SSM框架（二）四种控制器请求【前端->值->后端】
目录
- 一、请求接收
- 二、接收请求参数
- 1.字符串格式
- 2.对象封装
- 三、将某些值/某些对象放在session中
- 四、跳转到目标视图/下一个Servlet
- 情景1：response直接访问
- 情景2：控制跳转
- 情景3：{id}记录
- 五、接收特殊参数
- （一）文件参数
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：
- 搭建：参考前面一章 SSM框架(一) 基于eclipseJee搭建SpingMVC框架
- 主要目录：
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：
控制台打印：
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:
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：<dependency> <groupId>commons-fileuploadgroupId> <artifactId>commons-fileuploadartifactId> <version>1.3.3version> dependency>web.xml 增加了浏览器url解析
web.xml:<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"> <context-param> <param-name>contextConfigLocationparam-name> <param-value>classpath:config/*.xmlparam-value> context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class> listener> <filter> <filter-name>characterEncodingFilterfilter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class> <init-param> <param-name>encodingparam-name> <param-value>UTF-8param-value> init-param> <init-param> <param-name>forceEncodingparam-name> <param-value>trueparam-value> init-param> filter> <filter-mapping> <filter-name>characterEncodingFilterfilter-name> <url-pattern>/*url-pattern> filter-mapping> <servlet> <servlet-name>backservlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class> <init-param> <param-name>contextConfigLocationparam-name> <param-value>classpath:config/spring-mvc.xmlparam-value> init-param> servlet> <servlet-mapping> <servlet-name>backservlet-name> <url-pattern>*.dourl-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
sping-mvc.xml:<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"> <mvc:annotation-driven>mvc:annotation-driven> <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> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">bean> <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <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：
控制台打印出：
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
- 浏览器输入：
http://localhost:8080/SpingMVC01/index2.do查看：
情景2：控制跳转
- 浏览器分别输入：
http://localhost:8080/SpingMVC01/index301.do、http://localhost:8080/SpingMVC01/index302.do查看：
情景3：{id}记录
-
浏览器输入：
http://localhost:8080/SpingMVC01/student/1.do查看：
控制台打印出：
-
-> 在这里我们在success.jsp设置一个打印符：
success.jsp关键代码：<body> <h1>successh1> ${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：
控制台打印出：
五、接收特殊参数
（一）文件参数
-
配置spring-mvc.xml，上传文件的处理器
完整spring-mvc.xml：<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"> <mvc:annotation-driven>mvc:annotation-driven> <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> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">bean> <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/">property> <property name="suffix" value=".jsp">property> bean> beans> -
pom.xml中：（前面有添加，这里不贴源码，注意添加完pom.xml文件后，项目右键Maven-》update Project）
-
修改
index.jsp: (form action=“file/upload.do”)
index.jsp：<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title heretitle> head> <body> <h1>Helloworldh1> <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> <h1>文件上传h1> <form action="file/upload.do" enctype="multipart/form-data" method="post"> <input type="file" name="uploadFile"> <button type="submit">上传button> form> body> html> -
创建
FileController.java: (路径为 /file/upload.do )
FileController.java:package com.cungudafa.spingmvc01.controller; import java.io.IOException; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; @Controller @RequestMapping("/file") public class FileController { @RequestMapping("/upload") public String upload(MultipartFile uploadFile) throws IOException{ System.out.println("uploadFile = " + uploadFile); //获得上传字节数 byte[] buf = uploadFile.getBytes(); System.out.println("上传文件大小：" + buf.length); //获得上传文件名称 System.out.println("上传文件名称getName = " + uploadFile.getName()); System.out.println("上传文件名称getOriginalFilename = " + uploadFile.getOriginalFilename()); return "index"; } }- 运行结果：浏览器输入
http://localhost:8080/SpingMVC01/index.jsp查看：
控制台打印出：（getOriginalFilename才是上传前的文件名）
- 运行结果：浏览器输入