2019独角兽企业重金招聘Python工程师标准>>> 
JSONArray去重问题
JSONArray array = ["2","0","0","0","0","0"];
private String[] instanceAaary(JSONArray array) throws JSONException{
String[] strs = new String[array.length()];
for (int i = 0; i < array.length(); i++) {
strs[i] = array.getString(i);
}
List result = new ArrayList();
boolean flag;
for(int i=0;i 解析json在本地创建xml文件
public static final String CMD103 = "{"CMD_ID":103,"CONTENT":[[[2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],1,"00001\u91c7\u533a"]," +
"[[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],2,"00002\u91c7\u533a"]]}";
public void createAQDQ(Element root){
String[][] Data = null;
//断电区域代码（根据煤矿井下区域划分情况设定，范围为0000-9999，不可重复。）
String ss_poffarea_code = "";
// 断电区域名称
String ss_poffarea_name = "";
// 安全监控系统空间节点代码(空间节点代码不可重复) 暂时为空
String ss_gisnode_code = "";
try {
//区域定义
JSONObject obj = new JSONObject(CMD103);
if (obj.has("CONTENT")) {
JSONArray Array1 = obj.getJSONArray("CONTENT"); //获取属性名对应的二维数组
Data = new String[Array1.length()][];
for (int i = 0; i < Array1.length(); i++) {
JSONArray Array2 = Array1.getJSONArray(i); //获取一维数组
Data[i] = new String[Array2.length()];
for (int j = 0; j < Array2.length(); j++) {
Data[i][j] = Array2.getString(j); //获取二维数组中的数据
//断电区域代码
ss_poffarea_code = Data[i][1];
// 断电区域名称
ss_poffarea_name = Data[i][2];
}
Element element = new Element("data").setAttribute("ss_poffarea_code", ss_poffarea_code)
.setAttribute("ss_poffarea_name", ss_poffarea_name);
JSONArray Array3 = Array2.getJSONArray(0);
for (int k = 0; k < instanceAaary(Array3).length; k++) {
// 安全监控系统空间节点代码(空间节点代码不可重复)
ss_gisnode_code = Array3.getString(k);
element.addContent(new Element("point").setAttribute("ss_gisnode_code",ss_gisnode_code));
}
root.addContent(element);
}
}
}catch (JSONException e){
e.printStackTrace();
}
}
等待30S执行某方法
long lCurrentTime = System.currentTimeMillis();
if(!bStart106 && !CMD106.equals("")){
lLastTime = System.currentTimeMillis();
bStart106 = true;
}
if(bStart106 && ((lCurrentTime-lLastTime)>=30*1000)){
lLastTime = lCurrentTime;
createXML("AQSS");
}
//数据生成时间
public String getCs_data_time(){
String[][] Data = null;
String cs_data_time = "";
try{
JSONObject obj101 = new JSONObject(CMD101);
if (obj101.has("CONTENT")){
JSONArray Array1 = obj101.getJSONArray("CONTENT"); //获取属性名对应的二维数组
Data = new String[Array1.length()][];
for (int i = 0; i < Array1.length(); i++) {
JSONArray Array2 = Array1.getJSONArray(i); //获取CMD101一维数组
Data[i] = new String[Array2.length()];
for (int j = 0; j < Array2.length(); j++) {
Data[i][j] = Array2.getString(j); //获取CMD101二维数组中的数据
//数据生成时间
cs_data_time = Data[i][0];
}
}
}
}catch (JSONException e){
e.printStackTrace();
}
return cs_data_time;
}//检测传感器状态
private String[] bitChannel(int ctbit){
String[] channel = new String[8];
for (int i = 0; i < channel.length; i++) {
if((ctbit&0x1)==1){
channel[i]="1";
}else{
channel[i]="0";
}
ctbit = ctbit>>1;
}
return channel;
}//去除重复
private String[] instanceAaary(JSONArray array) throws JSONException{
String[] strs = new String[array.length()];
for (int i = 0; i < array.length(); i++) {
strs[i] = array.getString(i);
}
List result = new ArrayList();
boolean flag;
for(int i=0;i Java获取websocket数据
package com.servlet;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import java.nio.channels.NotYetConnectedException;
import org.java_websocket.WebSocket.READYSTATE;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.drafts.Draft_17;
import org.java_websocket.handshake.ServerHandshake;
public class Client {
public static WebSocketClient client;
public static void main(String[] args) throws URISyntaxException, NotYetConnectedException, UnsupportedEncodingException {
client = new WebSocketClient(new URI("ws://192.168.126.131:9999"),new Draft_17()) {
EstablishXMLFile exf = new EstablishXMLFile();
@Override
public void onOpen(ServerHandshake arg0) {
System.out.println("打开链接");
}
@Override
public void onMessage(String arg0) {
exf.recieveMessage(arg0);
}
@Override
public void onError(Exception arg0) {
arg0.printStackTrace();
System.out.println("发生错误已关闭");
}
@Override
public void onClose(int arg0, String arg1, boolean arg2) {
System.out.println("链接已关闭");
}
@Override
public void onMessage(ByteBuffer bytes) {
try {
System.out.println(new String(bytes.array(),"utf-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
};
client.connect();
while(!client.getReadyState().equals(READYSTATE.OPEN)){
System.out.println("还没有打开");
}
System.out.println("打开了");
send("hello world".getBytes("utf-8"));
client.send("hello world");
}
public static void send(byte[] bytes){
client.send(bytes);
}
}使double型数据按某种格式输出
ss_analog_value = new DecimalFormat("00.0").format(Double.parseDouble("3.26"));
获取properties文件中的filename和URL
public String getPropertiesReader(String str){
Properties properties=new Properties();//获取Properties实例
InputStream inStream=getClass().getResourceAsStream("config.properties");//获取配置文件输入流
try {
properties.load(inStream);//载入输入流
Enumeration enumeration=properties.propertyNames();//取得配置文件里所有的key值
while(enumeration.hasMoreElements()){
String key=(String) enumeration.nextElement();
if(str.equals("cs_mine_code")&&key.equals("cs_mine_code")){
return properties.getProperty(key);
}else if(str.equals("filename")&&key.equals("filename")){
return properties.getProperty(key);
}else if(str.equals("url")&&key.equals("url")){
return properties.getProperty(key);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return "";
}获取txt配置文件（json数据格式）中的信息
private String getFormat(String type,String id,String str){
String ret = "";
try {
File file = new File("kj66.txt");
InputStreamReader read = new InputStreamReader(new FileInputStream(file), "utf-8");
BufferedReader bufferedReader = new BufferedReader(read);
StringBuffer buffer = new StringBuffer();
String lineTxt = null;
while ((lineTxt = bufferedReader.readLine()) != null) {
buffer.append(lineTxt);
}
JSONObject obj = new JSONObject(buffer.toString());
if(type.equals("simulate")){
//模拟量
JSONArray array_sim = obj.getJSONArray("simulate");
String[] sensorID_sim = new String[array_sim.length()];
String[] name_sim = new String[array_sim.length()];
String[] code_sim = new String[array_sim.length()];
String[] format_sim = new String[array_sim.length()];
String[] unit_sim = new String[array_sim.length()];
for(int i = 0; i < array_sim.length(); i++ ) {
JSONObject json = array_sim.getJSONObject(i);
sensorID_sim[i] = json.getString("sensorID");
name_sim[i] = json.getString("name");
code_sim[i] = json.getString("code");
format_sim[i] = json.getString("format");
unit_sim[i] = json.getString("unit");
if(sensorID_sim[i].equals(id)){
if(str.equals("name")){
return name_sim[i];
}else if(str.equals("code")){
return code_sim[i];
}else if(str.equals("format")){
return format_sim[i];
}else if(str.equals("unit")){
return unit_sim[i];
}
}
}
}
}catch (FileNotFoundException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return "";
}hashmap巧妙取代for循环
private HashMap CMD101_Hash = new HashMap();
private void InitCMD101() {
try {
if(CMD101.equals("")) return;
JSONObject obj = new JSONObject(CMD101);
if (obj.has("CONTENT")) {
JSONArray array = obj.getJSONArray("CONTENT"); //获取属性名对应的二维数组
if(array.equals("")) return;
for (int i = 0; i < array.length(); i++) {
JSONArray array2 = array.getJSONArray(i); //获取CMD101一维数组
String[] data = new String[array2.length()];
for (int j = 0; j < array2.length(); j++) {
data[j] = array2.getString(j); //获取CMD101二维数组中的数据
}
String code = formatToThree(data[26]) + data[23] + formatToTwo(data[24]);
CMD101_Hash.put(code, data);
}
}
}catch (JSONException e){
e.printStackTrace();
}
}
private String[] getProperty_tp(String str26,String str23,String str24) {
String code = formatToThree(str26) + str23 + formatToTwo(str24);
return CMD101_Hash.get(code);
} hashmap解析
//新建一个hashmap往里面放入20个（key，value）对。
Iterator iterator= (Iterator) hashMap.keySet().iterator(); //获得keyset的iterator，进行遍历整个hashmap。
while(iterator.hasNext())
{ Integer key=(Integer) iterator.next(); Integer val=(Integer)hashMap.get(key);
System.out.println(key+": "+val);
}
Oracle触发器
create or replace trigger tr_u_sub_station
before update on sub_station
for each rowdeclare
-- local variables herebegin
if updating('is_effect') then
RAISE_APPLICATION_ERROR('-20000','不能更新is_effect字段');
end if;
end tr_u_sub_station;