public class TestBean extends BaseBean {    private int id;    private String name;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

public class Test {    public static void main(String[] args) {        TestBean testBean = new TestBean();        System.out.println("默认值：" + testBean.toString());        testBean.setId(10010);        testBean.setName("李四");        System.out.println("赋值之后：" + testBean.toString());    }}

 

import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.LinkedHashMap;public class ToStringUtils {    public static final String GET = "get";    /**     * 返回JavaBena的toString方法值     *      * @param t     * @return String     */    public static 
     
       String getToString(T t) {        String result = null;        Field[] fields = t.getClass().getDeclaredFields(); // 获取实体类的所有属性，返回Field数组        LinkedHashMap
      
        map = new LinkedHashMap
       
        ();        for (Field field : fields) {            field.setAccessible(true);            String name = field.getName(); // 获取属性的名字            Object value = getAttributeValue(t, name);// 获取属性值            map.put(name, value != null ? value : null);            name = null;            value = null;        }        result = map.toString();        fields = null;        map.clear();        map = null;        return result;    }    /**     * 返回JavaBena的toString方法值（只有属性的情况下）     *      * @param t     * @return String     */    public static 
        
          String getToString1(T t) {        String result = null;        Field[] fields = t.getClass().getDeclaredFields(); // 获取实体类的所有属性，返回Field数组        LinkedHashMap
         
           map = new LinkedHashMap
          
           (); for (Field field : fields) { try { field.setAccessible(true); map.put(field.getName(), field.get(t)); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } result = map.toString(); fields = null; map.clear(); map = null; return result; } /** * 通过反射，用属性名称获得属性值 * * @param t * @param attributeName * @return Object */ private static 
           
             Object getAttributeValue(T t, String attributeName) { Object result = null; Method method = null; try { StringBuffer methodName = new StringBuffer(GET); methodName.append(attributeName.substring(0, 1).toUpperCase()); methodName.append(attributeName.substring(1)); method = t.getClass().getMethod(methodName.toString()); methodName = null; result = method.invoke(t); method = null; } catch (NoSuchMethodException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvocationTargetException e) { // TODO Auto-generated catch block e.printStackTrace(); } return result; }}