{"id":10006909,"date":"2022-11-24T13:04:10","date_gmt":"2022-11-24T05:04:10","guid":{"rendered":"https:\/\/ityet.com\/?p=10006909"},"modified":"2022-11-24T13:04:10","modified_gmt":"2022-11-24T05:04:10","slug":"java%e5%af%b9%e8%b1%a1%e6%8b%b7%e8%b4%9d%e5%8e%9f%e7%90%86%e5%89%96%e6%9e%90%e5%8f%8a%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006909","title":{"rendered":"Java\u5bf9\u8c61\u62f7\u8d1d\u539f\u7406\u5256\u6790\u53ca\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"<p>\u4f5c\u8005\uff1a\u5b81\u6d77\u7fd4<\/p>\n<h3>1 \u524d\u8a00<\/h3>\n<p>\u5bf9\u8c61\u62f7\u8d1d\uff0c\u662f\u6211\u4eec\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u7ed5\u4e0d\u5f00\u7684\u8fc7\u7a0b\uff0c\u65e2\u5b58\u5728\u4e8ePo\u3001Dto\u3001Do\u3001Vo\u5404\u4e2a\u8868\u73b0\u5c42\u6570\u636e\u7684\u8f6c\u6362\uff0c\u4e5f\u5b58\u5728\u4e8e\u7cfb\u7edf\u4ea4\u4e92\u5982\u5e8f\u5217\u5316\u3001\u53cd\u5e8f\u5217\u5316\u3002<\/p>\n<p>Java\u5bf9\u8c61\u62f7\u8d1d\u5206\u4e3a\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\uff0c\u76ee\u524d\u5e38\u7528\u7684\u5c5e\u6027\u62f7\u8d1d\u5de5\u5177\uff0c\u5305\u62ecApache\u7684BeanUtils\u3001Spring\u7684BeanUtils\u3001Cglib\u7684BeanCopier\u3001mapstruct\u90fd\u662f\u6d45\u62f7\u8d1d\u3002<\/p>\n<h4>1.1 \u6df1\u62f7\u8d1d<\/h4>\n<p>\u6df1\u62f7\u8d1d\uff1a\u5bf9\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u503c\u4f20\u9012\uff0c\u5bf9\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u5e76\u590d\u5236\u5176\u5185\u5bb9\u79f0\u4e3a\u6df1\u62f7\u8d1d\u3002<\/p>\n<p>\u6df1\u62f7\u8d1d\u5e38\u89c1\u6709\u4ee5\u4e0b\u56db\u79cd\u5b9e\u73b0\u65b9\u5f0f:<\/p>\n<ul>\n<li>\u6784\u9020\u51fd\u6570<\/li>\n<li>Serializable\u5e8f\u5217\u5316<\/li>\n<li>\u5b9e\u73b0Cloneable\u63a5\u53e3<\/li>\n<li>JSON\u5e8f\u5217\u5316<\/li>\n<\/ul>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042883304\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h4>1.2 \u6d45\u62f7\u8d1d<\/h4>\n<p>\u6d45\u62f7\u8d1d\uff1a\u5bf9\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u503c\u4f20\u9012\uff0c\u5bf9\u5f15\u7528\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u5f15\u7528\u4f20\u9012\u822c\u7684\u62f7\u8d1d\u79f0\u4e3a\u6d45\u62f7\u8d1d\u3002\u901a\u8fc7\u5b9e\u73b0Cloneabe\u63a5\u53e3\u5e76\u91cd\u5199Object\u7c7b\u4e2d\u7684clone()\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u6d45\u514b\u9686\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042883305\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h3>2 \u5e38\u7528\u5bf9\u8c61\u62f7\u8d1d\u5de5\u5177\u539f\u7406\u5256\u6790\u53ca\u6027\u80fd\u5bf9\u6bd4<\/h3>\n<p>\u76ee\u524d\u5e38\u7528\u7684\u5c5e\u6027\u62f7\u8d1d\u5de5\u5177\uff0c\u5305\u62ecApache\u7684BeanUtils\u3001Spring\u7684BeanUtils\u3001Cglib\u7684BeanCopier\u3001mapstruct\u3002<\/p>\n<ul>\n<li>Apache BeanUtils:BeanUtils\u662fApache commons\u7ec4\u4ef6\u91cc\u9762\u7684\u6210\u5458\uff0c\u7531Apache\u63d0\u4f9b\u7684\u4e00\u5957\u5f00\u6e90 api\uff0c\u7528\u4e8e\u7b80\u5316\u5bf9javaBean\u7684\u64cd\u4f5c\uff0c\u80fd\u591f\u5bf9\u57fa\u672c\u7c7b\u578b\u81ea\u52a8\u8f6c\u6362\u3002<\/li>\n<li>Spring BeanUtils\uff1aBeanUtils\u662fspring\u6846\u67b6\u4e0b\u81ea\u5e26\u7684\u5de5\u5177\uff0c\u5728org.springframework.beans\u5305\u4e0b\uff0c spring\u9879\u76ee\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002<\/li>\n<li>Cglib BeanCopier\uff1acglib\uff08Code Generation Library\uff09\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u3001\u9ad8\u6027\u80fd\u3001\u9ad8\u8d28\u91cf\u7684\u4ee3\u7801\u751f\u6210\u7c7b\u5e93\uff0cBeanCopier\u4f9d\u6258\u4e8ecglib\u7684\u5b57\u8282\u7801\u589e\u5f3a\u80fd\u529b\uff0c\u52a8\u6001\u751f\u6210\u5b9e\u73b0\u7c7b\uff0c\u5b8c\u6210\u5bf9\u8c61\u7684\u62f7\u8d1d\u3002<\/li>\n<li>mapstruct\uff1amapstruct \u662f\u4e00\u4e2a Java\u6ce8\u91ca\u5904\u7406\u5668\uff0c\u7528\u4e8e\u751f\u6210\u7c7b\u578b\u5b89\u5168\u7684 bean \u6620\u5c04\u7c7b\uff0c\u5728\u6784\u5efa\u65f6\uff0c\u6839\u636e\u6ce8\u89e3\u751f\u6210\u5b9e\u73b0\u7c7b\uff0c\u5b8c\u6210\u5bf9\u8c61\u62f7\u8d1d\u3002<\/li>\n<\/ul>\n<h4>2.1 \u539f\u7406\u5206\u6790<\/h4>\n<p>2.1.1 Apache BeanUtils<\/p>\n<p>\u4f7f\u7528\u65b9\u5f0f\uff1aBeanUtils.copyProperties(target, source);  <br \/>BeanUtils.copyProperties \u5bf9\u8c61\u62f7\u8d1d\u7684\u6838\u5fc3\u4ee3\u7801\u5982\u4e0b:<\/p>\n<pre><code>\n\/\/ 1.\u83b7\u53d6\u6e90\u5bf9\u8c61\u7684\u5c5e\u6027\u63cf\u8ff0\nPropertyDescriptor[] origDescriptors = this.getPropertyUtils().getPropertyDescriptors(orig);\nPropertyDescriptor[] temp = origDescriptors;\nint length = origDescriptors.length;\nString name;\nObject value;\n\n\/\/ 2.\u5faa\u73af\u83b7\u53d6\u6e90\u5bf9\u8c61\u6bcf\u4e2a\u5c5e\u6027\uff0c\u8bbe\u7f6e\u76ee\u6807\u5bf9\u8c61\u5c5e\u6027\u503c\nfor(int i = 0; i &lt; length; ++i) {\nPropertyDescriptor origDescriptor = temp[i];\nname = origDescriptor.getName();\n\/\/ 3.\u6821\u9a8c\u6e90\u5bf9\u8c61\u5b57\u6bb5\u53ef\u8bfb\u5207\u76ee\u6807\u5bf9\u8c61\u8be5\u5b57\u6bb5\u53ef\u5199\nif (!&quot;class&quot;.equals(name) &amp;&amp; this.getPropertyUtils().isReadable(orig, name) &amp;&amp; this.getPropertyUtils().isWriteable(dest, name)) {\ntry {\n\/\/ 4.\u83b7\u53d6\u6e90\u5bf9\u8c61\u5b57\u6bb5\u503c\nvalue = this.getPropertyUtils().getSimpleProperty(orig, name);\n\/\/ 5.\u62f7\u8d1d\u5c5e\u6027\nthis.copyProperty(dest, name, value);\n} catch (NoSuchMethodException var10) {\n}\n}\n}<\/code><\/pre>\n<p>\u5faa\u73af\u904d\u5386\u6e90\u5bf9\u8c61\u7684\u6bcf\u4e2a\u5c5e\u6027\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u5c5e\u6027\uff0c\u62f7\u8d1d\u6d41\u7a0b\u4e3a:<\/p>\n<ul>\n<li>\u6821\u9a8c\u6765\u6e90\u7c7b\u7684\u5b57\u6bb5\u662f\u5426\u53ef\u8bfbisReadable<\/li>\n<li>\u6821\u9a8c\u76ee\u6807\u7c7b\u7684\u5b57\u6bb5\u662f\u5426\u53ef\u5199isWriteable<\/li>\n<li>\u83b7\u53d6\u6765\u6e90\u7c7b\u7684\u5b57\u6bb5\u5c5e\u6027\u503cgetSimpleProperty<\/li>\n<li>\u83b7\u53d6\u76ee\u6807\u7c7b\u5b57\u6bb5\u7684\u7c7b\u578btype\uff0c\u5e76\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362<\/li>\n<li>\u8bbe\u7f6e\u76ee\u6807\u7c7b\u5b57\u6bb5\u7684\u503c<\/li>\n<\/ul>\n<p>\u7531\u4e8e\u5355\u5b57\u6bb5\u62f7\u8d1d\u65f6\u6bcf\u4e2a\u9636\u6bb5\u90fd\u4f1a\u8c03\u7528PropertyUtilsBean.getPropertyDescriptor\u83b7\u53d6\u5c5e\u6027\u914d\u7f6e,\u800c\u8be5\u65b9\u6cd5\u901a\u8fc7for\u5faa\u73af\u83b7\u53d6\u7c7b\u7684\u5b57\u6bb5\u5c5e\u6027\uff0c\u4e25\u91cd\u5f71\u54cd\u62f7\u8d1d\u6548\u7387\u3002  <br \/>\u83b7\u53d6\u5b57\u6bb5\u5c5e\u6027\u914d\u7f6e\u7684\u6838\u5fc3\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>PropertyDescriptor[] descriptors = this.getPropertyDescriptors(bean);\nif (descriptors != null) {\nfor (int i = 0; i &lt; descriptors.length; ++i) {\nif (name.equals(descriptors[i].getName())) {\nreturn descriptors[i];\n}\n}\n}<\/code><\/pre>\n<h4>2.1.2 Spring BeanUtils<\/h4>\n<p>\u4f7f\u7528\u65b9\u5f0f: BeanUtils.copyProperties(source, target);  <br \/>BeanUtils.copyProperties\u6838\u5fc3\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);\nList&lt;String&gt; ignoreList = ignoreProperties != null ? Arrays.asList(ignoreProperties) : null;\nPropertyDescriptor[] arr$ = targetPds;\nint len$ = targetPds.length;\nfor(int i$ = 0; i$ &lt; len$; ++i$) {\nPropertyDescriptor targetPd = arr$[i$];\nMethod writeMethod = targetPd.getWriteMethod();\nif (writeMethod != null &amp;&amp; (ignoreList == null || !ignoreList.contains(targetPd.getName()))) {\nPropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());\nif (sourcePd != null) {\nMethod readMethod = sourcePd.getReadMethod();\nif (readMethod != null &amp;&amp; ClassUtils.isAssignable(writeMethod.getParameterTypes()[0], readMethod.getReturnType())) {\ntry {\nif (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {\nreadMethod.setAccessible(true);\n}\nObject value = readMethod.invoke(source);\nif (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {\nwriteMethod.setAccessible(true);\n}\nwriteMethod.invoke(target, value);\n} catch (Throwable var15) {\nthrow new FatalBeanException(&quot;Could not copy property '&quot; + targetPd.getName() + &quot;' from source to target&quot;, var15);\n}\n}\n}\n}\n}<\/code><\/pre>\n<p>\u62f7\u8d1d\u6d41\u7a0b\u7b80\u8981\u63cf\u8ff0\u5982\u4e0b:<\/p>\n<ul>\n<li>\u83b7\u53d6\u76ee\u6807\u7c7b\u7684\u6240\u6709\u5c5e\u6027\u63cf\u8ff0<\/li>\n<li>\u5faa\u73af\u76ee\u6807\u7c7b\u7684\u5c5e\u6027\u503c\u505a\u4ee5\u4e0b\u64cd\u4f5c<\/li>\n<li>\n<ul>\n<li>\u83b7\u53d6\u76ee\u6807\u7c7b\u7684\u5199\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\u83b7\u53d6\u6765\u6e90\u7c7b\u7684\u8be5\u5c5e\u6027\u7684\u5c5e\u6027\u63cf\u8ff0(\u7f13\u5b58\u83b7\u53d6)<\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\u83b7\u53d6\u6765\u6e90\u7c7b\u7684\u8bfb\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\u8bfb\u6765\u6e90\u5c5e\u6027\u503c<\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\u5199\u76ee\u6807\u5c5e\u6027\u503c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e0eApache BeanUtils\u7684\u5c5e\u6027\u62f7\u8d1d\u76f8\u6bd4\uff0cSpring\u901a\u8fc7Map\u7f13\u5b58\uff0c\u907f\u514d\u4e86\u7c7b\u7684\u5c5e\u6027\u63cf\u8ff0\u91cd\u590d\u83b7\u53d6\u52a0\u8f7d\uff0c\u901a\u8fc7\u61d2\u52a0\u8f7d\uff0c\u521d\u6b21\u62f7\u8d1d\u65f6\u52a0\u8f7d\u6240\u6709\u5c5e\u6027\u63cf\u8ff0\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042883306\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>2.1.3 Cglib BeanCopier<\/p>\n<p>\u4f7f\u7528\u65b9\u5f0f\uff1a<\/p>\n<pre><code>BeanCopier beanCopier = BeanCopier.create(AirDepartTask.class, AirDepartTaskDto.class, false);\nbeanCopier.copy(airDepartTask, airDepartTaskDto, null);<\/code><\/pre>\n<p>create\u8c03\u7528\u94fe\u5982\u4e0b:<\/p>\n<p>BeanCopier.create  <br \/>-\/&gt; BeanCopier.Generator.create  <br \/>-\/&gt; AbstractClassGenerator.create  <br \/>-&gt;DefaultGeneratorStrategy.generate  <br \/>-\/&gt; BeanCopier.Generator.generateClass<\/p>\n<p>BeanCopier \u901a\u8fc7cglib\u52a8\u6001\u4ee3\u7406\u64cd\u4f5c\u5b57\u8282\u7801\uff0c\u751f\u6210\u4e00\u4e2a\u590d\u5236\u7c7b\uff0c\u89e6\u53d1\u70b9\u4e3aBeanCopier.create<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042883307\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>2.1.4 mapstruct<\/p>\n<p>\u4f7f\u7528\u65b9\u5f0f:<\/p>\n<ul>\n<li>\u5f15\u5165pom\u4f9d\u8d56<\/li>\n<li>\u58f0\u660e\u8f6c\u6362\u63a5\u53e3<\/li>\n<\/ul>\n<p>mapstruct\u57fa\u4e8e\u6ce8\u89e3\uff0c\u6784\u5efa\u65f6\u81ea\u52a8\u751f\u6210\u5b9e\u73b0\u7c7b\uff0c\u8c03\u7528\u94fe\u5982\u4e0b:  <br \/>MappingProcessor.process -&gt; MappingProcessor.processMapperElements  <br \/>MapperCreationProcessor.process:\u751f\u6210\u5b9e\u73b0\u7c7bMapper  <br \/>MapperRenderingProcessor:\u5c06\u5b9e\u73b0\u7c7bmapper\uff0c\u5199\u5165\u6587\u4ef6\uff0c\u751f\u6210impl\u6587\u4ef6  <br \/>\u4f7f\u7528\u65f6\u9700\u8981\u58f0\u660e\u8f6c\u6362\u63a5\u53e3\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>@Mapper(nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)\npublic interface AirDepartTaskConvert {\nAirDepartTaskConvert INSTANCE = getMapper(AirDepartTaskConvert.class);\nAirDepartTaskDto convertToDto(AirDepartTask airDepartTask);\n}<\/code><\/pre>\n<p>\u751f\u6210\u7684\u5b9e\u73b0\u7c7b\u5982\u4e0b\uff1a<\/p>\n<pre><code>public class AirDepartTaskConvertImpl implements AirDepartTaskConvert {\n\n@Override\npublic AirDepartTaskDto convertToDto(AirDepartTask airDepartTask) {\nif ( airDepartTask == null ) {\nreturn null;\n}\n\nAirDepartTaskDto airDepartTaskDto = new AirDepartTaskDto();\n\nairDepartTaskDto.setId( airDepartTask.getId() );\nairDepartTaskDto.setTaskId( airDepartTask.getTaskId() );\nairDepartTaskDto.setPreTaskId( airDepartTask.getPreTaskId() );\nList&lt;String&gt; list = airDepartTask.getTaskBeginNodeCodes();\nif ( list != null ) {\nairDepartTaskDto.setTaskBeginNodeCodes( new ArrayList&lt;String&gt;( list ) );\n}\n\/\/ \u5176\u4ed6\u5c5e\u6027\u62f7\u8d1d\nairDepartTaskDto.setYn( airDepartTask.getYn() );\n\nreturn airDepartTaskDto;\n}\n}<\/code><\/pre>\n<h4>2.2 \u6027\u80fd\u5bf9\u6bd4<\/h4>\n<p>\u4ee5\u822a\u7a7a\u4e1a\u52a1\u7cfb\u7edf\u4e2d\u53d1\u8d27\u4efb\u52a1po\u5230dto\u8f6c\u6362\u4e3a\u4f8b\uff0c\u968f\u7740\u62f7\u8d1d\u6570\u636e\u91cf\u7684\u589e\u5927\uff0c\u7814\u7a76\u62f7\u8d1d\u6570\u636e\u8017\u65f6\u60c5\u51b5<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042883308\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h4>2.3 \u62f7\u8d1d\u9009\u578b<\/h4>\n<p>\u7ecf\u8fc7\u4ee5\u4e0a\u5206\u6790\uff0c\u968f\u7740\u6570\u636e\u91cf\u7684\u589e\u5927\uff0c\u8017\u65f6\u6574\u4f53\u5448\u4e0a\u5347\u8d8b\u52bf<\/p>\n<ul>\n<li>\u6574\u4f53\u60c5\u51b5\u4e0b\uff0cApache BeanUtils\u7684\u6027\u80fd\u6700\u5dee\uff0c\u65e5\u5e38\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u4e0d\u5efa\u8bae\u4f7f\u7528<\/li>\n<li>\u5728\u6570\u636e\u89c4\u6a21\u4e0d\u5927\u7684\u60c5\u51b5\u4e0b\uff0cspring\u3001cglib\u3001mapstruct\u5dee\u5f02\u4e0d\u5927\uff0cspring\u6846\u67b6\u4e0b\u5efa\u8bae\u4f7f\u7528spring\u7684beanUtils\uff0c\u4e0d\u9700\u8981\u989d\u5916\u5f15\u5165\u4f9d\u8d56\u5305<\/li>\n<li>\u6570\u636e\u91cf\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u5efa\u8bae\u4f7f\u7528cglib\u548cmapstruct<\/li>\n<li>\u6d89\u53ca\u5927\u91cf\u6570\u636e\u8f6c\u6362\uff0c\u5c5e\u6027\u6620\u5c04\uff0c\u683c\u5f0f\u8f6c\u6362\u7684\uff0c\u5efa\u8bae\u4f7f\u7528mapstruct<\/li>\n<\/ul>\n<h3>3 \u6700\u4f73\u5b9e\u8df5<\/h3>\n<h4>3.1 BeanCopier<\/h4>\n<p>\u4f7f\u7528\u65f6\u53ef\u4ee5\u4f7f\u7528map\u7f13\u5b58\uff0c\u51cf\u5c11\u540c\u4e00\u7c7b\u5bf9\u8c61\u8f6c\u6362\u65f6\uff0ccreate\u6b21\u6570<\/p>\n<pre><code>\/**\n* BeanCopier\u7684\u7f13\u5b58\uff0c\u907f\u514d\u9891\u7e41\u521b\u5efa\uff0c\u9ad8\u6548\u590d\u7528\n*\/\nprivate static final ConcurrentHashMap&lt;String, BeanCopier&gt; BEAN_COPIER_MAP_CACHE = new ConcurrentHashMap&lt;String, BeanCopier&gt;();\n\n\/**\n* BeanCopier\u7684copyBean\uff0c\u9ad8\u6027\u80fd\u63a8\u8350\u4f7f\u7528\uff0c\u589e\u52a0\u7f13\u5b58\n*\n* @param source \u6e90\u6587\u4ef6\u7684\n* @param target \u76ee\u6807\u6587\u4ef6\n*\/\npublic static void copyBean(Object source, Object target) {\nString key = genKey(source.getClass(), target.getClass());\nBeanCopier beanCopier;\nif (BEAN_COPIER_MAP_CACHE.containsKey(key)) {\nbeanCopier = BEAN_COPIER_MAP_CACHE.get(key);\n} else {\nbeanCopier = BeanCopier.create(source.getClass(), target.getClass(), false);\nBEAN_COPIER_MAP_CACHE.put(key, beanCopier);\n}\nbeanCopier.copy(source, target, null);\n}\n\n\/**\n* \u4e0d\u540c\u7c7b\u578b\u5bf9\u8c61\u6570\u636ecopylist\n*\n* @param sourceList\n* @param targetClass\n* @param &lt;T&gt;\n* @return\n*\/\npublic static &lt;T&gt; List&lt;T&gt; copyListProperties(List&lt;?&gt; sourceList, Class&lt;T&gt; targetClass) throws Exception {\nif (CollectionUtils.isNotEmpty(sourceList)) {\nList&lt;T&gt; list = new ArrayList&lt;T&gt;(sourceList.size());\nfor (Object source : sourceList) {\nT target = copyProperties(source, targetClass);\nlist.add(target);\n}\nreturn list;\n}\nreturn Lists.newArrayList();\n}\n\n\/**\n* \u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u5bf9\u8c61\u6570\u636ecopy,\u4f7f\u7528\u6b64\u65b9\u6cd5\u9700\u6ce8\u610f\u4e0d\u80fd\u8986\u76d6\u9ed8\u8ba4\u7684\u65e0\u53c2\u6784\u9020\u65b9\u6cd5\n*\n* @param source\n* @param targetClass\n* @param &lt;T&gt;\n* @return\n*\/\npublic static &lt;T&gt; T copyProperties(Object source, Class&lt;T&gt; targetClass) throws Exception {\nT target = targetClass.newInstance();\ncopyBean(source, target);\nreturn target;\n}\n\n\/**\n* @param srcClazz \u6e90class\n* @param tgtClazz \u76ee\u6807class\n* @return string\n*\/\nprivate static String genKey(Class&lt;?&gt; srcClazz, Class&lt;?&gt; tgtClazz) {\nreturn srcClazz.getName() + tgtClazz.getName();\n}<\/code><\/pre>\n<h4>3.2 mapstruct<\/h4>\n<p>mapstruct\u652f\u6301\u591a\u79cd\u5f62\u5f0f\u5bf9\u8c61\u7684\u6620\u5c04\uff0c\u4e3b\u8981\u6709\u4e0b\u9762\u51e0\u79cd<\/p>\n<ul>\n<li>\u57fa\u672c\u6620\u5c04<\/li>\n<li>\u6620\u5c04\u8868\u8fbe\u5f0f<\/li>\n<li>\u591a\u4e2a\u5bf9\u8c61\u6620\u5c04\u5230\u4e00\u4e2a\u5bf9\u8c61<\/li>\n<li>\u6620\u5c04\u96c6\u5408<\/li>\n<li>\u6620\u5c04map<\/li>\n<li>\u6620\u5c04\u679a\u4e3e<\/li>\n<li>\u5d4c\u5957\u6620\u5c04<\/li>\n<\/ul>\n<pre><code>@Mapper(nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)\npublic interface AirDepartTaskConvert {\nAirDepartTaskConvert INSTANCE = getMapper(AirDepartTaskConvert.class);\n\n\/\/ a.\u57fa\u672c\u6620\u5c04\n@Mapping(target = &quot;createTime&quot;, source = &quot;updateTime&quot;)\n\/\/ b.\u6620\u5c04\u8868\u8fbe\u5f0f\n@Mapping(target = &quot;updateTimeStr&quot;, expression = &quot;java(new SimpleDateFormat( \/&quot;yyyy-MM-dd\/&quot; ).format(airDepartTask.getCreateTime()))&quot;)\nAirDepartTaskDto convertToDto(AirDepartTask airDepartTask);\n}\n\n@Mapper\npublic interface AddressMapper {\nAddressMapper INSTANCE = Mappers.getMapper(AddressMapper.class);\n\n\/\/ c.\u591a\u4e2a\u5bf9\u8c61\u6620\u5c04\u5230\u4e00\u4e2a\u5bf9\u8c61\n@Mapping(source = &quot;person.description&quot;, target = &quot;description&quot;)\n@Mapping(source = &quot;address.houseNo&quot;, target = &quot;houseNumber&quot;)\nDeliveryAddressDto personAndAddressToDeliveryAddressDto(Person person, Address address);\n}\n\n@Mapper\npublic interface CarMapper {\n\/\/ d.\u6620\u5c04\u96c6\u5408\nSet&lt;String&gt; integerSetToStringSet(Set&lt;Integer&gt; integers);\n\nList&lt;CarDto&gt; carsToCarDtos(List&lt;Car&gt; cars);\n\nCarDto carToCarDto(Car car);\n\/\/ e.\u6620\u5c04map\n@MapMapping(valueDateFormat = &quot;dd.MM.yyyy&quot;)\nMap&lt;String,String&gt; longDateMapToStringStringMap(Map&lt;Long, Date&gt; source);\n\n\/\/ f.\u6620\u5c04\u679a\u4e3e\n@ValueMappings({\n@ValueMapping(source = &quot;EXTRA&quot;, target = &quot;SPECIAL&quot;),\n@ValueMapping(source = &quot;STANDARD&quot;, target = &quot;DEFAULT&quot;),\n@ValueMapping(source = &quot;NORMAL&quot;, target = &quot;DEFAULT&quot;)\n})\nExternalOrderType orderTypeToExternalOrderType(OrderType orderType);\n\/\/ g.\u5d4c\u5957\u6620\u5c04\n@Mapping(target = &quot;fish.kind&quot;, source = &quot;fish.type&quot;)\n@Mapping(target = &quot;fish.name&quot;, ignore = true)\n@Mapping(target = &quot;ornament&quot;, source = &quot;interior.ornament&quot;)\n@Mapping(target = &quot;material.materialType&quot;, source = &quot;material&quot;)\n@Mapping(target = &quot;quality.report.organisation.name&quot;, source = &quot;quality.report.organisationName&quot;)\nFishTankDto map( FishTank source );\n}<\/code><\/pre>\n<h3>4 \u603b\u7ed3<\/h3>\n<p>\u4ee5\u4e0a\u5c31\u662f\u6211\u5728\u4f7f\u7528\u5bf9\u8c61\u62f7\u8d1d\u8fc7\u7a0b\u4e2d\u7684\u4e00\u70b9\u6d45\u8c08\u3002\u5728\u65e5\u5e38\u7cfb\u7edf\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u8981\u6df1\u7a76\u5e95\u5c42\u903b\u8f91\uff0c\u54ea\u6015\u53d1\u73b0\u4e00\u5c0f\u70b9\u7684\u6539\u53d8\u80fd\u591f\u4f7f\u6211\u4eec\u7684\u7cfb\u7edf\u66f4\u52a0\u7a33\u5b9a\u3001\u987a\u7545\uff0c\u90fd\u662f\u503c\u5f97\u6211\u4eec\u53bb\u6539\u8fdb\u7684\u3002<\/p>\n<p>\u6700\u540e\uff0c\u5e0c\u671b\u968f\u7740\u6211\u4eec\u7684\u52a0\u5165\uff0c\u7cfb\u7edf\u4f1a\u66f4\u52a0\u7a33\u5b9a\u3001\u987a\u7545\uff0c\u6211\u4eec\u4f1a\u53d8\u5f97\u8d8a\u6765\u8d8a\u4f18\u79c0\u3002<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042883302\">https:\/\/segmentfault.com\/a\/1190000042883302<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f5c\u8005\uff1a\u5b81\u6d77\u7fd4 1 \u524d\u8a00 \u5bf9\u8c61\u62f7\u8d1d\uff0c\u662f\u6211\u4eec\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u7ed5\u4e0d\u5f00\u7684\u8fc7\u7a0b\uff0c\u65e2\u5b58\u5728\u4e8ePo\u3001Dto\u3001Do\u3001Vo\u5404\u4e2a\u8868\u73b0\u5c42 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10006909","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006909","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006909"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006909\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006909"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}