spring工程重构为web工程步骤

web.xml：(里面添加)

  <!-- 确定spring配置文件位置 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-config.xml</param-value>
  </context-param>

  <!-- 配置spring 监听器，加载spring-config.xml配置文件 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

pom.xml：（添加依赖）

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.1.7.RELEASE</version>
    </dependency>

Servlet中添加：

  @Override
    public void init(ServletConfig config) throws ServletException
    {
        SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,

                config.getServletContext());
    }

AnimalServlet.java:

@WebServlet("/AniamlServlet")
public class AniamlServlet extends HttpServlet {
    @Override
    public void init(ServletConfig config) throws ServletException
    {
        SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this,

                config.getServletContext());
    }
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1 中文处理
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        //2 读取method参数
        String method=request.getParameter("method");
        //3 读取method参数，调用具体方法
        if ("findall".equals(method)){
            findAll(request,response);
        }
    }
    @Autowired
    private AnimalService animalService;
    private void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1读取请求参数
        List<Animal> list=animalService.findAll();
        //2 保存数据到request中
        request.setAttribute("list",list);
        //转发视图
        request.getRequestDispatcher("showall.jsp").forward(request,response);
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}