利用java反射来实现输出对象的所有属性值

利用java反射来实现输出对象的所有属性值

1.覆盖toString方法。

2.在toString方法里面调用获取属性值的get方法。

见源码：

package org.lgzh.core.Action;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

public class BaseBean{

/**

*

*/

private static final long serialVersionUID = 1L;

public String toString(){

String s = "";

try {

s = getPropertyString(this);

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return s;

}

public String getPropertyString(Object entityName) throws Exception {

Class c = entityName.getClass();

Field field [] = c.getDeclaredFields();

StringBuffer sb = new StringBuffer();

sb.append("------ " + " begin ------\n");

for(Field f : field){

sb.append(f.getName());

sb.append(" : ");

sb.append(invokeMethod(entityName,f.getName(),null));

sb.append("\n");

}

sb.append("------ " + " end ------\n");

return sb.toString();

}

public Object invokeMethod(Object owner, String methodName, Object[] args) throws Exception{

Class ownerClass = owner.getClass();

methodName = methodName.substring(0, 1).toUpperCase() + methodName.substring(1);

Method method = null;

try {

method = ownerClass.getMethod("get" + methodName);

} catch (SecurityException e) {

// TODO Auto-generated catch block

//e.printStackTrace();

} catch (NoSuchMethodException e) {

// TODO Auto-generated catch block

//e.printStackTrace();

return " can't find 'get" + methodName + "' method";

}

return method.invoke(owner);

}

}

使用方法：

建一bean类继承BaseBean

public class UserVO extends BaseBean implements java.io.Serializable {

// Fields

/**

*

*/

private static final long serialVersionUID = 1L;

private Integer id;

private String username;

private String password;

private Date regDate;

private Integer visitTimes;

private Date lastVisit;

private Integer status;

// Constructors

/** default constructor */

public UserVO() {

}

/** minimal constructor */

public UserVO(Integer id) {

this.id = id;

}

/** full constructor */

public UserVO(Integer id, String username, String password, Date regDate, Integer visitTimes, Date lastVisit, Integer status) {

this.id = id;

this.username = username;

this.password = password;

this.regDate = regDate;

this.visitTimes = visitTimes;

this.lastVisit = lastVisit;

this.status = status;

}

// Property accessors

public Integer getId() {

return this.id;

}

public void setId(Integer id) {

this.id = id;

}

public String getUsername() {

return this.username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return this.password;

}

public void setPassword(String password) {

this.password = password;

}

public Date getRegDate() {

return this.regDate;

}

public void setRegDate(Date regDate) {

this.regDate = regDate;

}

public Integer getVisitTimes() {

return this.visitTimes;

}

public void setVisitTimes(Integer visitTimes) {

this.visitTimes = visitTimes;

}

public Date getLastVisit() {

return this.lastVisit;

}

public void setLastVisit(Date lastVisit) {

this.lastVisit = lastVisit;

}

public Integer getStatus() {

return this.status;

}

public void setStatus(Integer status) {

this.status = status;

}

}

执行语句：

UserVO userVO = new UserVO();

userVO.setId(1);

userVO.setStatus(0);

System.out.println(userVO);

用System.out.println(userVO);打印对象即可输出里面对象值