1. beanUtils工程

1.工程目錄

2.需要的jar包：
commons-beanutils-1.9.3.jar
commons-collections-3.2.2.jar
commons-logging-1.2.jar
3.轉換器
DateConverter.java:

package com.my.model;import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date;import org.apache.commons.beanutils.ConvertUtils; import org.apache.commons.beanutils.converters.AbstractConverter; import org.apache.commons.beanutils.converters.DateTimeConverter;public class DateConverter<T> extends org.apache.commons.beanutils.converters.DateTimeConverter {private SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");@Override/*** arg0 轉換的目的類型* arg1 需要轉換的數(shù)值* @return 返回轉換后的數(shù)值*/public <T> T convert(Class<T> clz, Object value) {//1.轉換的類型是否符合要求if(Date.class!=clz) {return null;}if(value instanceof String) {try {return (T) sdf.parse((String)value);} catch (ParseException e) {e.printStackTrace();}}return null;}@Overrideprotected Object convertArray(Object arg0) {return super.convertArray(arg0);}@Overrideprotected Class<?> getDefaultType() {return null;}}

PointConvert.java:

package com.my.model;import org.apache.commons.beanutils.converters.AbstractConverter;public class PointConvert<T> extends AbstractConverter{@Overridepublic <T> T convert(Class<T> clz, Object value) {if(Point.class!=clz) {return null;}if(value instanceof String) {String val=(String)value;String[] strArray=val.split(",");if(strArray.length<2) {return null;}int x=0, y=0;try {x=Integer.parseInt(strArray[0]);y=Integer.parseInt(strArray[1]);}catch(NumberFormatException e) {e.printStackTrace();}return (T) new Point(x, y);}return null;}@Overrideprotected <T> T convertToType(Class<T> arg0, Object arg1) throws Throwable {// TODO Auto-generated method stubreturn null;}@Overrideprotected Class<?> getDefaultType() {// TODO Auto-generated method stubreturn null;}}

4.model類
Point.java:

package com.my.model;public class Point{private int x;private int y;public int getX() {return x;}public void setX(int x) {this.x = x;}public int getY() {return y;}public void setY(int y) {this.y = y;}public Point(int x, int y) {this.x = x;this.y = y;}public Point() {}@Overridepublic String toString() {return "Point [x=" + x + ", y=" + y + "]";} }

User.java:

package com.my.model;import java.util.Date;public class User {private int id;private String username;private int age;private String password;private Date born;private Point point;public Point getPoint() {return point;}public void setPoint(Point point) {this.point = point;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public Date getBorn() {return born;}public void setBorn(Date born) {this.born = born;}public User(int id, String username, int age, String password, Date born) {super();this.id = id;this.username = username;this.age = age;this.password = password;this.born = born;}public User() {}public User(int id, String username, int age, String password, Date born, Point point) {this.id = id;this.username = username;this.age = age;this.password = password;this.born = born;this.point = point;}@Overridepublic String toString() {return "User [id=" + id + ", username=" + username + ", age=" + age + ", password=" + password + ", born="+ born + ", point=" + point + "]";}}

5.Junit測試類:
TestBeanUtils.java：

package com.my.test;import static org.junit.Assert.*;import java.lang.reflect.InvocationTargetException; import java.util.Date;import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.beanutils.ConvertUtils; import org.junit.After; import org.junit.Test;import com.my.model.DateConverter; import com.my.model.Point; import com.my.model.PointConvert; import com.my.model.User;public class TestBeanUtils {@Testpublic void test01() {User user=new User();User user2=new User();String key="username";String value="張三";try {BeanUtils.copyProperty(user, key, value);BeanUtils.copyProperty(user, "age", 1);BeanUtils.copyProperty(user, "age", "20");BeanUtils.copyProperty(user, "dass", value);//DateConverter does not support default String to 'Date' conversion.//這時候需要自己定義相應的轉換器來完成轉換//定義轉換器的步驟://1創(chuàng)建一個類讓其實現(xiàn)Converter接口.//2.覆蓋convert方法,在這個方法中實現(xiàn)轉換//3.拷貝屬性之前注冊轉換器//注冊Date類型的轉換器DateConverterConvertUtils.register(new DateConverter<>(), Date.class);ConvertUtils.register(new PointConvert<>(), Point.class);BeanUtils.copyProperty(user, "born", "1997-2-20");BeanUtils.copyProperty(user, "point", "10,12");//BeanUtils.copyProperty(user, "born", new Date());BeanUtils.copyProperties(user2, user);} catch (IllegalAccessException | InvocationTargetException e) {e.printStackTrace();}System.out.println(user);System.out.println(user2);}}

運行結果:

User [id=0, username=張三, age=20, password=null, born=Thu Feb 20 00:00:00 CST 1997, point=Point [x=10, y=12]] User [id=0, username=張三, age=20, password=null, born=null, point=null]

2.beanUtils封裝請求參數(shù)

/*** * @param clz,目標類的類型* @param request，請求* @return 目標類型的對象*/public static Object setParam(Class<?> clz, HttpServletRequest request) {Map<String, String[]> paramMap=request.getParameterMap();Set<String> strSet=paramMap.keySet();Object object=null;try {object=clz.newInstance();} catch (InstantiationException | IllegalAccessException e) {e.printStackTrace();}for(String str: strSet) {LogUtil.printLog(str+": "+paramMap.get(str)[0]+" |"+object);try {String[] paramValue=paramMap.get(str);if(paramValue.length>1) {BeanUtils.setProperty(object, str, paramValue);}else {BeanUtils.setProperty(object, str, paramValue[0]);}} catch (IllegalAccessException | InvocationTargetException e) {e.printStackTrace();}}return object;}

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