在SpringMVC的註解開發中,能夠選擇性的接收Request和Response對象來使用html
經過request對象獲取請求參數時,類型不一致時須要手動轉換。int age = Integer.parseInt(request.getParameter("age"));java
/** * 獲取request 和 response */ @RequestMapping("/hello3.action") public String hello3(HttpServletRequest request, HttpServletResponse response, Model model){ String username = request.getParameter("username"); int age = Integer.parseInt(request.getParameter("age")); // 獲取某個請求頭信息 String al = request.getHeader("Accept-Language"); System.out.println(al); System.out.println(username + "~~" + age); model.addAttribute("msg","hello springmvc~"); return "hello"; }
訪問:http://localhost/SpringMVC2/hello3.action?username=cjj&age=18web
能夠在Controller方法中直接接收請求參數相同否定方法形參,能夠直接獲得請求參數的值。spring
WebRoot目錄下建立一個from表單數組
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <form action="${pageContext.request.contextPath}/hello4.action" method="POST"> <table> <tr> <td>用戶名</td> <td><input type="text" name="username"/></td> </tr> <tr> <td>密碼</td> <td><input type="text" name="password"/></td> </tr> <tr> <td>年齡</td> <td><input type="text" name="age"/></td> </tr> <tr> <td colspan="2"><input type="submit" value="提交"/></td> </tr> </table> </form> </body> </html>
/**
* 快速得到請求參數
*/
@RequestMapping("/hello4.action")
public String hello4(String username, String password, int age, Model model){
System.out.println(username+"--"+password+"--"+age);
model.addAttribute("msg", "hello springmvc ~~");
return "hello";
}
訪問:http://localhost/SpringMVC2/from.jsptomcat
點擊提交,跳轉到:http://localhost/SpringMVC2/hello4.actionmvc
控制檯輸出:app
SpringMVC框架能夠自動將請求參數封裝到bean中,要求bean中必須提供屬性的setXxx方法,且bean的屬性名和請求參數的名字必須一致,才能夠自動設置。框架
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <form action="${pageContext.request.contextPath}/hello5.action" method="POST"> <table> <tr> <td>用戶名</td> <td><input type="text" name="username"/></td> </tr> <tr> <td>密碼</td> <td><input type="text" name="password"/></td> </tr> <tr> <td>年齡</td> <td><input type="text" name="age"/></td> </tr> <tr> <td colspan="2"><input type="submit" value="提交"/></td> </tr> </table> </form> </body> </html>
package cn.tedu.springmvc.beans; public class User { private String username; private String password; private int age; 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 int getAge() { return age; } public void setAge(int age) { this.age = age; } }
/** * 封裝請求參數到bean */ @RequestMapping("/hello5.action") public String hello5(User user, Model model){ System.out.println(user); model.addAttribute("msg", "hello springmvc~~"); return "hello"; }
訪問:http://localhost/SpringMVC2/from.jspjsp
頁面跳轉:http://localhost/SpringMVC2/hello5.action
控制檯輸出:
若是自動封裝的bean中存在複雜類型,只要該複雜類型的屬性一樣具備setXxx方法,
則能夠在請求參數中包含[bean中複雜類型].[屬性]的方法爲該複雜類型的參數複製,
從而實現自動封裝bean的過程當中處理其中複雜類型。
package cn.tedu.springmvc.beans; public class User { private String username; private String password; private int age; private Dog dog; public Dog getDog() { return dog; } public void setDog(Dog dog) { this.dog = dog; } 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 int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "User [username=" + username + ", password=" + password + ", age=" + age + ", dog=" + dog + "]"; } }
package cn.tedu.springmvc.beans; public class Dog { private String name; private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "Dog [name=" + name + ", age=" + age + "]"; } }
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <form action="${pageContext.request.contextPath}/hello5.action" method="POST"> <table> <tr> <td>用戶名</td> <td><input type="text" name="dog.name"/></td> </tr> <tr> <td>年齡</td> <td><input type="text" name="dog.age"/></td> </tr> <tr> <td colspan="2"><input type="submit" value="提交"/></td> </tr> </table> </form> </body> </html>
/** * 封裝請求參數到bean */ @RequestMapping("/hello5.action") public String hello5(User user, Model model){ System.out.println(user); model.addAttribute("msg", "hello springmvc~~"); return "hello"; }
能夠經過@RequestParam來修飾Controller方法中用來接收請求參數的形參,
有以下屬性能夠配置:
value來指定將哪一個請求參數複製給當前形參
將required聲明爲true,則請求參數中必須有該屬性,若是沒有客戶端將收到400
defaultValue能夠設定當前形參的默認值
public String hello5(User user, @RequestParam(value="hobby",required=true)String[] hobbys, Model model){
若是請求參數中存在多個同名值
此時直接獲取,會獲得一個用逗號分隔的字符串
/** * 接收同名的多值請求參數 */ @RequestMapping("/hello6") public String hello6(String like,Model model){ System.out.println(like); model.addAttribute("msg", "hello springmvc~~"); return "hello"; }
訪問
控制檯輸出:
也能夠修改Controller方法的形參爲數據類型,則直接接收到一個數組
/** * 接收同名的多值請求參數 */ @RequestMapping("/hello6") public String hello6(String[] like,Model model){ System.out.println(Arrays.toString(like)); model.addAttribute("msg", "hello springmvc~~"); return "hello"; }
訪問
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SpringMVC提供了過濾器用來解決全站亂碼
<!-- 配置SpringMVC亂碼解決過濾器 --> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
這種方式只能解決POST提交的亂碼,對GET方式提交的亂碼無效!
此時只能手動進行編解碼,解決GET方式請求參數亂碼
也能夠直接修改Tomcat中連接器的配置來使tomcat默認採用指定編碼處理請求參數
可是這種方式不建議你們使用,由於生產環境下不必定容許修改此項。
在SpringMVC中解析頁面提交的參數時,日期默認格式是yyyy/MM/dd,並不符合中國人日常的使用習慣,
此時能夠配置適配器本身來指定格式
/** * 日期格式處理 * @throws UnsupportedEncodingException */ @RequestMapping("/hello8.action") public String hello8(Date birthday,Model model) throws UnsupportedEncodingException{ System.out.println(birthday); model.addAttribute("msg", "hello springMvc4,hello World4~"); return "hello"; } public void InitBinder(ServletRequestDataBinder binder){ binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),true)); }
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <form action="${pageContext.request.contextPath}/hello8.action" method="POST"> <table> <tr> <td>用戶名</td> <td><input type="text" name="username"/></td> </tr> <tr> <td>年齡</td> <td><input type="text" name="age"/></td> </tr> <tr> <td>狗名</td> <td><input type="text" name="dog.name"/></td> </tr> <tr> <td>狗齡</td> <td><input type="text" name="dog.age"/></td> </tr> <tr> <td>出生日期</td> <td><input type="text" name="birthday"/></td> </tr> <tr> <td>愛好</td> <td> <input type="checkbox" name="like" value="zq"/>足球 <input type="checkbox" name="like" value="lq"/>籃球 <input type="checkbox" name="like" value="pq"/>排球 <input type="checkbox" name="like" value="qq"/>鉛球 </td> </tr> <tr> <td colspan="2"><input type="submit" value="提交"/></td> </tr> </table> </form> </body> </html>
訪問
控制檯輸出:
文件上傳表單必須知足以下三個條件
a)表單必須是POST提交的
b)表單必須是enctype=「multipart/form-data」
c)文件上傳必須有name屬性
/** * 文件上傳 * @throws IOException */ @RequestMapping("/hello9.action") public String hello9(MultipartFile fx, Model model) throws IOException{ System.out.println(fx.getOriginalFilename()); FileUtils.writeByteArrayToFile(new File("E://"+fx.getOriginalFilename()), fx.getBytes()); model.addAttribute("msg", "hello springmvc ~~"); return "hello"; }
普通get請求:
RESTFul風格的請求:
/** * RESTFul支持 */ @RequestMapping("/hello10/{username}/{age}.action") public String hello10(@PathVariable String username, @PathVariable int age, Model model){ System.out.println(username+"~"+age); model.addAttribute("msg", "hello springmvc~~"); return "hello"; }
訪問
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