Spring MVC处理POST请求 – 开发狗の技术日志

SpringMVC处理POST请求时可以将收到的参数自动转换成POJO类型的类对象，所以只要定义一个POJO类，就能很简单的进行处理。

然后一顿复制粘贴：

POJO.java:
package com.explause.main;

public class POJO {
	private String msg1;
	private String msg2;
	
	public void setMsg1(String msg1) {
		this.msg1 = msg1;
	}
	public String getMsg1() {
		return this.msg1;
	}
	public void setMsg2(String msg2) {
		this.msg2 = msg2;
	}
	public String getMsg2() {
		return this.msg2;
	}
}

AppController.java:
package com.explause.main;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class AppController {
	private ModelAndView md = new ModelAndView();
	
	@GetMapping("/")
	public ModelAndView getController() {
		md.setViewName("get");
		return md;
	}
	
	@PostMapping("/")
	public ModelAndView postController(POJO getinfo) {
		md.setViewName("post");
		md.addObject("messages", getinfo);
		return md;
	}
}

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_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>POSTDemo</display-name>
  <servlet>
    <servlet-name>App</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>App</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

App-servlet.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:aop = "http://www.springframework.org/schema/aop"
   xmlns:mvc = "http://www.springframework.org/schema/mvc"
   xsi:schemaLocation = "http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-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/aop
   http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
   http://www.springframework.org/schema/mvc
   http://www.springframework.org/schema/mvc/spring-mvc.xsd">

	<context:component-scan base-package="com.explause.main"/>
	
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/"/>
		<property name="suffix" value=".jsp"/>
	</bean>
</beans>

get.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Get some messages</title>
</head>
<body>
<form method="POST" action="">
<label>Give some string:</label>
<input name="msg1"/>
<label>Give another string:</label>
<input name="msg2"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>

post.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Submitted messages</title>
</head>
<body>
<p>The first message:</p>
<p>${messages.msg1}
<p>The second message:</p>
<p>${messages.msg2}
</body>
</html>

最终的项目目录结构：

注意，和web相关的代码，根目录是webapp文件夹，App-servlet.xml文件中的prefix属性就是从webapp文件夹开始的。当然，可以在这个文件夹下自定义文件存放位置。

运行结果：

点击提交后：

分析一下：

Controller可以返回String对象，也可以返回ModelAndView对象。ModelAndView类可以接受一个 
viewName参数，指定某个View（jsp文件或别的，根据App-servlet.xml内prefix和suffix参数决定）。处理POST请求的控制器决定处理了POST请求后返回的View，因为View是jsp，需要和Model相相加才能生成最后的HTML。ModelAndView类的addObject方法可以为View设置Model它的第一个参数是Model名，第二个参数是Model值。Model实际上是一个Map数据类型。在jsp文件里可以像处理普通java代码一样使用它。那是jsp相关的知识了。

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