SpringMVC快速入门

创建maven web工程，引入依赖

 
 
    5.0.2.RELEASE
 
 
     
        org.springframework 
        spring-context 
        ${spring.version} 
     
     
        org.springframework 
        spring-web 
        ${spring.version} 
     
    
         org.springframework 
        spring-webmvc 
        ${spring.version} 
     
     
        javax.servlet
         servlet-api
         2.5 
        provided 
     
     
        javax.servlet.jsp 
        jsp-api 
        2.0 
        provided 
      

在wweb.xml中配置前端控制器（最重要）,配置中文乱码过滤器

  Archetype Created Web Application

  
  
    dispatcherServlet
    org.springframework.web.servlet.DispatcherServlet
     
    
      contextConfigLocation
      classpath:springmvc.xml
    
    
    1
  
  
    dispatcherServlet
    /
  

  
  
    characterEncodingFilter
    org.springframework.web.filter.CharacterEncodingFilter
    
      encoding
      UTF-8
    
  
  
    characterEncodingFilter
    /*
  

编写springMVC的配置文件

编写index.jsp和HelloController

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


    
入门程序
    testString
    

    testVoid
    

    testModelAndView
    

    testException
    

    
拦截器
    testInterceptor

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("/testString")
    public String testString(Model model) {
        System.out.println("testString方法执行了");

        //模拟从数据库查出来用户
        User user = new User();
        user.setUsername("小明");
        user.setPassword("1234");
        user.setAge(19);

        //存到model对象
        model.addAttribute("user", user);
        return "success";
    }

    @RequestMapping("/testVoid")
    public void testVoid(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("testVoid方法执行了");
//        request.getRequestDispatcher("/WEB-INF/pages/success.jsp").forward(request,response);
//        response.sendRedirect(request.getContextPath()+"/index2.jsp");
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=utf-8");
        response.getWriter().println("
你好
");
        return;
    }

    @RequestMapping("/testModelAndView")
    public ModelAndView testModelAndView() {
        System.out.println("testModelAndView方法执行了");

        ModelAndView mv = new ModelAndView();

        User user = new User();
        user.setUsername("小丑");
        user.setPassword("1234");
        user.setAge(19);

        mv.addObject("user", user);
        mv.setViewName("success");
        return mv;
    }

    @RequestMapping("/testAjax")
    public @ResponseBody User testAjax(@RequestBody User user) {
        System.out.println("testAjax方法执行了");
        System.out.println(user);

        //响应，模拟查询数据库
        user.setUsername("Rose");
        user.setAge(33);
        return user;

    }

    @RequestMapping("/fileUpload1")
    public String fileUpload1(HttpServletRequest request) throws Exception {
        System.out.println("fileUpload1方法执行了");
        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        File file = new File(path);
        if (!file.exists()) {
            file.mkdirs();
        }
        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);

        List fileItems = upload.parseRequest(request);

        for (FileItem item : fileItems) {
            if (item.isFormField()) {
                //普通
            } else {
                //文件
                String name = item.getName();
                String s = UUID.randomUUID().toString().replace("-", "");
                name = s + name;
                item.write(new File(path, name));
                item.delete();
            }
        }

        return "success";
    }

    @RequestMapping("/fileUpload2")
    public String fileUpload2(HttpServletRequest request, MultipartFile upload) throws Exception {
        System.out.println("fileUpload2方法执行了");

        String path = request.getSession().getServletContext().getRealPath("/uploads/");
        File file = new File(path);
        if (!file.exists()) {
            file.mkdirs();
        }

        String name = upload.getOriginalFilename();
        String s = UUID.randomUUID().toString().replace("-", "");
        name = s + name;
        upload.transferTo(new File(path, name));
        return "success";
    }

    @RequestMapping("/fileUpload3")
    public String fileUpload3(MultipartFile upload) throws Exception {
        System.out.println("fileUpload3方法执行了");
        //定义上传服务器的路径
        String path = "http://localhost:8081/uploads/";

        String name = upload.getOriginalFilename();
        String s = UUID.randomUUID().toString().replace("-", "");
        name = s + name;
        //跨服务器上传
        //创建客户端对象
        Client client = Client.create();
        //和服务器连接
        WebResource resource = client.resource(path + name);
        //上传
        resource.put(upload.getBytes());
        return "success";
    }

    @RequestMapping("/testException")
    public String testException() throws SysException {
        System.out.println("testException方法执行了");
        try {
            int a = 10 / 0;
        } catch (Exception e) {
            e.printStackTrace();
            throw new SysException("查询所有用户出现错误");
        }
        return "success";
    }

    @RequestMapping("/testInterceptor")
    public String testInterceptor() {
        System.out.println("testInterceptor方法执行了");

        return "success";
    }

}

在WEB-INF目录下创建pages文件夹，编写success.jsp的成功页面

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>


    



    
执行成功

    ${user.username}
    ${user.password}
    ${user.age}
    <% System.out.println("success.jsp执行了"); %>

启动Tomcat服务器，进行测试

项目结构