spring mvc 小结-51cto学院Spring MVC

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一.Spring MVC 基础

Spring mvc 框架是一个MVC框架，通过实现MVC很好地将数据、业务、展现进行分离,其底层仍然是servlet
要在web.xml 中配置servlet

Spring MVC 的设计围绕DispatcherServlet 展开的，
由DispatcherServlet负责将请求派发到特定的handler->controller->modelandview-> vierresolve->view

一定要创建web.xml 文件

spring mvc 框架搭建步骤：
1.创建工程，拷贝spring mvc相关的jar包到lib
2.配置 web.xml，配置前端控制器，DispacherServlet

<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

3.在web-inf 下创建一个spring mvc 的配置文件，文件的命名规则为：[servletname]-servlet.xml
springmvc-servlet.xml

4.配置handlerMapping:根据bean name 来查找对应的Controller(这步可以省略)
<bean class = "org.springframework.web.servlet.mvc.support.ControllerBeanNameHandlerMapping" ></bean>

5.创建jsp页面：需要发出请求的页面

6.创建HelloController,继承org.springframework.web.servlet.mvc.AbstractController，
重写handleRequestInternal。
//返回数据和页面
ModelAndView mav = new ModelAndView("index"); //返回的页面
mav.addObject("helloworld","hello: " + hello);

7.配置视图解析器

<bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">

<property name="prefix" value = "/view/" ></property>

<property name="suffix" value = ".jsp"></property>
</bean>

二.HandlerMapping 的三种方式

<bean class = "org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"></bean>
<bean class = "com.springmvc.controller.UserController"></bean>


<bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">

<property name="prefix" value = "/" ></property>

<property name="suffix" value = ".jsp"></property>
</bean>

jsp 页面：
<a href = "user.do">根据bean name 访问controller</a><br/>
<a href = "userInfo.do">根据url 访问controller</a><br/>
<a href = "userController.do">根据 Controller 类名访问controller</a><br/>

三.参数传递

请求参数传递：
1.通过设置HTtpServletRequest request，HttpSession,HttpServletResponse 来获取数据
<form action = "user/add.do" method = "get">
账号：<input type = "text" name = "userName"/><br/>
密码：<input type = "password" name = "userPwd"/><br/>
<input type = "submit" value = "提交"/>
</form>

/**
* 传递参数的方法一
* @param request
* @return
*
@RequestMapping(value = "/add.do",method = RequestMethod.GET)
//HttpSession
public String add(HttpServletRequest request){
String userName = request.getParameter("userName");
String userPwd = request.getParameter("userPwd");

System.out.println("用户信息 :用户名" + userName + ", 密码:" +userPwd);
return "userinfo/user_add";
}

2.直接设置参数，例如：
public String add(@RequestParam(value = "userName",defaultValue = "sa")String name,Integer userPwd)

<form action = "user/add.do" method = "get">
账号：<input type = "text" name = "userName"/><br/>
密码：<input type = "password" name = "userPwd"/><br/>
<input type = "submit" value = "提交"/>
</form>

/**
* 传递参数的方法二
* @return

@RequestMapping(value = "/add.do",method = RequestMethod.GET)
//数据多时，可以通过传递对象的方式来传递参数
public String add(String userName,String userPwd){
System.out.println("用户信息 :用户名" + userName + ", 密码:" +userPwd);
return "userinfo/user_add";
}
*/

/**
* 传递参数的方法二
* @RequestParam 给参数取别名
* @return

@RequestMapping(value = "/add.do",method = RequestMethod.GET)
//数据多时，可以通过传递对象的方式来传递参数
//Integer userPwd 会有类型转换的操作
public String add(@RequestParam(value = "userName",defaultValue = "sa")String name,Integer userPwd){
System.out.println("用户信息 :用户名" + name + ", 密码:" +userPwd);
return "userinfo/user_add";
}
*/

3.通过对象
表单的name属性的值必须和类的属性名称一直

/**
* 传递参数的方法三
* @param user
* @return
*/
@RequestMapping(value = "/add3.do",method = RequestMethod.GET)
public String add(UserInfo user){
System.out.println(user.toString());
return "userinfo/user_add";
}

package com.hl.po;

import java.util.Arrays;

public class UserInfo {
private Integer userId;
private String userName;
private String userSex;
private String [] userXq;

public String[] getUserXq() {
return userXq;
}
public void setUserXq(String[] userXq) {
this.userXq = userXq;
}
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserSex() {
return userSex;
}
public void setUserSex(String userSex) {
this.userSex = userSex;
}
@Override
public String toString() {
return "UserInfo [userId=" + userId + ", userName=" + userName
+ ", userSex=" + userSex + ", userXq="
+ Arrays.toString(userXq) + "]";
}

}


<form action = "user/add3.do" method = "get">





编号：<input type = "text" name = "userId"/><br/>
姓名：<input type = "password" name = "userName"/><br/>
性别：<input type = "text" name = "userSex"/><br/>
兴趣爱好：
<input type = "checkbox" name = "userXq" value = "LOL">LOL
<input type = "checkbox" name = "userXq" value = "yingxiong">yingxiong
<input type = "checkbox" name = "userXq" value = "cs">cs
<input type = "submit" value = "提交"/>

</form>

4.类型转换

<form action = "user/add4.do" method = "get">
时间：<input type = "text" name = "userTime"/><br/>
<input type = "submit" value = "提交"/>
</form>

/**
* 获取时间参数
* @param user
* @return
*/
@RequestMapping(value = "/add4.do",method = RequestMethod.GET)
public String add(Date userTime){
System.out.println(userTime);
//输出示例：Thu Feb 03 09:11:00 CST 1994
return "userinfo/user_add";
}

/**
* 时间属性编辑器（自定义的类型转换）
*/
@InitBinder
public void initBinder(ServletRequestDataBinder bin){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd HH:MM:SS");
CustomDateEditor cust = new CustomDateEditor(sdf,true);
bin.registerCustomEditor(Date.class, cust);
}

四.返回页面

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