[英]Http Status 500 returned on Spring MVC Using REST Templates and JSON Response Format
我的项目由以下四个表组成:
我必须根据多个标签生成问题
或仅返回所有问题的列表(如果未提供标签)
或将用户提供的答案插入Question_Answer表中。
Controller类SpringServiceController.java (以JSON格式生成结果)如下:
package com.bargadss.SpringService.Controller;
import java.text.ParseException;
import java.util.List;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.bargadss.SpringService.DAO.QuestionService;
import com.bargadss.SpringService.Domain.*;
@RestController
@RequestMapping("/service/question/")
public class SpringServiceController {
QuestionService questionService=new QuestionService();
@RequestMapping(value = "/{tag1},{tag2},{tag3}", method = RequestMethod.GET,headers="Accept=application/json")
public List<Questions> getQuestions(@PathVariable("tag1") String tag1, @PathVariable("tag2") String tag2, @PathVariable("tag3") String tag3) {
List<Questions> Qobj=questionService.getQuestionByTag(tag1, tag2, tag3);
return Qobj;
}
@RequestMapping(method = RequestMethod.GET,headers="Accept=application/json")
public List<Questions> getAllQuestions() {
List<Questions> Qobj=questionService.getAllQuestion();
return Qobj;
}
@RequestMapping(value="/insert/{user_id}/{question_id}/{answer}",method = RequestMethod.POST,headers="Accept=application/json")
public List<Questions> addQuestions(@PathVariable int user_id,@PathVariable int question_id,@PathVariable String answer) throws ParseException {
Question_Answer qtnAns = new Question_Answer();
qtnAns.setUser_id(user_id);
qtnAns.setQuestion_id(question_id);
qtnAns.setAnswer(answer);
questionService.insertAnswer(qtnAns.getUser_id(), qtnAns.getQuestion_id(), qtnAns.getAnswer());
return questionService.getAllQuestion();
}
}
ListQuestionController.java使用Spring REST模板(生成JSP页面)如下:
package com.bargadss.SpringService.Controller;
import java.util.LinkedHashMap;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.servlet.ModelAndView;
import com.bargadss.SpringService.Domain.*;
@Controller
public class ListQuestionController {
@RequestMapping("/listQuestion/{tag1},{tag2},{tag3}")
public ModelAndView listQuestions(@PathVariable("tag1") String Tag1, @PathVariable("tag2") String Tag2, @PathVariable("tag3") String Tag3) {
RestTemplate restTemplate = new RestTemplate();
String url="http://localhost:8080/FetchQuestions/service/question/{tag1},{tag2},{tag3}";
List<LinkedHashMap> Qobj=restTemplate.getForObject(url, List.class,Tag1,Tag2,Tag3);
return new ModelAndView("listQuestion", "questions", Qobj);
}
@RequestMapping("/listAllQuestion/")
public ModelAndView listAllQuestion() {
RestTemplate restTemplate = new RestTemplate();
String url="http://localhost:8080/FetchQuestions/service/question/";
List<LinkedHashMap> Qobj=restTemplate.getForObject(url, List.class);
return new ModelAndView("listQuestion", "questions", Qobj);
}
@RequestMapping("/insertQuestionAnswer/{user_id}/{qtn_id}/{answer}")
public ModelAndView insertQuestionAnswer(@PathVariable("user_id") String user_ID,
@PathVariable("qtn_id") String qtn_ID, @PathVariable("answer") String answer) {
RestTemplate restTemplate = new RestTemplate();
String url="http://localhost:8080/FetchQuestions/service/question/insert/{user_id}/{qtn_id}/{answer}";
List<LinkedHashMap> Qobj=restTemplate.getForObject(url, List.class,user_ID,qtn_ID,answer);
return new ModelAndView("listQuestion", "questions", Qobj);
}
}
QuestionService.java类按以下方式执行DAO活动:
package com.bargadss.SpringService.DAO;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.List;
import com.bargadss.SpringService.Domain.*;
import com.bargadss.SpringService.Utility.DBUtility;
public class QuestionService {
private Connection connection;
public QuestionService() {
connection = DBUtility.getConnection();
}
public void insertAnswer(int userId,int qtnId,String answer){
//Question_Answer objQA = new Question_Answer();
PreparedStatement preparedStatement = null;
try{
preparedStatement = connection.prepareStatement("insert into question_answer values (?,?,?)");
preparedStatement.setInt(1, userId);
preparedStatement.setInt(2, qtnId);
preparedStatement.setString(3, answer);
int result = preparedStatement.executeUpdate();
if(result == 0)
System.out.println("INSERTION OF DATA FAILED");
} catch (SQLException e){
e.printStackTrace();
}
finally{
try { if (preparedStatement != null) preparedStatement.close(); } catch (Exception e) {System.out.println("Exception Closing The Prepared Statement");e.printStackTrace();};
}
}
public List<Questions> getAllQuestion(){
Questions objQ = new Questions();
ResultSet rs = null;
PreparedStatement preparedStatement = null;
List<Questions> qtns = new ArrayList<Questions>();
try {
preparedStatement = connection.prepareStatement("select * from questions");
rs = preparedStatement.executeQuery();
while(rs.next()) {
objQ.setQuestion_id(Integer.parseInt( rs.getString("Question_id") ) );
objQ.setQuestion_text(rs.getString("Question_Text"));
qtns.add(objQ);
}
} catch (SQLException e) {
e.printStackTrace();
}
finally{
try { if (rs != null) rs.close(); } catch (Exception e) {System.out.println("Exception Closing The result Set");e.printStackTrace();};
try { if (preparedStatement != null) preparedStatement.close(); } catch (Exception e) {System.out.println("Exception Closing The Prepared Statement");e.printStackTrace();};
/*try { if (connection != null) connection.close(); } catch (Exception e) {System.out.println("Exception Closing The Connection");e.printStackTrace();};*/
}
return qtns;
}
public List<Questions> getQuestionByTag(String Tag1,String Tag2,String Tag3){
Questions objQ = new Questions();
ResultSet rs = null;
PreparedStatement preparedStatement = null;
List<Questions> qtns = new ArrayList<Questions>();
try {
preparedStatement = connection.
prepareStatement("select questions.Question_id,questions.Question_Text from questions,questiontype " +
"where questions.Question_id=questiontype.Question_id " +
"and questiontype.Tag in (?,?,?)");
preparedStatement.setString(1, Tag1);
preparedStatement.setString(2, Tag2);
preparedStatement.setString(3, Tag3);
rs = preparedStatement.executeQuery();
while(rs.next()) {
objQ.setQuestion_id(Integer.parseInt( rs.getString("Question_id") ) );
objQ.setQuestion_text(rs.getString("Question_Text"));
qtns.add(objQ);
}
} catch (SQLException e) {
e.printStackTrace();
}
finally{
try { if (rs != null) rs.close(); } catch (Exception e) {System.out.println("Exception Closing The result Set");e.printStackTrace();};
try { if (preparedStatement != null) preparedStatement.close(); } catch (Exception e) {System.out.println("Exception Closing The Prepared Statement");e.printStackTrace();};
/*try { if (connection != null) connection.close(); } catch (Exception e) {System.out.println("Exception Closing The Connection");e.printStackTrace();};*/
}
return qtns;
}
}
在执行具有以下URL的项目(Apache Tomcat 7.0.12)时 ,它将生成HTTP STATUS 500
http://localhost:8080/FetchQuestions/insertQuestionAnswer/3/9/True
同样,当我执行以下URL时,它也会生成HTTP状态405-不支持请求方法“ GET”
http://localhost:8080/FetchQuestions/service/question/insert/3/9/True
我究竟做错了什么 ? 我想念什么吗?
HTTP状态500的堆栈跟踪如下:
严重:Servlet [rest]在路径为[/ FetchQuestions]的上下文中的Servlet.service()引发异常[请求处理失败; 嵌套的异常是org.springframework.web.client.HttpClientErrorException:“ 405方法不允许”,根本原因是org.springframework.web.client.HttpClientErrorException:在org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler。 org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:576)的org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:532)的org.springframework.web.client的java:91) org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:226)处的com.bargadss.SpringService.Controller.ListQuestionController.insertQuestionAnswer(ListQuestionController.java:47)处的.RestTemplate.execute(RestTemplate.java:489)位于java.lan的sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)处的sun.reflect.NativeMethodAccessorImpl.invoke0(本地方法) g.reflect.Method.invoke(Method.java:606)(位于org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)位于org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest( org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)处的org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod( org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)处的org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter。 org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)上的org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)上的java:83) 在org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)处的ringframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)在javax.servlet.http.HttpServlet.service(HttpServlet.java: 621),位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter的javax.servlet.http.HttpServlet.service(HttpServlet.java:722)的org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807) (org.apache.catalina.core。(ApplicationFilterChain.java:304)在org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)在org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)在。 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)上的catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java: 164),位于org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java: 100)在org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)在org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)在org.apache.catalina.connector.CoyoteAdapter org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)上的.service(CoyoteAdapter.java:395)org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process(Http11Protocol.java:188)上的.service(CoyoteAdapter.java:395) org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run(JIoEndpoint.java:302)处的org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process(Http11Protocol.java:166)在java.util.concurrent处。 ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:615)at java.lang.Thread.run(Thread.java:745)
同样,当我执行以下URL时,它也会生成HTTP状态405-不支持请求方法“ GET”
将SpringServiceController.SpringServiceController
方法的请求方法从POST
更改为GET
。 它应该可以解决您的问题。
@RequestMapping(value="/insert/{user_id}/{question_id}/{answer}",method = RequestMethod.GET,headers="Accept=application/json")
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