使用EasyPoi實(shí)現(xiàn)word文檔生成和段落循環(huán)
更新時間：2025年04月08日 09:59:21 作者：ByteX
EasyPoi是一個Java的Excel和Word處理庫,主要用于將Java對象轉(zhuǎn)換為Excel或Word文檔,本文主要介紹了如何使用EasyPoi實(shí)現(xiàn)word文檔生成和段落循環(huán),有需要的可以了解下
EasyPoi介紹
EasyPoi是一個Java的Excel和Word處理庫，主要用于將Java對象轉(zhuǎn)換為Excel或Word文檔，并且可以從Excel或Word文檔中讀取數(shù)據(jù)到Java對象。本文將重點(diǎn)介紹如何使用EasyPoi寫Word文檔。
1.引入EasyPoi依賴
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-base</artifactId>
<version>4.1.3</version>
</dependency>
2.創(chuàng)建Word模板
可以使用Microsoft Word或其他能夠創(chuàng)建Word模板的軟件來設(shè)計(jì)Word文檔的模板文件。模板文件中可以使用占位符來標(biāo)記需要替換的內(nèi)容。例如，在Word文檔中可以插入占位符${name}表示需要替換的內(nèi)容。
3.創(chuàng)建Java對象
使用Java對象來存放需要寫入Word文檔的數(shù)據(jù)。
@Data
public class User {
private String name;
private int age;
}
4.使用EasyPoi寫入Word文檔
創(chuàng)建一個WordExportUtil對象，利用模板和Java對象生成Word文檔。
import cn.afterturn.easypoi.word.WordExportUtil;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;
public class WriteWordDemo {
public static void main(String[] args) throws Exception {
// 創(chuàng)建模板和數(shù)據(jù)對象
User user = new User("Tom", 18);
Map<String, Object> map = new HashMap<>();
map.put("name", user.getName());
map.put("age", user.getAge());
// 加載模板文件
XWPFDocument doc = WordExportUtil.exportWord07(
"user_template.docx", map);
// 輸出文件
FileOutputStream fos = new FileOutputStream("user.docx");
doc.write(fos);
fos.close();
doc.close();
}
}
使用WordExportUtil.exportWord07方法可以生成.docx格式的Word文檔，第一個參數(shù)為Word模板文件名，第二個參數(shù)是一個Map對象，其中包含了模板中所有的占位符和對應(yīng)的數(shù)據(jù)。
基于EasyPoi實(shí)現(xiàn)段落循環(huán)
EasyPoi寫word模版導(dǎo)出比較方便。但是如果你希望在寫word模版的時候?qū)⒍温溥M(jìn)行循環(huán)，那就實(shí)現(xiàn)不了。
下面的方法基于EasyPoi實(shí)現(xiàn)了word段落的循環(huán)。
import cn.afterturn.easypoi.cache.WordCache;
import cn.afterturn.easypoi.entity.ImageEntity;
import cn.afterturn.easypoi.util.PoiElUtil;
import cn.afterturn.easypoi.util.PoiPublicUtil;
import cn.afterturn.easypoi.word.entity.MyXWPFDocument;
import cn.afterturn.easypoi.word.entity.params.ExcelListEntity;
import cn.afterturn.easypoi.word.parse.excel.ExcelMapParse;
import cn.hutool.core.bean.BeanUtil;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xwpf.usermodel.*;
import org.apache.xmlbeans.XmlCursor;
import org.apache.xmlbeans.XmlObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.io.FileOutputStream;
import java.util.*;
public class WordParagraphHolder {
private static final Logger logger = LoggerFactory.getLogger(WordParagraphHolder1.class);
private XWPFDocument sourceDocument;
private String targetFileName;
private Map<String, Object> data;
public WordParagraphHolder(XWPFDocument sourceDocument, String targetFileName, Map<String, Object> data) {
this.sourceDocument = sourceDocument;
this.targetFileName = targetFileName;
this.data = data;
}
public String execute() throws Exception {
MyXWPFDocument second = null;
FileOutputStream fos2 = null;
try {
// 循環(huán)生成段落
Map<String, Object> data = this.data;
this.parseAllParagraphic(sourceDocument.getParagraphs(), data);
File targetFile = new File(targetFileName);
FileOutputStream fos = FileUtils.openOutputStream(targetFile);
sourceDocument.write(fos);
// 關(guān)閉流
fos.close();
sourceDocument.close();
// 循環(huán)段落賦值
second = WordCache.getXWPFDocument(targetFile.getPath());
this.evalAllParagraphic(second.getParagraphs(), data);
fos2 = FileUtils.openOutputStream(targetFile);
second.write(fos2);
} catch (Exception e) {
logger.error("生成word段落失敗:", e);
return "";
} finally {
// 關(guān)閉流
fos2.close();
second.close();
}
return targetFileName;
}
private void evalAllParagraphic(List<XWPFParagraph> paragraphs, Map<String, Object> map) throws Exception {
int size = paragraphs.size();
Map<String, Integer> indexMap = new HashMap<>();
for (int i = 0; i < size; ++i) {
XWPFParagraph paragraph = (XWPFParagraph) paragraphs.get(i);
logger.info("段落內(nèi)容：{}", paragraph.getText());
if (paragraph.getText().indexOf("(") != -1) {
Object obj = checkThisParagraphNeedIterator(paragraph, map);
String listKey = getParagraphListKey(paragraph);
Integer index = indexMap.getOrDefault(listKey, 0);
if (Objects.nonNull(obj) && obj instanceof List && index < ((List) obj).size()) {
Object o = ((List) obj).get(index);
parseParagraph(paragraph, o, listKey);
index++;
indexMap.put(listKey, index);
}
}
}
}
private void parseAllParagraphic(List<XWPFParagraph> paragraphs, Map<String, Object> map) throws Exception {
int size = paragraphs.size();
List<XWPFParagraph> paragraphList = new ArrayList<>();
// 循環(huán)找出需要復(fù)制的段落
for (int i = 0; i < size; ++i) {
XWPFParagraph paragraph = (XWPFParagraph) paragraphs.get(i);
if (paragraph.getText().indexOf("(") != -1) {
Object obj = checkThisParagraphNeedIterator(paragraph, map);
if (Objects.nonNull(obj) && obj instanceof List) {
paragraphList.add(paragraph);
}
}
}
// 復(fù)制段落
for (XWPFParagraph paragraph : paragraphList) {
System.out.println(paragraph.getText());
Object obj = checkThisParagraphNeedIterator(paragraph, map);
addParagraph(paragraph, (List) obj);
// 刪除模板段落
XWPFDocument document = paragraph.getDocument();
document.removeBodyElement(document.getPosOfParagraph(paragraph));
}
}
/**
* 復(fù)制段落
*
* @param source 原段落
* @param doc
*/
public XWPFParagraph createParagraph(XWPFParagraph source, XWPFDocument doc) {
// 使用游標(biāo)創(chuàng)建一個新行
XmlCursor cursor = source.getCTP().newCursor();
XWPFParagraph newParagraph = doc.insertNewParagraph(cursor);
newParagraph.getCTP().set(source.getCTP().copy());
return newParagraph;
}
private Object checkThisParagraphNeedIterator(XWPFParagraph paragraph, Map<String, Object> map) throws Exception {
String text = paragraph.getText().trim();
if (text != null && text.contains("fe:") && text.startsWith("(")) {
text = text.replace("!fe:", "").replace("$fe:", "").replace("fe:", "").replace("(", "");
String[] keys = text.replaceAll("\\s{1,}", " ").trim().split(" ");
Object result = PoiPublicUtil.getParamsValue(keys[0], map);
return Objects.nonNull(result) ? result : new ArrayList(0);
} else {
return null;
}
}
private String getParagraphListKey(XWPFParagraph paragraph) throws Exception {
String text = paragraph.getText().trim();
if (text != null && text.contains("fe:") && text.startsWith("(")) {
text = text.replace("!fe:", "").replace("$fe:", "").replace("fe:", "").replace("(", "");
String[] keys = text.replaceAll("\\s{1,}", " ").trim().split(" ");
return keys[0];
} else {
return null;
}
}
/**
* 賦值段落
*
* @param paragraph
* @param obj
* @throws Exception
*/
public void parseParagraph(XWPFParagraph paragraph, Object obj, String listKey) throws Exception {
String listname = paragraph.getText().trim();
boolean contains = listname.contains("fe:");
if (!contains) {
return;
}
Map<String, Object> objectMap = BeanUtil.beanToMap(obj);
parseThisParagraph(paragraph, objectMap, listKey);
}
/**
* 增加段落
*
* @param paragraph
* @param list
* @throws Exception
*/
public void addParagraph(XWPFParagraph paragraph, List<Object> list) throws Exception {
XWPFParagraph currentParagraph = paragraph;
System.out.println("start for each data list :" + list.size());
Iterator var11 = list.iterator();
while (var11.hasNext()) {
Object obj = var11.next();
this.createParagraph(currentParagraph, currentParagraph.getDocument());
}
}
/**
* 遍歷段落賦值
*
* @param paragraph
* @param map
* @throws Exception
*/
private void parseThisParagraph(XWPFParagraph paragraph, Map<String, Object> map, String listKey) throws Exception {
XWPFRun currentRun = null;
String currentText = "";
Boolean isfinde = false;
List<Integer> runIndex = new ArrayList();
XWPFRun preRun = null;
for (int i = 0; i < paragraph.getRuns().size(); ++i) {
XWPFRun run = (XWPFRun) paragraph.getRuns().get(i);
String text = run.getText(0);
if (!StringUtils.isEmpty(text)) {
if (isfinde) {
currentText = currentText + text;
if (currentText.indexOf("[") == -1) {
isfinde = false;
runIndex.clear();
} else {
runIndex.add(i);
}
if (currentText.indexOf("]") != -1) {
this.changeValues(paragraph, currentRun, currentText, runIndex, map);
currentText = "";
isfinde = false;
}
} else if (text.indexOf("[") >= 0) {
currentText = text;
isfinde = true;
currentRun = run;
} else {
currentText = "";
}
if (currentText.indexOf("]") != -1) {
this.changeValues(paragraph, currentRun, currentText, runIndex, map);
isfinde = false;
}
}
// 去除多余的字符串
if (!StringUtils.isEmpty(text)) {
if (text.indexOf("(") != -1) {
preRun = run;
} else if (text.indexOf("$fe") != -1) {
// run.setText("", 0);
// 清除第一個(
preRun.setText("", 0);
// 防止自定義前綴未被拆分為多個run,根據(jù)自定義關(guān)鍵字刪除多余前綴。例如($fe:resultList
if (text.indexOf(listKey) != -1) {
String lastText = run.getText(0);
if (StringUtils.isNotBlank(lastText) && text.indexOf(listKey) != -1) {
String replace = lastText.substring(text.indexOf(listKey) + listKey.length());
run.setText(replace, 0);
}
}
}
// 清除最后一個)
if (i == paragraph.getRuns().size() - 1) {
if (text.indexOf(")") != -1) {
if (text.length() >= 1) {
String lastText = run.getText(0);
String replace = lastText.replace(")", "");
run.setText(replace, 0);
}
}
}
}
}
}
private void changeValues(XWPFParagraph paragraph, XWPFRun currentRun, String currentText, List<Integer> runIndex, Map<String, Object> map) throws Exception {
Object obj = getRealValue(currentText, map);
if (obj instanceof ImageEntity) {
currentRun.setText("", 0);
ExcelMapParse.addAnImage((ImageEntity) obj, currentRun);
} else {
currentText = obj.toString();
PoiPublicUtil.setWordText(currentRun, currentText);
}
for (int k = 0; k < runIndex.size(); ++k) {
((XWPFRun) paragraph.getRuns().get((Integer) runIndex.get(k))).setText("", 0);
}
runIndex.clear();
}
public static Object getRealValue(String currentText, Map<String, Object> map) throws Exception {
String params = "";
while (currentText.indexOf("[") != -1) {
params = currentText.substring(currentText.indexOf("[") + 1, currentText.indexOf("]"));
Object obj = PoiElUtil.eval(params.trim(), map);
if (obj instanceof ImageEntity || obj instanceof List || obj instanceof ExcelListEntity) {
return obj;
}
if (obj != null) {
currentText = currentText.replace("[" + params + "]", obj.toString());
} else {
currentText = currentText.replace("[" + params + "]", "");
}
}
return currentText;
}
/**
* 復(fù)制表格段落
*
* @param source 原段落
* @param cell
*/
public XWPFParagraph copyTableParagraph(XWPFParagraph source, XWPFTableCell cell) {
// 使用游標(biāo)創(chuàng)建一個新行
XmlCursor cursor = source.getCTP().newCursor();
// 在游標(biāo)位置插入新段落
XWPFParagraph newParagraph = cell.insertNewParagraph(cursor);
// 復(fù)制底層 XML 對象
XmlObject copy = source.getCTP().copy();
newParagraph.getCTP().set(copy);
// 關(guān)閉游標(biāo)
cursor.dispose();
return newParagraph;
}
/**
* 表格段落復(fù)制
*
* @param document
* @param data
*/
private void createTableParagraph(XWPFDocument document, Map<String, Object> data) {
Object resultList = data.get("resultList");
if (Objects.isNull(resultList)) {
return;
}
List list = (List) resultList;
List<XWPFTable> tables = document.getTables();
for (XWPFTable table : tables) {
for (XWPFTableRow row : table.getRows()) {
for (XWPFTableCell cell : row.getTableCells()) {
XWPFParagraph xwpfParagraph = null;
List<XWPFParagraph> paragraphs = cell.getParagraphs();
for (int i = 0; i < paragraphs.size(); i++) {
XWPFParagraph paragraph = paragraphs.get(i);
String listname = paragraph.getText().trim();
if (listname.startsWith("($fe")) {
xwpfParagraph = paragraph;
}
}
if (Objects.nonNull(xwpfParagraph)) {
for (int i = 0; i < list.size() - 1; i++) {
copyTableParagraph(xwpfParagraph, cell);
}
}
}
}
}
}
/**
* 表格段落賦值
*
* @param document
* @param date
*/
private void evalTableParagraph(XWPFDocument document, Map<String, Object> date) {
List<XWPFTable> tables = document.getTables();
for (XWPFTable table : tables) {
for (XWPFTableRow row : table.getRows()) {
for (XWPFTableCell cell : row.getTableCells()) {
List<XWPFParagraph> paragraphs = cell.getParagraphs();
List<XWPFParagraph> addList = new ArrayList<>();
for (int i = 0; i < paragraphs.size(); i++) {
XWPFParagraph paragraph = paragraphs.get(i);
String listname = paragraph.getText().trim();
if (listname.startsWith("($fe")) {
addList.add(paragraph);
}
}
try {
evalAllParagraphic(addList, date);
} catch (Exception e) {
logger.error("單元格{}段落賦值異常", cell.getText(), e);
}
}
}
}
}
}
具體的調(diào)用邏輯是先執(zhí)行一次常規(guī)占位符的替換，然后再進(jìn)行段落的替換。WordParagraphHolder 中也是先生成段落，再進(jìn)行段落賦值。
代碼如下
public static File exportWord(Map<String, Object> params, File templateFile, File writeFile) {
FileOutputStream fos = null;
FileOutputStream outputStream = null;
try {
long start = System.currentTimeMillis();
logger.info("開始寫入word文件");
//獲取模板文檔
logger.info("開始寫入word模板文件路徑:{}", templateFile.getPath());
// 寫入word常規(guī)替換
XWPFDocument doc = WordExportUtil.exportWord07(templateFile.getPath(), params);
// 循環(huán)寫段落
WordParagraphHolder paragraphHolder = new WordParagraphHolder(doc, writeFile.getPath(), params);
String targetFileName = paragraphHolder.execute();
logger.info("寫入word文件完成，耗時{}", (System.currentTimeMillis() - start));
return new File(targetFileName);
} catch (Exception e) {
logger.error("寫入word文件異常:", e);
} finally {
IOUtils.closeQuietly(fos);
IOUtils.closeQuietly(outputStream);
}
return null;
}
使用方法
新建word插入如下內(nèi)容：
($fe:resultList [createDate]，我使用[number]元，購買蘋果[amount]個，截止日期[endDate]，使用支付方式[type])
其中resultList 為入?yún)ist的名稱，可以自由更換但是要和代碼里的對應(yīng)上，因?yàn)槲覀円啥鄠€段落，所以參數(shù)要構(gòu)造為list的形式。
**[createDate]**內(nèi)createDate為list中實(shí)體的字段名稱，其他的為固定格式，不要修改，生成完成后會自動刪除多余的字符串。
執(zhí)行下面的測試代碼：
public static void main(String[] args) throws Exception {
Map<String, Object> date = createDate();
String sourceFile = "d:/temp/模版word.docx";
String targetFile = "d:/temp/輸出結(jié)果.docx";
MyXWPFDocument first = WordCache.getXWPFDocument(sourceFile);
WordParagraphHolder test = new WordParagraphHolder(first, targetFile, date);
test.execute();
}
private static Map<String, Object> createDate() {
//填充數(shù)據(jù)
List<WordExportBatch> resultList = new ArrayList<>();
WordExportBatch wordExport = new WordExportBatch();
WordExportBatch wordExport1 = new WordExportBatch();
wordExport.setCreateDate("2022/9/30");
wordExport1.setCreateDate("2022/9/28");
wordExport.setNumber("11");
wordExport1.setNumber("15");
wordExport.setAmount("1234.5");
wordExport1.setAmount("2345.77");
wordExport.setEndDate("2022/12/31");
wordExport1.setEndDate("2022/11/30");
wordExport.setType("支付寶");
wordExport1.setType("微信");
resultList.add(wordExport);
resultList.add(wordExport1);
//準(zhǔn)備數(shù)據(jù)
Map<String, Object> params = new HashMap<>();
params.put("resultList", resultList);
return params;
}
看到輸出如下就大功告成了。
補(bǔ)充pom依賴
有時候項(xiàng)目里poi的版本與easypoi李的poi會沖突，需要解決一下沖突。
<dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-base</artifactId> <version>4.1.3</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml-schemas</artifactId> <version>4.1.2</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.11.0</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> </dependency> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.7.20</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.16.1</version> </dependency>
word表格里段落復(fù)制
奇怪的需求千千萬，遇到了需要在單元格內(nèi)進(jìn)行段落的循環(huán)復(fù)制。需要在生產(chǎn)段落的基礎(chǔ)上做一下調(diào)整。增加創(chuàng)建表格段落的方法，并修改execute()執(zhí)行方法。
public String execute() throws Exception {
MyXWPFDocument second = null;
FileOutputStream fos2 = null;
try {
Map<String, Object> data = this.data;
// 循環(huán)生成段落
this.parseAllParagraphic(sourceDocument.getParagraphs(), data);
// 循環(huán)生成表格段落
this.createTableParagraph(sourceDocument, data);
File targetFile = new File(targetFileName);
FileOutputStream fos = FileUtils.openOutputStream(targetFile);
sourceDocument.write(fos);
// 關(guān)閉流
fos.close();
sourceDocument.close();
second = WordCache.getXWPFDocument(targetFile.getPath());
// 循環(huán)段落賦值
this.evalAllParagraphic(second.getParagraphs(), data);
// 循環(huán)表格段落賦值
this.evalTableParagraph(second, data);
fos2 = FileUtils.openOutputStream(targetFile);
second.write(fos2);
} catch (Exception e) {
logger.error("生成word段落失敗:", e);
return "";
} finally {
// 關(guān)閉流
fos2.close();
second.close();
}
return targetFileName;
}
/**
* 復(fù)制表格段落
*
* @param source 原段落
* @param cell
*/
public XWPFParagraph copyTableParagraph(XWPFParagraph source, XWPFTableCell cell) {
// 使用游標(biāo)創(chuàng)建一個新行
XmlCursor cursor = source.getCTP().newCursor();
// 在游標(biāo)位置插入新段落
XWPFParagraph newParagraph = cell.insertNewParagraph(cursor);
// 復(fù)制底層 XML 對象
XmlObject copy = source.getCTP().copy();
newParagraph.getCTP().set(copy);
// 關(guān)閉游標(biāo)
cursor.dispose();
return newParagraph;
}
/**
* 表格段落復(fù)制
*
* @param document
* @param data
*/
private void createTableParagraph(XWPFDocument document, Map<String, Object> data) {
Object resultList = data.get("resultList");
if (Objects.isNull(resultList)) {
return;
}
List list = (List) resultList;
List<XWPFTable> tables = document.getTables();
for (XWPFTable table : tables) {
for (XWPFTableRow row : table.getRows()) {
for (XWPFTableCell cell : row.getTableCells()) {
XWPFParagraph xwpfParagraph = null;
List<XWPFParagraph> paragraphs = cell.getParagraphs();
for (int i = 0; i < paragraphs.size(); i++) {
XWPFParagraph paragraph = paragraphs.get(i);
String listname = paragraph.getText().trim();
if (listname.startsWith("($fe")) {
xwpfParagraph = paragraph;
}
}
if (Objects.nonNull(xwpfParagraph)) {
for (int i = 0; i < list.size() - 1; i++) {
copyTableParagraph(xwpfParagraph, cell);
}
}
}
}
}
}
/**
* 表格段落賦值
*
* @param document
* @param date
*/
private void evalTableParagraph(XWPFDocument document, Map<String, Object> date) {
List<XWPFTable> tables = document.getTables();
for (XWPFTable table : tables) {
for (XWPFTableRow row : table.getRows()) {
for (XWPFTableCell cell : row.getTableCells()) {
List<XWPFParagraph> paragraphs = cell.getParagraphs();
List<XWPFParagraph> addList = new ArrayList<>();
for (int i = 0; i < paragraphs.size(); i++) {
XWPFParagraph paragraph = paragraphs.get(i);
String listname = paragraph.getText().trim();
if (listname.startsWith("($fe")) {
addList.add(paragraph);
}
}
try {
evalAllParagraphic(addList, date);
} catch (Exception e) {
logger.error("單元格{}段落賦值異常", cell.getText(), e);
}
}
}
}
}
public static void main(String[] args) throws Exception {
Map<String, Object> date = createDate();
String sourceFile = "d:/temp/模版word1.docx";
String targetFile = "d:/temp/輸出結(jié)果1.docx";
MyXWPFDocument first = WordCache.getXWPFDocument(sourceFile);
WordParagraphHolder1 test = new WordParagraphHolder1(first, targetFile, date);
test.execute();
}
private static Map<String, Object> createDate() {
//填充數(shù)據(jù)
List<WordExportBatch> resultList = new ArrayList<>();
WordExportBatch wordExport = new WordExportBatch();
WordExportBatch wordExport1 = new WordExportBatch();
wordExport.setCreateDate("2022/9/30");
wordExport1.setCreateDate("2022/9/28");
wordExport.setNumber("11");
wordExport1.setNumber("15");
wordExport.setAmount("1234.5");
wordExport1.setAmount("2345.77");
wordExport.setEndDate("2022/12/31");
wordExport1.setEndDate("2022/11/30");
wordExport.setType("支付寶");
wordExport1.setType("微信");
resultList.add(wordExport);
resultList.add(wordExport1);
//準(zhǔn)備數(shù)據(jù)
Map<String, Object> params = new HashMap<>();
params.put("resultList", resultList);
return params;
}($fe:resultList [createDate]，我使用[number]元，購買蘋果[amount]個，截止日期[endDate]，使用支付方式[type])
在word中新建表格，在對應(yīng)的單元格里寫入上面需要循環(huán)的內(nèi)容。執(zhí)行測試代碼就可以看到輸出結(jié)果。
以上就是使用EasyPoi實(shí)現(xiàn)word文檔生成和段落循環(huán)的詳細(xì)內(nèi)容，更多關(guān)于EasyPoi word操作的資料請關(guān)注腳本之家其它相關(guān)文章！
相關(guān)文章
分布式事務(wù)是分布式系統(tǒng)中確保數(shù)據(jù)一致性的重要機(jī)制,它涉及多個數(shù)據(jù)源或參與者,要么所有操作全部成功,要么全部失敗,常見的解決方案包括2PC（兩階段提交協(xié)議）、3PC（三階段提交協(xié)議）和TCC（Try-Confirm-Cancel）,2PC雖然簡單但存在單點(diǎn)故障等問題2024-09-09
大多數(shù)情況下，只要不涉及線程安全問題，Map基本都可以使用HashMap，不過HashMap有一個問題，就是迭代HashMap的順序并不是HashMap放置的順序，也就是無序。HashMap的這一缺點(diǎn)往往會帶來困擾，所以LinkedHashMap就閃亮登場了，這篇文章通過源碼解析帶你了解LinkedHashMap2022-11-11
這篇文章主要給大家介紹了關(guān)于Java JDBC自定義封裝工具類的相關(guān)資料，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧2021-02-02
本文通過圖文并茂的形式給大家介紹的hibernate4基本實(shí)現(xiàn)原理，非常不錯，具有參考借鑒價值，需要的朋友參考下吧2017-09-09
Java利用Dijkstra算法求解拓?fù)潢P(guān)系最短路徑
迪杰斯特拉算法(Dijkstra)是由荷蘭計(jì)算機(jī)科學(xué)迪家迪杰斯特拉于1959年提出的，因此又叫狄克斯特拉算法。本文將利用迪克斯特拉（Dijkstra）算法求拓?fù)潢P(guān)系最短路徑，感興趣的可以了解一下2022-07-07
Java中的Monad設(shè)計(jì)模式及其實(shí)現(xiàn)過程
本文介紹了Java中的Monad設(shè)計(jì)模式及其在函數(shù)式編程中的應(yīng)用,雖然Java不是函數(shù)式編程語言,但可以通過接口和泛型模擬Monad的行為,實(shí)現(xiàn)鏈?zhǔn)秸{(diào)用和上下文管理,通過一個示例展示了如何使用OptionalMonad進(jìn)行鏈?zhǔn)秸{(diào)用,并解析了Monad接口和OptionalMonad的實(shí)現(xiàn)細(xì)節(jié)2025-03-03
這篇文章主要介紹了如何在阿里云上申請短信服務(wù)以及如何使用Java代碼進(jìn)行對接,包括申請資質(zhì)、簽名和模板,以及編寫Java代碼整合成工具類進(jìn)行調(diào)用的步驟,需要的朋友可以參考下2024-12-12
Java微信公眾平臺開發(fā)（11） 微信三大平臺的關(guān)聯(lián)
這篇文章主要介紹了Java微信公眾平臺開發(fā)第十一步，微信開發(fā)中微信公眾平臺、開放平臺和商戶平臺的關(guān)聯(lián)，具有一定的參考價值，感興趣的小伙伴們可以參考一下2017-04-04
這篇文章主要介紹了Java實(shí)現(xiàn)的簡單音樂播放器功能,涉及java針對多媒體文件相關(guān)載入、播放相關(guān)操作技巧,需要的朋友可以參考下2019-02-02
這篇文章主要介紹了Java內(nèi)部類和匿名內(nèi)部類的用法說明，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧2020-08-08