Java之通过接口获取数据并用JDBC存储到数据库中

最近做数据同步功能，从接口获取数据然后存到数据库中以便后续对数据进行相关操作，下面就贴一下相关代码。

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

public class Digests {
    private static final String APPKEY = "appkey";
    private static final String SECRET = "secret";
    private static final String OPENAPI_IP_PORT_HTTP = "ip";
    
    /**
     * 分页获取数据。
     */
    private static final String GET_DATA = "balabala";

    //md5加密
    public static final String md5(String s) {
        char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            try {
                mdTemp.update(s.getBytes("UTF-8"));
            } catch (UnsupportedEncodingException e) {
                mdTemp.update(s.getBytes());
            }
            byte[] md = mdTemp.digest();
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; ++i) {
                byte byte0 = md[i];
                str[(k++)] = hexDigits[(byte0 >>> 4 & 0xF)];
                str[(k++)] = hexDigits[(byte0 & 0xF)];
            }
            return new String(str).toUpperCase();
        } catch (Exception e) {
        }
        return null;
    }

    //创建token
    public static final String buildToken(String url, String paramJson,
            String secret) {
        String tempUrl = null;
        if (url.contains("https://"))
            tempUrl = url.substring("https://".length());
        else {
            tempUrl = url.substring("http://".length());
        }
        int index = tempUrl.indexOf("/");
        String URI = tempUrl.substring(index);
        String[] ss = URI.split("\\?");
        if (ss.length > 1) {
            return md5(ss[0] + ss[1] + secret);
        }
        return md5(ss[0] + paramJson + secret);
    }

    /**
     * HTTP方式 分页获取数据。
     */
    public static String getData(double pageNo, Long startTime) throws Exception {  //第一个参数是当前页数，第二个参数是请求数据的开始时间(为毫秒数)
        String url = OPENAPI_IP_PORT_HTTP + GET_DATA ;
        Map<String, Object> map = new HashMap<String, Object>();
        JSONObject jsonObject = JSONObject.parseObject(getDefaultUserUUID());
        String opUserUuid = jsonObject.getString("data");
        //System.out.println(opUserUuid);
        map.put("appkey", APPKEY);// 设置APPKEY
        map.put("time", System.currentTimeMillis());// 设置时间参数
        map.put("pageNo", pageNo);// 设置当前页数
        map.put("pageSize", 1000);// 设置一页多少条
        map.put("opUserUuid", opUserUuid);// 设置操作用户UUID
        map.put("startTime", startTime);// 设置开始时间
        map.put("endTime", System.currentTimeMillis());// 设置结束时间
        String params = JSON.toJSONString(map);
        System.out.println(" ====== getData请求参数：【" + params + "】");
        String data = HttpClientSSLUtils.doPost(
                url + "?token="
                        + Digests.buildToken(url + "?" + params, null, SECRET),
                params);
        System.out.println(" ====== getData请求返回结果：【{" + data + "}】");

        return data;
    }
}

 

从接口拿到数据后，下面就将数据存到数据库中：

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class SyncDataFn {
    
    public int jxJson() throws Exception {
        //此处省略数据库连接相关语句，具体见上一篇properties配置文件连接数据库

        // 创建Statement用于执行SQL语句
        connection.setAutoCommit(false);
        stmt = connection.createStatement();
        
        Long maxtime;
        String sqlMaxtime = "select max(eventTime) as maxTime from data";
        ResultSet rs1 = stmt.executeQuery(sqlMaxtime); // 查询数据库看数据是否已经存在，表示只更新没有更新进来的数据
        if (rs1.next()) { // 该条数据存在
            maxtime = rs1.getLong("maxTime");
        } else {
            maxtime = (long) 0;
        }
        rs1.close();
        
        //得到json数据
        String json = Digests.getDoorEventsHistory(1, maxtime);
        JSONObject jsonObject = (JSONObject) JSONObject.fromObject(json);
        String to = (String) jsonObject.getString("data");
        JSONObject toObject = JSONObject.fromObject(to);
        double total = Integer.parseInt(toObject.getString("total"));
        int page = (int) Math.ceil(total / 1000);
        for (double k = 1; k <= page; k++) {

            //得到json数据
            String jsonTemp = Digests.getData(k, maxtime);
            String data = JSONObject.fromObject(jsonTemp).getString("data");
            String list = JSONObject.fromObject(data).getString("list");
            JSONArray jsonArr = JSONArray.fromObject(list);

            String dataName[] = new String[jsonArr.size()];
            String eventType[] = new String[jsonArr.size()];
            String eventTime[] = new String[jsonArr.size()];
            String eventName[] = new String[jsonArr.size()];
            String cardNo[] = new String[jsonArr.size()];
            String personId[] = new String[jsonArr.size()];
            String personName[] = new String[jsonArr.size()];
            String deptName[] = new String[jsonArr.size()];
            
            for (int i = 0; i < jsonArr.size(); i++) {

                dataName[i] = jsonArr.getJSONObject(i).getString("dataName");
                eventType[i] = jsonArr.getJSONObject(i).getString("eventType");
                eventTime[i] = jsonArr.getJSONObject(i).getString("eventTime");
                eventName[i] = jsonArr.getJSONObject(i).getString("eventName");
                cardNo[i] = jsonArr.getJSONObject(i).getString("cardNo");
                personId[i] = jsonArr.getJSONObject(i).getString("personId");
                personName[i] = jsonArr.getJSONObject(i).getString("personName");
                deptName[i] = jsonArr.getJSONObject(i).getString("deptName");
                //如果得到的字段有null的，做相应处理
                cardNo[i] = (cardNo[i] == "null") ? null + "," : "'"
                        + cardNo[i] + "'";
                personName[i] = (personName[i] == "null") ? null + "," : "'"
                        + personName[i] + "',";
                        + deptUuid[i] + "',";
                deptName[i] = (deptName[i] == "null") ? null + "," : "'"
                        + deptName[i] + "',";

                strSQL = "INSERT into door_events_history values(AUTOID_SEQ.NEXTVAL,"
                        + "'"+ dataName[i]+ "','"+ eventType[i]+ ","+ eventTime[i]+ ",'"+ eventName[i]+ "',"+ cardNo[i]+ ","+ personId[i]+ ","+ personName[i]+ deptName[i] + ")";

                try {
                    String sql = "select cardNo,eventTime from data where cardNo = "
                            + cardNo[i]
                            + " and eventTime = "
                            + eventTime[i];
                    ResultSet rs = stmt.executeQuery(sql); // 查询数据库看数据是否已经存在
                    if (rs.next()) { // 该条数据已经存在
                    } else {
                        stmt.executeUpdate(strSQL);
                        count++;
                    }
                    rs.close();
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {

                }
            }

            connection.commit();
        } // for结束
        
        // 先关闭Statement
        if (stmt != null)
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        // 后关闭Connection
        if (connection != null)
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        log.info("当前时间===" + new Date());
        log.info("同步结束");
        log.info("共更新了"+ count + "条数据");
        return count;
    }
}

 

其中AUTOID_SEQ.NEXTVAL为Oracle中的自增序列

 

 至此，数据已经同步到指定的数据库中啦，打完收工！

 

注意：拼接sql的时候一定要按照字段类型来看是否增加单引号，否则插入数据会报错。