springmvc-返回值

今天做了一个返回值的练习，将后台的数据返回给前段页面。

下面将实例进行记录，方便后期自己的查找。

环境:

　JDK1.8

　Tomcat:8.0

　win7　

第一步：创建一个web项目并添加相关jar

　　项目目录如下图：

jsp页面代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="reg5.do">
        <input type="submit" value="提交" />
    </form>
    <br>
    <div>
        姓名：${name1 }<br>
        ${list1 }<br>     
        
    </div>
    
</body>
</html>

第二步：配置web.xml

　　web.xml代码如下，里面的加了一个拦截器

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>springmvc3test</display-name>
  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>
  
  <servlet>
      <servlet-name>springmvc3</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>springmvc3</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <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>
  </filter>
      <filter-mapping>
          <filter-name>characterEncodingFilter</filter-name>
          <url-pattern>/*</url-pattern>
      </filter-mapping>
  
</web-app>

第三步：配置springmvc核心配置：springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd  
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd  
            http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd  
            http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">  
    <!-- 注解驱动 -->
    <mvc:annotation-driven/>
    
    <!-- springmvc3的扫描驱动 -->
    <context:component-scan base-package="com.zgy.controller"></context:component-scan>    
    
    <!-- 试图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>   //返回原界面
        <property name="suffix" value=".jsp"></property>    
    </bean>

</beans>

第四步：编写UserInfo实体类：

package com.zgy.domain;

public class UserInfo {
    public Integer id;
    
    public String name;
    
    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;
    }

    @Override
    public String toString() {
        
        return "用户ID=" + id + ", 用户名=" + name + ",";
    }
        
    
}

第五步：编写控制器类RegController

package com.zgy.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
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.servlet.ModelAndView;

import com.zgy.domain.UserInfo;

@Controller
public class RegController {
        
        @RequestMapping("/reg.do")
        public String queryUser1(HttpServletRequest request) {
            String name="华总管";
            request.setAttribute("name1",name);
            
            UserInfo user = new UserInfo();
            user.setId(9527);
            user.setName("华安");
            request.setAttribute("user",user);
            
            return "index";            
        }
        
        
        @RequestMapping("/reg2.do")
        public String queryUser2(Map<String,Object> map) {
            UserInfo user = new UserInfo();
            user.setId(1002);
            user.setName("石榴");
            map.put("user3",user);
            
            return "index";
        }
        @RequestMapping("/reg3.do")
        public String queryUser3(Model model) {
            UserInfo user = new UserInfo();
            user.setId(1);
            user.setName("华夫人");
            
            model.addAttribute("user3",user);
            
            return "index";        
        }
        @RequestMapping("/reg4.do")
        public String queryUser4(Model model) {
            UserInfo user = new UserInfo();
            user.setId(1);
            user.setName("华夫人");
            List<UserInfo> list = new ArrayList<UserInfo>();
            list.add(user);
            model.addAttribute("list1",list);            
            return "index";            
        }
        
        
}

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原文地址：https://www.cnblogs.com/zhaoguoying/p/11393795.html