java - 使用 REST 模板和 JSON 响应格式在 Spring MVC 上返回 Http Status 500

标签 java json spring rest

我的项目由以下四个表组成:

  1. 问题 - Question_id、问题文本
  2. 用户 - User_ID、姓名
  3. Question_Answer - 用户 ID、Question_ID、答案
  4. 问题类型 - 问题 ID、标签

我必须根据多个标签生成问题

或者简单地返回所有问题的列表(未提供标签时)

或者将用户提供的答案插入到Question_Answer表中。

Controller类SpringServiceController.java(生成JSON格式的结果)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 类执行 DAO Activity ，如下所示:

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;
}

}

执行项目时(Apache Tomcat 7.0.12)，其生成的以下 URL 为 HTTP STATUS 500 

http://localhost:8080/FetchQuestions/insertQuestionAnswer/3/9/True

此外，当我执行以下 URL 时，它会生成 HTTP 状态 405 - 不支持请求方法“GET”

http://localhost:8080/FetchQuestions/service/question/insert/3/9/True

我做错了什么？我错过了什么吗？

HTTP 状态 500 的堆栈跟踪如下:

SEVERE: Servlet.service() for servlet [rest] in context with path [/FetchQuestions] threw exception [Request processing failed; nested exception is org.springframework.web.client.HttpClientErrorException: 405 Method Not Allowed] with root cause org.springframework.web.client.HttpClientErrorException: 405 Method Not Allowed at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91) at org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:576) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:532) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:489) at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:226) at com.bargadss.SpringService.Controller.ListQuestionController.insertQuestionAnswer(ListQuestionController.java:47) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 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:748) 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:945) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822) at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)

最佳答案

Also When I Execute The Following URL it generates HTTP Status 405 - Request method 'GET' not supported

将SpringServiceController.SpringServiceController方法的请求方式从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")

关于java - 使用 REST 模板和 JSON 响应格式在 Spring MVC 上返回 Http Status 500，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26607054/

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