Spring学习笔记<三> 获取请求对象和请求头

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1.效果图

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"%><!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>请求方式测试02</title></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"%><!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")@Controllerpublic 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

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