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正文
作为一个员工,最重要的不是编写代码,而是阅读代码,本博主在阅读代码的时候,发现几种实现两个不同类型的Bean的差异,本着研究的精神,仔细对比了Bean复制的性能差异。
比较的框架分别是Apache的BeanUtils,PropertyUtils,Spring的,BeanUtils,Cglib的BeanCopier。
做法是在idea新建了一个Project,专门用于专门测试几种代码的性能。具体的代码如下:一个FromBean和一个ToBean。
- public class FromBean {
- private String name;
- private int age;
- private String address;
- private String idno;
- private double money;
- public double getMoney() {
- return money;
- }
- public void setMoney(double money) {
- this.money = money;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public int getAge() {
- return age;
- }
- public void setAge(int age) {
- this.age = age;
- }
- public String getAddress() {
- return address;
- }
- public void setAddress(String address) {
- this.address = address;
- }
- public String getIdno() {
- return idno;
- }
- public void setIdno(String idno) {
- this.idno = idno;
- }
- }
一个用于测试的BenchmarkTest类
- public class BenchmarkTest {
- private int count;
- public BenchmarkTest(int count) {
- this.count = count;
- System.out.println("性能测试" + this.count + "==================");
- }
- public void benchmark(IMethodCallBack m, FromBean frombean) {
- try {
- long begin = new java.util.Date().getTime();
- ToBean tobean = null;
- System.out.println(m.getMethodName() + "开始进行测试");
- for (int i = 0; i < count; i++) {
- tobean = m.callMethod(frombean);
- }
- long end = new java.util.Date().getTime();
- System.out.println(m.getMethodName() + "耗时" + (end - begin));
- System.out.println(tobean.getAddress());
- System.out.println(tobean.getAge());
- System.out.println(tobean.getIdno());
- System.out.println(tobean.getMoney());
- System.out.println(tobean.getName());
- System.out.println(" ");
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
对接口的声明
- public interface IMethodCallBack {
- String getMethodName();
- ToBean callMethod(FromBean frombean) throws Exception;
- }
使用的测试类
- public class TestMain {
- /**
- * @param args
- */
- public static void main(String[] args) {
- FromBean fb = new FromBean();
- fb.setAddress("北京市朝阳区大屯路");
- fb.setAge(20);
- fb.setMoney(30000.111);
- fb.setIdno("110330219879208733");
- fb.setName("测试");
- IMethodCallBack beanutilCB = new IMethodCallBack() {
- @Override
- public String getMethodName() {
- return "BeanUtil.copyProperties";
- }
- @Override
- public ToBean callMethod(FromBean frombean) throws Exception {
- ToBean toBean = new ToBean();
- BeanUtils.copyProperties(toBean, frombean);
- return toBean;
- }
- };
- IMethodCallBack propertyCB = new IMethodCallBack() {
- @Override
- public String getMethodName() {
- return "PropertyUtils.copyProperties";
- }
- @Override
- public ToBean callMethod(FromBean frombean) throws Exception {
- ToBean toBean = new ToBean();
- PropertyUtils.copyProperties(toBean, frombean);
- return toBean;
- }
- };
- IMethodCallBack springCB = new IMethodCallBack() {
- @Override
- public String getMethodName() {
- return "org.springframework.beans.BeanUtils.copyProperties";
- }
- @Override
- public ToBean callMethod(FromBean frombean) throws Exception {
- ToBean toBean = new ToBean();
- org.springframework.beans.BeanUtils.copyProperties(frombean,
- toBean);
- return toBean;
- }
- };
- IMethodCallBack cglibCB = new IMethodCallBack() {
- BeanCopier bc = BeanCopier.create(FromBean.class, ToBean.class,
- false);
- @Override
- public String getMethodName() {
- return "BeanCopier.create";
- }
- @Override
- public ToBean callMethod(FromBean frombean) throws Exception {
- ToBean toBean = new ToBean();
- bc.copy(frombean, toBean, null);
- return toBean;
- }
- };
- // 数量较少的时候,测试性能
- BenchmarkTest bt = new BenchmarkTest(10);
- bt.benchmark(beanutilCB, fb);
- bt.benchmark(propertyCB, fb);
- bt.benchmark(springCB, fb);
- bt.benchmark(cglibCB, fb);
- // 测试一万次性能测试
- BenchmarkTest bt10000 = new BenchmarkTest(10000);
- bt10000.benchmark(beanutilCB, fb);
- bt10000.benchmark(propertyCB, fb);
- bt10000.benchmark(springCB, fb);
- bt10000.benchmark(cglibCB, fb);
- // 担心因为顺序问题影响测试结果
- BenchmarkTest bt1000R = new BenchmarkTest(10000);
- bt1000R.benchmark(cglibCB, fb);
- bt1000R.benchmark(springCB, fb);
- bt1000R.benchmark(propertyCB, fb);
- bt1000R.benchmark(beanutilCB, fb);
- }
- }
测试的结果如下
不过需要注意的是,Cglib在测试的时候,先进行了实例的缓存,这个也是他性能较好的原因之一。如果把缓存去掉的话,性能就会出现了一些的差异,但是整体的性能还是很好, 从整体的表现来看,Cglib的BeanCopier的性能是最好的无论是数量较大的1万次的测试,还是数量较少10次,几乎都是趋近与零损耗,Spring是在次数增多的情况下,性能较好,在数据较少的时候,性能比PropertyUtils的性能差一些。PropertyUtils的性能相对稳定,表现是呈现线性增长的趋势。而Apache的BeanUtil的性能最差,无论是单次Copy还是大数量的多次Copy性能都不是很好。