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我更新的春天平台版本1.1.3.RELEASE到2.0.1.RELEASE一个应用程序，它从颠簸4.1.7 Spring框架的版本4.2.4，和杰克逊从2.4.6到2.6.4。似乎没有一直在春季或杰克逊的处理的定制HttpMessageConverter实现任何显著的变化，但我的自定义JSON序列化失败发生，我一直无法确定原因。下面的工作在前面的春天平台释放细粒：自杰克逊HttpMessageConverter不再工作在春季4.2
型号
型号包装
public class ResponseEnvelope {
private Set<String> fieldSet;
private Set<String> exclude;
private Object entity;
public ResponseEnvelope(Object entity) {
this.entity = entity;
}
public ResponseEnvelope(Object entity, Set<String> fieldSet, Set<String> exclude) {
this.fieldSet = fieldSet;
this.exclude = exclude;
this.entity = entity;
}
public Object getEntity() {
return entity;
}
@JsonIgnore
public Set<String> getFieldSet() {
return fieldSet;
}
@JsonIgnore
public Set<String> getExclude() {
return exclude;
}
public void setExclude(Set<String> exclude) {
this.exclude = exclude;
}
public void setFieldSet(Set<String> fieldSet) {
this.fieldSet = fieldSet;
}
public void setFields(String fields) {
Set<String> fieldSet = new HashSet<String>();
if (fields != null) {
for (String field : fields.split(",")) {
fieldSet.add(field);
}
}
this.fieldSet = fieldSet;
}
}
控制器
@Controller
public class MyModelController {
@Autowired MyModelRepository myModelRepository;
@RequestMapping(value = "/model", method = RequestMethod.GET, produces = { MediaType.APPLICATION_JSON_VALUE })
public HttpEntity find(@RequestParam(required=false) Set<String> fields, @RequestParam(required=false) Set<String> exclude){
List<MyModel> objects = myModelRepository.findAll();
ResponseEnvelope envelope = new ResponseEnvelope(objects, fields, exclude);
return new ResponseEntity<>(envelope, HttpStatus.OK);
}
}
定制HttpMessageConverter
public class FilteringJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {
private boolean prefixJson = false;
@Override
public void setPrefixJson(boolean prefixJson) {
this.prefixJson = prefixJson;
super.setPrefixJson(prefixJson);
}
@Override
protected void writeInternal(Object object, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
ObjectMapper objectMapper = getObjectMapper();
JsonGenerator jsonGenerator = objectMapper.getFactory().createGenerator(outputMessage.getBody());
try {
if (this.prefixJson) {
jsonGenerator.writeRaw(")]}', ");
}
if (object instanceof ResponseEnvelope) {
ResponseEnvelope envelope = (ResponseEnvelope) object;
Object entity = envelope.getEntity();
Set<String> fieldSet = envelope.getFieldSet();
Set<String> exclude = envelope.getExclude();
FilterProvider filters = null;
if (fieldSet != null && !fieldSet.isEmpty()) {
filters = new SimpleFilterProvider()
.addFilter("fieldFilter", SimpleBeanPropertyFilter.filterOutAllExcept(fieldSet))
.setFailOnUnknownId(false);
} else if (exclude != null && !exclude.isEmpty()) {
filters = new SimpleFilterProvider()
.addFilter("fieldFilter", SimpleBeanPropertyFilter.serializeAllExcept(exclude))
.setFailOnUnknownId(false);
} else {
filters = new SimpleFilterProvider()
.addFilter("fieldFilter", SimpleBeanPropertyFilter.serializeAllExcept())
.setFailOnUnknownId(false);
}
objectMapper.setFilterProvider(filters);
objectMapper.writeValue(jsonGenerator, entity);
} else if (object == null){
jsonGenerator.writeNull();
} else {
FilterProvider filters = new SimpleFilterProvider().setFailOnUnknownId(false);
objectMapper.setFilterProvider(filters);
objectMapper.writeValue(jsonGenerator, object);
}
} catch (JsonProcessingException e){
e.printStackTrace();
throw new HttpMessageNotWritableException("Could not write JSON: " + e.getMessage());
}
}
}
配置
@Configuration
@EnableWebMvc
public class WebServicesConfig extends WebMvcConfigurerAdapter {
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
FilteringJackson2HttpMessageConverter jsonConverter = new FilteringJackson2HttpMessageConverter();
jsonConverter.setSupportedMediaTypes(MediaTypes.APPLICATION_JSON);
converters.add(jsonConverter);
}
// Other configurations
}
现在我得到这个异常（这是由春天捕获和记录），使任何类型的请求时出现500错误：
[main] WARN o.s.w.s.m.s.DefaultHandlerExceptionResolver - Failed to write HTTP message:
org.springframework.http.converter.HttpMessageNotWritableException: Could not write content:
Can not resolve PropertyFilter with id 'fieldFilter';
no FilterProvider configured (through reference chain:
org.oncoblocks.centromere.web.controller.ResponseEnvelope["entity"]->java.util.ArrayList[0]);
nested exception is com.fasterxml.jackson.databind.JsonMappingException:
Can not resolve PropertyFilter with id 'fieldFilter';
no FilterProvider configured (through reference chain:
org.oncoblocks.centromere.web.controller.ResponseEnvelope["entity"]->java.util.ArrayList[0])
的configureMessageConverters方法执行，但它看起来不像自定义转换器在请求期间被使用过。是否有可能另一个消息转换器可以阻止这个人得到我的回应？我的理解是压倒一切的configureMessageConverters将阻止比正在使用的手动注册之外的其它转换器。
除了通过Spring Platform更新依赖版本之外，未对此代码的工作版本和非工作版本进行更改。在文档中我只是缺少JSON序列化中的任何更改吗？
编辑
进一步的测试产量奇怪的结果。我想测试检查以下内容：
- 是我的自定义
HttpMessageConverter实际上被注册？ - 是另一种转换器重写/浪呢？
- 这是只有我的测试设置有问题？
所以，我增加了一个额外的测试，并拍了一下输出：
@Autowired WebApplicationContext webApplicationContext;
@Before
public void setup(){
mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
}
@Test
public void test() throws Exception {
RequestMappingHandlerAdapter adapter = (RequestMappingHandlerAdapter) webApplicationContext.getBean("requestMappingHandlerAdapter");
List<EntrezGene> genes = EntrezGene.createDummyData();
Set<String> exclude = new HashSet<>();
exclude.add("entrezGeneId");
ResponseEnvelope envelope = new ResponseEnvelope(genes, new HashSet<String>(), exclude);
for (HttpMessageConverter converter: adapter.getMessageConverters()){
System.out.println(converter.getClass().getName());
if (converter.canWrite(ResponseEnvelope.class, MediaType.APPLICATION_JSON)){
MockHttpOutputMessage message = new MockHttpOutputMessage();
converter.write((Object) envelope, MediaType.APPLICATION_JSON, message);
System.out.println(message.getBodyAsString());
}
}
}
...并能正常工作。我的envelope对象及其内容被序列化并正确过滤。因此，要么在到达消息转换器之前处理请求问题，要么在MockMvc测试请求方面发生了变化。
下降'configureMessageConverters'一个断点，并确保它的执行。 – chrylis
@chrylis：已经试过这个，配置方法正在执行。 – woemler
你能提供完整的堆栈跟踪吗？ –