Java-springMVC框架:springMVC取参数值、把值放入作用域方法

「爱情、让人受尽委屈。」 2022-07-11 04:23 99阅读 0赞

package com.zp.upload;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.regex.Pattern;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    import org.apache.struts2.json.JSONException;
    import org.apache.struts2.json.JSONUtil;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.ModelMap;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.SessionAttributes;
    import org.springframework.web.bind.support.SessionStatus;
    import org.springframework.web.servlet.ModelAndView;
    
    import com.zp.bean.User;
    
    @Controller
    @RequestMapping("model")
    @SessionAttributes("sessionUser")
    public class ModelMapController {
    
    	/***********************************参数获取的方式**********************************************/
    	//http://localhost:8080/zpupload/model/index1/3/fyl.html
    	@RequestMapping("/index1/{id}/{name}")
    	public String index1(@PathVariable("id") Integer id,@PathVariable("name") String username) {
    		System.out.println("参数一：id="+id+",参数二：username="+username);
    		//结果为：参数一：id=3,参数二：username=fyl
    		return "model/index1";
    	}
    	
    	//http://localhost:8080/zpupload/model/index2.html?id=56&name=mm
    	@ResponseBody
    	@RequestMapping("/index2")
    	public String index2(Integer id,String name) {
    		System.out.println("参数一：id="+id+",参数二：name="+name);
    		//结果：参数一：id=56,参数二：name=mm
    		return "index2";
    	}
    	
    	//http://localhost:8080/zpupload/model/index3.html?username=mm&age=17&address=北京
    	@ResponseBody
    	@RequestMapping("/index3")
    	//参数名要和User 类属性名一致，属性也要相同（例如Integer不能穿String类型的值）
    	public String index3(User user) {
    		System.out.println("username="+user.getUsername()+";age="+user.getAge()+";address="+user.getAddress());
    		//结果：username=mm;age=17;address=北京
    		return "index3";
    	}
    	
    	//http://localhost:8080/zpupload/model/index4.html?name=fyl
    	@ResponseBody
    	@RequestMapping("/index4")
    	public String index4(HttpServletRequest request) {
    		System.out.println(request.getParameter("name"));
    		//结果：fyl
    		return "index4";
    	}
    	
    	/**************作用域的问题   reuqest session application ************/
    	/**************作用域的范围：request*******/
    	/**
    	 * index5.jsp EL表达式返回值
    		<h1>1111 ${message }</h1>
    		<h1>2222 ${user.username }</h1>
    		<h1>3333 ${user.age }</h1>
    		<h1>4444 ${sessionMessage }</h1>
    		<h1>5555 ${sessionUser.username }</h1>
    		<h1>6666 ${sessionUser.age }</h1>
    	 */
    	@RequestMapping("/index5")
    	public String index5(HttpServletRequest request) {
    		request.setAttribute("message", "request作用域-HttpServletRequest-index5");
    		return "model/index5";
    	}
    	
    	@RequestMapping("/index6")
    	public String index6(ModelMap map) {
    		map.addAttribute("message", "request作用域-ModelMap-index6");
    		return "model/index5";
    	}
    	
    	@RequestMapping("/index7")
    	public ModelAndView index7() {
    		//视图和作用域融合体
    		ModelAndView modelAndView = new ModelAndView();
    		modelAndView.setViewName("model/index5");
    		modelAndView.addObject("message", "request作用域-ModelAndView-index7");
    		return modelAndView;
    	}
    	
    	//@ModelAttribute 需要传递对象
    	@RequestMapping("/index8")
    	public String index8(@ModelAttribute("user") User user) {
    		user.setUsername("request作用域-@ModelAttribute-index8");
    		user.setAge(18);
    		return "model/index5";
    	}
    	
    	/**************以流的方式返回数据 *******/
    	@ResponseBody
    	@RequestMapping("/data1")
    	public String data1(User user) throws JSONException {
    		user.setUsername("MM");
    		user.setAddress("北京");
    		List<Pattern> patterns = new ArrayList<>();
    		patterns.add(Pattern.compile("age|address"));
    		//不显示key为"age|address"，不显示null，以JSON方式返回      {"username":"MM"}
    		return JSONUtil.serialize(user, patterns, null, false, true, false);
    	}
    	
    	@RequestMapping("/data2")
    	public void data2(HttpServletResponse response) throws IOException, JSONException {
    //		response.setCharacterEncoding("UTF-8");
    		response.setContentType("application/json;charset=utf-8");
    		User user = new User();
    		user.setUsername("ff");
    		user.setAge(18);
    		user.setAddress("海淀区");
    		PrintWriter writer = response.getWriter();
    		writer.println(JSONUtil.serialize(user));
    		writer.flush();
    		writer.close();
    	}
    	
    	/**************作用域的范围：session*******/
    	@RequestMapping("/index9")
    	public String index9(HttpServletRequest request) {
    		//放入session域后，其他请求也会取到sessionMessage 值
    		request.getSession().setAttribute("sessionMessage", "session作用域-@-index9");
    //		request.setAttribute("sessionMession", "session作用域-@-index9");
    		return "model/index5";
    	}
    	
    	
    	/*的时候,方法的@ModelAttribute先调用 会调用一个指明：@ModelAttribute隐式的对象创建，
    	 * 第一步
    	 * 如果@SessionAttributes没有sessionUser属性
    	 * 带@ModelAttribute方法先执行，
    	 	@ModelAttribute("sessionUser")
    		public User getUser() {
    			return new User();
    		}
    		上面代码及：User user = new User(); 
    	        对象创建成功以后在赋给 @SessionAttributes
    		session.setAttribute("sessionUser",user);
    	* 第二步（index10）
    	  @ModelAttribute("sessionUser") User user
    		User user = (User)session.getAttribute("sessionUser");
    		user.setAge(17);
    	 * */
    	@RequestMapping("/index10")
    	public String index10(@ModelAttribute("sessionUser") User user) {
    		user.setUsername("session作用域-@ModelAttribute-index10");
    		user.setAge(17);
    		return "model/index5";
    	}
    	
    	//@ModelAttribute隐式的对象
    	@ModelAttribute("sessionUser")
    	public User getUser() {
    		return new User();
    	}
    	
    	/**************注销session*******/
    	@RequestMapping("/logout")
    	public String logout(HttpSession session) {
    		session.invalidate();//清除所有的会话
    //		session.removeAttribute("user");
    		return "model/index5";
    	}
    	
    	@RequestMapping("logout2")
    	public String logout2(SessionStatus sessionStatus) {
    		sessionStatus.setComplete();
    		return "model/index5";
    	}
    	
    	/*application的获取*/
    	
    //	@RequestMapping("/application")
    //	public String application(ServletContext context){
    //		System.out.println(context);
    //		return "ok";
    //	}
    	
    //	@RequestMapping("/application")
    //	public String application(HttpServletRequest request){
    //		request.getServletContext();
    //		return "ok";
    //	}
    	
    }