SpringMVC

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SpringMVC

1 SpringMVC简介

SpringMVC 隶属于 Spring ，是 Spring 技术中的一部分

SpringMVC 与 Servlet 技术功能等同，均属于web层或者说是表现层开发技术

SpringMVC 与 Servlet相比

开发起来更简单快捷，用更少的代码完成表现层代码的开发

1.1 Servlet例子

UserSaveServlet：使用Servlet开发的用户新增模块

@WebServlet("/user/save")
public class UserSaveServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.接收请求参数
        String name = req.getParameter("name");
        System.out.println("servlet save name ==> " + name);
        //2.生产响应
        resp.setContentType("text/json;charset=utf-8");
        PrintWriter pw = resp.getWriter();
        pw.write("{'module':'servlet save'}");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req,resp);
    }
}

UserUpdateServlet：使用Servlet开发的用户修改模块

@WebServlet("/user/update")
public class UserUpdateServlet extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.接收请求参数
        String name = req.getParameter("name");
        System.out.println("servlet update name ==> " + name);
        //2.生产响应
        resp.setContentType("text/json;charset=utf-8");
        PrintWriter pw = resp.getWriter();
        pw.write("{'module':'servlet update'}");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req,resp);
    }
}

UserDeleteServlet：使用Servlet开发的用户删除模块

@WebServlet("/user/delete")
public class UserDeleteServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.接收请求参数
        String name = req.getParameter("name");
        System.out.println("servlet delete name ==> " + name);
        //2.生产响应
        resp.setContentType("text/json;charset=utf-8");
        PrintWriter pw = resp.getWriter();
        pw.write("{'module':'servlet delete'}");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req,resp);
    }
}

UserDeleteServlet：使用Servlet开发的用户查询模块

@WebServlet("/user/select")
public class UserSelectServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.接收请求参数
        String name = req.getParameter("name");
        System.out.println("servlet select name ==> " + name);
        //2.生产响应
        resp.setContentType("text/json;charset=utf-8");
        PrintWriter pw = resp.getWriter();
        pw.write("{'module':'servlet select'}");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req,resp);
    }
}

启动项目，测试结果如下:

上面就是通过Servlet的方式来实现的用户模块的增删改查功能

1.2 springMVC例子

springmvc下的UserController类

@Controller
public class UserController {

    @RequestMapping("/save")
    @ResponseBody
    public String save(String name){
        System.out.println("springmvc save name ==> " + name);
        return "{'module':'springmvc save'}";
    }

    @RequestMapping("/delete")
    @ResponseBody
    public String delete(String name){
        System.out.println("springmvc delete name ==> " + name);
        return "{'module':'springmvc delete'}";
    }

    @RequestMapping("/update")
    @ResponseBody
    public String update(String name){
        System.out.println("springmvc update name ==> " + name);
        return "{'module':'springmvc update'}";
    }

    @RequestMapping("/select")
    @ResponseBody
    public String select(String name){
        System.out.println("springmvc select name ==> " + name);
        return "{'module':'springmvc select'}";
    }
}