Apache Commons 常用工具类整理
public>/** * 从一个entity中把属性复制进另外一个entity中
*
*
@throws Exception*/ @Test
public void testCopyNewBean() throws Exception { StuForm form
= new StuForm("lee", 18, 1, new Date(), true); Stu stu
= new Stu(); BeanUtils.copyProperties(form, stu);
System.out.println(stu.toString());
}
/** * base64 加密解密
*
*
@throws Exception*/ @Test
public void testBase64Code() throws Exception { String name1
= "hello, my name is lee~"; System.out.println(
"Before: " + name1); String name2
= Base64.encodeBase64String(name1.getBytes()); System.out.println(
"After encode: " + name2); String name3
= new String(Base64.decodeBase64(name2)); System.out.println(
"After decode: " + name3); String url1
= "www.lee.com.cn"; System.out.println(
"URL Before: " + url1); String url2
= Base64.encodeBase64URLSafeString(url1.getBytes()); System.out.println(
"URL After decode: " + url2); String url3
= new String(Base64.decodeBase64(url2)); System.out.println(
"URL After decode: " + url3); }
/** * commons 下 collection 工具包
*
*
@throws Exception*/ @Test
public void testCollection() throws Exception { OrderedMap
<String, Object> om = new LinkedMap<String, Object>(); om.put(
"one", 1); om.put(
"two", "2"); om.put(
"three", "three"); om.put(
"fore", 4); om.put(
"five", "5"); System.out.println(om.firstKey());
System.out.println(om.nextKey(
"fore")); System.out.println(om.previousKey(
"five")); System.out.println(
"=============================="); BidiMap bm
= new TreeBidiMap(); bm.put(
"three", "3"); bm.put(
"five", "isfive"); System.out.println(bm.getKey(
"isfive").toString()); System.out.println(bm.get(
"three"));// 交换key和value BidiMap newMap = bm.inverseBidiMap();
System.out.println(newMap.size());
System.out.println("==============================");
Bag<Object> bag = new HashBag<Object>();
bag.add("abc");
bag.add("def", 3);
bag.add("ghi", 5);
System.out.println(bag.size());
// 过滤重复元素
Set<Object> onlyU = bag.uniqueSet();
Iterator<Object> i = onlyU.iterator();
while(i.hasNext()){
Object o = i.next();
System.out.println(o.toString());
}
}
/**
* Apache Commons Configuration
*
* @throws Exception
*/
@Test
public void testConfig() throws Exception {
PropertiesConfiguration p = new PropertiesConfiguration("test.properties");
System.out.println(p.getString("boy.name"));
System.out.println(p.getInt("boy.age"));
System.out.println(p.getString("boy.birth"));
p.setHeader("##this is a new string##");
p.setProperty("new.string", "newString");
// 保存在编译后的目录中
p.save();
p.save("newP");
}
/**
* Apache Commons Lang
*
* @throws Exception
*/
@Test
public void testLang() throws Exception {
String a1[] = {"1", "2", "3"};
String a2[] = {"a", "b", "c"};
// 合并数组
String a3[] = (String[])ArrayUtils.addAll(a1, a2);
for (String s : a3) {
System.out.println(s);
}
System.out.println("==============================");
String str = "hello, my name is hanmeimei! what's your name? name";
// 出现第一个和第二个name之间的string
String s1 = StringUtils.substringBetween(str, "name");
System.out.println("s1: " + s1);
// 截取第一次出现的字符串之间的string
String s2 = StringUtils.substringBetween(str, "name", "your");
System.out.println("s2: " + s2);
// StringUtils.substringAfter(str, separator)
// StringUtils.substringBefore(str, separator)
System.out.println("==============================");
// 判断该字符串是不是为数字(0~9)组成，如果是，返回true 但该方法不识别有小数点
System.out.println(StringUtils.isNumeric("454534"));
System.out.println("==============================");
System.out.println(ClassUtils.getShortClassName(Test.class));
System.out.println(ClassUtils.getPackageName(Test.class));
System.out.println("==============================");
// 判断该字符串是不是为数字(0~9)组成，如果是，返回true 可以识别有小数点
System.out.println(NumberUtils.isNumber("12334.11"));
// 不建议使用，可以使用 Integer.valueOf("")
System.out.println(NumberUtils.stringToInt("33"));
System.out.println(Integer.valueOf("33"));
// 五位的随机字母和数字
System.out.println(RandomStringUtils.randomAlphanumeric(5));
System.out.println(StringEscapeUtils.escapeHtml("<html>"));
System.out.println(StringEscapeUtils.escapeJava("String"));
// StringUtils,判断是否是空格字符
System.out.println(StringUtils.isBlank(" "));
// StringUtils.isEmpty("");
// 将数组中的内容以,分隔
System.out.println(StringUtils.join(a3, ","));
// 在右边加下字符,使之总长度为6
System.out.println(StringUtils.rightPad("abc", 6, 'T'));
// 首字母大写
System.out.println(StringUtils.capitalize("abc"));
// Deletes all whitespaces from a String 删除所有空格
System.out.println(StringUtils.deleteWhitespace(" abc"));
// 判断是否包含这个字符
System.out.println(StringUtils.contains("abc", "ba"));
// 表示左边两个字符
System.out.println(StringUtils.left("abc", 2));
}
}
页:
[1]