SSM笔记-SpringMVC的POJO

1、Spring MVC 会按请求参数名和 POJO 属性名进行自动匹
配，自动为该对象填充属性值。支持级联属性

2、使用 POJO 对象能绑定请求参数值，方便视图和handler之间数据传递

3、web.xml

<?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" version="3.1">
  <display-name>SpringMVC_3_POJO</display-name>
  <servlet>
    <servlet-name>springDispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springDispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

4、springmvc.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-4.3.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">

    <!-- 配置自动扫描包 -->
    <context:component-scan base-package="com.test.springmvc"></context:component-scan>

    <!-- 配置视图解析器,把handler返回值解析为实际视图 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

</beans>

5、Handler.java

package com.test.springmvc.handlers;

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.RequestMethod;

import com.test.springmvc.dao.Info;

@RequestMapping("/test")
@Controller
public class Handler {

    //测试POJO,SpringMVC会根据请求参数名和POJO类的属性名自动匹配为对应对象填充值
    //注意：支持级联操作
    @RequestMapping("/testPOJO")
    public String testPOJO(Info info){
        System.out.println("testPOJO info:"+info);
        return "result";
    }
}

6、Info.java

package com.test.springmvc.dao;

public class Info {

    Integer infoId;
    String infoName;
    String infoDesc;
    Detail detail;

    public Integer getInfoId() {
        return infoId;
    }
    public void setInfoId(Integer infoId) {
        this.infoId = infoId;
    }
    public String getInfoName() {
        return infoName;
    }
    public void setInfoName(String infoName) {
        this.infoName = infoName;
    }
    public String getInfoDesc() {
        return infoDesc;
    }
    public void setInfoDesc(String infoDesc) {
        this.infoDesc = infoDesc;
    }
    public Detail getDetail() {
        return detail;
    }
    public void setDetail(Detail detail) {
        this.detail = detail;
    }

    @Override
    public String toString() {
        return "Info [infoId=" + infoId + ", infoName=" + infoName + ", infoDesc=" + infoDesc + ", detail=" + detail
                + "]";
    }
}

7、Detail.java

package com.test.springmvc.dao;

public class Detail {

    Integer detailId;
    String detailName;

    public Integer getDetailId() {
        return detailId;
    }
    public void setDetailId(Integer detailId) {
        this.detailId = detailId;
    }
    public String getDetailName() {
        return detailName;
    }
    public void setDetailName(String detailName) {
        this.detailName = detailName;
    }
    @Override
    public String toString() {
        return "Detail [detailId=" + detailId + ", detailName=" + detailName + "]";
    }

}

8、index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="test/testPOJO" method="post">
        <input type="text" name="infoId" value="1">
        <input type="text" name="infoName" value="info">
        <input type="text" name="infoDesc" value="desc">
        <input type="text" name="detail.detailId" value="01">
        <input type="text" name="detail.detailName" value="detail">
        <input type="submit" name="submit" value="submit">

    </form>
</body>
</html>

9、result.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
result page
</body>
</html>

10、注意事项
(1)html的form表单中的参数名，需要跟bean中的参数名一致
(2)html的form表单中的参数名，如果需要使用级联操作的时候可以这样写如：detail.detailId (代表Info Bean中的Detail Bean对象里面的detailId参数)

11、项目目录

12、demo
https://download.csdn.net/download/qq_22778717/10599056

SSM笔记-SpringMVC的POJO

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