maven需要引入的JAR

        <dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version></dependency><dependency><groupId>commons-collections</groupId><artifactId>commons-collections</artifactId><version>3.2.2</version></dependency><dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.9.2</version></dependency>

MyPredicate.java

import java.math.BigDecimal;import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.collections.Predicate;public class MyPredicate implements Predicate {private String property;private Object value;public MyPredicate(String property, Object value) {this.property = property;this.value = value;}public boolean evaluate(Object object) {try {Object beanValue;if (property.indexOf(".") > 0) {beanValue = PropertyUtils.getNestedProperty(object, property);} else {beanValue = PropertyUtils.getProperty(object, property);}if (beanValue == null) {return false;}if (!value.getClass().equals(beanValue.getClass())) {throw new RuntimeException("value.class!=beanValue.class");}return myCompare(beanValue, value);} catch (Exception e) {throw new RuntimeException(e.getMessage(), e.getCause());}}private boolean myCompare(Object value, Object beanValue) {if (beanValue.getClass().equals(Integer.class)) {if ((beanValue).equals(value)) {return true;}}if (beanValue.getClass().equals(BigDecimal.class)) {if (((BigDecimal) beanValue).compareTo((BigDecimal) value) == 0) {return true;}}if (beanValue.getClass().equals(String.class)) {if (beanValue.toString().equals(value.toString())) {return true;}}if (beanValue.getClass().equals(Double.class)) {if ((beanValue).equals(value)) {return true;}} else {if (beanValue == value) {return true;}}return false;}}

测试方法

import org.andy.work.entity.UserEntity;
import org.andy.work.util.MyPredicate;
import org.apache.commons.collections.CollectionUtils;
import org.junit.Test;
import org.apache.commons.collections.Predicate;
import java.util.ArrayList;
import java.util.List;@Testpublic void test() {List<UserEntity> list = new ArrayList<UserEntity>();UserEntity userEntity1 = new UserEntity(1, "吕布", "111");UserEntity userEntity2 = new UserEntity(2, "孙权", "222");UserEntity userEntity3 = new UserEntity(3, "吕布", "333");UserEntity userEntity4 = new UserEntity(4, "刘备", "444");UserEntity userEntity5 = new UserEntity(5, "张飞", "555");list.add(userEntity1);list.add(userEntity2);list.add(userEntity3);list.add(userEntity4);list.add(userEntity5);UserEntity userEntity6 = new UserEntity(6, "吕布", "666");Predicate isProblem = new MyPredicate("name", userEntity6.getName());List<UserEntity> result = (List<UserEntity>) CollectionUtils.select(list, isProblem);System.out.println(result.toString());}

输出打印

[UserEntity{id=1, name='吕布', password='111'}, UserEntity{id=3, name='吕布', password='333'}]