java基于反射得到對(duì)象屬性值的方法

更新時(shí)間：2017年03月27日 09:38:47 作者：ITshu

這篇文章主要介紹了java基于反射得到對(duì)象屬性值的方法,結(jié)合實(shí)例形式分析了java基于反射獲取對(duì)象屬性值的相關(guān)實(shí)現(xiàn)方法與操作技巧,需要的朋友可以參考下

本文實(shí)例講述了java基于反射得到對(duì)象屬性值的方法。分享給大家供大家參考，具體如下：

通過反射機(jī)制得到對(duì)象中的屬性和屬性值在對(duì)象中private沒問題，在別的類中有時(shí)會(huì)報(bào)異常。下面的例子是在本對(duì)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("汽車","發(fā)動(dòng)機(jī)");
 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;
 }
}

如果想調(diào)用private的屬性的屬性值，則要調(diào)用他的get方法了具體做法是：

把field2Value方法改為如下方式，這樣在別的類中也可以得到private的屬性值了

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;
}

更多java相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《java日期與時(shí)間操作技巧匯總》、《Java圖片操作技巧匯總》、《Java操作DOM節(jié)點(diǎn)技巧總結(jié)》、《Java文件與目錄操作技巧匯總》及《Java數(shù)據(jù)結(jié)構(gòu)與算法教程》。

希望本文所述對(duì)大家java程序設(shè)計(jì)有所幫助。

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