BeanUtils 读取数据

前两篇文章都是关于setProperty的，下面来说一个关于getProperty 的小案例。如下：

MyClass.java

package beanutils;public class MyClass {    private String classname;    public String getClassname() {        return classname;    }    public void setClassname(String classname) {        this.classname = classname;    }}

MyBean.java

package beanutils;import java.util.Date;public class MyBean {    private String name;    private int age;    private Date birthday;    private boolean isAlive;    private MyClass myclass;    public MyClass getMyclass() {        return myclass;    }    public void setMyclass(MyClass myclass) {        this.myclass = myclass;    }    public MyBean() {    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public boolean isAlive() {        return isAlive;    }    public void setAlive(boolean isAlive) {        this.isAlive = isAlive;    }}

AdvanceBean.java

package beanutils;import java.util.List;/** * 提供了集合的形式获取 *  * @author Administrator * */public class AdvanceBean {    private List list;    private MyClass myclass;    public MyClass getMyclass() {        return myclass;    }    public void setMyclass(MyClass myclass) {        this.myclass = myclass;    }    public List getList() {        return list;    }    public void setList(List list) {        this.list = list;    }}

TestAdvanceBean.java

package beanutils;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import org.apache.commons.beanutils.BeanUtils;import org.apache.commons.beanutils.ConvertUtils;import org.apache.commons.beanutils.Converter;import org.apache.commons.beanutils.locale.converters.DateLocaleConverter;import org.junit.Test;public class TestAdvanceBean {    /**     * 简单的测试基本数据类型的数据的getProperty方法     *      * @throws Exception     */    @Test    public void test1() throws Exception {        String name = "Molly";        int age = 20;        Boolean isAlive = true;        MyBean myBean = new MyBean();        BeanUtils.setProperty(myBean, "name", name);        BeanUtils.setProperty(myBean, "age", age);        System.out.println("Name: " + BeanUtils.getProperty(myBean, "name"));        System.out.println("Age: " + BeanUtils.getProperty(myBean, "age"));    }    /**     * 对于boolean数据类型，由于其setter，getter方法不符合标准，所以不能正确的获得输出结果     *      * java.lang.NoSuchMethodException: Unknown property 'isAlive' on class     * 'class beanutils.MyBean'     *      * @throws Exception     */    @Test    public void test2() throws Exception {        MyBean myBean = new MyBean();        boolean isAlive = false;        BeanUtils.setProperty(myBean, "isAlive", isAlive);        System.out.println("Name: " + BeanUtils.getProperty(myBean, "name"));        System.out.println("Age: " + BeanUtils.getProperty(myBean, "age"));        System.out.println("IsAlive: " + BeanUtils.getProperty(myBean, "isAlive"));    }    /**     * 对Date数据类型<br>     * 进行测试 使用内置的转换器     *      * @throws Exception     */    @Test    public void test3() throws Exception {        String birthday = "2016-07-05";        MyBean myBean = new MyBean();        ConvertUtils.register(new DateLocaleConverter(), Date.class);        BeanUtils.setProperty(myBean, "birthday", birthday);        System.out.println(BeanUtils.getProperty(myBean, "birthday"));    }    /**     * 对Date数据类型<br>     * 进行测试 使用z自定义的转换器     *      * @throws Exception     */    @Test    public void test4() throws Exception {        String birthday = "2016-07-05 11:59:59";        MyBean myBean = new MyBean();        ConvertUtils.register(new Converter() {            @Override            public <T> T convert(Class<T> type, Object value) {                try {                    String data = (String) value;                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");                    return (T) sdf.parse(data);                } catch (Exception e) {                    throw new RuntimeException(e.getMessage());                }            }        }, Date.class);        BeanUtils.setProperty(myBean, "birthday", birthday);        System.out.println(BeanUtils.getProperty(myBean, "birthday"));    }    /**     * 测试 组合类中的property获取 <br>     * 支持内嵌类数据的读取，但是不支持内嵌类的直接的读取     *      * @throws Exception     */    @Test    public void test5() throws Exception {        MyClass myclass = new MyClass();        myclass.setClassname("软件学院软件开发与测试1414班");        MyBean myBean = new MyBean();        BeanUtils.setProperty(myBean, "myclass", myclass);        System.out.println(BeanUtils.getProperty(myBean, "myclass.classname"));    }    /**     * 对于list等数据的getProperty测试<br>     *      * 默认获得第一个列表项的内容，也可以指定下标进行内容的读取     *      * @throws Exception     */    @Test    public void test6() throws Exception {        List<String> list = new ArrayList<String>();        for (int i = 0; i < 7; i++) {            list.add("列表项" + i);        }        AdvanceBean advanceBean = new AdvanceBean();        BeanUtils.setProperty(advanceBean, "list", list);        System.out.println(BeanUtils.getProperty(advanceBean, "list").toString());        System.out.println(BeanUtils.getProperty(advanceBean, "list[1]").toString());        System.out.println(BeanUtils.getProperty(advanceBean, "list[6]").toString());    }}

总结

代码很详细，就不再废话了。

最后一点需要提醒的是，导好包！导对包！思路很重要！