我正在开发使用 Spring 4.3.2.Release 和 hibernate 5.2.9.Final 版本的项目。这是一个基于 Spring + hibernate + Restful 服务的示例。
在进行演示时，我收到错误:未找到转换器:
以下是我的代码的凭据。
servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
<context:annotation-config/>
<context:component-scan base-package="practice.ngresource.tryone.controller.**"></context:component-scan>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/views/"></property>
<property name="suffix" value=".html"></property>
</bean>
</beans>
这是休息 Controller 。
import org.springframework.web.bind.annotation.RestController;
import practice.ngresource.tryone.model.Task;
@RestController
@RequestMapping("/trialone")
public class TrialController {
@ResponseStatus(HttpStatus.OK)
@RequestMapping(value="/trial",method=RequestMethod.GET)
public List<Task> taskList(){
System.out.println("inside the gettasklist");
List<Task> list = new ArrayList<>();
list.add(new Task("one","oneDesc","completed"));
list.add(new Task("Two","twoDesc","completed"));
list.add(new Task("Three","threeDesc","pending"));
list.add(new Task("four","fourDesc","pending"));
list.add(new Task("five","fiveDesc","completed"));
return list;
}
}
查看对应的JS页面是:
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body ng-app="trial1App" ng-controller="trialController as tCont">
<h1>The Task List is as follow</h1>
<div>
<table>
<tr ng-repeat="data in tCont.tasks">
<td>{{data.taskName}}</td>
</tr>
</table>
</div>
<script type="text/javascript"
src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script>
<script type="text/javascript"
src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular-resource.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
var trialApp = angular.module('trial1App', ['ngResource']);
trialApp.factory('Task',['$resource',function($resource){
return $resource('http://localhost:8080/NgRes_Prac_001/trialone/trial/:trialId',
{trialId:'@tId'},
{
updateTask : {method : 'PUT'}
});
}]);
trialApp.controller('trialController', ['$scope','Task',function($scope,Task){
var ob = this;
ob.tasks = [];
ob.fetchAllTasks = function(){
console.log("Inside Fetch all list");
ob.tasks = Task.query();
console.log("Fetch List Completed");
};
ob.fetchAllTasks();
}]);
</script>
</body>
</html>
以下是我的错误状态。
Apr 17, 2017 1:43:24 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [ngRs001] in context with path [/NgRes_Prac_001] threw exception [Request processing failed; nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList] with root cause
java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:188)
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:173)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:130)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
请帮我解决这个问题。 提前致谢。
最佳答案
如果您的 Controller 上有@RestController，这应该足以将您的数据转换为 JSON 字符串，但是，我查了一下，似乎您在任务类中缺少 getters\setters。
根据:
How to return JSON data from spring Controller using @ResponseBody
和:
java.lang.IllegalArgumentException: No converter found for return value of type
关于java - 如何克服未发现转换器错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43447844/