Provides common utility classes, including collection manipulation, object manipulation, enumeration caching, LRU caching, timers, Word document character template replacement, amount tools, API calling tools, and more.
- ListUtil: conditional grouping, conditional de-duplication, conditional search (single, multiple), conditional search maximum, set illegal check
- ObjectUtil: remove all empty string of member variables, find member variables, map member variables to key-value, illegal validation
- EnumUtil: provide two ways to obtain enumeration values with cache and without cache, improve the efficiency of enumeration value search O(n)->O(1)
- LRUCache: bidirectional linked list and HashMap implementation, queued by recent use, cache reaches a threshold, the least used elements will be removed
- DocxUtil: replace the document, table template characters, the table can increase the line.
- MoneyUtil: Translate the figure amount into Chinese capitals.
- API Call: encapsulate API interface call process and optimize code structure.
- TimeCounter: Good timing tool
package com.megetood.example;
import com.megetood.example.enums.CoinEnum;
import com.megetood.util.EnumUtil;
import org.springframework.util.Assert;
import java.util.Optional;
/**
* EnumUtil Example
*
* @author Chengdong Lei
* @date 2021/1/26
*/
public class EnumUtilExample {
public static void main(String[] args) {
int key = 5;
CoinEnum targetEnum = CoinEnum.NICKEL;
// 枚举类设计缓存
CoinEnum anEnum = CoinEnum.getEnum(key);
Assert.isTrue(targetEnum.equals(anEnum),"不相等");
// 使用缓存
Optional<CoinEnum> enumWithCache = EnumUtil.getEnumWithCache(CoinEnum.class, CoinEnum::getValue, key);
Assert.isTrue(enumWithCache.isPresent(),"不存在");
Assert.isTrue(targetEnum.equals( enumWithCache.get()),"不相等");
// 不使用缓存（遍历）
Optional<CoinEnum> enumResult = EnumUtil.getEnum(CoinEnum.class, CoinEnum::getValue, key);
Assert.isTrue(enumResult.isPresent(),"不存在");
Assert.isTrue(targetEnum.equals(enumResult.get()),"不相等");
}
}- Add dependency
<dependency>
<groupId>pl.jsolve</groupId>
<artifactId>templ4docx</artifactId>
<version>2.0.2</version>
</dependency>- Add your code
package com.megetood.example;
import com.megetood.util.DocxUtil;
import com.megetood.util.FileUtil;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* DocxUtil Example
*
* @author Chengdong Lei
* @date 2021/1/26
*/
public class DocxUtilExample {
public static void main(String[] args) {
// file path is "resource/docx/template.docx"
String filePath = FileUtil.getSharedDataDir() + "docx\\template.docx";
String outputPath = FileUtil.getSharedDataDir() + "docx\\template01.docx";
HashMap<String, String> textMap = new HashMap<>();
textMap.put("poNum", "poNum123");
textMap.put("supplierName", "供应商123");
textMap.put("amount", "10000");
Map<String, String> rowMap = new HashMap<>();
rowMap.put("num", "1");
rowMap.put("itemCode", "wl123");
rowMap.put("uomName", "元");
rowMap.put("quantity", "20");
Map<String, String> rowMap2 = new HashMap<>();
rowMap2.put("num", "2");
rowMap2.put("itemCode", "wl223");
rowMap2.put("uomName", "元");
rowMap2.put("quantity", "30");
List<Map<String, String>> table = Arrays.asList(rowMap, rowMap2);
DocxUtil.WordVariable wordVariable = new DocxUtil.WordVariable(textMap, Arrays.asList(table));
DocxUtil.builder(filePath)
.addPattern(new DocxUtil.Pattern("#{", "}"))
.replaceTemplate(wordVariable)
.toFilePath(outputPath);
}
}package com.megetood.example;
import com.megetood.util.MoneyUtil;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.List;
/**
* MoneyUtil Example
*
* @author Chengdong Lei
* @date 2021/1/26
*/
public class MoneyUtilExample {
public static void main(String[] args) throws UnsupportedEncodingException {
List<BigDecimal> list = Arrays.asList(
BigDecimal.valueOf(140330701101.23),
BigDecimal.valueOf(0.00),
BigDecimal.valueOf(-1),
BigDecimal.valueOf(0.23),
BigDecimal.valueOf(1001.1)
);
for (BigDecimal value : list) {
System.out.println("您输入的金额（小写）为：" + value);
System.out.println("您输入的金额（大写）为：" + MoneyUtil.toCNWords(value));
}
}
}Using lambda expressions, functional programming ideas
package com.megetood.example;
import com.megetood.util.TimeCounter;
/**
* TimeConter Example
*
* @author Chengdong Lei
* @date 2021/1/26
*/
public class TimeCounterExample {
public static void main(String[] args) {
exmaple1();
exmaple2();
}
private static void exmaple2() {
TimeCounter.count(startTime -> doSomething()).between().print();
}
private static void exmaple1() {
TimeCounter timeCounter = new TimeCounter();
timeCounter.start();
// do something
doSomething();
timeCounter.end();
timeCounter.between().print();
}
private static void doSomething() {
for (int i = 0; i < 10000000; i++) {
// do something
}
}
}