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SSM框架（二）四种控制器请求

分类: 文章 • 2024-09-03 21:03:28

目录

承接上一篇文章：SSM框架(一) 基于eclipseJee搭建SpingMVC框架
本文主讲在：controller类下的四种控制请求

一、请求接收

大致是如图流程，图中也不是很明白，详细讲述一下：
SSM框架（二）四种控制器请求

二、接收请求参数

1.字符串格式

Controller类的方法中加入形参String userName ,String userPassword
（注意jsp和controller类命名一致）

  • index.jsp主要代码：index.do

    <form action="index.do" method="post">
	<input type="text" name="userName"/><br/>
	<input type="text" name="userPassword"/><br/>
	<input type="submit" value="添加"/>
</form>

  • Controller.java：

    package com.cungudafa.spingmvc01.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/")
public class UserInfoController {
	
		@RequestMapping(value="index")
		public String userIndex(String userName,String userPassword){
		System.out.println("添加操作的业务逻辑:"+userName+" "+userPassword);
		return "success";
	}
}

  • 浏览器查看到：
    SSM框架（二）四种控制器请求
    SSM框架（二）四种控制器请求
    控制台打印：
    SSM框架（二）四种控制器请求

2.对象封装

如果请求中userName=xxx,自定义类

  • index.jsp主要代码：dologin.do

    <form action="dologin.do" method="post">
	<input type="text" name="userName"/><br/>
	<input type="text" name="userPassword"/><br/>
	<input type="submit" value="添加"/>
</form>

  • 创建bean目录和 UserInfo.java:
    SSM框架（二）四种控制器请求
    UserInfo.java:
    （注意在jsp调用时，标签的name要与实体里的private后名称相同，同理controller调用时get方法名称方法名也要一致）

    package com.cungudafa.spingmvc01.bean;

public class UserInfo {
	private Integer userId;
	private String userName;
	private String userPassword;
	
	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 getUserPassword() {
		return userPassword;
	}

	public void setUserPassword(String userPassword) {
		this.userPassword = userPassword;
	}
	public UserInfo(String name, String password) {
		super();
		this.userName = name;
		this.userPassword = password;
	}
	@Override
	public String toString() {
		return "User [用户=" + userName + ", 密码=" + userPassword + "]";
	}
}

  • 调用实体前必须更新一下配置，这里再贴一遍更新后的pom.xml、web.xml和sping-mvc.xml：
    pom.xml 增加了文件上传部分：

    	<!-- 文件上传 -->
	<dependency>
	    <groupId>commons-fileupload</groupId>
	    <artifactId>commons-fileupload</artifactId>
	    <version>1.3.3</version>
	</dependency>

    web.xml 增加了浏览器url解析
    SSM框架（二）四种控制器请求
    web.xml:

    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
       version="3.1" metadata-complete="true">

	<!-- 声明Spring的主配置文件 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:config/*.xml</param-value>
	</context-param>
	<!-- 配置Spring的监听器 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	
	<!-- 解析乱码 -->
	<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>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>characterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<!-- 配置SpringMVC后台 .do -->
	<servlet>
		<servlet-name>back</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:config/spring-mvc.xml</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
		<servlet-name>back</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>

</web-app>

    sping-mvc.xml: 相对之前增加了上传文件部分，解析包改为到最大目录com.cungudafa.spingmvc01
    SSM框架（二）四种控制器请求
    SSM框架（二）四种控制器请求
    sping-mvc.xml:

    <?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:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
	
	<!-- 启用注解 -->
	<mvc:annotation-driven></mvc:annotation-driven>
	
    <!-- 配置SpringMVC -->
    <!-- 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 -->  
	<context:component-scan base-package="com.cungudafa.spingmvc01" use-default-filters="false">
		<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
	</context:component-scan>
	<!-- 上传文件的处理器 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>
	
	<!-- JSP视图 -->
	<!-- 定义跳转的文件的前后缀 ，视图模式配置--> 
	<bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
	<!-- controller中return时会自动加上前缀和后缀，变成一个完整的url -->
		<property name="prefix" value="/WEB-INF/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
</beans>

  • Controller.java：

    package com.cungudafa.spingmvc01.controller;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.cungudafa.spingmvc01.bean.UserInfo;

@Controller
@RequestMapping("/")
public class UserInfoController {
	
	@RequestMapping(value="index")
	public String userIndex(String userName,String userPassword){//直接同命名
	System.out.println("添加操作的业务逻辑:"+userName+" "+userPassword);
	return "success";
	}

	@RequestMapping("login")
	public String login(){
		return "login";
	}
	@RequestMapping(value="dologin")
	public String login(UserInfo a,HttpSession session){//UserInfo a 封装对象，实例化；HttpSession session传值
		System.out.println("用户:"+a.getUserName()+"\t密码："+a.getUserPassword());
		session.setAttribute("user", a);//从后台controller再传回前端页面，可调用user打印出来
		return "success";
	}
}

  • 封装对象结果–浏览器查看到：
    SSM框架（二）四种控制器请求
    SSM框架（二）四种控制器请求
    控制台打印出：
    SSM框架（二）四种控制器请求

三、将某些值/某些对象放在session中

具体代码参考第二部分

四、跳转到目标视图/下一个Servlet

  • 在controller中加入关键代码：
    package com.cungudafa.spingmvc01.controller;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.cungudafa.spingmvc01.bean.UserInfo;

/*
 * 一个控制器
 * @author Administrator 
 * 
 */
@Controller
@RequestMapping("/")
public class UserInfoController {
	
	@RequestMapping(value="index")
	public String userIndex(String userName,String userPassword){
	System.out.println("添加操作的业务逻辑:"+userName+" "+userPassword);
	return "success";
	}

	@RequestMapping("login")
	public String login(){
		return "login";
	}
	@RequestMapping(value="dologin")
	public String login(UserInfo a,HttpSession session){
		System.out.println("用户:"+a.getUserName()+"\t密码："+a.getUserPassword());
		session.setAttribute("user", a);
		return "success";
	}
	@RequestMapping("index1")
	public void index1(HttpServletResponse response){
		try {
			response.sendRedirect("/SpingMVC01/index.jsp");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	@RequestMapping("index2")
	public void index2(HttpServletResponse response){
		try {
			PrintWriter out = response.getWriter();
			out.println("hello");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	@RequestMapping("index301")
	public String index301(){
		return "login";
	}
	@RequestMapping("index302")
	public @ResponseBody String index302(){
		return "login";
	}
	
	@RequestMapping("student/{id}")
	public String find(@PathVariable("id") Integer id,HttpSession session){
		System.out.println("id = " + id);
		session.setAttribute("id", id);
		return "index";
	}
	
}

情景1：response直接访问

SSM框架（二）四种控制器请求

  • 浏览器输入：http://localhost:8080/SpingMVC01/index2.do查看：
    SSM框架（二）四种控制器请求

情景2：控制跳转

SSM框架（二）四种控制器请求

  • 浏览器分别输入：http://localhost:8080/SpingMVC01/index301.do、http://localhost:8080/SpingMVC01/index302.do查看：
    SSM框架（二）四种控制器请求
    SSM框架（二）四种控制器请求

情景3：{id}记录

SSM框架（二）四种控制器请求

  • 浏览器输入：http://localhost:8080/SpingMVC01/student/1.do查看：
    SSM框架（二）四种控制器请求
    控制台打印出：
    SSM框架（二）四种控制器请求

  • -> 在这里我们在success.jsp设置一个打印符：
    success.jsp关键代码：

      <body>
  	<h1>success</h1>
      ${id}
 </body>

  • -> 将return的index页面换为success页面：
    controller关键代码：

    	@RequestMapping("student/{id}")
	public String find(@PathVariable("id") Integer id,HttpSession session){
		System.out.println("id = " + id);
		session.setAttribute("id", id);
		return "success";
	}

  • 运行结果：
    浏览器输入：http://localhost:8080/SpingMVC01/student/1.do查看：
    SSM框架（二）四种控制器请求
    控制台打印出：
    SSM框架（二）四种控制器请求

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