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根据数据表自动生成javaBean
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package fanshe; import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.ArrayList;
import java.util.List; /**
* 根据数据库表结构 自动生成java Bean
*
* @author DLHT 2016年3月4日下午5:00:28 AutoCreateClass.java DLHT
*/
public class AutoCreateBean { // mysql 驱动类
private static final String DRIVER = "com.mysql.jdbc.Driver"; // 数据库登录用户名
private static final String USER = "root"; // 数据库登录密码
private static final String PASSWORD = "20110725"; // 数据库连接地址
private static final String URL = "jdbc:mysql://localhost:3306/networkflow"; private static String tablename; 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.* /**
* 获取指定数据库中包含的表 TBlist
*
* @time 2016年3月4日下午5:54:52
* @packageName com.util
* @return 返回所有表名(将表名放到一个集合中)
* @throws Exception
*/
public List<String> TBlist() throws Exception {
// 访问数据库 采用 JDBC方式
Class.forName(DRIVER); Connection con = DriverManager.getConnection(URL, USER, PASSWORD); DatabaseMetaData md = con.getMetaData(); List<String> list = null; ResultSet rs = md.getTables(null, null, null, null);
if (rs != null) {
list = new ArrayList<String>();
}
while (rs.next()) {
// System.out.println("|表" + (i++) + ":" + rs.getString("TABLE_NAME"));
String tableName = rs.getString("TABLE_NAME");
list.add(tableName);
}
rs = null;
md = null;
con = null;
return list;
} public void GenEntity(List<String> TBlist, String packageName)throws Exception {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSetMetaData rsmd = null; // 访问数据库 采用 JDBC方式
Class.forName(DRIVER);
conn = DriverManager.getConnection(URL, USER, PASSWORD); for (int k = 0; k < TBlist.size(); k++) {
tablename = TBlist.get(k);
String strsql = "select * from " + tablename;
pstmt = conn.prepareStatement(strsql);
rsmd = pstmt.getMetaData();
int size = rsmd.getColumnCount();
// 共有多少列
colnames = new String[size];
colTypes = new String[size];
colSizes = new int[size];
for (int i = 0; i < rsmd.getColumnCount(); 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);
}
markerBean(initcap(tablename), parse(), packageName);
}
pstmt = null;
rsmd = null;
conn = null;
} /**
* 解析处理(生成实体类主体代码)
*/
private String parse() {
StringBuffer sb = new StringBuffer();
if (f_util) {
sb.append("import java.util.Date;\r\n");
}
if (f_sql) {
sb.append("import java.sql.*;\r\n\r\n\r\n");
}
sb.append("public class " + initcap(tablename) + " {\r\n");
processAllAttrs(sb);
processAllMethod(sb);
sb.append("}\r\n"); return sb.toString(); } /**
* 创建java 文件 将生成的属性 get/set 方法 保存到 文件中 markerBean
*
* @time 2015年9月29日下午4:15:22
* @packageName fanshe
* @param className
* 类名称
* @param content
* 类内容 包括属性 getset 方法
*/
public void markerBean(String className, String content, String packageName) {
String folder = System.getProperty("user.dir") + "/src/" + packageName + "/"; File file = new File(folder);
if (!file.exists()) {
file.mkdirs();
}
String fileName = folder + className + ".java"; try {
File newdao = new File(fileName);
FileWriter fw = new FileWriter(newdao);
fw.write("package\t" + packageName.replace("/", ".") + ";\r\n");
fw.write(content);
fw.flush();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
} /**
* 生成所有的方法
*
* @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("\t\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");
}
} /**
* 解析输出属性
*
* @return
*/
private void processAllAttrs(StringBuffer sb) {
for (int i = 0; i < colnames.length; i++) {
sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + ";\r\n"); }
} /**
* 把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);
} private String sqlType2JavaType(String sqlType) {
if (sqlType.equalsIgnoreCase("bit")) {
return "bool";
} 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")) {
return "double";
} else if (sqlType.equalsIgnoreCase("money")
|| sqlType.equalsIgnoreCase("smallmoney")) {
return "double";
} else if (sqlType.equalsIgnoreCase("varchar")
|| sqlType.equalsIgnoreCase("char")
|| sqlType.equalsIgnoreCase("nvarchar")
|| sqlType.equalsIgnoreCase("nchar")) {
return "String";
} else if (sqlType.equalsIgnoreCase("datetime")
||sqlType.equalsIgnoreCase("date")){
return "Date";
} else if (sqlType.equalsIgnoreCase("image")) {
return "Blob";
} else if (sqlType.equalsIgnoreCase("text")) {
return "Clob";
}
return null;
} public static void main(String[] args) throws Exception {
AutoCreateBean auto = new AutoCreateBean();
List<String> list = auto.TBlist();
auto.GenEntity(list, "com/bean"); } }
