Spring學習筆記 獲取請求物件和請求頭
阿新 • • 發佈：2019-02-10
1.效果圖
2.新增檔案
在《 Spring學習筆記<二> 獲取請求引數和Cookie》中，成功實現了獲取請求引數和cookie的功能，這次在原有的專案基礎上再新增三個檔案：
test_restput.jsp檔案（WebContent資料夾下面）：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> success02.jsp檔案（WEB-INF/views/資料夾下面）：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>成功介面</title>
</head>
<body>
time: ${requestScope.time}<br><br>
<h4>恭喜您成功了</h4>
</body>
</html>
testRestPut02.Java（在com.shi.springmvc.handlers包下面）
package com.shi.springmvc.handlers;
import java.util.Date;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
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.servlet.ModelAndView;
@RequestMapping("/springmvc/put02")
@Controller
public class TestRestPut02 {
private String SUCCESS = "success";
@RequestMapping(value="/testRequestPOJO", method=RequestMethod.POST)
public String testRequestPOJO(User user){
System.out.println("使用者資訊為:" + user);
return SUCCESS;
}
@RequestMapping(value="/testRequestHeader")
public String testRequestHeader(@RequestHeader(value="Accept-Language") String language){
System.out.println("testRequestHeader Accept-Languge:" + language);
return SUCCESS;
}
@RequestMapping(value="/testRestModelView")
public ModelAndView testRestModelView(){
ModelAndView modelAndView = new ModelAndView(SUCCESS+"02");
modelAndView.addObject("time", new Date());
System.out.println("testRestModelView執行成功");
return modelAndView;
}
}
3.spring mvc獲取請求物件
之前獲取到的都是簡單的字串，數字什麼的請求引數，都僅僅是一個簡單的欄位，但是如果使用者提交的是一個form表單，裡面的內容和欄位非常多呢？如果我們繼續使用獲取引數的方法去獲取所有請求引數欄位，會變得非常麻煩，那麼，我們直接把這些請求欄位封裝成一個物件吧。
@RequestMapping(value="/testRequestPOJO", method=RequestMethod.POST)
public String testRequestPOJO(User user){
System.out.println("使用者資訊為:" + user);
return SUCCESS;
} 我們根據表單的具體欄位建立兩個javabean物件：
public class User {
private Integer id;
private String username;
private String password;
private String email;
private int age;
private Address address;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password=" + password + ", email=" + email + ", age="
+ age + ", address=" + address + "]";
}
}public class Address {
private String province;
private String city;
public String getProvince() {
return province;
}
public void setProvince(String province) {
this.province = province;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
@Override
public String toString() {
return "Address [province=" + province + ", city=" + city + "]";
}
}使用這種方法，我們就能夠輕鬆把使用者請求的表單資料轉化成物件，就可以很方便的進行資料操作了。
4.spring mvc獲取請求頭的內容：@RequestHeader
@RequestMapping(value="/testRequestHeader")
public String testRequestHeader(@RequestHeader(value="Accept-Language") String language){
System.out.println("testRequestHeader Accept-Languge:" + language);
return SUCCESS;
}通過@RequestHeader，我們可以很方便的獲取到請求頭的具體內容,具體效果請看上面的效果圖。
5.將資訊寫入請求頭中，並通過響應檢視展示出來：ModelAndView
@RequestMapping(value="/testRestModelView")
public ModelAndView testRestModelView(){
ModelAndView modelAndView = new ModelAndView(SUCCESS+"02");
modelAndView.addObject("time", new Date());
System.out.println("testRestModelView執行成功");
return modelAndView;
}這裡將當前時間資訊寫進了請求域，並通過檢視展示出來了，具體效果請看上面的效果圖。
最後附上demo下載地址：戳我