Question

我正在使用Spring Tool Suite IDE。我的项目结构如下所示。

但是当我尝试运行控制器时，出现以下错误。

警告：org.springframework.web.context.support.XmlWebApplicationContext - 在上下文初始化期间遇到异常 - 取消刷新尝试：org.springframework.beans.factory.BeanCreationException：创建文件[F]中定义名为'textEditorController'的bean时出错：\ STS \ sts-bundle \ pivotal-tc-server-developer-3.2.4.SR1 \ base-instance \ wtpwebapps \ PostGres \ WEB-INF \ classes \ com \ postgres \ controllers \ TextEditorController.class]：bean的实例化失败;嵌套异常是org.springframework.beans.BeanInstantiationException：无法实例化[com.postgres.controllers.TextEditorController]：构造函数抛出异常;嵌套异常是org.springframework.beans.factory.BeanDefinitionStoreException：IOException从类路径资源解析XML文档[Spring-Module.xml];嵌套异常是java.io.FileNotFoundException：类路径资源[Spring-Module.xml]无法打开，因为它不存在错误：org.springframework.web.servlet.DispatcherServlet - 上下文初始化失败 org.springframework.beans.factory.BeanCreationException：在文件[F：\ STS \ sts-bundle \ pivotal-tc-server-developer-3.2.4.SR1 \ base-instance \ wtpwebapps中定义的名称为'textEditorController'的bean创建时出错\ PostGres \ WEB-INF \ classes \ com \ postgres \ controllers \ TextEditorController.class]：bean的实例化失败;嵌套异常是org.springframework.beans.BeanInstantiationException：无法实例化[com.postgres.controllers.TextEditorController]：构造函数抛出异常;嵌套异常是org.springframework.beans.factory.BeanDefinitionStoreException：IOException从类路径资源解析XML文档[Spring-Module.xml];嵌套异常是java.io.FileNotFoundException：无法打开类路径资源[Spring-Module.xml]，因为它不存在

TextEditorController.java课程如下所示。

package com.postgres.controllers;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.postgres.dao.CustomerDao;
import com.postgres.models.Customer;
import com.fasterxml.jackson.databind.util.JSONPObject;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;

/**
 * Handles requests for the application home page.
 */
@Controller
public class TextEditorController {

    ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Module.xml");
    CustomerDao customerDAO = (CustomerDao) context.getBean("CustomerDao");

    private static final Logger logger = LoggerFactory.getLogger(HomeController.class);

    /**
     * Simply selects the home view to render by returning its name.
     */
    @RequestMapping(value = "/editor", method = RequestMethod.GET)
    public String home(Locale locale, Model model) {

        //ApplicationContext context =
                //new ClassPathXmlApplicationContext("Spring-Module.xml");

           // CustomerDao customerDAO = (CustomerDao) context.getBean("CustomerDao");
           // Customer customer = new Customer(5, "mkyong",28);
           // customerDAO.insert();

           // Customer customer1 = customerDAO.findByCustomerId(1);
           // System.out.println(customer1);

        logger.info("Welcome home! The client locale is {}.", locale);

        return "TextEditor";
    }


    @RequestMapping(value= "/add", method = RequestMethod.POST)
    public @ResponseBody
    String add(HttpServletRequest request, HttpServletResponse response)
    throws Exception {

        String queryString = request.getParameter("query");
        String msg = customerDAO.insert(queryString);
      System.out.println(msg);

    return msg;

 }

    @RequestMapping(value= "/result", method = RequestMethod.POST)
    public @ResponseBody
    String result(HttpServletRequest request, HttpServletResponse response)
    throws Exception {

        Map<Integer, List<String>> map = new HashMap<Integer, List<String>>();

        String queryString = request.getParameter("query");

        map = customerDAO.findByCustomerId(queryString);
        Gson gson = new Gson();
        String element = gson.toJson(map);


                return element;


 }
    @RequestMapping(value= "/tables", method = RequestMethod.POST)
    public @ResponseBody
    String tables(HttpServletRequest request, HttpServletResponse response)
    throws Exception {

        Map<String, List<String>> alvalues = new  HashMap<String, List<String>>();;  
        String queryString = request.getParameter("query");
    //  ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Module.xml");

        //CustomerDao customerDAO = (CustomerDao) context.getBean("CustomerDao");
        alvalues = customerDAO.getAllTables();
        Gson gson = new Gson();
        String element = gson.toJson(alvalues);
            System.out.println(element);

                return element;


 }

    @RequestMapping(value= "/queryplan", method = RequestMethod.POST)
    public @ResponseBody
    String queryplan(HttpServletRequest request, HttpServletResponse response)
    throws Exception {

        ArrayList<String> alvalues = new ArrayList<String>();    
        String queryString = request.getParameter("query");
        //ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Module.xml");

        //CustomerDao customerDAO = (CustomerDao) context.getBean("CustomerDao");
        alvalues = customerDAO.getQueryPlans(queryString);

        customerDAO.getQueryPlans(queryString);
        Gson gson = new Gson();
        String response1= gson.toJson(alvalues);
        System.out.println(response1);

        return response1;


 }


    @RequestMapping(value= "/setDatabase", method = RequestMethod.POST)
    public @ResponseBody
    String setDatabase(HttpServletRequest request, HttpServletResponse response)
    throws Exception {

        String database = request.getParameter("dataBase");
        //ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Module.xml");
        //CustomerDao customerDAO = (CustomerDao) context.getBean("CustomerDao");
        String statement = customerDAO.setDefaultDatabse(database);

        return statement;



 }

}

因此，由于此错误，我的浏览器会抛出以下异常。

这方面的任何建议都将受到高度赞赏

Answer 1

我认为代码中存在一个基本的误解。在您的控制器中，不需要为某个XML文件实例化ClassPathXmlApplicationContext，然后使用它来获取特定的bean。这不是依赖注入的全部内容。

如果你肯定想为你的Spring应用程序使用XML定义，你应该在那里定义你的bean（如果你愿意）并使用@Autowired，例如，将CustomerDAO实例注入你的控制器。

更好的解决方案是忘记所有XML配置并开始使用Spring Boot来实现您的Web应用程序。有数以百万计的例子如何做到这一点，包括一些指南（https://spring.io/guides）和一个很棒的项目页面，以便开始http://projects.spring.io/spring-boot/

希望有所帮助!!!

在STS

1 个答案: