我一直在网上对我的问题进行一些研究，我觉得我的代码反映了大多数示例中编写的内容 - 然而，它仍然不起作用。这就是我的问题。
长话短说，我想发送 POST 请求以将新项目添加到某些“后端”。对于 REST API，我使用 Spring MVC，为了发送请求，我使用 AngularJS 中的 $http
这就是我调用 POST 请求的方式
$scope.testAddItem = function(){
$http({
'url' : 'addNewItem',
'method' : 'POST',
'headers': {'Content-Type' : 'application/json'},
'data' : $scope.newItem
}).success(function(data){
$scope.marketForm.texts.push({'text' : data.text});
})
}
它映射到正确的 URL。问题是我得到以下响应
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>Error 400 BAD_REQUEST</title>
</head>
<body><h2>HTTP ERROR 400</h2>
<p>Problem accessing /poll/addNewItem/. Reason:
<pre> BAD_REQUEST</pre></p><hr /><i><small>Powered by Jetty://</small></i><br/>
当我单击网站上的按钮以及通过某些 REST 客户端进行测试时，我都会收到此错误。
我已包含在 pom.xml 中的依赖项
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
需要注意的是 - 通过 GET 发送其他请求是可行的。
我的控制器类
@Controller
@RequestMapping(value = "/")
public class PollController {
@RequestMapping(method = RequestMethod.GET)
public String mainPage(){
return "poll";
}
@RequestMapping(value = "/getNewElement")
public @ResponseBody
List<PollItem> getNewElement(){
List<PollItem> listOfItems = new ArrayList<PollItem>(2);
listOfItems.add(new PollItem("test 1"));
listOfItems.add(new PollItem("test 2"));
return listOfItems;
}
@RequestMapping(value = "/addNewItem", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
public @ResponseBody PollItem addNewElement(@RequestBody PollItem pollItem){
pollItem.setId(2); // I know it makes no logical sense, but it's just for testing.
return pollItem;
}
}
有什么线索吗？
EDIT
添加调试模式后，似乎是一些 JSON 解析问题
Method [public com.poll.model.PollItem com.poll.controller.PollController.addNewElement(com.poll.model.PollItem)]
org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Unexpected character ('a' (code 97)): expected a valid value (number, String, arr
ay, object, 'true', 'false' or 'null')
at [Source: HttpInputOverHTTP@5ce15706; line: 1, column: 2]; nested exception is org.codehaus.jackson.JsonParseException: Unexpected character ('a' (code 97)): expected
a valid value (number, String, array, object, 'true', 'false' or 'null')
at [Source: HttpInputOverHTTP@5ce15706; line: 1, column: 2]
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readJavaType(MappingJacksonHttpMessageConverter.java:187)
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.read(MappingJacksonHttpMessageConverter.java:179)
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodAr
gumentResolver.java:138)
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:183)
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:98)
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:79)
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:157)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:124)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:738)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:551)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1111)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:478)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1045)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:199)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:462)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:279)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:534)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
at java.lang.Thread.run(Thread.java:724)
Caused by: org.codehaus.jackson.JsonParseException: Unexpected character ('a' (code 97)): expected a valid value (number, String, array, object, 'true', 'false' or 'null'
)
at [Source: HttpInputOverHTTP@5ce15706; line: 1, column: 2]
at org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1433)
at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:521)
at org.codehaus.jackson.impl.JsonParserMinimalBase._reportUnexpectedChar(JsonParserMinimalBase.java:442)
at org.codehaus.jackson.impl.Utf8StreamParser._handleUnexpectedValue(Utf8StreamParser.java:2090)
at org.codehaus.jackson.impl.Utf8StreamParser._nextTokenNotInObject(Utf8StreamParser.java:606)
at org.codehaus.jackson.impl.Utf8StreamParser.nextToken(Utf8StreamParser.java:492)
at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2770)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2718)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1923)
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readJavaType(MappingJacksonHttpMessageConverter.java:184)
... 38 more
EDIT2
看起来它有效，问题是它只支持“（双引号），我想使用单引号。在执行 JSON 时，我是否应该始终使用双引号？
我应该做什么来改变 JSON 映射器的默认行为？
