07-项目训练_项目搭建与工具整理

目录

一，项目搭建与工具整理

1，引入数据库相关工具包和工具类

2，编写其他工具类

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一，项目搭建与工具整理

1，引入数据库相关工具包和工具类

package com.xxy.util;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import javax.xml.transform.Result;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class DruidUtil {

    private static DataSource ds;
    static{
        try {
            Properties ppt = new Properties();
            ppt.load(DruidUtil.class.getClassLoader().getResourceAsStream("druid.properties"));
            ds = DruidDataSourceFactory.createDataSource(ppt);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    /**
     * 从连接池中取出一个连接给用户
     * @return
     */
    public static Connection getConnection(){
        try {
            return ds.getConnection();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return null;
    }


    public static void close(Connection conn, Statement state, ResultSet rs){
        try {
            rs.close();
        } catch (Exception throwables) {
            throwables.printStackTrace();
        }
        try {
            state.close();
        } catch (Exception throwables) {
            throwables.printStackTrace();
        }
        try {
            conn.close();
        } catch (Exception throwables) {
            throwables.printStackTrace();
        }
    }
}

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf-8
username=root
password=2017217905
initialSize=5
# 最大连接池数量
maxActive=10
# 最小连接池数量
minIdle=5
# 获取连接时最大等待时间，单位毫秒
maxWait=5000

2，编写其他工具类

DateFormatUtil

package com.xxy.util;

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

public class DateFormatUtil {
    private static SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    public static String format(Date date) {
        return format.format(date);
    }
}

bean目录中创建Message类

package com.xxy.bean;

public class Message {
    // {status:0, result:"", data:{}}

    // 状态码 0成功 -1失败
    private int status;
    // 消息内容
    private String result;
    // 消息携带的数据
    private Object data;

    public Message(int status, String result, Object data) {
        this.status = status;
        this.result = result;
        this.data = data;
    }

    public Message() {
    }

    public Message(int status) {
        this.status = status;
    }

    public Message(String result) {
        this.result = result;
    }

    public Message(int status, String result) {
        this.status = status;
        this.result = result;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }
}

JSONUtil

需要在lib中引入两个工具包：

package com.xxy.util;

import com.google.gson.Gson;

public class JSONUtil {
    private static Gson g;

    public static String toJSON(Object obj) {
        return g.toJson(obj);
    }
}