Java實現(xiàn)一鍵生成表controller,service,mapper文件
更新時間：2023年05月17日 15:39:54 作者：zyqok
這篇文章主要為大家詳細(xì)介紹了如何利用Java語言實現(xiàn)一鍵生成表controller,service,mapper文件，文中的示例代碼講解詳細(xì)，需要的可以收藏一下
controller、service、Mapper文件的作用
Controller：控制器
業(yè)務(wù)模塊流程的控制，不同的業(yè)務(wù)流程有不同的控制器
負(fù)責(zé)請求轉(zhuǎn)發(fā)，接收頁面過來的參數(shù)，傳給service處理，接到返回值，并再次傳給頁面
- 控制處理前端請求和響應(yīng)，與前端進(jìn)行交互，給前端提供接口
- 調(diào)用Service層（定義的接口）
- 如果只是簡單增刪可以調(diào)用Mapper（不推薦）
Service：服務(wù)
相對獨立，負(fù)責(zé)業(yè)務(wù)邏輯（功能）的設(shè)計，是一個接口類
Mapper:（DAO）
訪問數(shù)據(jù)庫，對數(shù)據(jù)庫進(jìn)行操作，提供接口給Service層
- 當(dāng)sql語句發(fā)生變化更改時，我們可以只修改對應(yīng)的XML文件，而無需再修改Mapper，這樣每次更改sql語句時，代碼就可以不用再次重新編譯！
- 直接與數(shù)據(jù)庫打交道(執(zhí)行SQL語句)，接口提供給service層
下圖為java約定俗成的幾個文件的作用
實現(xiàn)代碼
package com.unisoc.isupport.utils;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* @author Yuanqiang.Zhang
* @since 2023/5/15
*/
public class GeneratorTool {
/**
* 數(shù)據(jù)庫連接信息
*/
private static String IP = "172.0.0.1";
private static int PORT = 3306;
private static String DATABASE_NAME = "zyq_test";
private static String USERNAME = "root";
private static String PASSWORD = "root";
/**
* 創(chuàng)建者
*/
private static String AUTHOR = "YuanQiang.Zhang";
/**
* 基礎(chǔ)包路徑
*/
private static String BASE_PACKAGE = "com.zdb";
/**
* 需要生成的表
*/
private static String[] TABLE_NAMES = {"z_word"};
/**
* 忽略的前綴
*/
private static String[] IGNORE_PREFIX = {"z_"};
/**
* 主方法運行
*
* @param args args
*/
public static void main(String[] args) {
Connection conn = getConnection();
for (String tableName : TABLE_NAMES) {
createTableFiles(conn, tableName);
}
}
private static String getWithoutPrefixTableName(String tableName) {
if (IGNORE_PREFIX.length == 0) {
return tableName;
}
for (String s : IGNORE_PREFIX) {
if (tableName.startsWith(s)) {
return tableName.substring(s.length());
}
}
return tableName;
}
public static void createTableFiles(Connection conn, String tableName) {
List<String[]> fields = getTableFields(conn, tableName);
String withoutPrefixTableName = getWithoutPrefixTableName(tableName);
String className = getClassName(withoutPrefixTableName);
createEntity(fields, tableName, className, withoutPrefixTableName);
// createMapper(withoutPrefixTableName, className);
// createMapperXml(withoutPrefixTableName, className);
// createService(withoutPrefixTableName, className);
// createServiceImpl(withoutPrefixTableName, className);
// createController(withoutPrefixTableName, className);
}
public static void createController(String tableName, String className) {
StringBuilder sb = new StringBuilder();
sb.append(String.format("package %s.controller;\n\n", BASE_PACKAGE));
sb.append(String.format("import %s.service.%sService;\n", BASE_PACKAGE, className));
sb.append("import lombok.extern.slf4j.Slf4j;\n");
sb.append("import org.springframework.web.bind.annotation.RequestMapping;\n");
sb.append("import org.springframework.web.bind.annotation.RestController;\n");
sb.append("import org.springframework.beans.factory.annotation.Autowired;\n\n");
sb.append("/**\n");
sb.append(String.format(" * @author %s\n", AUTHOR));
sb.append(String.format(" * @since %s\n", formatDateTime(new Date())));
sb.append(" */\n");
sb.append("@RestController\n");
sb.append("@Slf4j\n");
String path = String.valueOf(className.toCharArray()[0]).toLowerCase() + className.substring(1);
sb.append(String.format("@RequestMapping(\"/%s\")\n", path));
sb.append(String.format("public class %sController {\n\n", className));
sb.append(" @Autowired\n");
sb.append(String.format(" private %sService service;\n\n", className));
sb.append("}\n");
String fileName = className + "Controller.java";
String filePath = getBasePath() + "/controller/" + fileName;
File file = new File(filePath);
if (file.exists()) {
System.out.println(tableName + " 的 Controller 類已經(jīng)存在，不再生成。");
} else {
writeFileContent(file, sb.toString());
System.out.println(tableName + " 的 Controller 類生成完畢。");
}
}
public static void createServiceImpl(String tableName, String className) {
StringBuilder sb = new StringBuilder();
sb.append(String.format("package %s.service.impl;\n\n", BASE_PACKAGE));
sb.append("import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;\n");
sb.append(String.format("import %s.entity.%s;\n", BASE_PACKAGE, className));
sb.append(String.format("import %s.mapper.%sMapper;\n", BASE_PACKAGE, className));
sb.append(String.format("import %s.service.%sService;\n", BASE_PACKAGE, className));
sb.append("import lombok.extern.slf4j.Slf4j;\n");
sb.append("import org.springframework.beans.factory.annotation.Autowired;\n");
sb.append("import org.springframework.stereotype.Service;\n\n");
sb.append("/**\n");
sb.append(String.format(" * @author %s\n", AUTHOR));
sb.append(String.format(" * @since %s\n", formatDateTime(new Date())));
sb.append(" */\n");
sb.append("@Slf4j\n");
sb.append("@Service\n");
sb.append(String.format("public class %sServiceImpl extends ServiceImpl<%sMapper, %s> implements %sService { \n\n", className, className, className, className));
sb.append(" @Autowired\n");
sb.append(String.format(" private %sMapper mapper;\n\n", className));
sb.append("}\n");
String fileName = className + "ServiceImpl.java";
String filePath = getBasePath() + "/service/impl/" + fileName;
File file = new File(filePath);
if (file.exists()) {
System.out.println(tableName + " 的 ServiceImpl 已經(jīng)存在，不再生成。");
} else {
writeFileContent(file, sb.toString());
System.out.println(tableName + " 的 ServiceImpl 生成完畢。");
}
}
public static void createService(String tableName, String className) {
StringBuilder sb = new StringBuilder();
sb.append(String.format("package %s.service;\n\n", BASE_PACKAGE));
sb.append("import com.baomidou.mybatisplus.extension.service.IService;\n");
sb.append(String.format("import %s.entity.%s;\n\n", BASE_PACKAGE, className));
sb.append("/**\n");
sb.append(String.format(" * @author %s\n", AUTHOR));
sb.append(String.format(" * @since %s\n", formatDateTime(new Date())));
sb.append(" */\n");
sb.append(String.format("public interface %sService extends IService<%s> {\n\n", className, className));
sb.append("}\n");
String fileName = className + "Service.java";
String filePath = getBasePath() + "/service/" + fileName;
File file = new File(filePath);
if (file.exists()) {
System.out.println(tableName + " 的 Service 類已經(jīng)存在，不再生成。");
} else {
writeFileContent(file, sb.toString());
System.out.println(tableName + " 的 Service 類生成完畢。");
}
}
public static void createMapperXml(String tableName, String className) {
StringBuilder sb = new StringBuilder();
sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
sb.append("<!DOCTYPE mapper PUBLIC \"-//mybatis.org//DTD Mapper 3.0//EN\" \"http://mybatis.org/dtd/mybatis-3-mapper.dtd\">\n");
sb.append(String.format("<mapper namespace=\"%s.mapper.%sMapper\">\n\n", BASE_PACKAGE, className));
sb.append("</mapper>\n");
String fileName = className + "Mapper.xml";
String filePath = "src/main/resources/mapper/" + fileName;
File file = new File(filePath);
if (file.exists()) {
System.out.println(tableName + " 的 Mapper.xml 已經(jīng)存在，不再生成。");
} else {
writeFileContent(file, sb.toString());
System.out.println(tableName + " 的 Mapper.xml 生成完畢。");
}
}
public static void createMapper(String tableName, String className) {
StringBuilder sb = new StringBuilder();
sb.append(String.format("package %s.mapper;\n\n", BASE_PACKAGE));
sb.append(String.format("import %s.entity.%s;\n", BASE_PACKAGE, className));
sb.append("import com.baomidou.mybatisplus.core.mapper.BaseMapper;\n\n");
sb.append("/**\n");
sb.append(String.format(" * @author %s\n", AUTHOR));
sb.append(String.format(" * @since %s\n", formatDateTime(new Date())));
sb.append(" */\n");
sb.append(String.format("public interface %sMapper extends BaseMapper<%s> {\n\n", className, className));
sb.append("}\n");
String fileName = className + "Mapper.java";
String filePath = getBasePath() + "/mapper/" + fileName;
File file = new File(filePath);
if (file.exists()) {
System.out.println(tableName + " 的 Mapper 類已經(jīng)存在，不再生成。");
} else {
writeFileContent(file, sb.toString());
System.out.println(tableName + " 的 Mapper 類生成完畢。");
}
}
public static void createEntity(List<String[]> fields, String tableName, String className, String withoutPrefixTableName) {
StringBuilder sb = new StringBuilder();
sb.append(String.format("package %s.entity;\n\n", BASE_PACKAGE));
sb.append("import com.baomidou.mybatisplus.annotation.*;\n");
sb.append("import lombok.Data;\n\n");
// 判斷是否有 timestamp 類型
if (hasDate(fields)) {
sb.append("import java.util.Date;\n\n");
}
sb.append("/**\n");
sb.append(" * @author " + AUTHOR + "\n");
sb.append(" * @since " + formatDateTime(new Date()) + "\n");
sb.append(" */\n");
sb.append("@Data\n");
sb.append(String.format("@TableName(\"%s\")\n", tableName));
sb.append(String.format("public class %s {\n\n", className));
for (String[] attrs : fields) {
String columnName = attrs[0];
String dataType = attrs[1];
String columnComment = attrs[2];
String columnKey = attrs[3];
if ("PRI".equals(columnKey)) {
sb.append(" /** 主鍵 */\n");
sb.append(String.format(" @TableId(value = \"%s\", type = IdType.AUTO)\n", columnName));
} else {
if (Objects.nonNull(columnComment) && !columnComment.isEmpty()) {
sb.append(String.format(" /** %s */\n", columnComment));
}
sb.append(String.format(" @TableField(value = \"%s\")\n", columnName));
}
String fieldName = getFieldName(columnName);
if (dataType.endsWith("int")) {
if ("bigint".equals(dataType)) {
sb.append(String.format(" private Long %s;\n", fieldName));
} else {
sb.append(String.format(" private Integer %s;\n", fieldName));
}
} else if (dataType.endsWith("char") || dataType.endsWith("text")) {
sb.append(String.format(" private String %s;\n", fieldName));
} else if ("timestamp".equals(dataType) || "datetime".equals(dataType)) {
sb.append(String.format(" private Date %s;\n", fieldName));
} else if ("double".equals(dataType)) {
sb.append(String.format(" private Double %s;\n", fieldName));
} else {
System.err.println("發(fā)現(xiàn)沒有判斷到的數(shù)據(jù)類型：" + dataType);
}
sb.append("\n");
}
sb.append("\n}");
String fileName = className + ".java";
String filePath = getBasePath() + "/entity/" + fileName;
File file = new File(filePath);
if (file.exists()) {
System.out.println(withoutPrefixTableName + " 的 Entity 類已經(jīng)存在，不再生成。");
} else {
writeFileContent(file, sb.toString());
System.out.println(withoutPrefixTableName + " 的 Entity 類生成完畢。");
}
}
private static String getBasePath() {
return "src/main/java/" + BASE_PACKAGE.replace(".", "/");
}
private static String getFieldName(String columnName) {
if (!columnName.contains("_")) {
StringBuilder sb = new StringBuilder();
char[] chars = columnName.toCharArray();
sb.append(String.valueOf(chars[0]).toLowerCase());
if (chars.length <= 1) {
return sb.toString();
} else {
for (int i = 1; i < chars.length; i++) {
sb.append(chars[i]);
}
}
return sb.toString();
}
String s = getClassName(columnName);
return String.valueOf(s.toCharArray()[0]).toLowerCase() + s.substring(1);
}
private static boolean hasDate(List<String[]> fields) {
if (Objects.isNull(fields) || fields.isEmpty()) {
return false;
}
for (String[] attrs : fields) {
String dataType = attrs[1];
if ("timestamp".equals(dataType) || "datetime".equals(dataType)) {
return true;
}
}
return false;
}
private static List<String[]> getTableFields(Connection conn, String tableName) {
String sql = "SELECT * FROM information_schema.columns WHERE table_schema = '" + DATABASE_NAME + "' AND table_name = '" + tableName + "'";
List<String[]> fields = new ArrayList<>();
try {
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery(sql);
while (rs.next()) {
String columnName = rs.getString("COLUMN_NAME");
String dataType = rs.getString("DATA_TYPE");
String columnComment = rs.getString("COLUMN_COMMENT");
String columnKey = rs.getString("COLUMN_KEY");
String[] attrs = new String[4];
attrs[0] = columnName;
attrs[1] = dataType;
attrs[2] = columnComment;
attrs[3] = columnKey;
fields.add(attrs);
}
} catch (Exception e) {
e.printStackTrace();
}
return fields;
}
/**
* 獲取類名
*
* @param tableName 表名
* @return 類名
*/
private static String getClassName(String tableName) {
char[] chars = tableName.toCharArray();
boolean flag = true;
StringBuilder sb = new StringBuilder();
for (char c : chars) {
if (c == '_') {
flag = true;
continue;
}
if (flag) {
sb.append(String.valueOf(c).toUpperCase());
} else {
sb.append(String.valueOf(c).toLowerCase());
}
flag = false;
}
return sb.toString();
}
/**
* 獲取數(shù)據(jù)庫鏈接
*
* @return Connection
*/
private static Connection getConnection() {
try {
Class.forName("com.mysql.cj.jdbc.Driver");
String url = String.format("jdbc:mysql://%s:%s/%s", IP, PORT, DATABASE_NAME);
return DriverManager.getConnection(url, USERNAME, PASSWORD);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 將內(nèi)容寫入到文件中
*
* @param file 文件
* @param content 內(nèi)容
*/
public static void writeFileContent(File file, String content) {
String parentPath = file.getParent();
if (Objects.nonNull(parentPath) && !parentPath.isEmpty()) {
File parent = new File(parentPath);
if (!parent.exists()) {
parent.mkdirs();
}
}
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
try (FileWriter writer = new FileWriter(file)) {
writer.write(content);
writer.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
private static String formatDateTime(Date date) {
return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA).format(date);
}
}到此這篇關(guān)于Java實現(xiàn)一鍵生成表controller,service,mapper文件的文章就介紹到這了,更多相關(guān)Java生成文件內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
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