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。
1 import com.alibaba.fastjson.JSON; 2 import com.alibaba.fastjson.JSONObject; 3 4 public class Digests { 5 private static final String APPKEY = "appkey"; 6 private static final String SECRET = "secret"; 7 private static final String OPENAPI_IP_PORT_HTTP = "ip"; 8 9 /** 10 * 分页获取数据。 11 */ 12 private static final String GET_DATA = "balabala"; 13 14 //md5加密 15 public static final String md5(String s) { 16 char[] hexDigits = { \'0\', \'1\', \'2\', \'3\', \'4\', \'5\', \'6\', \'7\', \'8\', \'9\', 17 \'a\', \'b\', \'c\', \'d\', \'e\', \'f\' }; 18 try { 19 MessageDigest mdTemp = MessageDigest.getInstance("MD5"); 20 try { 21 mdTemp.update(s.getBytes("UTF-8")); 22 } catch (UnsupportedEncodingException e) { 23 mdTemp.update(s.getBytes()); 24 } 25 byte[] md = mdTemp.digest(); 26 int j = md.length; 27 char[] str = new char[j * 2]; 28 int k = 0; 29 for (int i = 0; i < j; ++i) { 30 byte byte0 = md[i]; 31 str[(k++)] = hexDigits[(byte0 >>> 4 & 0xF)]; 32 str[(k++)] = hexDigits[(byte0 & 0xF)]; 33 } 34 return new String(str).toUpperCase(); 35 } catch (Exception e) { 36 } 37 return null; 38 } 39 40 //创建token 41 public static final String buildToken(String url, String paramJson, 42 String secret) { 43 String tempUrl = null; 44 if (url.contains("https://")) 45 tempUrl = url.substring("https://".length()); 46 else { 47 tempUrl = url.substring("http://".length()); 48 } 49 int index = tempUrl.indexOf("/"); 50 String URI = tempUrl.substring(index); 51 String[] ss = URI.split("\\?"); 52 if (ss.length > 1) { 53 return md5(ss[0] + ss[1] + secret); 54 } 55 return md5(ss[0] + paramJson + secret); 56 } 57 58 /** 59 * HTTP方式 分页获取数据。 60 */ 61 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) 62 String url = OPENAPI_IP_PORT_HTTP + GET_DATA ; 63 Map<String, Object> map = new HashMap<String, Object>(); 64 JSONObject jsonObject = JSONObject.parseObject(getDefaultUserUUID()); 65 String opUserUuid = jsonObject.getString("data"); 66 //System.out.println(opUserUuid); 67 map.put("appkey", APPKEY);// 设置APPKEY 68 map.put("time", System.currentTimeMillis());// 设置时间参数 69 map.put("pageNo", pageNo);// 设置当前页数 70 map.put("pageSize", 1000);// 设置一页多少条 71 map.put("opUserUuid", opUserUuid);// 设置操作用户UUID 72 map.put("startTime", startTime);// 设置开始时间 73 map.put("endTime", System.currentTimeMillis());// 设置结束时间 74 String params = JSON.toJSONString(map); 75 System.out.println(" ====== getData请求参数：【" + params + "】"); 76 String data = HttpClientSSLUtils.doPost( 77 url + "?token=" 78 + Digests.buildToken(url + "?" + params, null, SECRET), 79 params); 80 System.out.println(" ====== getData请求返回结果：【{" + data + "}】"); 81 82 return data; 83 } 84 }
从接口拿到数据后，下面就将数据存到数据库中：
1 import net.sf.json.JSONArray; 2 import net.sf.json.JSONObject; 3 4 public class SyncDataFn { 5 6 public int jxJson() throws Exception { 7 //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 8 9 // 创建Statement用于执行SQL语句 10 connection.setAutoCommit(false); 11 stmt = connection.createStatement(); 12 13 Long maxtime; 14 String sqlMaxtime = "select max(eventTime) as maxTime from data"; 15 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 16 if (rs1.next()) { // 该条数据存在 17 maxtime = rs1.getLong("maxTime"); 18 } else { 19 maxtime = (long) 0; 20 } 21 rs1.close(); 22 23 //得到json数据 24 String json = Digests.getDoorEventsHistory(1, maxtime); 25 JSONObject jsonObject = (JSONObject) JSONObject.fromObject(json); 26 String to = (String) jsonObject.getString("data"); 27 JSONObject toObject = JSONObject.fromObject(to); 28 double total = Integer.parseInt(toObject.getString("total")); 29 int page = (int) Math.ceil(total / 1000); 30 for (double k = 1; k <= page; k++) { 31 32 //得到json数据 33 String jsonTemp = Digests.getData(k, maxtime); 34 String data = JSONObject.fromObject(jsonTemp).getString("data"); 35 String list = JSONObject.fromObject(data).getString("list"); 36 JSONArray jsonArr = JSONArray.fromObject(list); 37 38 String dataName[] = new String[jsonArr.size()]; 39 String eventType[] = new String[jsonArr.size()]; 40 String eventTime[] = new String[jsonArr.size()]; 41 String eventName[] = new String[jsonArr.size()]; 42 String cardNo[] = new String[jsonArr.size()]; 43 String personId[] = new String[jsonArr.size()]; 44 String personName[] = new String[jsonArr.size()]; 45 String deptName[] = new String[jsonArr.size()]; 46 47 for (int i = 0; i < jsonArr.size(); i++) { 48 49 dataName[i] = jsonArr.getJSONObject(i).getString("dataName"); 50 eventType[i] = jsonArr.getJSONObject(i).getString("eventType"); 51 eventTime[i] = jsonArr.getJSONObject(i).getString("eventTime"); 52 eventName[i] = jsonArr.getJSONObject(i).getString("eventName"); 53 cardNo[i] = jsonArr.getJSONObject(i).getString("cardNo"); 54 personId[i] = jsonArr.getJSONObject(i).getString("personId"); 55 personName[i] = jsonArr.getJSONObject(i).getString("personName"); 56 deptName[i] = jsonArr.getJSONObject(i).getString("deptName"); 57 //如果得到的字段有null的，做相应处理 58 cardNo[i] = (cardNo[i] == "null") ? null + "," : "\'" 59 + cardNo[i] + "\'"; 60 personName[i] = (personName[i] == "null") ? null + "," : "\'" 61 + personName[i] + "\',"; 62 + deptUuid[i] + "\',"; 63 deptName[i] = (deptName[i] == "null") ? null + "," : "\'" 64 + deptName[i] + "\',"; 65 66 strSQL = "INSERT into door_events_history values(AUTOID_SEQ.NEXTVAL," 67 + "\'"+ dataName[i]+ "\',\'"+ eventType[i]+ ","+ eventTime[i]+ ",\'"+ eventName[i]+ "\',"+ cardNo[i]+ ","+ personId[i]+ ","+ personName[i]+ deptName[i] + ")"; 68 69 try { 70 String sql = "select cardNo,eventTime from data where cardNo = " 71 + cardNo[i] 72 + " and eventTime = " 73 + eventTime[i]; 74 ResultSet rs = stmt.executeQuery(sql); // 查询数据库看数据是否已经存在 75 if (rs.next()) { // 该条数据已经存在 76 } else { 77 stmt.executeUpdate(strSQL); 78 count++; 79 } 80 rs.close(); 81 } catch (Exception e) { 82 e.printStackTrace(); 83 } finally { 84 85 } 86 } 87 88 connection.commit(); 89 } // for结束 90 91 // 先关闭Statement 92 if (stmt != null) 93 try { 94 stmt.close(); 95 } catch (SQLException e) { 96 e.printStackTrace(); 97 } 98 // 后关闭Connection 99 if (connection != null) 100 try { 101 connection.close(); 102 } catch (SQLException e) { 103 e.printStackTrace(); 104 } 105 log.info("当前时间===" + new Date()); 106 log.info("同步结束"); 107 log.info("共更新了"+ count + "条数据"); 108 return count; 109 } 110 }
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。