalConfig((scanner, builder) -> builder.enableSpringdoc().author(scanner.apply("请输入作者名称？")))
                // 包配置
                .packageConfig((scanner, builder) -> builder.parent(scanner.apply("请输入包名？")))
                // 策略配置
                .templateEngine(new MyTemplateEngine())
                .strategyConfig((scanner, builder) -> builder.addInclude(getTables(scanner.apply("请输入表名，多个英文逗号分隔？所有输入 all")))
                        .controllerBuilder().enableRestStyle().enableHyphenStyle()
                        .entityBuilder().enableLombok().enableTableFieldAnnotation().idType(IdType.INPUT).formatFileName("%s").build())
                .execute();
    }

    // 处理 all 情况
    protected static List<String> getTables(String tables) {
        return "all".equals(tables) ? Collections.emptyList() : Arrays.asList(tables.split(","));
    }
}