SpringMVC——笔记

// @SessionAttributes(value={"user"},types={String.class})
@RequestMapping("/springmvc")
@Controller
public class SpringMVCTest {


private static final String SUCCESS = "success";

@ModelAttribute
public void getUser(@RequestParam(value="id",required= false) Integer id,Map map){
if(id != null){
// 模拟从数据库中获取对象
User user = new User(1,"Tom","123456","tom@atguigu.com",12);
System.out.println("从数据库中获取一个对象:"+ user);
map.put("user",user);
}

}
@RequestMapping("/testModelAttribute")
public String testModelAttribute(User user){
System.out.println("修改:" + user);
return SUCCESS;
}

/*注意这个注解只能放在类的上面，不能放在方法上面*/
@RequestMapping("/testSessionAttributes")
public String testSessionAttributes(Map map){

User user = new User(1,"tom@123.com",15);
map.put("user",user);
map.put("school","atguigu");
return SUCCESS;
}

/*
* 目标方法可以添加 Map 类型的(实际上也可以Model 类型的 或ModeMap 类型的)参数
* */
@RequestMapping("/testMap")
public String testMap(Map map){
System.out.println(map.getClass().getName());
map.put("names",Arrays.asList("Tom","Jerry","Mike"));
return SUCCESS;
}

/*
* 返回值可是ModelAndView 类型
* 其中可以包含视图和模型信息
* SpringMVC 会吧ModelAndView 的model 数据放到request 域中。
* */
@RequestMapping("/testModelAndView")
public ModelAndView testModelAndView(){
String viewName = SUCCESS;
ModelAndView modelAndView = new ModelAndView(viewName);
// 添加模型到ModelAndView 中
modelAndView.addObject("time",new Date());
return modelAndView;
}

@RequestMapping("/testServletAPI")
public String testServletAPI(HttpServletRequest request,HttpServletResponse response) {
System.out.println("testServletAPI,"+request+","+ response);
return SUCCESS;
}

/*
* Spring MVC 会按请求参数名和POJO 属性进行资助匹配
* 自动为该对象填充属性值，支持级联动，如 dept.deptId,dept.address.tel 等
* */
@RequestMapping("/testPojo")
public String testPojo(User user){
System.out.println("testPojo" + user);
return SUCCESS;
}

/*@CookieValue: 映射一个Cookie 值，属性同@RequestParam*/
@RequestMapping("/testCoookieValue")
public String testCoookieValue(@CookieValue("JSESSIONID")String sessionId){
System.out.println("CoookieValue:"+ sessionId);
return SUCCESS;

}

/*
* 映射请求头信息
* 用法同@RequestParam
* */
@RequestMapping("/testRequestHander")
public String testRequestHander(@RequestHeader(value="Accept-Language") String al){
System.out.println("testRequestHander,Accept-Language:"+ al);
return SUCCESS;
}

/*
* @RequestParam 来映射请求参数
* */
@RequestMapping(value="/testRequestParam")
public String testRequestParam(@RequestParam(value="username") String un,@RequestParam(value="age",required=false,defaultValue="0") int age){
System.out.println("testRequestParam,username:"+ un + age);
return SUCCESS;
}

/*
* Rest 风格的URL
* 以CRUD 为例：
* 新增： /order POST
* 修改： /order/1 PUT update?id=1
* 获取： /order/1 GET get?id=1
* 删除： /order/1 DELETE delete?id=1
*
* 如何发送PUT 请求和DELETE 请求呢？
* 1.需要配置 HiddenHttpMethodFilter
* 2.需要发送POST请求
* 3.需要在发送POST 请求时携带一个name="_method"值的隐藏域,值为 DELETE 或PUT
*
* */

@RequestMapping(value="/testRest/{id}",method=RequestMethod.PUT)
public String testRestPut(@PathVariable Integer id) {
System.out.println("testRest PUT:" + id );
return SUCCESS;
}

@RequestMapping(value="/testRest/{id}",method=RequestMethod.DELETE)
public String testRestDelete(@PathVariable Integer id) {
System.out.println("testRest DELETE:" + id );
return SUCCESS;
}

@RequestMapping(value="/testRest",method=RequestMethod.POST)
public String testRest() {
System.out.println("testRest POST" );
return SUCCESS;
}

@RequestMapping(value="/testRest/{id}",method=RequestMethod.GET)
public String testRest(@PathVariable Integer id) {
System.out.println("testRest GET:" + id );
return SUCCESS;
}



/*
* @PathVariable 可以来映射URL 中的站位符到目标方法的参数中
*
* */
@RequestMapping("testPathVariable/{id}")
public String testPathVariable(@PathVariable("id") Integer id) {
System.out.println("testPathVariable:" + id);
return SUCCESS;
}

@RequestMapping("testAntPath/*/abc")
public String testAntPath() {
System.out.println("testAntPath");
return SUCCESS;
}

/*
* 了解： 可以使用 params 和headers 来更加精确的映射请求，params 和headers 支持简单的表达式，
* */

@RequestMapping(value="testParamsAndHeaders",params={"username","age!=10"},headers={"Accept-Language=en-US,zh;q=0.8"})
public String testParamsAndHeaders(){
System.out.println("testParamsAndHeaders");
return SUCCESS;
}

/*
*
* 使用method 属性来指定请求方式
*
*
* */
@RequestMapping(value="/testMethod",method=RequestMethod.POST)
public String testMethod() {
System.out.println("testMethod");
return SUCCESS;
}

/*
*
*1. @RequestMapping 除了修饰方法还可以修饰类
*2.
*
* */


@RequestMapping("/testRequestMapping")
public String testRequestMapping(){
System.out.println("testRequestMapping");
return SUCCESS;
}
}