版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/zhangpan_soft/article/details/79389936
废话少说,直接上代码
package com.sx.utils.mysql;
import com.sun.istack.internal.NotNull;
import com.sx.utils.StringUtils;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.HashMap;
import java.util.Map;
/**
* Created by Administrator on 2018/2/27 0027.
*/
public class GenerateEntityMysql {
private String url;// 数据库链接地址
private String username;// 用户名
private String password;//密码
private String tablename;//表名
private String databasename;// 数据库名
private String packagename;// 欲生成的实体类的包名
private String entityname;// 欲生成的实体类的名称
private String path;// 生成的实体类的文件夹路径
private Map<String, String> map = new HashMap<>();
public GenerateEntityMysql(
@NotNull String url,//
@NotNull String username,//
@NotNull String password, //
@NotNull String tablename, //
@NotNull String databasename,//
@NotNull String packagename, //
@NotNull String entityname,//
@NotNull String path) {
this.url = url;
this.username = username;
this.password = password;
this.tablename = tablename;
this.databasename = databasename;
this.packagename = packagename;
this.entityname = entityname;
this.path = path;
}
public void generate() {
// 查询欲生成实体类的表的详细信息
String sql = "SELECT information_schema.`COLUMNS`.* FROM information_schema.`COLUMNS` WHERE information_schema.`COLUMNS`.TABLE_SCHEMA=? AND information_schema.`COLUMNS`.TABLE_NAME=?";
try {
Connection conn;
PreparedStatement ps = null;
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, username, password);
System.out.println("connect database success...");
ps = conn.prepareStatement(sql);
ps.setString(1, databasename);
ps.setString(2, tablename);
ResultSet rs = ps.executeQuery();
StringBuilder sb = new StringBuilder();
sb.append("package ");
sb.append(packagename);
sb.append(";\n");
sb.append("public class ");
sb.append(entityname);
sb.append("{\n");
// 生成成员变量
while (rs.next()) {
String column_name = rs.getString("COLUMN_NAME");
column_name = StringUtils.underline2Camel(column_name.toLowerCase(), true);
String data_type = rs.getString("DATA_TYPE");
String column_comment = rs.getString("COLUMN_COMMENT");
sb.append("\tprivate ");
if (data_type.equalsIgnoreCase("TINYINT")) {
sb.append("Boolean ");
map.put(column_name, "Boolean");
} else if (data_type.equalsIgnoreCase("SMALLINT") ||
data_type.equalsIgnoreCase("MEDIUMINT") ||
data_type.equalsIgnoreCase("INT") ||
data_type.equalsIgnoreCase("INTEGER")) {
sb.append("Integer ");
map.put(column_name, "Integer");
} else if (data_type.equalsIgnoreCase("BIGINT")) {
sb.append("Long ");
map.put(column_name, "Long");
} else if (data_type.equalsIgnoreCase("FLOAT") ||
data_type.equalsIgnoreCase("DOUBLE")) {
sb.append("Double ");
map.put(column_name, "Double");
} else if (data_type.equalsIgnoreCase("DECIMAL")) {
sb.append("Decimal ");
map.put(column_name, "Decimal");
} else if (data_type.equalsIgnoreCase("DATE") ||
data_type.equalsIgnoreCase("TIME") ||
data_type.equalsIgnoreCase("YEAR") ||
data_type.equalsIgnoreCase("DATETIME") ||
data_type.equalsIgnoreCase("TIMESTAMP")) {
sb.append("Date ");
map.put(column_name, "Date");
} else {
sb.append("String ");
map.put(column_name, "String");
}
sb.append(column_name).append("; // ").append(column_comment).append("\n");
}
sb.append("\n");
// 生成get|set方法
processAllMethod(sb);
sb.append("}");
//FileOutputStream fos = new FileOutputStream();
// 打印文件
File file = new File(("/".equals(path.substring(path.length()-1))?path:(path+"/")) + entityname + ".java");
if (!file.exists()) {
file.createNewFile();
} else {
file.delete();
file.createNewFile();
}
BufferedWriter bw = new BufferedWriter(new FileWriter(file));
bw.write(sb.toString());
bw.flush();
bw.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成get,set
*
* @param sb
*/
private void processAllMethod(StringBuilder sb) {
// 遍历map,此为java8遍历
map.forEach((k, v) -> {
// 键值首字母大写
String m = k.substring(0, 1).toUpperCase() + k.substring(1);
// 生成set
sb//
.append("\tpublic void set")//
.append(m)//
.append("(")//
.append(v)//
.append(" ")//
.append(k)//
.append("){\n")//
.append("\t\tthis.")//
.append(k)//
.append(" = ")//
.append(k)//
.append(";\n")//
.append("\t}\n\n");//
// 生成get
sb//
.append("\tpublic ")//
.append(v)//
.append(" get")//
.append(m)//
.append("(){\n")//
.append("\t\treturn ")//
.append(k)//
.append(";\n")//
.append("\t}\n\n");//
});
}
public static void main(String[] args) {
new GenerateEntityMysql(
"jdbc:mysql://*.*.*.*/sxfp?characterEncoding=utf8&useSSL=false",
"****",
"****",
"****",
"****",
"****",
"****",
"E:/"
).generate();
}
}package com.sx.utils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Created by Administrator on 2018/2/27 0027.
*/
public class StringUtils {
/**
* 下划线转驼峰法
* @param line 源字符串
* @param smallCamel 大小驼峰,是否为小驼峰
* @return 转换后的字符串
*/
public static String underline2Camel(String line,boolean smallCamel){
if(line==null||"".equals(line)){
return "";
}
StringBuffer sb=new StringBuffer();
Pattern pattern= Pattern.compile("([A-Za-z\\d]+)(_)?");
Matcher matcher=pattern.matcher(line);
while(matcher.find()){
String word=matcher.group();
sb.append(smallCamel&&matcher.start()==0?Character.toLowerCase(word.charAt(0)):Character.toUpperCase(word.charAt(0)));
int index=word.lastIndexOf('_');
if(index>0){
sb.append(word.substring(1, index).toLowerCase());
}else{
sb.append(word.substring(1).toLowerCase());
}
}
return sb.toString();
}
/**
* 驼峰法转下划线
* @param line 源字符串
* @return 转换后的字符串
*/
public static String camel2Underline(String line){
if(line==null||"".equals(line)){
return "";
}
line=String.valueOf(line.charAt(0)).toUpperCase().concat(line.substring(1));
StringBuffer sb=new StringBuffer();
Pattern pattern=Pattern.compile("[A-Z]([a-z\\d]+)?");
Matcher matcher=pattern.matcher(line);
while(matcher.find()){
String word=matcher.group();
sb.append(word.toUpperCase());
sb.append(matcher.end()==line.length()?"":"_");
}
return sb.toString();
}
}