如何在Spring应用程序中修改有效负载响应数据？

问题描述

我正在尝试向使用Spring Boot实现的Web服务的响应添加随机有效负载。我当前的方法是注册一个ControllerAdvice组件，该组件以以下方式修改响应主体：

@ControllerAdvice
public class PayloadInflater implements ResponseBodyAdvice {

    protected Logger _logger = Logger.getLogger(PayloadInflater.class.getName());

    @Value("${network.increased-payload:false}")
    private boolean increasedPayload;
    @Value("${network.payload-size:1000000}")
    private int payloadSize;

    @Override
    public boolean supports(MethodParameter returnType,Class converterType) {
        return increasedPayload;
    }

    @Override
    public Object beforeBodyWrite(Object body,MethodParameter returnType,MediaType selectedContentType,Class selectedConverterType,ServerHttpRequest request,ServerHttpResponse response) {
        byte[] randomData = new byte[payloadSize];
        _logger.info("Generating random data programmatically");
        new Random().nextBytes(randomData);

        Map<String,Object> map = new HashMap<>();
        map.put("payload",body);
        map.put("benchmarkPayload",randomData);
        return map;
    }
}

现在的问题是，我在Spring Boot中也实现了一个前端应用程序，并使用RestTemplate，但是我无法正确反序列化来自服务的消息。

org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Can not deserialize instance of java.lang.Boolean out of START_OBJECT token
 at [Source: java.io.PushbackInputStream@36ac8a63; line: 1,column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.Boolean out of START_OBJECT token
 at [Source: java.io.PushbackInputStream@36ac8a63; line: 1,column: 1]
        at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:240)
        at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:225)
        at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:95)
        at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:917)
        at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:901)
        at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655)
        at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613)
        at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:531)
        at DeserializationTest.deserializationTest(DeserializationTest.java:52)
        at DeserializationTest.deserializationTest(DeserializationTest.java:42)
        at DeserializationTest.whenReadingBoolean_thenCorrect(DeserializationTest.java:33)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
        at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
        at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
        at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
        at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
        at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
        at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
        at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
        at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
        at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
        at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.Boolean out of START_OBJECT token
 at [Source: java.io.PushbackInputStream@36ac8a63; line: 1,column: 1]
        at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
        at com.fasterxml.jackson.databind.DeserializationContext.reportMappingException(DeserializationContext.java:1234)
        at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1122)
        at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1075)
        at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseBoolean(StdDeserializer.java:220)
        at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$BooleanDeserializer.deserialize(NumberDeserializers.java:178)
        at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$BooleanDeserializer.deserialize(NumberDeserializers.java:161)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3798)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2922)
        at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:237)
        ... 45 more

这是从服务获取正文数据的示例：

{
   "payload": true,"benchmarkPayload": "this is a random string"
}

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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