Java 无法反序列化实例，超出起始\u数组标记
我需要向Web服务发送post请求，但它返回以下异常Java 无法反序列化实例，超出起始\u数组标记,java,json,web-services,jackson,Java,Json,Web Services,Jackson,我需要向Web服务发送post请求，但它返回以下异常 java.io.IOException: Server returned HTTP response code: 500 for URL domain.com 实际服务器响应如下所示： <html> <head><title>500 Servlet Exception</title></head> <body> <h1>500 Servlet Except
java.io.IOException: Server returned HTTP response code: 500 for URL domain.com
<html>
<head><title>500 Servlet Exception</title></head>
<body>
<h1>500 Servlet Exception</h1>
<code><pre>
<script language='javascript' type='text/javascript'>
function show() { document.getElementById('trace').style.display = ''; }
</script>
<a style="text-decoration" href="javascript:show();">[show]</a> org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance
of com.domain.service.beans.spec.SearchSpec out of START_ARRAY token
at [Source: com.caucho.server.connection.ServletInputStreamImpl@7aafd4d3; line: 1, column: 1]
<span id="trace" style="display:none">
org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance
of com.domain.service.beans.spec.SearchSpec out of START_ARRAY token
at [Source: com.caucho.server.connection.ServletInputStreamImpl@7aafd4d3; line: 1, column: 1]
at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:219)
at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:212)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromArray(BeanDeserializer.java:875)
at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:597)
at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2732)
at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1923)
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:135)
at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:154)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.readWithMessageConverters(HandlerMethodInvoker.java:643)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveRequestBody(HandlerMethodInvoker.java:607)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:346)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:171)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:427)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:415)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:788)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:153)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
at com.domain.service.filter.LoggingFilter.doFilter(LoggingFilter.java:91)
at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265)
at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:436)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682)
at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:743)
at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:662)
at java.lang.Thread.run(Thread.java:662)
</span>
</pre></code>
</body></html>
JSONArray jsarray = new JSONArray();
jsarray.add(obj);
服务器错误表明它不需要对象数组。删除此代码
为什么要这样创建json？为什么不使用模型，然后您就可以使用Jackson ObjectMapper来创建请求数据？无论哪种方式，服务器似乎都不满意，因为您正在发送阵列如何使用ObjectMapper？我知道如何将XML响应解析为对象，但不知道JSON，您能帮忙吗。
public void Search() {
JSONObject obj = new JSONObject();
obj.put("startDate", "2014-08-25");
obj.put("endDate", "2014-08-25");
obj.put("topX", "1-5");
obj.put("destId", 684);
obj.put("currencyCode", "EUR");
obj.put("catId", 21);
obj.put("subCatId", 78);
obj.put("dealsOnly", false);
obj.put("sortOrder","PRICE_FROM_A");
JSONArray jsarray = new JSONArray();
jsarray.add(obj);
putDataToServer(jsarray.toJSONString());
}
public void putDataToServer(String returnedJObject) {
try{
java.lang.String contentToPost = returnedJObject;
java.net.URLConnection connection = new java.net.URL("domain.com").openConnection();
connection.setUseCaches(true);
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestProperty("Content-Length", "" + contentToPost.length());
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("Cache-Control", "no-cache");
java.io.OutputStream stream = connection.getOutputStream();
stream.write(contentToPost.getBytes());
stream.close();
System.err.println("request is sent");
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
System.err.println(br.readLine());
br.close();
}catch(Exception e){
e.printStackTrace();
}
}
JSONArray jsarray = new JSONArray();
jsarray.add(obj);