使用BeanUtils操作Javabean

  最近学习使用到了BeanUtils对Javabean进行一些操作和处理，回想从安装BeanUtils到使用其对Javabean进行操作处理和运用，此处做个简单的总结：

  首先是下载BeanUtils工具包，注意需要下载logging.jar并导入后才可使程序正常运行：

  1.登录https://commons.apache.org/proper/commons-beanutils/download_beanutils.cgi

  2.在下载页面中的Binaries中选择一个，例如commons-beanutils-1.9.3-bin.tar.gz，点击下载即可。

  3.登录https://commons.apache.org/proper/commons-logging/download_logging.cgi

  4.在下载页面中的Binaries中选择一个，例如commons-logging-1.2-bin.tar.gz，点击下载即可。

  然后在IDE中导入jar包：

  个人偏爱使用Intellij IDEA，这里说说在idea中导入这两个jar包，打开IDEA的界面后，点击“File---->Project Structure---->Modules”，然后点击中间的<Modules source>然后点击右边的“+”号选择你所保存jar包的路径添加jar包，需要添加：commons-beanutils-1.9.3.jar和commons-logging-1.2.jar，点击Apply和OK即可。

4000

然后这里简单应用一下Beanutils，将数据填充至bean中，代码中有使用自定义转换器和使用BeanUtils中的转换器：

先上bean的代码：

package beanUtils;

import java.util.Date;

/**
* Created by jiangxs on 2017/9/27.
*/
public class Person {

private String name;
private int number;
private int age;
private Date birthday;

public String getName() {
return name;
}

public Date getBirthday() {
return birthday;
}

public void setBirthday(Date birthday) {
this.birthday = birthday;
}

public void setName(String name) {
this.name = name;
}

public int getNumber() {
return number;
}

public void setNumber(int number) {
this.number = number;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getadc(){
return "abc";
}
}

下面是使用BeanUtils的代码示例：
package beanUtils;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConversionException;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.Converter;
import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;
import org.junit.Test;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
* Created by jiangxs on 2017/9/27.
*/
public class Demo1 {

//使用BeanUtils操作bean并修改bean中数据
@Test
public void test1() throws Exception{
Person p = new Person();
BeanUtils.setProperty(p,"name","jxs");
System.out.println(p.getName());
}

//使用BeanUtils将八种基本数据类型填充至bean
@Test
public void test2() throws Exception{
String name = "jxs";
String number = "12345";
String age = "23";

Person p = new Person();
BeanUtils.setProperty(p,"name",name);
BeanUtils.setProperty(p,"number",number);
BeanUtils.setProperty(p,"age",age);

System.out.println(p.getName());
System.out.println(p.getNumber());
System.out.println(p.getAge());
}

//自行实现接口，转换Date类型
@Test
public void test3() throws Exception{
String name = "jxs";
String number = "12345";
String age = "23";
String birthday = "1994-01-30";

//为使得BeanUtils.setproperty支持将日期赋到bean的birthday属性上，给beanUtils注册一个日期转换器
//convert:Converter to be registered
//Date.class:Destination class for conversions performed by this Converter
ConvertUtils.register(new Converter() {
@Override
public <T> T convert(Class<T> type, Object value) {
if (value == null)
return null;
if (!(value instanceof String))
throw new ConversionException("只支持String类型");
String str = (String) value;
if (str.trim().equals(""))
return null;

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
try {
return (T) dateFormat.parse(str);
}
catch (ParseException e){
throw new RuntimeException(e);//异常链不能断
}

}
}, Date.class);

Person p = new Person();
BeanUtils.setProperty(p,"name",name);
BeanUtils.setProperty(p,"number",number);
BeanUtils.setProperty(p,"age",age);
BeanUtils.setProperty(p,"birthday",birthday);

System.out.println(p.getName());
System.out.println(p.getNumber());
System.out.println(p.getAge());
System.out.println(p.getBirthday());
}

//使用DateLocaleConverter()转换Date类型，健壮性不如test3()
@Test
public void test4() throws Exception{
String name = "jxs";
String number = "12345";
String age = "23";
String birthday = "1994-01-30";

ConvertUtils.register(new DateLocaleConverter(),Date.class);

Person p = new Person();
BeanUtils.setProperty(p,"name",name);
BeanUtils.setProperty(p,"number",number);
BeanUtils.setProperty(p,"age",age);
BeanUtils.setProperty(p,"birthday",birthday);

System.out.println(p.getName());
System.out.println(p.getNumber());
System.out.println(p.getAge());
System.out.println(p.getBirthday());
}

//使用BeanUtils.populate()，将map中的数据填充至bean中
@Test
public void test5() throws Exception{
Map map = new HashMap();
map.put("name","jxs");
map.put("number","12345");
map.put("age","23");
map.put("birthday","1994-01-30");

ConvertUtils.register(new DateLocaleConverter(),Date.class);

Person p = new Person();
BeanUtils.populate(p,map);

System.out.println(p.getName());
System.out.println(p.getNumber());
System.out.println(p.getAge());
System.out.println(p.getBirthday());
}
}

test1()函数测试结果：
jxs

Process finished with exit code 0
test2()函数测试结果：
jxs
12345
23

Process finished with exit code 0

test3();test4();test5();测试出结果相同，如下：
jxs
12345
23
Sun Jan 30 00:00:00 CST 1994

Process finished with exit code 0