Java – 平凡之火

Java中的位运算符

2020-03-082020-03-08 by wind

java中的位运算符有：左移（<<）、右移（>>）、无符号右移（>>>）、位与（&）、位或 … Read moreJava中的位运算符

多线程-ConcurrentHashMap(JDK1.8)

2020-03-082020-03-08 by wind

原文： https://www.cnblogs.com/lujiango/p/7580558.html 前言 … Read more多线程-ConcurrentHashMap(JDK1.8)

Lombok @Builder.Default 之坑

2019-07-252019-07-25 by wind

如果一个用了 Lombok，带了 @Builder的类中，给某个property设置了一个初始值，在编译时会 … Read moreLombok @Builder.Default 之坑

偶遇 JDK 1.8 还未修复的 SecureRandom.getInstance(“SHA1PRNG”) 之 bug

2020-03-032019-05-23 by Ryan

楼主今天兴高采烈的在部署环境，下载 JDK，打包项目，上传至服务器。配置 JDK ，打包上传项目楼主就不在这 … Read more偶遇 JDK 1.8 还未修复的 SecureRandom.getInstance(“SHA1PRNG”) 之 bug

IDEA 下，老司机教你如何 debug lambda

2020-03-032019-03-19 by Ryan

目前程序员市场环境下，Java 党的 lamda 语法已经无处不在，比如大家熟悉的 Spring 5.x 框架 … Read moreIDEA 下，老司机教你如何 debug lambda

Word 模板动态数据合成

2019-01-012018-06-05 by wind

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* 项目名称：dev

* 文件名称：DocxTemplateUtils.java

* 日期：17-10-11 下午2:18

* 作者：yangyan

package com.deyatong.common.util;

import org.apache.commons.lang3.StringUtils;

import org.apache.poi.xwpf.usermodel.*;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import java.io.*;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**

* WORD DOCX 文件变量替换输出工具类

public class DocxTemplateUtils {

Logger logger = LoggerFactory.getLogger(getClass());

/**

* 变量替换符号的正则，用来找到 ${xxx} 这样的内容，并实现替换

Pattern compile = Pattern.compile("(\\$\\{([^\\}]*)\\})");

private final Map<String, ?> params; //数据填充对象

InputStream is; //读入模板文件的流

XWPFDocument doc; //内存中构建的文档对象

/**

* 使用文件路径和变量集合创建

* @param templateDocxFile

* @param params

public DocxTemplateUtils(String templateDocxFile, Map<String, ?> params) {

this.params = params;

try {

is = new FileInputStream(templateDocxFile);

doc = new XWPFDocument(is);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

/**

* 使用文件和和变量集合创建

* @param templateDocxFile

* @param params

public DocxTemplateUtils(File templateDocxFile, Map<String, ?> params) {

this.params = params;

try {

is = new FileInputStream(templateDocxFile);

doc = new XWPFDocument(is);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

/**

* 使用模板读入的流和变量集合创建

* @param templateDocxFileInputStream

* @param params

public DocxTemplateUtils(InputStream templateDocxFileInputStream, Map<String, ?> params) {

this.params = params;

try {

is = templateDocxFileInputStream;

doc = new XWPFDocument(is);

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

/**

* 此类为poi操作word模板的工具类

**/

public XWPFDocument getDoc() {

return doc;

}

/**

* 替换所有段落中的变量

public void replaceInPara() {

Iterator<XWPFParagraph> iterator = doc.getParagraphsIterator();

XWPFParagraph para;

while (iterator.hasNext()) {

para = iterator.next();

this.replaceInPara(para);

}

/**

* 替换传入段落里面的变量

* @param para 要替换的段落

private void replaceInPara(XWPFParagraph para) {

String paragraphText = para.getParagraphText();

int start = paragraphText.indexOf("${");

int end = paragraphText.indexOf("}");

if (start == -1 && end == -1) { //段落中没有变量直接跳过

logger.warn("没开始，没结束，直接跳过：" + paragraphText);

return;

}

boolean isStart = false;

boolean isEnd = false;

StringBuilder varName = null;

List<XWPFRun> runs;

Matcher matcher;

runs = para.getRuns(); //不同的文字片段可能有不同的样式

logger.info("整段：" + paragraphText);

// for (int i = 0; i < runs.size(); i++) {

// XWPFRun run = runs.get(i);

// String runText = run.toString().trim();

// System.out.println(runText);

// }

for (int i = 0; i < runs.size(); i++) {

XWPFRun run = runs.get(i);

String runText = run.toString().trim();

logger.debug(">>>处理文字片段：" + runText);

String tail = "";

if (runText.trim().length() == 0) {

continue;

}

if (varName == null) {

varName = new StringBuilder();

}

int s = runText.indexOf("${");

if (s > -1) { //有开始

int n = runText.indexOf("}", s);

if (n != -1) { //有结束

varName.append(runText.substring(s, n + 1));

isEnd = true;

if (runText.indexOf("${", n) != -1) { //一行内是否有第二个变量开启

isStart = true;

}

tail = runText.substring(n + 1);

} else { //没结束

isStart = true;

isEnd = false;

varName.append(runText.substring(s));

run.setText("", 0);

}

} else { //没开始

if (isStart) { //之前开始了

int n = runText.indexOf("}");

if (n == -1) { //没结束

varName.append(runText);

run.setText("", 0);

} else { //结束

isStart = false;

varName.append(runText.substring(0, n + 1));

if (runText.indexOf("${", n) != -1) { //一行内是否有第二个变量开启

isStart = true;

tail = runText.substring(n + 1);

}

isEnd = true;

}

if (isEnd) {

String s1 = varName.toString();

logger.warn("拼接结果：" + s1);

Object o = params.get(s1);

String value = o == null ? "" : o.toString();

run.setText(value + tail, 0);

varName = null;

isEnd = false;

}

// if (s == -1) { //如果没有开始标记后面的就不用执行了

// break;

// }

//文字替换处理

matcher = compile.matcher(runText);

while (matcher.find()) {

String group = matcher.group(1);

logger.debug("----找到变量：" + group + String.format("，文字片段内位置：(%s-%s)", matcher.start(), matcher.end()));

Object o = params.get(group);

String replacement = "";

if (o != null) {

if (o instanceof List) {

//替换的内容

logger.debug("----变量替换成为：" + StringUtils.join(o));

run.setText("", 0);

List list = (List) o;

for (Object o1 : list) {

run.addCarriageReturn();

run.setText(o1.toString());

}

break;

} else {

replacement = o.toString();

//替换的内容

runText = matcher.replaceFirst(replacement);

logger.debug("----变量替换成为：" + replacement);

run.setText(runText, 0);

logger.debug(">>>片段替换成为：" + runText);

}

/**

* 替换表格里面的变量

public void replaceInTable() {

Iterator<XWPFTable> iterator = doc.getTablesIterator();

XWPFTable table;

List<XWPFTableRow> rows;

List<XWPFTableCell> cells;

List<XWPFParagraph> paras;

while (iterator.hasNext()) {

table = iterator.next();

rows = table.getRows();

for (XWPFTableRow row : rows) {

cells = row.getTableCells();

for (XWPFTableCell cell : cells) {

paras = cell.getParagraphs();

for (XWPFParagraph para : paras) {

this.replaceInPara(para);

}

/**

* 关闭输入流

public void closeInputStream() {

if (is != null) {

try {

is.close();

} catch (Exception e) {

e.printStackTrace();

}

/**

* 关闭输出流

* @param os

public void closeOutputStream(OutputStream os) {

if (os != null) {

try {

os.close();

} catch (Exception e) {

e.printStackTrace();

}

public void addTablesRows(List<List<String>> data, int tableIndex, int rowIndex) {

List<XWPFTable> list = doc.getTables();

System.out.println("----" + list.size());

XWPFTable xt = list.get(tableIndex);

if (rowIndex < 0 || (rowIndex + 1) > xt.getNumberOfRows()) {

rowIndex = xt.getNumberOfRows() - 1;

}

XWPFTableRow row1 = xt.getRow(rowIndex + 1);

if (row1 == null) {

row1 = xt.createRow();

addTablesRows(data, tableIndex, rowIndex);

return;

}

for (int i = 0; i < data.size(); i++) {

XWPFTableRow row2 = xt.getRow(rowIndex + i);

if (row2 == null) {

row2 = xt.createRow();

}

List<XWPFTableCell> cells = row2.getTableCells();

List<String> clist = data.get(i);

for (int k = 0; k < clist.size(); k++) {

XWPFTableCell cell = row2.getCell(k);

cell.setText(clist.get(k));

}

根据已知假期列表，计算N个工作日之后是哪一天

2019-01-012018-05-24 by wind

HolidayVo where = new HolidayVo();

int guessHoliday = 0;

for (int i = 0; i < day / 5; i++) {

guessHoliday += 2;

}

Date guessEnd = DateUtils.addDays(date, day + guessHoliday);

String startYear = DateFormatUtils.format(date, "yyyy");

String guessEndYear = DateFormatUtils.format(guessEnd, "yyyy");

boolean b = startYear.equalsIgnoreCase(

guessEndYear);

where.setYear(startYear);

List < HolidayVo > allHoliday = null;

if (b) {

allHoliday = this.getAllHoliday(where);

} else {

allHoliday = new ArrayList < > ();

for (int year = Integer.valueOf(startYear); year >= Integer.valueOf(guessEndYear); year++) {

where.setYear(String.valueOf(year));

allHoliday.addAll(this.getAllHoliday(where));

}

Set < String > holidaySet = allHoliday.stream().map(Holiday::getDate).collect(Collectors.toSet());

int passWorkDay = 0;

Date testDate = date;

while (passWorkDay == day) {

testDate = DateUtils.addDays(testDate, 1);

if (!holidaySet.contains(DateFormatUtils.format(testDate, "yyyy-MM-dd"))) {

passWorkDay++;

}

return testDate;

jmap 导出 java 进程内存状态

2019-01-012018-03-27 by wind

例如导出hallSysten线程堆栈信息到文件： [crayon-5e815bf3275a2547204354 … Read morejmap 导出 java 进程内存状态

rabbitmq 远程连接

2019-01-012017-12-30 by wind

java 程序访问需要注意：配置文件中NODE_IP_ADDRESS不要给值，就可以允许远程连接了。默认ra … Read morerabbitmq 远程连接

JAVA 获取网卡信息

2019-01-012017-07-30 by wind

Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();

while (networkInterfaces.hasMoreElements()) {

NetworkInterface networkInterface = networkInterfaces.nextElement();

if (networkInterface.isLoopback() || networkInterface.isVirtual()) {

continue;

}

System.out.println(ToStringBuilder.reflectionToString(networkInterface, ToStringStyle.MULTI_LINE_STYLE));

}

NetworkInterface en0 = NetworkInterface.getByName("en0");

System.out.println(ToStringBuilder.reflectionToString(en0));

System.out.println(en0.getInterfaceAddresses().get(1).getAddress().getHostAddress());

Log4j 使用经验总结

2019-01-012017-07-20 by wind

在1.x 版本的 log4j 中，配置rootLogger的日志级别会限制其他logger 的日志级别，其他 … Read moreLog4j 使用经验总结

fastxml 的 jackson helper类，便于json转换

2019-01-012017-06-30 by wind

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* 项目名称：dev

* 文件名称：JsonObjectUtils.java

* 日期：17-6-30 上午8:58

* 作者：yangyan

package cn.firegod.common.utils.json;

import cn.firegod.codegen.bean.ColumnMeta;

import com.fasterxml.jackson.core.JsonGenerationException;

import com.fasterxml.jackson.core.JsonParseException;

import com.fasterxml.jackson.core.JsonProcessingException;

import com.fasterxml.jackson.core.type.TypeReference;

import com.fasterxml.jackson.databind.DeserializationConfig;

import com.fasterxml.jackson.databind.JsonMappingException;

import com.fasterxml.jackson.databind.JsonNode;

import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;

import java.util.List;

import static com.fasterxml.jackson.databind.DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES;

public class JsonObjectUtils {

public static ObjectMapper m = new ObjectMapper();

static {

// 此配置的作用为当使用此工具将json中的属性还原到bean时，如果有bean中没有的属性，是否报错

m.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);

}

/**

* json 转换成 bean

* @param <T>

* @param json

* @param clazz

* @return

public static <T> T jsonToBean(String json, Class<T> clazz) {

if (json == null || clazz == null) {

return null;

}

try {

return m.readValue(json, clazz);

} catch (JsonParseException e) {

e.printStackTrace();

} catch (JsonMappingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

/**

* json node 转换成bean

* @param node

* @param clazz

* @param <T>

* @return

public static <T> T nodeToBean(JsonNode node, Class<T> clazz) {

if (node == null || clazz == null) {

return null;

}

try {

return m.treeToValue(node,clazz);

} catch (JsonParseException e) {

e.printStackTrace();

} catch (JsonMappingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

/**

* bean 转换成 json

* @param bean

* @return

public static String beanToJson(Object bean) {

if (bean == null) {

return null;

}

try {

return m.writeValueAsString(bean);

} catch (JsonGenerationException e) {

e.printStackTrace();

} catch (JsonMappingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

public static JsonNode stringToJsonNode(String jsonString) {

if (jsonString == null) {

return null;

}

try {

return m.readTree(jsonString);

} catch (JsonProcessingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

public static <T, A extends List<T>> A jsonToList(String jsonString, TypeReference<List<ColumnMeta>> clazz) throws JsonParseException, JsonMappingException, IOException {

return (A) m.readValue(jsonString, clazz);

}

短信发送接口 – SubMail

2019-01-012017-02-15 by wind

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public class SubMailSmsSender {

private static Logger logger = LoggerFactory.getLogger(SubMailSmsSender.class);

private String submailSendUrl;

private String submailAppid;

private String submailAppkey;

public SubMailSmsSender(String submailSendUrl, String submailAppid, String submailAppkey) {

this.submailSendUrl = submailSendUrl;

this.submailAppid = submailAppid;

this.submailAppkey = submailAppkey;

}

ObjectMapper objectMapper = new ObjectMapper();

/**

* SUBMAIL 的短信一对多（即1条API请求发送多个号码，并可以灵活控制每个联系人的文本变量）和群发 API 。调用方需要确保 templateId 正确， smsList 中至少有一条

* @param templateId 短信模板

* @param multi 批量发送列表json字符串

* @return 返回发送成功的接收方手机号列表

public List<String> multixsend(String templateId, String multi) {

String info = null;

boolean success = false;

List<NameValuePair> params = new ArrayList<>();

params.add(new BasicNameValuePair("appid", submailAppid));

params.add(new BasicNameValuePair("project", templateId));

params.add(new BasicNameValuePair("multi", multi));

params.add(new BasicNameValuePair("signature", submailAppkey));

try {

List<String> successPhoneList = new ArrayList<>();

HttpResponse post = HttpClientHelper.INSTANCE.post(submailSendUrl, params, "utf-8", null, null);

info = EntityUtils.toString(post.getEntity(), "utf-8");

if (logger.isDebugEnabled()) {

logger.debug("SUBMAIL 返回：" + info);

}

JsonNode jsonNode = objectMapper.readTree(info);

Iterator<JsonNode> iterator = jsonNode.iterator();

while (iterator.hasNext()) {

JsonNode next = iterator.next();

String status = next.get("status").asText();

String to = next.get("to").asText();

if ("success".equals(status)) {

successPhoneList.add(to);

if (logger.isInfoEnabled()) {

logger.info("成功发送短信给[" + to + "]");

}

} else {

String logContent = "发送短信给[" + to + "]失败";

if (logger.isInfoEnabled()) {

logger.error(logContent);

}

return successPhoneList;

} catch (IOException e) {

logger.error("请求 SubMail 服务器发送短信产生IO 错误", e);

return Collections.emptyList();

}

/**

* @param templateId 短信模板

* @param smsList 批量发送列表

* @return 返回发送成功的接收方手机号列表

public List<String> multixsend(String templateId, List<SubMailSms> smsList) {

if (smsList == null || smsList.isEmpty()) {

return Collections.emptyList();

}

String multi = null;

try {

multi = objectMapper.writeValueAsString(smsList);

} catch (JsonProcessingException e) {

e.printStackTrace();

}

return this.multixsend(templateId, multi);

}

/**

* 短信发送信息

static class SubMailSms {

private String to;

private Map<String, String> vars;

public String getTo() {

return to;

}

public void setTo(String to) {

this.to = to;

}

public Map<String, String> getVars() {

return vars;

}

public void setVars(Map<String, String> vars) {

this.vars = vars;

}

前几天，阿里发布了 java 代码规范

2019-01-012017-02-11 by wind

写的很不错，是多年的经验之谈，可以帮助 java 开发人员写出更出色的代码。点击下载：阿里官方Java 代码规 … Read more前几天，阿里发布了 java 代码规范

清除文本中的非数字内容

2019-01-012017-01-24 by wind

1	Pattern.compile("[^0-9]").matcher(string).replaceAll("")

CAS 中央身份验证服务加单点登录和单点退出学习笔记

2019-01-012016-10-10 by wind

最近在学习CAS中央认证服务和web项目使用shiro整合，整体来说步骤还是比较多的，至今有一些问题也没有彻底 … Read moreCAS 中央身份验证服务加单点登录和单点退出学习笔记

修改keystore条目的密码

2019-01-012016-09-20 by wind

1 2	keytool -keypasswd --keystore clientkeystore -alias client

freemarker中页面直接可以使用的内置对象

2019-01-012016-08-31 by wind

Request：用于获取Request对象中的attribute对象。例如：${Request[&#822 … Read morefreemarker中页面直接可以使用的内置对象

java 替换掉emoji表情

2019-01-012016-08-31 by wind

今天做搜索功能的时候发现用户提交的emoji的符号上来搜索，导致mysql数据库中的字段like的时候发生字符 … Read morejava 替换掉emoji表情

分页Page对象

2019-01-012016-05-26 by wind

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/**

* 分页对象，包含页码，每页条数，总条数 User: yangyan Date: 13-11-18 Time: 下午8:59 To change this

* template use File | Settings | File Templates.

public class Page implements Serializable {

private static final long serialVersionUID = -784438755770041677L;

private int page = 1;

private int pageSize = 50;

private long total = 0;

public int getOffset() {

return (page - 1) * pageSize;

}

public int getStart() {

return getOffset();

}

public int getLimit() {

return getPageSize();

}

public int getTotalPage() {

return (int) ((total + pageSize) / pageSize);

}

public Page() {

}

public Page(int page, int pageSize) {

this.page = page;

this.pageSize = pageSize;

}

public int getPage() {

return page;

}

public void setPage(int page) {

this.page = page;

}

public int getPageSize() {

return pageSize;

}

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

public long getTotal() {

return total;

}

public void setTotal(long total) {

this.total = total;

}

/**

* 另一种形式

public static class Offset extends Page {

private static final long serialVersionUID = -4518025561523700841L;

private int start = 0;

private int limit = 50;

public Offset() {

}

public Offset(int start, int limit) {

super(1, limit);

this.start = start;

this.limit = limit;

if (start < limit) {

setPage(1);

} else {

setPage((start + limit * 2 - 1) / limit);

}

public int getLimit() {

return limit;

}

public int getStart() {

return start;

}

public void setLimit(int limit) {

this.limit = limit;

if (start < limit) {

setPage(1);

} else {

setPage((start + limit * 2 - 1) / limit);

}

public void setStart(int start) {

this.start = start;

if (start < limit) {

setPage(1);

} else {

setPage((start + limit * 2 - 1) / limit);

}

@Override

public String toString() {

return "(page:" + this.getPage() + " pageSize:" + this.getPageSize() + ")";

}