根据Mysql数据库名生成指定库下所有表的实体类

package cn.ssm.pojo;


import java.io.*;
import java.sql.*;
import java.util.Date;


/**
 * 能够根据Mysql数据库名生成指定库下所有表的实体类
 */
public class GenEntityMysql {


private String packageOutPath = "main.java.cn.ssm.pojo";// 指定实体生成所在包的路径
private String packageOutName = "cn.ssm.pojo";// 指定实体生成所在包的名字
private String authorName = "沐风";// 作者名字
private String tablename = null;// 表名
private static String dbname = "appinfodb";// 库名
private String[] colnames; // 列名数组
private String[] colTypes; // 列名类型数组
private int[] colSizes; // 列名大小数组
private boolean f_util = false; // 是否需要导入包java.util.*
private boolean f_sql = false; // 是否需要导入包java.sql.*
// com.mysql.jdbc.Driver jdbc:mysql://localhost:3306/easybuy root 123456
// 数据库连接
private static final String URL = "jdbc:mysql://localhost:3306/" + dbname;
private static final String NAME = "root";
private static final String PASS = "123456";
private static final String DRIVER = "com.mysql.jdbc.Driver";


/*
* 构造函数
*/
public GenEntityMysql() {
// 创建连接
Connection con = null;
// 查要生成实体类的表
String sql = "";
PreparedStatement pStemt = null;
ResultSetMetaData rsmd = null;
// 结果集
ResultSet rs = null;
try {
try {
Class.forName(DRIVER);
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
con = DriverManager.getConnection(URL, NAME, PASS);
// 循环读取当前库中的所有表名
String str = "SELECT table_name FROM information_schema.tables WHERE table_schema='" + dbname
+ "' AND table_type='base table'";
pStemt = con.prepareStatement(str);
rs = pStemt.executeQuery();
while (rs.next()) {
tablename = rs.getString("table_name");
sql = "select * from " + tablename;
pStemt = con.prepareStatement(sql);
rsmd = pStemt.getMetaData();
int size = rsmd.getColumnCount(); // 统计列
colnames = new String[size];
colTypes = new String[size];
colSizes = new int[size];
for (int i = 0; i < size; i++) {
colnames[i] = rsmd.getColumnName(i + 1);
colTypes[i] = rsmd.getColumnTypeName(i + 1);


if (colTypes[i].equalsIgnoreCase("datetime")) {
f_util = true;
}
if (colTypes[i].equalsIgnoreCase("image") || colTypes[i].equalsIgnoreCase("text")) {
f_sql = true;
}
colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
}


String content = parse(colnames, colTypes, colSizes);


try {
File directory = new File("");
// System.out.println("绝对路径："+directory.getAbsolutePath());
// System.out.println("相对路径："+directory.getCanonicalPath());
String path = this.getClass().getResource("").getPath();
String outputPath = directory.getAbsolutePath() + "/src/" + this.packageOutPath.replace(".", "/")
+ "/" + initcap(tablename) + ".java";
System.out.println(outputPath);
FileWriter fw = new FileWriter(outputPath);
PrintWriter pw = new PrintWriter(fw);
pw.println(content);
pw.flush();
pw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (rs!=null&&!rs.isClosed()) {
rs.close();
}
if (pStemt!=null&&!pStemt.isClosed()) {
pStemt.close();
}
if (con!=null&&!con.isClosed()) {
con.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}


/**
* 功能：生成实体类主体代码
* 
* @param colnames
* @param colTypes
* @param colSizes
* @return
*/
private String parse(String[] colnames, String[] colTypes, int[] colSizes) {
StringBuffer sb = new StringBuffer();
sb.append("package " + this.packageOutName + ";\r\n");
// 判断是否导入工具包
if (f_util) {
sb.append("import java.util.Date;\r\n");
}
if (f_sql) {
sb.append("import java.sql.*;\r\n");
}
sb.append("\r\n");
// 注释部分
sb.append("   /**\r\n");
sb.append("    * " + tablename + " 实体类\r\n");
sb.append("    * " + new Date() + " " + this.authorName + "\r\n");
sb.append("    */ \r\n");
// 实体部分
sb.append("\r\n\r\npublic class " + initcap(tablename) + "{\r\n");
processAllAttrs(sb);// 属性
processAllMethod(sb);// get set方法
sb.append("}\r\n");
// System.out.println(sb.toString());
return sb.toString();
}


/**
* 功能：生成所有属性
* 
* @param sb
*/
private void processAllAttrs(StringBuffer sb) {
for (int i = 0; i < colnames.length; i++) {
sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + ";\r\n");
}


}


/**
* 功能：生成所有方法
* 
* @param sb
*/
private void processAllMethod(StringBuffer sb) {


for (int i = 0; i < colnames.length; i++) {
sb.append("\tpublic void set" + initcap(colnames[i]) + "(" + sqlType2JavaType(colTypes[i]) + " "
+ colnames[i] + "){\r\n");
sb.append("\tthis." + colnames[i] + "=" + colnames[i] + ";\r\n");
sb.append("\t}\r\n");
sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get" + initcap(colnames[i]) + "(){\r\n");
sb.append("\t\treturn " + colnames[i] + ";\r\n");
sb.append("\t}\r\n");
}


}


/**
* 功能：将输入字符串的首字母改成大写
* 
* @param str
* @return
*/
private String initcap(String str) {


char[] ch = str.toCharArray();
if (ch[0] >= 'a' && ch[0] <= 'z') {
ch[0] = (char) (ch[0] - 32);
}


return new String(ch);
}


/**
* 功能：获得列的数据类型
* 
* @param sqlType
* @return
*/
private String sqlType2JavaType(String sqlType) {


if (sqlType.equalsIgnoreCase("bit")) {
return "boolean";
} else if (sqlType.equalsIgnoreCase("tinyint")) {
return "byte";
} else if (sqlType.equalsIgnoreCase("smallint")) {
return "short";
} else if (sqlType.equalsIgnoreCase("int")) {
return "int";
} else if (sqlType.equalsIgnoreCase("bigint")) {
return "long";
} else if (sqlType.equalsIgnoreCase("float")) {
return "float";
} else if (sqlType.equalsIgnoreCase("decimal") || sqlType.equalsIgnoreCase("numeric")
|| sqlType.equalsIgnoreCase("real") || sqlType.equalsIgnoreCase("money")
|| sqlType.equalsIgnoreCase("smallmoney")) {
return "double";
} else if (sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char")
|| sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")
|| sqlType.equalsIgnoreCase("text")) {
return "String";
} else if (sqlType.equalsIgnoreCase("datetime")) {
return "Date";
} else if (sqlType.equalsIgnoreCase("image")) {
return "Blod";
} else if (sqlType.equalsIgnoreCase("date")) {
return "Date";
}


return null;
}


/**
* 出口 TODO
* 
* @param args
*/
public static void main(String[] args) {


new GenEntityMysql();


}


}