Sun公司的內省API過于繁瑣，所以Apache組織結合很多實際開發中的應用場景開發了一套簡單、易用的API操作Bean的屬性——BeanUtils，在Beanutil中可以直接進行類型的自動轉換。

BeanUtil工具包下載：

??1，登錄http://commons.apache.org/beanutils/

??2,??點擊Download

??3,?點擊commons-beanutils-1.9.2-bin.zip（commons-logging-1.1.3-src）進行下載就OK了

使用BeanUtil

在項目中導入commons-beanutils-1.9.2.jar包即可(PS:把此jar包復制到項目的lib文件夾，右擊包，選build path==>add to build path 顯示奶瓶即可)

另外：commons-beanutils-1.9.2.jar 要與?commons-logging-1.1.3.Jar共用。

1 import java.lang.reflect.InvocationTargetException; 2 import java.text.ParseException; 3 import java.text.SimpleDateFormat; 4 import java.util.Date; 5 import java.util.HashMap; 6 import java.util.Map; 7 8 import org.apache.commons.beanutils.BeanUtils; 9 import org.apache.commons.beanutils.ConversionException; 10 import org.apache.commons.beanutils.ConvertUtils; 11 import org.apache.commons.beanutils.Converter; 12 import org.apache.commons.beanutils.locale.converters.DateLocaleConverter; 13 import org.junit.Test; 14 15 16 17 //使用beanUtils操縱bean屬性（第三方） 18 public class Demo { 19 20 /** 21 * 22 * @throws Exception 23 * 24 */ 25 @Test 26 public void test1() throws Exception{ 27 28 Person p = new Person(); 29 30 BeanUtils.setProperty(p, "name", "zero"); 31 32 System.out.println(p.getName()); 33 34 } 35 36 @Test 37 public void test2() throws Exception{ 38 39 String name = "aaaa"; 40 String password = "123"; 41 String age = "34"; 42 43 Person p = new Person(); 44 45 BeanUtils.setProperty(p, "name", name);//只支持8種基本數據類型 46 BeanUtils.setProperty(p, "password", password); 47 BeanUtils.setProperty(p, "age", age); 48 49 System.out.println(p.getName()+"*"+p.getPassword()+"*"+p.getAge()); 50 51 } 52 53 @Test 54 public void test3() throws Exception{ 55 56 String name = "aaaa"; 57 String password = "123"; 58 String age = "34"; 59 String birthday = "1900-1-1"; 60 61 //為了讓日期賦到bean的birthday屬性上，給beanUtils注冊一個日期轉換 62 ConvertUtils.register(new Converter(){ 63 64 @Override 65 public Object convert(Class type, Object value) { 66 67 if(value==null){ 68 return null; 69 } 70 if(!(value instanceof String)){ 71 throw new ConversionException("only support String"); 72 } 73 74 String str = (String) value; 75 76 if(str.trim().equals("")){ 77 return null; 78 } 79 80 SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd"); 81 82 try { 83 return df.parse(str); 84 } catch (ParseException e) { 85 throw new RuntimeException(e); 86 } 87 88 } 89 90 },Date.class); 91 92 Person p = new Person(); 93 94 BeanUtils.setProperty(p, "name", name);//只支持8種基本數據類型 95 BeanUtils.setProperty(p, "password", password); 96 BeanUtils.setProperty(p, "age", age); 97 BeanUtils.setProperty(p, "birthday", birthday); 98 99 System.out.println(p.getName()+"*"+p.getPassword()+"*"+p.getAge()+"*"+p.getBirthday()); 100 101 } 102 103 @Test 104 public void test4() throws Exception{ 105 106 String name = "aaaa"; 107 String password = "123"; 108 String age = "34"; 109 String birthday = "1998-1-1"; 110 111 ConvertUtils.register(new DateLocaleConverter(), Date.class); 112 113 Person p = new Person(); 114 115 BeanUtils.setProperty(p, "name", name);//只支持8種基本數據類型 116 BeanUtils.setProperty(p, "password", password); 117 BeanUtils.setProperty(p, "age", age); 118 BeanUtils.setProperty(p, "birthday", birthday); 119 120 Date date = p.getBirthday(); 121 122 System.out.println(p.getName()+"*"+p.getPassword()+"*"+p.getAge()+"*"+date.toLocaleString()); 123 124 } 125 126 @Test 127 public void test5() throws Exception{ 128 129 Map map = new HashMap(); 130 map.put("name", "zero"); 131 map.put("password", "521212"); 132 map.put("age", "33"); 133 map.put("birthday", "1998-1-1"); 134 135 ConvertUtils.register(new DateLocaleConverter(), Date.class); 136 137 Person p = new Person(); 138 139 BeanUtils.populate(p, map);//用map集合的值，填充bean的屬性值 140 141 System.out.println(p.getName()+"*"+p.getPassword()+"*"+p.getAge()+"*"+p.getBirthday()); 142 143 } 144 145 } View Code 1 import java.util.Date; 2 3 4 public class Person {// javabean 5 6 private String name; 7 private String password; 8 private int age; 9 private Date birthday; 10 11 public Date getBirthday() { 12 return birthday; 13 } 14 15 public void setBirthday(Date birthday) { 16 this.birthday = birthday; 17 } 18 19 public String getName() { 20 return name; 21 } 22 23 public void setName(String name) { 24 this.name = name; 25 } 26 27 public String getPassword() { 28 return password; 29 } 30 31 public void setPassword(String password) { 32 this.password = password; 33 } 34 35 public int getAge() { 36 return age; 37 } 38 39 public void setAge(int age) { 40 this.age = age; 41 } 42 43 public String getAb(){ 44 return null; 45 } 46 47 48 } View Code

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轉載于:https://www.cnblogs.com/aineko/p/3793489.html

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