【Java框架型项目从入门到装逼】第十节 simple-jdbc源码@慕课网原创_慕课网

这一节就简单贴一下simple-jdbc框架的源码，其实也没多少东西，都很简单的啦。这个小框架就是对之前 文章发布系统博客 中封装的jdbc工具类，进行的一个强化。

目录结构：

1、DBCP_source

package com.simple.core;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.commons.dbcp.BasicDataSourceFactory;

public class DBCP_source {
    private static DataSource ds = null;

    static {
        try {
            InputStream e = DBCP_source.class.getClassLoader().getResourceAsStream("dbcpconfig.properties");
            Properties prop = new Properties();
            prop.load(e);
            ds = BasicDataSourceFactory.createDataSource(prop);
        } catch (Exception arg1) {
            throw new ExceptionInInitializerError(arg1);
        }
    }

    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    public static void release(Connection conn, Statement st, ResultSet rs) {
        if (rs != null) {
            try {
                rs.close();
            } catch (Exception arg5) {
                arg5.printStackTrace();
            }

            rs = null;
        }

        if (st != null) {
            try {
                st.close();
            } catch (Exception arg4) {
                arg4.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (Exception arg3) {
                arg3.printStackTrace();
            }
        }

    }

    public static void main(String[] args) throws SQLException {
        System.out.println(getConnection());
    }
}

2、PropertiesUtil

package com.simple.core;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class PropertiesUtil {
    public static String getValue(String propertyPath, String key) {
        Properties prop = new Properties();
        InputStream in = (new PropertiesUtil()).getClass().getResourceAsStream(propertyPath);

        try {
            prop.load(in);
        } catch (IOException arg4) {
            arg4.printStackTrace();
        }

        return (String) prop.get(key);
    }
}

3、StringUtils

package com.simple.core;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.UUID;

public class StringUtils {
    public static String firstCharacterLowerCase(String str) {
        String firstCharacter = String.valueOf(str.charAt(0)).toLowerCase();
        return firstCharacter + str.substring(1, str.length());
    }

    public static Object[] extendArray(Object[] array, Object... objects) {
        Object[] newArray = null;
        if (array.length < 1) {
            return objects;
        } else {
            newArray = new Object[array.length + objects.length];

            int i;
            for (i = 0; i < array.length; ++i) {
                newArray[i] = array[i];
            }

            for (i = 0; i < objects.length; ++i) {
                newArray[array.length + i] = objects[i];
            }

            return newArray;
        }
    }

    public static String getUUID() {
        return UUID.randomUUID().toString();
    }

    public static Object[] listToObjectArray(List<Object> list) {
        Object[] objArr = new Object[list.size()];

        for (int i = 0; i < objArr.length; ++i) {
            objArr[i] = list.get(i);
        }

        return objArr;
    }

    public static String nullToEmpty(Object o) {
        return o != null ? o.toString() : "";
    }

    public static String join(List<String> list) {
        String str = "";

        for (int i = 0; i < list.size(); ++i) {
            str = str + (String) list.get(i) + ",";
        }

        return str.substring(0, str.length() - 1);
    }

    public static boolean isEmpty(Object o) {
        String str = nullToEmpty(o);
        return str == null || str.equals("") || str.matches("\\s*");
    }

    public static boolean isNotEmpty(Object o) {
        return !isEmpty(o);
    }

    public static String defaultValue(String content, String defaultValue) {
        return isEmpty(content) ? defaultValue : content;
    }

    public static String columnToProperty(String column) {
        if (isEmpty(column)) {
            return "";
        } else {
            Byte length = Byte.valueOf((byte) column.length());
            StringBuilder sb = new StringBuilder(length.byteValue());
            boolean i = false;

            for (int j = 0; j < length.byteValue(); ++j) {
                if (column.charAt(j) != 95) {
                    sb.append(column.charAt(j));
                } else {
                    while (column.charAt(j + 1) == 95) {
                        ++j;
                    }

                    StringBuilder arg10000 = new StringBuilder();
                    ++j;
                    sb.append(arg10000.append(column.charAt(j)).toString().toUpperCase());
                }
            }

            return sb.toString();
        }
    }

    public static String upperCaseFirstCharacter(String str) {
        StringBuilder sb = new StringBuilder();
        char[] arr = str.toCharArray();

        for (int i = 0; i < arr.length; ++i) {
            if (i == 0) {
                sb.append(String.valueOf(arr[i]).toUpperCase());
            } else {
                sb.append(String.valueOf(arr[i]));
            }
        }

        return sb.toString();
    }

    public static String formatDate(Date date, String format) {
        String result = "";
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        if (date != null) {
            result = sdf.format(date);
        }

        return result;
    }

    public static Date formatString(String str, String format) throws Exception {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.parse(str);
    }

    public static String getCurrentDateForMysql() {
        return formatDate(new Date(), "yyyy-MM-dd hh:mm:ss");
    }

    public static String getCurrentDateForMysql24() {
        return formatDate(new Date(), "yyyy-MM-dd HH:mm:ss");
    }
}

4、SimpleDao

package com.simple.dao;

import com.simple.core.DBCP_source;
import com.simple.core.StringUtils;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class SimpleDao {
    private Connection connection = this.getConnection();

    public Connection getConnection() {
        try {
            return this.connection != null ? this.connection : (this.connection = DBCP_source.getConnection());
        } catch (SQLException arg1) {
            arg1.printStackTrace();
            return null;
        }
    }

    public void closeConnection(Connection connection, PreparedStatement statement, ResultSet rs) {
        try {
            if (rs != null) {
                rs.close();
            }

            if (statement != null) {
                statement.close();
            }

            if (connection != null) {
                connection.close();
            }
        } catch (Exception arg4) {
            arg4.fillInStackTrace();
        }

    }

    public JSONObject queryForJsonObject(String sql, Object... objects) {
        Map map = this.queryForMap(sql, objects);
        return map == null ? null : JSONObject.fromObject(map);
    }

    public JSONArray queryForJsonArray(String sql, Object... objects) {
        return JSONArray.fromObject(this.queryForList(sql, objects));
    }

    public List<Map<String, Object>> queryForList(String sql, Object... objects) {
        ArrayList result = new ArrayList();
        PreparedStatement statement = null;
        ResultSet rs = null;

        try {
            statement = this.connection.prepareStatement(sql);

            for (int e = 0; e < objects.length; ++e) {
                statement.setObject(e + 1, objects[e]);
            }

            rs = statement.executeQuery();

            while (rs.next()) {
                ResultSetMetaData arg10 = rs.getMetaData();
                int count = arg10.getColumnCount();
                HashMap map = new HashMap();

                for (int i = 0; i < count; ++i) {
                    map.put(arg10.getColumnName(i + 1), rs.getObject(arg10.getColumnName(i + 1)));
                }

                result.add(map);
            }
        } catch (SQLException arg9) {
            arg9.printStackTrace();
        }

        return result;
    }

    public Map<String, Object> queryForMap(String sql, Object... objects) {
        new HashMap();
        List list = this.queryForList(sql, objects);
        if (list.size() != 1) {
            return null;
        } else {
            Map result = (Map) list.get(0);
            return result;
        }
    }

    public <T> T queryForBean(String sql, Class clazz, Object... objects) {
        Object obj = null;
        Map map = null;
        Field field = null;

        try {
            obj = clazz.newInstance();
            map = this.queryForMap(sql, objects);
        } catch (IllegalAccessException | InstantiationException arg20) {
            arg20.printStackTrace();
        }

        if (map == null) {
            return null;
        } else {
            Iterator arg7 = map.keySet().iterator();

            while (arg7.hasNext()) {
                String columnName = (String) arg7.next();
                Method method = null;
                String propertyName = StringUtils.columnToProperty(columnName);

                try {
                    field = clazz.getDeclaredField(propertyName);
                } catch (NoSuchFieldException arg18) {
                    arg18.printStackTrace();
                } catch (SecurityException arg19) {
                    arg19.printStackTrace();
                }

                String fieldType = field.toString().split(" ")[1];
                Object value = map.get(columnName);
                if (value != null) {
                    String setMethodName = "set" + StringUtils.upperCaseFirstCharacter(propertyName);

                    try {
                        String e = value.getClass().getName();
                        if (!fieldType.equalsIgnoreCase(e)) {
                            if (fieldType.equalsIgnoreCase("java.lang.Integer")) {
                                value = Integer.valueOf(Integer.parseInt(String.valueOf(value)));
                            } else if (fieldType.equalsIgnoreCase("java.lang.String")) {
                                value = String.valueOf(value);
                            } else if (fieldType.equalsIgnoreCase("java.util.Date")) {
                                e = "java.util.Date";
                                String dateStr = String.valueOf(value);
                                Timestamp ts = Timestamp.valueOf(dateStr);
                                Date date = new Date(ts.getTime());
                                value = date;
                            }
                        }

                        method = clazz.getDeclaredMethod(setMethodName, new Class[]{Class.forName(fieldType)});
                        method.invoke(obj, new Object[]{value});
                    } catch (Exception arg17) {
                        arg17.printStackTrace();
                    }
                }
            }

            return obj;
        }
    }

    public List<String> getColumeList(String table_schema, String table_name) {
        String sql_forColumnName = "select COLUMN_NAME from information_schema.columns where table_schema = ? and table_name = ?";
        List cloumnList = this.queryForcloumnList(sql_forColumnName, "COLUMN_NAME",
                new Object[]{table_schema, table_name});
        return cloumnList;
    }

    public int update(String table_schema, String table_name, Map<String, Object> paramMapper, String keyColumn) {
        List cloumnList = this.getColumeList(table_schema, table_name);
        ArrayList listValues = new ArrayList();
        if (cloumnList.size() < 1) {
            try {
                throw new Exception("这张表没有一个字段或者表不存在！");
            } catch (Exception arg10) {
                arg10.printStackTrace();
                return 0;
            }
        } else if (paramMapper == null) {
            try {
                throw new Exception("需要修改的map不能为空！");
            } catch (Exception arg11) {
                arg11.printStackTrace();
                return 0;
            }
        } else if (keyColumn != null && paramMapper.get(keyColumn) != null) {
            String sql_forUpdate = "update " + table_name + " set ";
            byte count = 0;
            Iterator arg9 = cloumnList.iterator();

            while (arg9.hasNext()) {
                String rs = (String) arg9.next();
                if (!rs.equals(keyColumn) && StringUtils.isNotEmpty(paramMapper.get(rs))) {
                    ++count;
                    listValues.add(paramMapper.get(rs));
                    sql_forUpdate = sql_forUpdate + rs + "=" + "?,";
                }
            }

            if (count == 0) {
                try {
                    throw new Exception("请核实需要保存的字段！");
                } catch (Exception arg12) {
                    arg12.printStackTrace();
                    return 0;
                }
            } else {
                sql_forUpdate = sql_forUpdate.substring(0, sql_forUpdate.length() - 1);
                sql_forUpdate = sql_forUpdate + " where " + keyColumn + "=?";
                listValues.add(paramMapper.get(keyColumn));
                System.out.println(sql_forUpdate);
                int arg14 = this.update(sql_forUpdate, StringUtils.listToObjectArray(listValues));
                return arg14;
            }
        } else {
            try {
                throw new Exception("请设置修改行的匹配列！");
            } catch (Exception arg13) {
                arg13.printStackTrace();
                return 0;
            }
        }
    }

    public int save(String table_schema, String table_name, Map<String, Object> paramMapper) {
        List cloumnList = this.getColumeList(table_schema, table_name);
        ArrayList listValues = new ArrayList();
        if (cloumnList.size() < 1) {
            try {
                throw new Exception("这张表没有一个字段或者表不存在！");
            } catch (Exception arg9) {
                arg9.printStackTrace();
                return 0;
            }
        } else if (paramMapper == null) {
            try {
                throw new Exception("需要保存的map不能为空！");
            } catch (Exception arg10) {
                arg10.printStackTrace();
                return 0;
            }
        } else {
            String sql_forInsert = "insert into " + table_name + "(";
            sql_forInsert = sql_forInsert + StringUtils.join(cloumnList) + ") values (";
            byte count = 0;
            Iterator arg8 = cloumnList.iterator();

            while (arg8.hasNext()) {
                String rs = (String) arg8.next();
                if (StringUtils.isNotEmpty(paramMapper.get(rs))) {
                    ++count;
                    listValues.add(paramMapper.get(rs));
                    sql_forInsert = sql_forInsert + "?,";
                } else {
                    sql_forInsert = sql_forInsert + "NULL,";
                }
            }

            if (count == 0) {
                try {
                    throw new Exception("请核实需要保存的字段！");
                } catch (Exception arg11) {
                    arg11.printStackTrace();
                    return 0;
                }
            } else {
                sql_forInsert = sql_forInsert.substring(0, sql_forInsert.length() - 1) + ")";
                int arg12 = this.update(sql_forInsert, StringUtils.listToObjectArray(listValues));
                return arg12;
            }
        }
    }

    public List<String> queryForcloumnList(String sql, String columnName, Object... objects) {
        JSONArray jsonArray = this.queryForJsonArray(sql, objects);
        ArrayList resultList = new ArrayList();

        for (int i = 0; i < jsonArray.size(); ++i) {
            JSONObject json = (JSONObject) jsonArray.get(i);
            resultList.add(json.getString(columnName));
        }

        return resultList;
    }

    public String queryForString(String sql, Object... objects) {
        JSONObject jsonObject = this.queryForJsonObject(sql, objects);
        Iterator sIterator = jsonObject.keys();
        if (sIterator.hasNext()) {
            String key = (String) sIterator.next();
            String value = jsonObject.getString(key);
            return value;
        } else {
            return null;
        }
    }

    public int queryForInt(String sql, Object... objects) {
        return Integer.parseInt(this.queryForString(sql, objects));
    }

    public long queryForLong(String sql, Object... objects) {
        return Long.parseLong(this.queryForString(sql, objects));
    }

    public int update(String sql, Object... objects) {
        PreparedStatement statement = null;

        try {
            statement = this.connection.prepareStatement(sql);

            for (int e = 0; e < objects.length; ++e) {
                statement.setObject(e + 1, objects[e]);
            }

            return statement.executeUpdate();
        } catch (SQLException arg4) {
            arg4.printStackTrace();
            return 0;
        }
    }

    public long getTotal(String sql, Object... objects) {
        sql = "select count(1) from (" + sql + ") t";
        long total = this.queryForLong(sql, objects);
        return total;
    }

    public Map<String, Object> queryForPage(String sql, int pageIndex, int pageSize, Object... objects) {
        HashMap pageMap = new HashMap();
        int startIndex = (pageIndex - 1) * pageSize;
        long total = this.getTotal(sql, objects);
        pageMap.put("total", Long.valueOf(total));
        sql = sql + " limit ?,?";
        JSONArray rows = this.queryForJsonArray(sql,
                StringUtils.extendArray(objects, new Object[]{Integer.valueOf(startIndex), Integer.valueOf(pageSize)}));
        pageMap.put("rows", rows);
        System.out.println(rows.size());
        return pageMap;
    }
}

真正的源码我貌似不小心删掉了，这个是jar包反编译出来的，所以有些变量名比较奇怪。好吧，小细节不用在意。。。

【Java框架型项目从入门到装逼】第十节 simple-jdbc源码原创

1、DBCP_source

2、PropertiesUtil

3、StringUtils

4、SimpleDao