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实例说明ModBus的使用方法:
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主要用于JAVA 对ModBus以及串口的通讯操作
1,Test类用于接收数采仪数据,然后核对其CRC校验是否正确,不正确便丢弃,不作任何操作,正确就查找其设备号对应哪个站点,以及其检测指标。然后到DB中查找实时检测值,若未有实时数据可用本实例中的随机数代替,然后保存发送数据到数据库中。得到值后通过CRC16得到其校验码组成其要发送的字节,发送完毕。
2,主要涉及到的类有3个
DB.java 用户得到实时数据,保存发送数据到数据库中
Test.java 用户接收数采仪值,通过com串口发送到数采仪
ModBus的CRC16校验法
数采仪是参照国际HJ/T212-2005
CRC.javal类代码如下:
public class CRC16 {
static final String HEXES = "0123456789ABCDEF";
byte uchCRCHi = (byte) 0xFF;
byte uchCRCLo = (byte) 0xFF;
private static byte[] auchCRCHi = { 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0,
(byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x01,
(byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1,
(byte) 0x81, (byte) 0x40, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x01,
(byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x01, (byte) 0xC0,
(byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0,
(byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x00, (byte) 0xC1,
(byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80,
(byte) 0x41, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x01,
(byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1,
(byte) 0x81, (byte) 0x40, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x00, (byte) 0xC1,
(byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80,
(byte) 0x41, (byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x01,
(byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1,
(byte) 0x81, (byte) 0x40, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0,
(byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0,
(byte) 0x80, (byte) 0x41, (byte) 0x01, (byte) 0xC0, (byte) 0x80,
(byte) 0x41, (byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x00, (byte) 0xC1,
(byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80,
(byte) 0x41, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x00, (byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40, (byte) 0x01, (byte) 0xC0,
(byte) 0x80, (byte) 0x41, (byte) 0x00, (byte) 0xC1, (byte) 0x81,
(byte) 0x40, (byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41,
(byte) 0x01, (byte) 0xC0, (byte) 0x80, (byte) 0x41, (byte) 0x00,
(byte) 0xC1, (byte) 0x81, (byte) 0x40 };
private static byte[] auchCRCLo = { (byte) 0x00, (byte) 0xC0, (byte) 0xC1,
(byte) 0x01, (byte) 0xC3, (byte) 0x03, (byte) 0x02, (byte) 0xC2,
(byte) 0xC6, (byte) 0x06, (byte) 0x07, (byte) 0xC7, (byte) 0x05,
(byte) 0xC5, (byte) 0xC4, (byte) 0x04, (byte) 0xCC, (byte) 0x0C,
(byte) 0x0D, (byte) 0xCD, (byte) 0x0F, (byte) 0xCF, (byte) 0xCE,
(byte) 0x0E, (byte) 0x0A, (byte) 0xCA, (byte) 0xCB, (byte) 0x0B,
(byte) 0xC9, (byte) 0x09, (byte) 0x08, (byte) 0xC8, (byte) 0xD8,
(byte) 0x18, (byte) 0x19, (byte) 0xD9, (byte) 0x1B, (byte) 0xDB,
(byte) 0xDA, (byte) 0x1A, (byte) 0x1E, (byte) 0xDE, (byte) 0xDF,
(byte) 0x1F, (byte) 0xDD, (byte) 0x1D, (byte) 0x1C, (byte) 0xDC,
(byte) 0x14, (byte) 0xD4, (byte) 0xD5, (byte) 0x15, (byte) 0xD7,
(byte) 0x17, (byte) 0x16, (byte) 0xD6, (byte) 0xD2, (byte) 0x12,
(byte) 0x13, (byte) 0xD3, (byte) 0x11, (byte) 0xD1, (byte) 0xD0,
(byte) 0x10, (byte) 0xF0, (byte) 0x30, (byte) 0x31, (byte) 0xF1,
(byte) 0x33, (byte) 0xF3, (byte) 0xF2, (byte) 0x32, (byte) 0x36,
(byte) 0xF6, (byte) 0xF7, (byte) 0x37, (byte) 0xF5, (byte) 0x35,
(byte) 0x34, (byte) 0xF4, (byte) 0x3C, (byte) 0xFC, (byte) 0xFD,
(byte) 0x3D, (byte) 0xFF, (byte) 0x3F, (byte) 0x3E, (byte) 0xFE,
(byte) 0xFA, (byte) 0x3A, (byte) 0x3B, (byte) 0xFB, (byte) 0x39,
(byte) 0xF9, (byte) 0xF8, (byte) 0x38, (byte) 0x28, (byte) 0xE8,
(byte) 0xE9, (byte) 0x29, (byte) 0xEB, (byte) 0x2B, (byte) 0x2A,
(byte) 0xEA, (byte) 0xEE, (byte) 0x2E, (byte) 0x2F, (byte) 0xEF,
(byte) 0x2D, (byte) 0xED, (byte) 0xEC, (byte) 0x2C, (byte) 0xE4,
(byte) 0x24, (byte) 0x25, (byte) 0xE5, (byte) 0x27, (byte) 0xE7,
(byte) 0xE6, (byte) 0x26, (byte) 0x22, (byte) 0xE2, (byte) 0xE3,
(byte) 0x23, (byte) 0xE1, (byte) 0x21, (byte) 0x20, (byte) 0xE0,
(byte) 0xA0, (byte) 0x60, (byte) 0x61, (byte) 0xA1, (byte) 0x63,
(byte) 0xA3, (byte) 0xA2, (byte) 0x62, (byte) 0x66, (byte) 0xA6,
(byte) 0xA7, (byte) 0x67, (byte) 0xA5, (byte) 0x65, (byte) 0x64,
(byte) 0xA4, (byte) 0x6C, (byte) 0xAC, (byte) 0xAD, (byte) 0x6D,
(byte) 0xAF, (byte) 0x6F, (byte) 0x6E, (byte) 0xAE, (byte) 0xAA,
(byte) 0x6A, (byte) 0x6B, (byte) 0xAB, (byte) 0x69, (byte) 0xA9,
(byte) 0xA8, (byte) 0x68, (byte) 0x78, (byte) 0xB8, (byte) 0xB9,
(byte) 0x79, (byte) 0xBB, (byte) 0x7B, (byte) 0x7A, (byte) 0xBA,
(byte) 0xBE, (byte) 0x7E, (byte) 0x7F, (byte) 0xBF, (byte) 0x7D,
(byte) 0xBD, (byte) 0xBC, (byte) 0x7C, (byte) 0xB4, (byte) 0x74,
(byte) 0x75, (byte) 0xB5, (byte) 0x77, (byte) 0xB7, (byte) 0xB6,
(byte) 0x76, (byte) 0x72, (byte) 0xB2, (byte) 0xB3, (byte) 0x73,
(byte) 0xB1, (byte) 0x71, (byte) 0x70, (byte) 0xB0, (byte) 0x50,
(byte) 0x90, (byte) 0x91, (byte) 0x51, (byte) 0x93, (byte) 0x53,
(byte) 0x52, (byte) 0x92, (byte) 0x96, (byte) 0x56, (byte) 0x57,
(byte) 0x97, (byte) 0x55, (byte) 0x95, (byte) 0x94, (byte) 0x54,
(byte) 0x9C, (byte) 0x5C, (byte) 0x5D, (byte) 0x9D, (byte) 0x5F,
(byte) 0x9F, (byte) 0x9E, (byte) 0x5E, (byte) 0x5A, (byte) 0x9A,
(byte) 0x9B, (byte) 0x5B, (byte) 0x99, (byte) 0x59, (byte) 0x58,
(byte) 0x98, (byte) 0x88, (byte) 0x48, (byte) 0x49, (byte) 0x89,
(byte) 0x4B, (byte) 0x8B, (byte) 0x8A, (byte) 0x4A, (byte) 0x4E,
(byte) 0x8E, (byte) 0x8F, (byte) 0x4F, (byte) 0x8D, (byte) 0x4D,
(byte) 0x4C, (byte) 0x8C, (byte) 0x44, (byte) 0x84, (byte) 0x85,
(byte) 0x45, (byte) 0x87, (byte) 0x47, (byte) 0x46, (byte) 0x86,
(byte) 0x82, (byte) 0x42, (byte) 0x43, (byte) 0x83, (byte) 0x41,
(byte) 0x81, (byte) 0x80, (byte) 0x40 };
public int value;
public CRC16() {
value = 0;
}
public void update(byte[] puchMsg, int usDataLen) {
int uIndex;
// int i = 0;
for (int i = 0; i < usDataLen; i++) {
uIndex = (uchCRCHi ^ puchMsg[i]) & 0xff;
uchCRCHi = (byte) (uchCRCLo ^ auchCRCHi[uIndex]);
uchCRCLo = auchCRCLo[uIndex];
}
value = ((((int) uchCRCHi) << 8 | (((int) uchCRCLo) & 0xff))) & 0xffff;
return;
}
public void reset() {
value = 0;
uchCRCHi = (byte) 0xff;
uchCRCLo = (byte) 0xff;
}
public int getValue() {
return value;
}
private static byte uniteBytes(byte src0, byte src1) {
byte _b0 = Byte.decode("0x" + new String(new byte[] { src0 }))
.byteValue();
_b0 = (byte) (_b0 << 4);
byte _b1 = Byte.decode("0x" + new String(new byte[] { src1 }))
.byteValue();
byte ret = (byte) (_b0 ^ _b1);
return ret;
}
private static byte[] HexString2Buf(String src) {
int len = src.length();
byte[] ret = new byte[len / 2+2];
byte[] tmp = src.getBytes();
for (int i = 0; i < len; i += 2) {
ret[i / 2] = uniteBytes(tmp[i], tmp[i + 1]);
}
return ret;
}
public static byte[] getSendBuf(String toSend){
byte[] bb = HexString2Buf(toSend);
CRC16 crc16 = new CRC16();
crc16.update(bb, bb.length-2);
int ri = crc16.getValue();
bb[bb.length-1]=(byte) (0xff & ri);
bb[bb.length-2]=(byte) ((0xff00 & ri) >> 8);
return bb;
}
public static boolean checkBuf(byte[] bb){
CRC16 crc16 = new CRC16();
crc16.update(bb, bb.length-2);
int ri = crc16.getValue();
if(bb[bb.length-1]==(byte)(ri&0xff)
&& bb[bb.length-2]==(byte) ((0xff00 & ri) >> 8))
return true;
return false;
}
public static String getBufHexStr(byte[] raw){
if ( raw == null ) {
return null;
}
final StringBuilder hex = new StringBuilder( 2 * raw.length );
for ( final byte b : raw ) {
hex.append(HEXES.charAt((b & 0xF0) >> 4))
.append(HEXES.charAt((b & 0x0F)));
}
return hex.toString().toLowerCase();
}
/****
得到CRC验证
@param tt
*/
public static String getCrc(String tem){
// String tem="";
// for(int i=0;i // tem+=tt[i]; // System.out.println("这是传入的值"+tt[i]); // } byte[] sbuf = CRC16.getSendBuf(tem); System.out.println("这是得到的crc"+CRC16.getBufHexStr(sbuf)); return CRC16.getBufHexStr(sbuf).substring(12, 16).toLowerCase(); } /**得到要发送的数据 */ public static String getSendData(String [] tt) { String tem=""; for(int i=0;i tem+=tt[i]; } byte[] sbuf = CRC16.getSendBuf(tem); return CRC16.getBufHexStr(sbuf); } public static byte[] getSendBuf2(String [] tt){ String tem=""; for(int i=0;i tem+=tt[i]; } byte[] bb = HexString2Buf(tem); CRC16 crc16 = new CRC16(); crc16.update(bb, bb.length-2); int ri = crc16.getValue(); bb[bb.length-1]=(byte) (0xff & ri); bb[bb.length-2]=(byte) ((0xff00 & ri) >> 8); return bb; } public static void main(String[] args) { // TODO Auto-generated method stub //0103040a3d3fb739a1----sendB //010304b8523ffeef32----sendB byte[] sbuf = CRC16.getSendBuf("0103040a3d3fb7"); System.out.println(CRC16.getBufHexStr(sbuf)); } } Test代码如下: package oldTest; import java.io.Flushable; import java.io.InputStream; import java.io.OutputStream; import java.util.Enumeration; import java.util.Random; import javax.comm.CommPortIdentifier; import javax.comm.SerialPort; public class Test { static Enumeration portList; static CommPortIdentifier portId; static SerialPort serialPort; static OutputStream outputStream; static InputStream inputStream; static String nodeIdx=""; static String crc=""; public static StringBuffer open()throws Exception { CommPortIdentifier commportidentifier = CommPortIdentifier .getPortIdentifier("COM1"); serialPort = (SerialPort) commportidentifier.open("scy app", 80); outputStream = serialPort.getOutputStream(); inputStream = serialPort.getInputStream(); InputStream input = serialPort.getInputStream(); while (true) { StringBuffer content = new StringBuffer(); int i = 0; String tag = ""; String crcCode1 = ""; String[] inputString = new String[6]; String crcCode2 = ""; String tempString = ""; serialPort.setInputBufferSize(8); while (i < 8) { if (i < 6) { tempString = Integer.toHexString(input.read()); if (tempString.length() < 2) { tempString = "0" + tempString; } inputString[i] = tempString; // inputString[0];得到站点名称 nodeIdx = inputString[0]; // inputString[2] + inputString[3];得到检测指标 tag = inputString[2] + inputString[3]; content.append(tempString); System.out.println("==这是数据段"+content); } else { if (i == 6) {// 得到Crc值的前两位 crcCode1 = Integer.toHexString(input.read()); if (crcCode1.length() < 2) { crcCode1 = "0" + crcCode1; } } if (i == 7) {// 得到Crc值的后两位 crcCode2 = Integer.toHexString(input.read()); if (crcCode2.length() < 2) { crcCode2 = "0" + crcCode2; } } crc=crcCode1+crcCode2; System.out.println("==这是crc"+crc); } i++; } if (CRC16.getCrc(content.toString()).equals(crc)) { // System.out.println(crcCode1 + crcCode2 + "得到的数据段正确" // + CRC16.getCrc(inputString)); String nodeName = ""; if (nodeIdx.equals("01")) { nodeName = "监测站点1"; checkNode(tag, nodeName); } else { System.out.println("这也许是监测站点2的站点"); nodeName = "监测站点2"; checkNode(tag, nodeName); } } else { System.out.println(crc + "得到的数据段不正确" } } } public static void main(String[] args) { try { open(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static void checkNode(String tag, String nodeName) { if (tag.equals("012c")) { // System.out.println("这是说明要查悬浮物"); sendData(nodeName, "悬浮物"); } else if (tag.equals("0064")) { // System.out.println("这是说明要查PH值"); sendData(nodeName, "PH值"); } else if (tag.equals("0b54")) { // System.out.println("这是说明要查氨氮"); sendData(nodeName, "氨氮"); } else if (tag.equals("0d48")) { sendData(nodeName, "污水总量"); } else if (tag.equals("0000")) { sendData(nodeName, "污水总量"); } else if (tag.equals("01f4")) { sendData(nodeName, "COD"); } else { // System.out.println(tag + "这个tag不知道是啥"); } } public static int getRandom(int min, int max) { Random random = new Random(); int s = random.nextInt(max) % (max - min + 1) + min; return s; } public static int getRandomEnd() { int max = 99; int min = 01; Random random = new Random(); int s = random.nextInt(max) % (max - min + 1) + min; return s; } public static float getFloatNum(int min, int max) { return Float.valueOf(getRandom(min, max) + "." + getRandomEnd()); } public static void sendData(String nodeName, String tagName) { DB db = new DB(); try { Float ff = 0f; // ff = db.onSelect(nodeName, tagName); ff=getFloatNum(1,99); java.text.NumberFormat formater = java.text.DecimalFormat .getInstance(); String[] totalTemp = new String[7]; if (nodeName.equals("检测站点1")) { totalTemp[0] = "01"; // if(tagName.equals("COD")){ // ff=15f; // }else{ // ff=11f; // } } else { totalTemp[0] = "02"; } formater.setMaximumFractionDigits(2); formater.setMinimumFractionDigits(2); ff = Float.valueOf(formater.format(ff)); System.out.println("查询完毕," + tagName + "值为:" + ff); int fi = Float.floatToRawIntBits(ff); String num = Integer.toHexString(fi).toString(); if (!num.equals("0")) { totalTemp[1] = "03"; totalTemp[2] = "04"; totalTemp[4] = num.substring(6, 8); totalTemp[3] = num.substring(4, 6); totalTemp[6] = num.substring(2, 4); totalTemp[5] = num.substring(0, 2); } else { totalTemp[1] = "03"; totalTemp[2] = "04"; totalTemp[4] = "00"; totalTemp[3] = "00"; totalTemp[6] = "00"; totalTemp[5] = "00"; } byte[] sendB = CRC16.getSendBuf2(totalTemp); outputStream.write(sendB); outputStream.flush(); outputStream.close(); System.out.println("发送完毕"); } catch (Exception e) { e.printStackTrace(); } finally { db.close(); } } } DB类如下: package oldTest; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Calendar; import java.util.Random; public class DB { private Connection con; private Statement sta; private ResultSet res; private String driverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver"; // 加载JDBC驱动 private String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=MonitoringSystem"; // 连接服务器和数据库sample private String userName = "sa"; // 默认用户名 private String userPwd = ""; // 密码 public DB() { try { Class.forName(driverName); con = DriverManager.getConnection(dbURL, userName, userPwd); // System.out.println("Connection Successful!"); // 如果连接成功 // 控制台输出Connection // Successful! } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static int getRandom(int min, int max) { Random random = new Random(); int s = random.nextInt(max) % (max - min + 1) + min; return s; } public static int getRandomEnd() { int max = 99; int min = 01; Random random = new Random(); int s = random.nextInt(max) % (max - min + 1) + min; return s; } public static float getFloatNum(int min, int max) { return Float.valueOf(getRandom(min, max) + "." + getRandomEnd()); } public static float getCFZ() { return getFloatNum(40, 48); } public static float getCY() { return getFloatNum(100, 110); } /*** 得到N条记录 @param tagName */ public Float onSelect(String nodeName, String tagName) { Float ff = 0f; String sql = "select * from DQYT_MacamCore.dbo.tpoints where name='" try { sta = con.createStatement(); res = sta.executeQuery(sql); while (res.next()) { int tagid = res.getInt("tagId"); String name = res.getString("Name"); String sql2 = "select top 1 * from DQYT_MacamHisData.dbo." getTBName() + " where tagid=" + tagid // System.out.println(sql2); ResultSet rs2; Statement sta2 = null; sta2 = con.createStatement(); rs2 = sta2.executeQuery(sql2); if (tagName.equals("污水总量")) { String sql3 = "insert into MonitoringSystem.dbo.UploadInfo values(" tagid ",'" name "'," ff ",'" System.out.println(sql3); Statement sta3 = null; sta3 = con.createStatement(); sta3.executeUpdate(sql3); return ff; } else { if (name.equals(tagName)) { while (rs2.next()) { if (nodeName.equals("监测站点1")) { if (rs2.getFloat(4) >= 50) { ff = getCFZ(); } else { ff = rs2.getFloat(4); } } else if (nodeName.equals("监测站点2")) { if (rs2.getFloat(4) >= 120) { ff = getCY(); } else { ff = rs2.getFloat(4); } } String sql3 = "insert into MonitoringSystem.dbo.UploadInfo values(" tagid ",'" name "'," ff ",'" System.out.println(sql3); Statement sta3 = null; sta3 = con.createStatement(); sta3.executeUpdate(sql3); return ff; } } } } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return 0f; } /*** 根据站点名称,得到其污水总量 @param tagName */ public Float getTagAndTypeLayerId(String nodeName, String tagName) { String sql = "select * from DQYT_MacamCore.dbo.tpoints where name='" try { sta = con.createStatement(); res = sta.executeQuery(sql); // System.out.println(sql); while (res.next()) { int tagid = res.getInt("tagId"); String name = res.getString("Name"); String errorAmount = getErrorAmount(res.getInt("nodeIdx")); Long tSewage = getTSewage(tagid); ResultSet rs2; Statement sta2 = null; sta2 = con.createStatement(); sql = "insert into MonitoringSystem.dbo.UploadInfo values(" tagid ",'" name "'," .valueOf((Long.parseLong(errorAmount) + tSewage)) sta2.executeUpdate(sql); return Float.valueOf((Long.parseLong(errorAmount) + tSewage)); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /*** 得到污水总量 @param tagId */ public Long getTSewage(int tagId) { try { String sql = "select sum(tSewage) from MonitoringSystem.dbo.TotalSewage where tagId=" sta = con.createStatement(); res = sta.executeQuery(sql); if (res.next()) { Long tSewage = res.getLong(1); return tSewage; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return new Long(0); } /*** 得到该站点的误差值 @param typeLayerIdx */ public String getErrorAmount(int typeLayerIdx) { try { String sql = "select * from MonitoringSystem.dbo.SiteMessage where typeLayerIdx=" sta = con.createStatement(); res = sta.executeQuery(sql); while (res.next()) { String errorAmount = res.getString("errorAmount"); return errorAmount; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception ee) { ee.printStackTrace(); } return "0"; } public void close() { try { if (sta != null) { sta.close(); } if (con != null) { con.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public String getTBName() { java.util.Date d = new java.util.Date(); java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(); sdf.applyPattern("yyyyMMdd"); String table = "THisData" + sdf.format(d); table = "THisData20091218"; return table; } public String getStartTime() { java.util.Date d = new java.util.Date(); Calendar cal1 = Calendar.getInstance(); // cal1.set(2010, 04, 21); d.setMinutes(d.getMinutes() - 1); java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(); sdf.applyPattern("yyyy-MM-dd HH:mm"); String ttime = sdf.format(d.getTime()); return ttime; } public static String getEndTime() { java.util.Date d = new java.util.Date(); Calendar cal1 = Calendar.getInstance(); // cal1.set(2010, 04, 21); java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat(); sdf.applyPattern("yyyy-MM-dd HH:mm"); String ttime = sdf.format(d.getTime()); return ttime; } public static void main(String[] args) { DB db = new DB(); db.onSelect("监测站点1", "COD"); } }
本文名称:Java中ModBus的使用方法
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