我正在使用 spring android rest 模板
并尝试将 JSON 响应转换为 java 类,如图所示 here .
这是我尝试完成这项工作的代码 fragment :
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJacksonHttpMessageConverter());
//I have already tried to manually setting converters with no luck
//List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
//messageConverters.add(new MappingJacksonHttpMessageConverter());
//messageConverters.add(new FormHttpMessageConverter());
//messageConverters.add(new StringHttpMessageConverter());
//restTemplate.setMessageConverters(messageConverters);
Result result = restTemplate.getForObject(url, Result.class);
我想我已经按照文档中的要求完成了所有要求:
- 我的类路径中有以下 jar
- jackson-all-1.7.6.jar
- spring-android-rest-template-1.0.0.M2.jar
url
确实返回一个 JSON 对象。- 我的
Result
类是一个包含所有必填字段的 POJO
基本上在我的类路径中有 Jackson 依赖项
必须足以让它像它所说的那样工作:
The MappingJacksonHttpMessageConverter is conditionally loaded when you create a new RestTemplate instance. If the Jackson dependencies are found in your classpath, the message converter will be automatically added and available for use in REST operations.
那么我在这里缺少什么,我做错了什么?
谢谢
可以在这里找到完整的异常:
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): FATAL EXCEPTION: main
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): java.lang.IllegalStateException: Could not execute method of the activity
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.view.View$1.onClick(View.java:2083)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.view.View.performClick(View.java:2421)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.view.View$PerformClick.run(View.java:8869)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.os.Handler.handleCallback(Handler.java:587)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.os.Handler.dispatchMessage(Handler.java:92)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.os.Looper.loop(Looper.java:143)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.app.ActivityThread.main(ActivityThread.java:5068)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at java.lang.reflect.Method.invokeNative(Native Method)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at java.lang.reflect.Method.invoke(Method.java:521)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at dalvik.system.NativeStart.main(Native Method)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): Caused by: java.lang.reflect.InvocationTargetException
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at xxx.SamplePageActivity.doRest(SamplePageActivity.java:83)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at java.lang.reflect.Method.invokeNative(Native Method)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at java.lang.reflect.Method.invoke(Method.java:521)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at android.view.View$1.onClick(View.java:2078)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): ... 11 more
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): Caused by: org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [[Lxxx.SamplePageActivity$Result;] and content type [application/json;charset=UTF-8]
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:77)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:449)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:404)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:202)
04-20 04:25:52.706: ERROR/AndroidRuntime(9638): ... 15 more
最佳答案
我从未在 Android 上做过任何事情,但我知道转换者对 Content-Type 很挑剔。为了让 Jackson 工作,消息正文需要有 'Content-Type: application/json'。尝试检查响应中的所有 header 。
关于机器人 RestClientException : no suitable HttpMessageConverter found,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5724697/