从Spring Boot 1.4 迁移到 2.0 时，一切顺利，直到我测试了分页功能。简而言之，我有一个Web MVC @RestController，其方法返回Page<MyDTO>。最初，响应将在JSON中序列化非常简单：
{
"content": {},
"last": true,
"totalElements": 18,
"totalPages": 1,
"sort": [
{
"direction": "ASC",
"property": "id",
"ignoreCase": false,
"nullHandling": "NATIVE",
"ascending": true
}
],
"numberOfElements": 18,
"first": true,
"size": 50,
"number": 0
}
但是在迁移之后，我会得到类似的东西：
{
"content": {},
"pageable": {
"sort": {
"sorted": false,
"unsorted": true
},
"offset": 0,
"pageNumber": 0,
"pageSize": 20,
"unpaged": false,
"paged": true
},
"totalPages": 1,
"totalElements": 1,
"last": true,
"size": 20,
"number": 0,
"sort": {
"sorted": false,
"unsorted": true
},
"first": true,
"numberOfElements": 1
}
我不会介意，除非反序列化不起作用，即使在尝试调整MappingJackson2HttpMessageConverter并设置一些抽象类型解析器之后也是如此。
官方的Spring文档在如何进行方面并不是很广泛，如果使用Repositories和@RestResource，它似乎处理得很好。但是，当通过MVC控制器公开API时，处理分页的正确和首选方法是什么？
编辑添加堆栈跟踪和更多上下文
在现有代码上运行RestTemplates客户端将导致以下堆栈跟踪。虽然这不是很重要，但我可以通过实现自定义Pageable子类（以及Sort）并配置MessageConverter来使用它们来解决这个问题。基本问题是如何使用最新的Spring Boot堆栈在JSON中序列化/反序列化Page实例？
ERROR b.o.c.a.handler.CrisExceptionHandler - Type definition error: [simple type, class org.springframework.data.domain.Pageable]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `org.springframework.data.domain.Pageable` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
at [Source: (PushbackInputStream); line: 1, column: 4802] (through reference chain: be.ondd.cris.service.integration.util.RestResponsePage["pageable"])
org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class org.springframework.data.domain.Pageable]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `org.springframework.data.domain.Pageable` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
at [Source: (PushbackInputStream); line: 1, column: 4802] (through reference chain: be.ondd.cris.service.integration.util.RestResponsePage["pageable"])
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:238)
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:223)
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:100)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:991)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:974)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:725)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:680)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:629)
at be.ondd.cris.service.integration.InformationProviderCRISService.searchInformationProvider(InformationProviderCRISService.java:85)
at be.ondd.cris.service.integration.InformationProviderCRISService$$FastClassBySpringCGLIB$$adc25943.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:746)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
at be.ondd.cris.api.aspect.LoggingHandler.logAround(LoggingHandler.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at be.ondd.cris.service.integration.InformationProviderCRISService$$EnhancerBySpringCGLIB$$51eda584.searchInformationProvider(<generated>)
at be.ondd.cris.service.ProductMapperService.mapPageProductToPageProductJson(ProductMapperService.java:126)
at be.ondd.cris.service.ProductMapperService$$FastClassBySpringCGLIB$$4257f2af.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:746)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
at be.ondd.cris.api.aspect.LoggingHandler.logAround(LoggingHandler.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at be.ondd.cris.service.ProductMapperService$$EnhancerBySpringCGLIB$$4f13b548.mapPageProductToPageProductJson(<generated>)
at be.ondd.cris.controller.ProductController.findByParameters(ProductController.java:112)
at be.ondd.cris.controller.ProductController$$FastClassBySpringCGLIB$$7aca546a.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:746)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:174)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
at be.ondd.cris.api.aspect.LoggingHandler.logAround(LoggingHandler.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
at be.ondd.cris.api.aspect.AuditBusinessActivityHandler.logAround(AuditBusinessActivityHandler.java:98)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:174)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at be.ondd.cris.controller.ProductController$$EnhancerBySpringCGLIB$$c7d33074.findByParameters(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:158)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:126)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:111)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:84)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at be.ondd.cris.api.http.CorrelationFilter.doFilter(CorrelationFilter.java:36)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:209)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `org.springframework.data.domain.Pageable` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
at [Source: (PushbackInputStream); line: 1, column: 4802] (through reference chain: be.ondd.cris.service.integration.util.RestResponsePage["pageable"])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1451)
at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1027)
at com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserialize(AbstractDeserializer.java:265)
at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:136)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:369)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4001)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3072)
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:235)
... 149 common frames omitted
答案 0 :(得分：1)
我最终在我的应用程序上下文中添加了一个Jackson模块：
@Bean
public SimpleModule pageJsonModule(Mapper mapper) {
return new PageJsonModule(mapper);
}
/**
* Simple Jackson module registering a serializer for the {@link Page} from spring data.
* Can be dropped if the controllers all return something else than this not JSON friendly type (e.g. HAL response)
* @see RestResponsePage
*/
private static class PageJsonModule extends SimpleModule {
final Mapper mapper;
PageJsonModule(Mapper mapper) {
super("spring.data.page.module");
this.mapper = mapper;
this.addSerializer(new JsonSerializer<Page>() {
/**
* will copy fields from the {@link Page} to the JSON friendly POJO {@link RestResponsePage}
* @param value a {@link Page} of any type
* @param gen see parent
* @param serializers see parent
* @throws IOException see parent
*/
@Override
public void serialize(Page value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
RestResponsePage page = new RestResponsePage();
// manually copy fields as dozer mapper doesn't seem to handle Page right
page.getContent().addAll(value.getContent());
page.setLast(value.isLast());
page.setTotalElements(value.getTotalElements());
page.setTotalPages(value.getTotalPages());
page.setNumber(value.getNumber());
page.setNumberOfElements(value.getNumberOfElements());
page.setSize(value.getSize());
page.setFirst(value.isFirst());
page.setSort(mapper.map(value.getSort(), RestResponsePage.Sort.class));
// serialize using default behavior
serializers.defaultSerializeValue(page, gen);
}
@Override
public Class<Page> handledType() {
return Page.class;
}
});
}
}
然后阅读回复只是映射到RestResonsePage这是一个简单的POJO：
/**
* Originally this POJO was extending {@link org.springframework.data.domain.PageImpl}.
* As of Spring Data release train Kay, {@link org.springframework.data.domain.PageImpl} was not deserializing correctly with Jackson.
* <br><br>
* This should be replaced by a more generic Page Resource or some more standard paging mechanism
*
* @param <T> type of the elements from the content list
*/
public class RestResponsePage<T> implements Serializable {
/** The Constant serialVersionUID. */
private static final long serialVersionUID = 3248189030448292002L;
public static class Sort {
private String direction = "ASC";
private String nullHandling = "NATIVE";
private boolean ascending = true;
private String property;
private boolean ignoreCase;
public String getDirection() {
return direction;
}
public void setDirection(String direction) {
this.direction = direction;
}
public String getProperty() {
return property;
}
public void setProperty(String property) {
this.property = property;
}
public String getNullHandling() {
return nullHandling;
}
public void setNullHandling(String nullHandling) {
this.nullHandling = nullHandling;
}
public boolean isIgnoreCase() {
return ignoreCase;
}
public void setIgnoreCase(boolean ignoreCase) {
this.ignoreCase = ignoreCase;
}
public boolean isAscending() {
return ascending;
}
public void setAscending(boolean ascending) {
this.ascending = ascending;
}
}
private List<T> content = new ArrayList<>();
private boolean last, first;
private int totalPages, numberOfElements, size, number;
private long totalElements;
private Sort sort;
public List<T> getContent() {
return content;
}
public void setContent(List<T> content) {
this.content = content;
}
public boolean isLast() {
return last;
}
public void setLast(boolean last) {
this.last = last;
}
public boolean isFirst() {
return first;
}
public void setFirst(boolean first) {
this.first = first;
}
public long getTotalElements() {
return totalElements;
}
public void setTotalElements(long totalElements) {
this.totalElements = totalElements;
}
public int getTotalPages() {
return totalPages;
}
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
public int getNumberOfElements() {
return numberOfElements;
}
public void setNumberOfElements(int numberOfElements) {
this.numberOfElements = numberOfElements;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public Sort getSort() {
return sort;
}
public void setSort(Sort sort) {
this.sort = sort;
}
}
答案 1 :(得分：1)
对我有用的是映射到自定义PageResponse，类似于Rwanou的回答。
@JsonIgnoreProperties(ignoreUnknown = true)
public class PageResponse<T> {
private List<T> content;
private int totalPages;
private int totalElements;
private int size;
private int number;
private int numberOfElements;
private boolean first;
private boolean last;
private CustomPageable pageable;
//getters & setters
public Page<T> pageImpl() {
return new PageImpl<>(getContent(), getPageable(), getTotalElements());
}
}
主要问题似乎是解析器难以解析Pageable接口。使用实现AbstractPageRequest或PageRequest也不起作用，因为两者都没有默认的构造函数。
因此，我将PageResponse.pageable的类型更改为CustomPageable，它只是PageRequest的包装：
@JsonIgnoreProperties(ignoreUnknown = true)
public class CustomPageable extends PageRequest {
public CustomPageable() {
super(0, Constants.PAGE_SIZE);
}
}
有了这两个类，就不需要进一步的Jackson配置。