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先说一下需求:最近做一个项目其中需要将前台传来的数组存到数据库,但是这个表里有15个字段,集合是不固定的,然后要把这个集合的数值赋给这个类的相应属性,然后存到数据库中。集合长度应小于等于这个类属性的个数。下面是代码
实体类
package com.test.flect;
public class TbFilterLevel {
private Long id;
private Long itemId;
private String value1;
private String value2;
private String value3;
private String value4;
private String value5;
private String value6;
private String value7;
private String value8;
private String value9;
private String value10;
private String value11;
private String value12;
private String value13;
private String value14;
private String value15;
public Long getId() {
return id;
public void setId(Long id) {
this.id = id;
public Long getItemId() {
return itemId;
public void setItemId(Long itemId) {
this.itemId = itemId;
public String getValue1() {
return value1;
public void setValue1(String value1) {
this.value1 = value1 == null ? null : value1.trim();
public String getValue2() {
return value2;
public void setValue2(String value2) {
this.value2 = value2 == null ? null : value2.trim();
public String getValue3() {
return value3;
public void setValue3(String value3) {
this.value3 = value3 == null ? null : value3.trim();
public String getValue4() {
return value4;
public void setValue4(String value4) {
this.value4 = value4 == null ? null : value4.trim();
public String getValue5() {
return value5;
public void setValue5(String value5) {
this.value5 = value5 == null ? null : value5.trim();
public String getValue6() {
return value6;
public void setValue6(String value6) {
this.value6 = value6 == null ? null : value6.trim();
public String getValue7() {
return value7;
public void setValue7(String value7) {
this.value7 = value7 == null ? null : value7.trim();
public String getValue8() {
return value8;
public void setValue8(String value8) {
this.value8 = value8 == null ? null : value8.trim();
public String getValue9() {
return value9;
public void setValue9(String value9) {
this.value9 = value9 == null ? null : value9.trim();
public String getValue10() {
return value10;
public void setValue10(String value10) {
this.value10 = value10 == null ? null : value10.trim();
public String getValue11() {
return value11;
public void setValue11(String value11) {
this.value11 = value11 == null ? null : value11.trim();
public String getValue12() {
return value12;
public void setValue12(String value12) {
this.value12 = value12 == null ? null : value12.trim();
public String getValue13() {
return value13;
public void setValue13(String value13) {
this.value13 = value13 == null ? null : value13.trim();
public void setValue14(String value14) {
this.value14 = value14 == null ? null : value14.trim();
public String getValue14() {
return value14;
public String getValue15() {
return value15;
public void setValue15(String value15) {
this.value15 = value15 == null ? null : value15.trim();
}
封装的方法:
private void testReflect(Object model,List<?> list) throws SecurityException,
NoSuchMethodException, IllegalArgumentException,
IllegalAccessException, InvocationTargetException, InstantiationException{
// 获取实体类的所有属性,返回Field数组
Field[] field = model.getClass().getDeclaredFields();
// 获取属性的名字
String[] modelName = new String[field.length];
String[] modelType = new String[field.length];
for (int i = 0; i < field.length; i++){
// 获取属性的名字
String name = field[i].getName();
modelName[i] = name;
// 获取属性类型
String type = field[i].getGenericType().toString();
modelType[i] = type;
//关键。。。可访问私有变量
field[i].setAccessible(true);
// 将属性的首字母大写
name = name.replaceFirst(name.substring(0, 1), name.substring(0, 1)
.toUpperCase());
if (type.equals("class java.lang.String")){ //我只需要String类型的赋值,所以只加了String类型的约束,其他的可以自己加,吧String换成别的类即可
// 如果type是类类型,则前面包含"class ",后面跟类名
Method m = model.getClass().getMethod("get" + name);
// 调用getter方法获取属性值
String value = (String) m.invoke(model);
String str=null;
if (value == null){
m = model.getClass().getMethod("set"+name,String.class);
if(list.size()>i-2&&list.size()<field.length-2){//我的String类型的属性是15个,所以这个集合长度这么约束的,这样不会有多余的值,其他长度请自己处理
m.invoke(model, list.get(i-2));
}else if(i-2==list.size()){
m = model.getClass().getMethod("set"+name,String.class);
m.invoke(model, str);
}else{
break;
}
如有疑问请联系我,我们一起讨论学习一下。