深入SpringMVC组件开发【1】

一、控制器接收各类请求参数

1.接收普通请求参数

/*接收普通参数 */@RequestMapping("/commonParams")public ModelAndView commonParams(String roleName, String note) {System.out.println("roleName =>" + roleName);System.out.println("note =>" + note);ModelAndView mv = new ModelAndView();mv.setViewName("index");return mv;}/*接收对象 */@RequestMapping("/commonParamPojo")public ModelAndView commonParamPojo(RoleParams roleParams) {System.out.println("roleName =>" + roleParams.getRoleName());System.out.println("note =>" + roleParams.getNote());ModelAndView mv = new ModelAndView();mv.setViewName("index");return mv;}

2.使用@RequestParam注解获取参数

/*使用@RequestParam("role_name")指定映射HTTP参数名称 */@RequestMapping("/requestParam")public ModelAndView requestParam(@RequestParam("role_name") String roleName, String note) {System.out.println("roleName =>" + roleName);System.out.println("note =>" + note);ModelAndView mv = new ModelAndView();mv.setViewName("index");return mv;}

3.使用URL传递参数

/*使用URL传递参数{id}代表接收一个参数注解@PathVariable表示从URL的请求地址中获取参数 */@RequestMapping("/getRole/{id}")public ModelAndView pathVariable(@PathVariable("id") Long id)  {Role role = roleService.getRole(id);ModelAndView mv = new ModelAndView();//绑定数据模型mv.addObject(role);//设置为JSON视图mv.setView(new MappingJackson2JsonView());return mv;}

4.传递JSON参数

@RequestMapping("/findRoles")public ModelAndView findRoles(@RequestBody RoleParams roleParams) {List<Role> roleList = roleService.findRoles(roleParams);ModelAndView mv = new ModelAndView();//绑定模型mv.addObject(roleList);//设置为JSON视图mv.setView(new MappingJackson2JsonView());return mv;}

5.接收列表数据和表单序列化

/* var idList = [1, 2, 3]; data: JSON.stringify(idList), */@RequestMapping("/deleteRoles")public ModelAndView deleteRoles(@RequestBody List<Long> idList) {ModelAndView mv = new ModelAndView();//删除角色int total = roleService.deleteRoles(idList);//绑定视图mv.addObject("total", total);//JSON视图mv.setView(new MappingJackson2JsonView());return mv;}/*var roleList = [{roleName: 'role_name_1', note: 'note_1'},{roleName: 'role_name_2', note: 'note_2'},{roleName: 'role_name_3', note: 'note_3'} ]; data: JSON.stringify(roleList), */@RequestMapping("/addRoles")public ModelAndView addRoles(@RequestBody List<Role> roleList) {ModelAndView mv = new ModelAndView();//新增角色int total = roleService.insertRoles(roleList);//绑定视图mv.addObject("total", total);//JSON视图mv.setView(new MappingJackson2JsonView());return mv;}/*序列化表单data: $("form").serialize(), */@RequestMapping("/commonParamPojo2")public ModelAndView commonParamPojo2(String roleName, String note) {System.out.println("roleName =>" + roleName);System.out.println("note =>" + note);ModelAndView mv = new ModelAndView();mv.setViewName("index");return mv;}

二、重定向

1.简单重定向

@RequestMapping("/showRoleJsonInfo")public ModelAndView showRoleJsonInfo(Long id, String roleName, String note) {    ModelAndView mv = new ModelAndView();    mv.setView(new MappingJackson2JsonView());    mv.addObject("id", id);    mv.addObject("roleName", roleName);    mv.addObject("note", note);    return mv;}/*    Model为重定向数据模型，Spring MVC会自动初始化它 */@RequestMapping("/addRole")public String addRole(Model model, String roleName, String note) {    Role role = new Role();    role.setRoleName(roleName);    role.setNote(note);    //插入角色后，会回填角色编号    roleService.insertRole(role);    //绑定重定向数据模型    model.addAttribute("roleName", roleName);    model.addAttribute("note", note);    model.addAttribute("id", role.getId());    return "redirect:./showRoleJsonInfo.do";}/*   通过ModelAndView实现重定向*/@RequestMapping("/addRole2")public ModelAndView addRole(ModelAndView mv, String roleName, String note) {    Role role = new Role();    role.setRoleName(roleName);    role.setNote(note);    //插入角色后，会回填角色编号    roleService.insertRole(role);    //绑定重定向数据模型    mv.addObject("roleName", roleName);    mv.addObject("note", note);    mv.addObject("id", role.getId());    mv.setViewName("redirect:./showRoleJsonInfo.do");    return mv;}

2.重定向传递POJO对象

    /*        重定向-通过POJO传递对象     */    @RequestMapping("/showRoleJsonInfo2")    public ModelAndView showRoleJsonInfo(Role role) {        ModelAndView mv = new ModelAndView();        mv.setView(new MappingJackson2JsonView());        mv.addObject("role", role);        return mv;    }    /*        重定向传递POJO            RedirectAttributes     */    @RequestMapping("/addRole3")    //RedirectAttribute对象Spring MVC会自动初始化它    public String addRole3(RedirectAttributes ra, Role role) {        //插入角色后，会回填角色编号        roleService.insertRole(role);        //绑定重定向数据模型        ra.addFlashAttribute("role", role);        return "redirect:./showRoleJsonInfo2.do";    }

三、保存并获取属性参数

1.注解@RequestAttribute

<html>    <body>       <%       //设置请求属性       request.setAttribute("id", 1L);       //转发给控制器       request.getRequestDispatcher("./attribute/requestAttribute.do").forward(request, response);       %>    </body></html>

@RequestMapping("/requestAttribute")public ModelAndView reqAttr(@RequestAttribute(name = "id", required = false) Long id){    ModelAndView mv = new ModelAndView();    Role role = roleService.getRole(id);    mv.addObject("role", role);    mv.setView(new MappingJackson2JsonView());    return mv;}

2.注解@SessionAttribute和注解@SessionAttributes

        @SessionAttributes只能对类进行标注，设置session属性

        @SessionAttribute获取session属性

@Controller@RequestMapping("/attribute")//可以配置数据模型的名称和类型，两者取或关系@SessionAttributes(names = "id", types = {Role.class})public class AttributeController {    @Autowired    private RoleService roleService;    @RequestMapping("/sessionAttributes")    public ModelAndView sessionAttrs(Long id) {        ModelAndView mv = new ModelAndView();        Role role = roleService.getRole(id);        //根据类型，session将会保存角色信息        mv.addObject("role", role);        //根据名称，session将会保存id        mv.addObject("id", id);        //视图名称，定义跳转到一个JSP文件上        mv.setViewName("sessionAttribute");        return mv;    }}

<html>    <body>        <%            Role role = (Role) session.getAttribute("role");            out.println("id = " + role.getId() + "<p/>");            out.println("roleName = " + role.getRoleName() + "<p/>");            out.println("note = " + role.getNote() + "<p/>");            Long id = (Long) session.getAttribute("id");            out.println("id = " + id + "<p/>");        %>    </body></html>

<html>    <body>        <%            //设置Session属性            session.setAttribute("id", 1L);            //执行跳转            response.sendRedirect("./attribute/sessionAttribute.do");        %>    </body></html>

@RequestMapping("/sessionAttribute")public ModelAndView sessionAttr(@SessionAttribute(name = "id", required = false) Long id) {    ModelAndView mv = new ModelAndView();    Role role = roleService.getRole(id);    mv.addObject("role", role);    mv.setView(new MappingJackson2JsonView());    return mv;}

3.注解@CookieValue和注解@RequestHeader

@RequestMapping("/getHeaderAndCookie")public String testHeaderAndCookie(        @RequestHeader(value = "User-Agent", required = false, defaultValue = "attribute") String userAgent,        @CookieValue(value = "JSESSIONID", required = true, defaultValue = "MyJsessionid") String jsessionId){    System.out.println("User-Agent：" + userAgent);    System.out.println("JSESSIONID：" + jsessionId);    return "index";}