Disclaimer: This article is a blogger original article, follow the CC 4.0 BY-SA copyright agreement, reproduced, please attach the original source link and this statement.
SpringMVC jump back Daquan summary
SpringMVC access parameters and parameter passing There are many ways in the development process will inevitably forget some ways,
A long time do not use, you can copy the code to take any time to view a Demo next project, White Starter necessary! ! !
Common way: the request parameter name in a parameter Controller Method
@ModelAttribute("/getName")
public ModelAndView getName(String username, String password, Integer age) {
//ModelAndView mav = new ModelAndView("redirect:/index.jsp");
ModelAndView mv = new ModelAndView();
mv.setViewName("index.jsp");
Map<String, Object> map = new HashMap<String, Object>();
map.put("username", username);
map.put("password", password);
map.put("age", age);
mv.addObject("map", map);
return mv;
}Way: shape parameter receiving process parameter page
@RequestMapping("/login1")
public String login1(User user,String[] str,Model model){
user.getId();
model.addAttribute("user", user);
model.addAttribute("str", str);
return "";
}Second way: by binding the page came @RequestParam parameters, and the same effect request.getParameter
@RequestMapping("/login2")
public String login2(@RequestParam("username") String username,
@RequestParam("password") String password,
Model model){
if (username.equals(password)){
model.addAttribute("username", username);
return "ok.jsp";
} else {
return "no.jsp";
}
}Three ways: on the parameter after adding @RequestBody annotation may receive data transmitted from the front end of the format json
@RequestMapping("/test1")
@ResponseBody
public String test(@RequestBody String[] arr){
for(String a:arr){
System.out.println(a);
}
return "index.jsp";
} Four ways: on the parameter after adding @RequestBody annotation may receive data transmitted from the front end of the format json
@RequestMapping("/test2")
@ResponseBody
public void test(@RequestBody List<User> list){
for (User user:list){
System.out.println(user);
}
}Way five: argument uses a path variable @PathVariable Binding page url path, the placeholder parameters in the URL passed to the method parameter variables
@RequestMapping("/goUrl/{folder}/{file}")
public String goUrl(@PathVariable String folder,@PathVariable String file){
return folder+"/"+file;
}Six ways: using the native Servlet API methods as parameters Controller
@RequestMapping("/user/login")
public ModelAndView userLogin3(@RequestParam HashMap<String, Object> param,
HttpSession session,HttpServletRequest request,HttpServletResponse response) {
ModelAndView mv = new ModelAndView();
HashMap<String, Object> loginUser = param;
if(loginUser == null) {
mv.addObject("msg", "账号不能为空!");
mv.setViewName("index");
} else {
session.setAttribute("loginUser", loginUser);
mv.addObject("msg", "登陆成功!");
mv.setViewName("user/index.jsp");
}
return mv;
}Seven ways: @ModelAttribute used on function parameters, in the end you can go to a page by page spread HttpServletRequest
@RequestMapping(value = "/recive", method = RequestMethod.GET)
public ModelAndView StartPage3(@ModelAttribute("user") User user) {
user.setId(1);
return new ModelAndView("xxx");
}Form 8: Using Map, Model and ModelMap way
@RequestMapping("/test")
public String test(Map<String,Object> map,Model model,ModelMap modelMap,HttpServletRequest request){
//1.放在map里
map.put("names", Arrays.asList("李白","小白","小黑"));
//2.放在model里 建议使用
model.addAttribute("time", new Date());
//3.放在request里
request.setAttribute("request", "requestValue");
//4.放在modelMap中
modelMap.addAttribute("city", "北京");
modelMap.put("gender", "male");
return "hello";
// 页面获取
// names:${requestScope.names }
// time:${requestScope.time}
// city:${requestScope.city }
// request:${requestScope.request}
// gender:${requestScope.gender }
}
All the code: SpringMVCDemo .java
package com.gxwz.web;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
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.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.gxwz.entity.User;
@Controller
public class SpringMVCDemo {
private String result; //定义跳转链接
// 最常用的方式：将请求参数名作为Controller中方法的形参
@ModelAttribute("/getName")
public ModelAndView getName(String username, String password, Integer age) {
//ModelAndView mav = new ModelAndView("redirect:/index.jsp");
ModelAndView mv = new ModelAndView();
mv.setViewName("index.jsp");
Map<String, Object> map = new HashMap<String, Object>();
map.put("username", username);
map.put("password", password);
map.put("age", age);
mv.addObject("map", map);
return mv;
}
// 方式一：方法的形参接收页面参数
@RequestMapping("/login1")
public String login1(User user,String[] str,Model model){
user.getId();
model.addAttribute("user", user);
model.addAttribute("str", str);
return "";
}
// 方式二： 通过@RequestParam绑定页面传来的参数，和request.getParameter效果一样
@RequestMapping("/login2")
public String login2(@RequestParam("username") String username,
@RequestParam("password") String password,
Model model){
if (username.equals(password)){
model.addAttribute("username", username);
return "ok.jsp";
} else {
return "no.jsp";
}
}
// 方式三：在参数上加上@RequestBody注解后就可以接收到前端传来的json格式的数据
@RequestMapping("/test1")
@ResponseBody
public String test(@RequestBody String[] arr){
for(String a:arr){
System.out.println(a);
}
return "";
}
// 方式四：在参数上加上@RequestBody注解后就可以接收到前端传来的json格式的数据
@RequestMapping("/test2")
@ResponseBody
public void test(@RequestBody List<User> list){
for (User user:list){
System.out.println(user);
}
}
// 方式五：使用路径变量@PathVariable绑定页面url路径的参数，将URL中的占位符参数传入到方法参数变量中
@RequestMapping("/goUrl/{folder}/{file}")
public String goUrl(@PathVariable String folder,@PathVariable String file){
return folder+"/"+file;
}
// 方式六：使用原生的Servlet API 作为Controller 方法的参数
@RequestMapping("/user/login")
public ModelAndView userLogin3(@RequestParam HashMap<String, Object> param,
HttpSession session,HttpServletRequest request,HttpServletResponse response) {
ModelAndView mv = new ModelAndView();
HashMap<String, Object> loginUser = param;
if(loginUser == null) {
mv.addObject("msg", "账号不能为空!");
mv.setViewName("index");
} else {
session.setAttribute("loginUser", loginUser);
mv.addObject("msg", "登陆成功!");
mv.setViewName("user/index.jsp");
}
return mv;
}
// 方式七：@ModelAttribute在函数参数上使用，在页面端可以通过HttpServletRequest传到页面中去
@RequestMapping(value = "/recive", method = RequestMethod.GET)
public ModelAndView StartPage3(@ModelAttribute("user") User user) {
user.setId(1);
return new ModelAndView("xxx");
}
// 方式八：使用Map、Model和ModelMap的方式
@RequestMapping("/test")
public String test(Map<String,Object> map,Model model,ModelMap modelMap,HttpServletRequest request){
//1.放在map里
map.put("names", Arrays.asList("李白","小白","小黑"));
//2.放在model里 建议使用
model.addAttribute("time", new Date());
//3.放在request里
request.setAttribute("request", "requestValue");
//4.放在modelMap中
modelMap.addAttribute("city", "北京");
modelMap.put("gender", "male");
return "hello";
// 页面获取
// names:${requestScope.names }
// time:${requestScope.time}
// city:${requestScope.city }
// request:${requestScope.request}
// gender:${requestScope.gender }
}
}
SpringMVC access parameters and parameter passing There are many ways in the development process will inevitably forget some ways,
A long time do not use, you can copy the code to take any time to view a Demo next project, White Starter necessary! ! !