Spring学习笔记 获取请求对象和请求头
1.效果图
2.添加文件
在《 Spring学习笔记<二> 获取请求参数和Cookie》中，成功实现了获取请求参数和cookie的功能，这次在原有的项目基础上再添加三个文件：
test_restput.jsp文件（WebContent文件夹下面）：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>请求方式测试02title>
head>
<body>
<form action="springmvc/put02/testRequestPOJO" method="post">
username: <input type="text" name="username"><br>
password: <input type="password" name="password"><br>
email: <input type="text" name="email"><br>
age: <input type="text" name="age"><br>
city: <input type="text" name="address.city"><br>
province: <input type="text" name="address.province"><br>
<input type="submit" value="testRequestPOJO">
form>
<br />
<br />
<form action="springmvc/put02/testRequestHeader">
<input type="submit" value="testRequestHeader" />
form>
<br />
<br />
<form action="springmvc/put02/testRestModelView">
<input type="submit" value="testRestModelView" />
form>
<br />
<br />
body>
html>
success02.jsp文件（WEB-INF/views/文件夹下面）：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>成功界面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("用户信息为:" + 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执行成功");
return modelAndView;
}
}
3.spring mvc获取请求对象
之前获取到的都是简单的字符串，数字什么的请求参数，都仅仅是一个简单的字段，但是如果用户提交的是一个form表单，里面的内容和字段非常多呢？如果我们继续使用获取参数的方法去获取所有请求参数字段，会变得非常麻烦，那么，我们直接把这些请求字段封装成一个对象吧。
@RequestMapping(value="/testRequestPOJO", method=RequestMethod.POST)
public String testRequestPOJO(User user){
System.out.println("用户信息为:" + user);
return SUCCESS;
} 我们根据表单的具体字段建立两个javabean对象：
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 + "]";
}
}使用这种方法，我们就能够轻松把用户请求的表单数据转化成对象，就可以很方便的进行数据操作了。
4.spring mvc获取请求头的内容：@RequestHeader
@RequestMapping(value="/testRequestHeader")
public String testRequestHeader(@RequestHeader(value="Accept-Language") String language){
System.out.println("testRequestHeader Accept-Languge:" + language);
return SUCCESS;
}通过@RequestHeader，我们可以很方便的获取到请求头的具体内容,具体效果请看上面的效果图。
5.将信息写入请求头中，并通过响应视图展示出来：ModelAndView
@RequestMapping(value="/testRestModelView")
public ModelAndView testRestModelView(){
ModelAndView modelAndView = new ModelAndView(SUCCESS+"02");
modelAndView.addObject("time", new Date());
System.out.println("testRestModelView执行成功");
return modelAndView;
}这里将当前时间信息写进了请求域，并通过视图展示出来了，具体效果请看上面的效果图。
最后附上demo下载地址：戳我