这篇文章主要介绍了java基于反射得到对象属性值的方法,结合实例形式分析了java基于反射获取对象属性值的相关实现方法与操作技巧,需要的朋友可以参考下
本文实例讲述了java基于反射得到对象属性值的方法。分享给大家供大家参考，具体如下：
通过反射机制得到对象中的属性和属性值 在对象中private没问题，在别的类中有时会报异常。下面的例子是在本对象中
/**
* engine entity. @author myeclipse persistence tools
*/
public class engine implements java.io.serializable {
// fields
private long engineid;
private string enginename;
private string enginetype;
// constructors
/** default constructor */
public engine() {
}
/** minimal constructor */
public engine(long engineid) {
this.engineid = engineid;
}
public engine(string enginename, string enginetype) {
this.enginename = enginename;
this.enginetype = enginetype;
}
/** full constructor */
public engine(long engineid, string enginename, string enginetype) {
this.engineid = engineid;
this.enginename = enginename;
this.enginetype = enginetype;
}
// property accessors
public long getengineid() {
return this.engineid;
}
public void setengineid(long engineid) {
this.engineid = engineid;
}
public string getenginename() {
return this.enginename;
}
public void setenginename(string enginename) {
this.enginename = enginename;
}
public string getenginetype() {
return this.enginetype;
}
public void setenginetype(string enginetype) {
this.enginetype = enginetype;
}
public static void main(string[] args) throws exception {
engine m = new engine("汽车","发动机");
class clazz = m.getclass();
field[] f = clazz.getdeclaredfields();
string[] name = field2name(f);
object[] value = field2value(f, m);
shownameandvalue(name, value);
}
public static void shownameandvalue(string[] name, object[] value) {
for (int i = 0; i < name.length; i++) {
system.out.println("--" + i + "--");
system.out.println("name:" + name[i]);
system.out.println("value:" + value[i]);
system.out.println("-- --");
}
}
public static string[] field2name(field[] f) {
string[] name = new string[f.length];
for (int i = 0; i < f.length; i++) {
name[i] = f[i].getname();
}
return name;
}
public static object[] field2value(field[] f, object o) throws exception {
object[] value = new object[f.length];
for (int i = 0; i < f.length; i++) {
value[i] = f[i].get(o);
}
return value;
}
}
如果想调用private的属性的属性值，则要调用他的get方法了具体做法是：
把field2value方法改为如下方式，这样在别的类中也可以得到private的属性值了
public static object[] field2value(field[] fields, object o) throws exception {
object[] values = new object[fields.length];
class classtype = o.getclass();
for (int i = 0; i < fields.length; i++) {
string fieldname = fields[i].getname();
string firstletter = fieldname.substring(0, 1).touppercase();
string getmethodname = "get" + firstletter + fieldname.substring(1);
method getmethod = classtype.getmethod(getmethodname, new class[] {});
values[i] = getmethod.invoke(o, new object[] {});
}
return values;
}
以上就是java基于反射得到对象属性值的示例代码分享的详细内容。