第八章 SpringMVC進階
阿新 • • 發佈：2018-12-12
檢視解析器
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd "> <!-- 配置檢視解析器: 檢視解析器將返回的跳轉的頁面路徑進行加工 --> <!-- 檢視解析器的作用是隻對Controller類中每個函式返回值那裡的String型別前後加路徑 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property> <!-- 字首和字尾 --> <property name="prefix" value="/"></property> <property name="suffix" value=".jsp"></property> </bean> <context:component-scan base-package="com.controller"></context:component-scan> </beans>
package com.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller @RequestMapping("/test") public class TestResolver { @RequestMapping("/test.do") public String test(){ System.out.println("檢視解析器準備執行中........."); // SpringMVC.xml配置檢視解析器;檢視解析器會自動為返回的頁面路徑新增字首和字尾 return "index"; } }
SpringMVC對引數的獲取
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>index</title> </head> <body> <form action="test/test.do" method="post"> 帳號 : <input type="text" name="username" /><br/><br/> 密碼 : <input type="password" name="password" /><br/><br/> <input type="submit" /> </form> </body> </html>
Servlet獲取引數
package com.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/*
* 獲取引數
*/
@Controller
@RequestMapping("/test")
public class TestResolver {
@RequestMapping("/test.do")
public String test(HttpServletRequest request,HttpServletResponse reponse){
// Servlet獲取引數
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("帳號:"+username);
System.out.println("密碼:"+password);
return "ok";
}
}
SpringMVC多形參獲取引數
package com.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/*
* 獲取引數
*/
@Controller
@RequestMapping("/test")
public class TestResolver {
@RequestMapping("/test.do")
public String test(String username,String password){
// SpringMVC多引數獲取,形參名必須與頁面name值相同
System.out.println("帳號:"+username);
System.out.println("密碼:"+password);
return "ok";
}
}
SpringMVC封裝物件獲取引數
package com.model;
/*
* 使用者封裝實體類
*/
public class User {
private String username;
private String password;
public User() {
super();
}
public User(String username, String password) {
super();
this.username = username;
this.password = password;
}
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;
}
}
package com.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.model.User;
/*
* 獲取引數
*/
@Controller
@RequestMapping("/test")
public class TestResolver {
@RequestMapping("/test.do")
public String test(User user){
// SpringMVC封裝物件獲取引數
System.out.println("帳號:"+user.getUsername());
System.out.println("密碼:"+user.getPassword());
return "ok";
}
}
SpringMVC指定引數獲取
package com.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
/*
* 獲取引數
*/
@Controller
@RequestMapping("/test")
public class TestResolver {
@RequestMapping("/test.do")
// @RequestParam註解設定指定引數(不可變),形參名可變
// 指定引數獲取,引數名必須與頁面name值對應,否則會報錯;其他方式不會報錯,會返回null
public String test(@RequestParam("username")String name,@RequestParam("password")String pwd){
// SpringMVC註解指定引數獲取
System.out.println("帳號:"+name);
System.out.println("密碼:"+pwd);
return "ok";
}
}
ModelAndView
package com.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
/*
* ModelAndView:新增資料和設定跳轉的頁面
*/
@Controller
@RequestMapping("/test")
public class TestResolver {
@RequestMapping("/test.do")
public ModelAndView test(String username,String password){
// 建立模型檢視
ModelAndView mav = new ModelAndView();
// 新增模型資料:可以在頁面通過key獲取value的值
mav.addObject("username", username);
mav.addObject("password", password);
// 設定檢視:頁面會根據此進行跳轉
mav.setViewName("ok");
// 返回檢視模型
return mav;
}
}
SpringMVC寫出JSON
package com.controller;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
/*
* ModelAndView
*/
@Controller
@RequestMapping("/test")
public class TestResolver {
@RequestMapping("/test.do")
// 返回JSON字串
// 在方法返回型別前面新增@ResponseBody註解或在方法上面添加註解;宣告返回的是json
public @ResponseBody void test(HttpServletResponse response) throws IOException{
// 獲取響應輸出流
PrintWriter out = response.getWriter();
// json字串
String json="[{'name':'Micro','age',18},{'name':'Myth','age':23}]";
// 寫出json字串
out.write(json);
}
}