SpringMVC -- 梗概--源码--壹--数据传递

附：实体类

Class ： User

package com.c61.entity;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.format.annotation.DateTimeFormat;

import com.alibaba.fastjson.annotation.JSONField;

public class User {
    private Integer id;
    private String name;
    //@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")
    @DateTimeFormat(pattern="yyyy-MM-dd")//定制在接收请求参数时的日期格式
    @JSONField(format="yyyy-MM-dd")//作用在java序列化成json时
    private Date birth;
    private String dateStr;

    public String getDateStr() {
        return dateStr;
    }
    public void setDateStr(String dateStr) {
        this.dateStr = dateStr;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Date getBirth() {
        return birth;
    }
    public void setBirth(Date birth) {
        this.birth = birth;
        SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd");
        this.dateStr=format.format(birth);
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", birth=" + birth + "]";
    }
    public User(){}
    public User(Integer id, String name, Date birth) {
        super();
        this.id = id;
        this.name = name;
        this.birth = birth;
    }

}

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

1.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <!-- 前端控制器
         /=默认的url-pattern
         /a/b/c  /a

         /a/d/c
         /a/d
         /a
         /
         *注意：此控制器默认加载/WEB-INF下的xxx-servlet.xml文件
                        ：其中xxx等于【DispatcherServlet的配置名】
  -->
  <servlet>
      <servlet-name>mvc61</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:mvc62.xml</param-value>
      </init-param>
      <!-- 随项目启动而启动 -->
      <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>mvc61</servlet-name>
      <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- 专治Post请求参数乱码 -->
  <filter>
      <filter-name>encoding61</filter-name>
      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <!-- 将请求的编码方式设置为utf-8 -->
      <init-param>
          <param-name>encoding</param-name>
          <param-value>utf-8</param-value>
      </init-param>
  </filter>
  <filter-mapping>
      <filter-name>encoding61</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

2.配置控制器

Class : DataController

package com.c61.controller;

import java.util.Date;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

import com.c61.entity.User;

@Controller
@RequestMapping(value="/mvc4")//等价于namespace
public class DataController {
    //DefaultAnnotationHandlerMapping a;
    @RequestMapping("/data1")//等价于<action name="mvc1"
    public String testData(HttpServletRequest req){
        req.setAttribute("name", "limeOracle");
        User user=new User();
        user.setId(1);
        user.setName("lime");
        user.setBirth(new Date());
        req.setAttribute("user", user);
        return "forward:/data.jsp";
    }
    @RequestMapping("/data2")//等价于<action name="mvc1"
    public String testData2(HttpSession session,Integer id,String name,HttpServletRequest req){
        session.setAttribute("name", "limeOracle");
        User user=new User();
        user.setId(1);
        user.setName("lime");
        user.setBirth(new Date());
        session.setAttribute("user", user);
        return "redirect:/data2.jsp";
    }
    @RequestMapping("/data3")//等价于<action name="mvc1"
    public String testData3(Model model,Map map,ModelMap modelM){
        User user=new User();
        user.setId(1);
        user.setName("lime");
        user.setBirth(new Date());
        //model.addAttribute("user",user);
        //model.addAttribute("name", "Oracle");
        //map.put("user", user);
        //map.put("name", "Oracle2");
        modelM.addAttribute("user", user);
        modelM.addAttribute("name", "Oracle3");
        return "forward:/data.jsp";
    }
    //当使用 Model，Map,ModelMap在重定向中传值时，可以将简单数据(数字,字符串)拼接在url中
    @RequestMapping("/data4")//等价于<action name="mvc1"
    public String testData4(Model model,Map map,ModelMap modelM){
        User user=new User();
        user.setId(1);
        user.setName("lime");
        user.setBirth(new Date());
        //model.addAttribute("user",user);
        //model.addAttribute("name", "Oracle");
        //map.put("user", user);
        //map.put("name", "Oracle2");
        modelM.addAttribute("user", user);
        modelM.addAttribute("name", "Oracle3");
        return "redirect:/data.jsp";
    }
}

3 配置视图

View : data.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

  <body>
    name:${requestScope.name}--<br/>
    user.id:${requestScope.user.id }--<br/>
    user.name:${requestScope.user.name }--<br/>
    user.dateStr:${requestScope.user.dateStr }--<br/>
    param.name:${param.name }--<br/>
  </body>
</html>

Client :

View : data2.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

  <body>
    name:${sessionScope.name}--<br/>

    user.id:${sessionScope.user.id }--<br/>
    user.name:${sessionScope.user.name }--<br/>
    user.dateStr:${sessionScope.user.dateStr }--<br/>

    param.name:${param.name }<br/>
  </body>
</html>

Client :

Client :

View : data.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

  <body>
    name:${requestScope.name}--<br/>
    user.id:${requestScope.user.id }--<br/>
    user.name:${requestScope.user.name }--<br/>
    user.dateStr:${requestScope.user.dateStr }--<br/>
    param.name:${param.name }--<br/>
  </body>
</html>

Client :

View : data.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

  <body>
    name:${requestScope.name}--<br/>
    user.id:${requestScope.user.id }--<br/>
    user.name:${requestScope.user.name }--<br/>
    user.dateStr:${requestScope.user.dateStr }--<br/>
    param.name:${param.name }--<br/>
  </body>
</html>

Client :

Client :

转发中数据传递

1>利用HttpServletRequest
    public String testData(HttpServletRequest req){
        req.setAttribute("name", "limeOracle");
        ...
    }
    页面中${requestScope.name}
2>Model  Map   ModelMap 存活周期为一个请求，可以在一个请求内数据传递
    public String testData3(Model model,Map map,ModelMap modelM){
        User user=new User(...);
        //model.addAttribute("user",user);
        //model.addAttribute("name", "Oracle");
        //map.put("user", user);
        //map.put("name", "Oracle2");
        modelM.addAttribute("user", user);
        modelM.addAttribute("name", "Oracle3");
        ...
    }
    页面中${requestScope.name}
         ${requestScope.user.id}

重定向中数据传递

1>利用session
  public String testData2(HttpSession session）{
    session.setAttribute(“name”,xxx);
  }
  页面中：${sessionScope.name}
2>如果数据是简单数据(数字,字符串)的话
  public String testData4(Model model,Map map,ModelMap modelM){
    //会将简单数据拼接在url中，成为请求参数
    modelM.addAttribute("name", "Oracle3");
    return "redirect:/data.jsp";
  }
  页面中${param.name}

在JSP(View)中取值

EL+JSTL
${xxxx}
<c:if>
<c:forEach>

啦啦啦