springmvc之前后台传值

一、向后台传值

1、项目结构

2、jar包

3、spring-config.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:oxm="http://www.springframework.org/schema/oxm"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/oxm
       http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
         http://www.springframework.org/schema/task
       http://www.springframework.org/schema/task/spring-task-3.2.xsd">

    <!--  通知spring容器通过注解的方式装配bean -->
      <context:annotation-config />
    <!--  通知spring容器采用自动扫描机制查找注解的bean -->
      <context:component-scan base-package="com.*" /> 

      <task:annotation-driven /> <!-- 定时器开关-->

      <bean id="agentExcelTask" class="com.timer.TimerController1"/>
    <task:scheduled-tasks>
        <task:scheduled ref="agentExcelTask" method="printstr" cron="* * 0/1000 * * ?"/>
    </task:scheduled-tasks>  

    <!--  配置返回页面过滤 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

4、LoginController.java，下面是spring向后台传值的三种方式。

package com.controller;

import javax.servlet.http.HttpServletRequest;

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

import com.demo.User;

@Controller
public class LoginController {

    /**
     * 使用HttpServletRequest获取
     */
    @RequestMapping("/login1")
    public String login1(HttpServletRequest request,Model model){
        model.addAttribute("name", request.getParameter("name"));
        model.addAttribute("password", request.getParameter("password"));
        return "success";
    }

    /**
     * spring自动将表单参数注入到方法参数,参数值和页面name属性一致时可以省去@RequestParam注解
     */
    @RequestMapping("/login2")
    public String login2(@RequestParam("name") String name, String password,Model model){
        model.addAttribute("name", name);
        model.addAttribute("password", password);
        return "success";
    }

    /**
     * 自动注入bean属性
     */
    @RequestMapping("/login3")
    public String login3(User user,Model model){
        model.addAttribute("name", user.getName());
        model.addAttribute("password", user.getPassword());
        return "success";
    }

}

注：第三种方式自动注入bean属性需要定义实体类，本例中定义User.java

5、User.java

package com.demo;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class User {

    @Id
    @GeneratedValue
    private long id;
    private String name;
    private String password;
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

}

6、index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<%
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>index</title>
  </head>

  <body>
    <form action="login2" method="post">
          用户：<input type="text" name="name"><br><br>
          密码：<input type="text" name="password"><br><br>
        <input type="submit" value="确定">
    </form>

    <!-- 使用message 标签配置需要显示的国际化文本,
           code  对应国际化文件中对应的键的名称  -->
    <span style="color: #2D2D2D;">
        <spring:message code="main.title"/>
    </span>
    <br>
    <input type="text" value="<spring:message code="main.target"/>">
  </body>
</html>

7、success.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>success</title>
  </head>

  <body>
    ${name},success. <br>
    用户名：${name},密码：${password}
  </body>
</html>

二、向前台传值的两种方式

package com.controller;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

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

import com.demo.User;

@Controller
public class LoginController {

    @RequestMapping("/login2")
    public String login2(@RequestParam("name") String name, String password,Model model){
        model.addAttribute("name", name);
        model.addAttribute("password", password);
        return "success";
    }

    return "success";
    }

    @RequestMapping("/login4")
    public String login4(User user, Map<String, Object> map){
        map.put("name", user.getName());
        map.put("password", user.getPassword());
        return "success";
    }

}

三、springmvc重定向

参考spring mvc controller间跳转 重定向 传参 （转）