Spring MVC-Controller

最新推荐文章于 2022-11-22 09:59:02 发布

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本文详细介绍了 Spring MVC 中三种控制器的使用方法：命令控制器(CommandController)、表单控制器(FormController)及向导表单控制器(WizardFormController)，并提供了具体的实现示例。

CommandController(命令控制器)
FormController(表单控制器)

WizardFormController(向导表单控制器)

CommandController(命令控制器)

* 需要继承AbstractCommandController类，并重写handle方法
* 通过构造方法注册命令类和命令名称，如：
public MyCommandController(){
//注册命令类
this.setCommandClass(Person.class);
//命令名称
this.setCommandName("person");
}

<!-- 命令控制器 -->
	<bean name="/mycommand.action" class="cn.itcast.springmvc.controller.MyCommandController"></bean>

public class Person {

	private String id;
	private String name;
	private String address;
	/**
	 * @return the id
	 */
	public final String getId() {
		return id;
	}
	/**
	 * @param id the id to set
	 */
	public final void setId(String id) {
		System.out.println("正在调用setId方法 ,id=" + id);
		this.id = id;
	}
	/**
	 * @return the name
	 */
	public final String getName() {
		return name;
	}
	/**
	 * @param name the name to set
	 */
	public final void setName(String name) {
		this.name = name;
	}
	/**
	 * @return the address
	 */
	public final String getAddress() {
		return address;
	}
	/**
	 * @param address the address to set
	 */
	public final void setAddress(String address) {
		this.address = address;
	}
	@Override
	public String toString() {
		return "{id:"+id+",name:"+name+",address:"+address+"}";
	}
}

/**
 * 自定义命令控制器
 *
 */
public class MyCommandController extends AbstractCommandController {//已不建议使用
	
	/**
	 * 通过构造方法注册命令类
	 */
	public MyCommandController() {
		this.setCommandClass(Person.class);//注册命令类
		this.setCommandName("person");//指定命令名称
	}

	@Override
	protected ModelAndView handle(HttpServletRequest req,
			HttpServletResponse resp, Object o, BindException arg3)
			throws Exception {
		
		Person p = (Person)o;
		System.out.println(p);
		return new ModelAndView("command");
	}

}

访问http://localhost/springmvc_1/mycommander.action?id=001&name=zhangsan&address=beijing

这些属性一定要和实体内的属性保持一致框架调用的是set方法

后台打印

FormController(表单控制器)

*需要继承SimpleFormController类，并重写doSubmitAction方法

*通过构造方法注册命令类和命令名称，如：

public MyFormController(){

this.setCommandClass(Person.class);

this.setCommandName("person");

}

* 在spring配置文件中对表单控制器进行配置，如：

</bean>

/**
 * 自定义表单控制器
 *
 */
public class MyFormController extends SimpleFormController {
	
	/**
	 * 通过构造方法注册命令类
	 */
	public MyFormController() {
		this.setCommandClass(Person.class);//注册命令类
		this.setCommandName("person");//指定命令名称
	}

	/**
	 * 当提交表单时会调用此方法
	 */
	protected void doSubmitAction(Object command) throws Exception {
		Person p = (Person)command;
		System.out.println("doSubmitAction-----person:" + p);
		super.doSubmitAction(command);
	}

}

<html>
  <head>
    <title>personForm.jsp</title>
  </head>
  
  <body>
    <form action="<%=path %>/myform.action" method="POST">
    	id:<input type="text" name="id"><br>
    	name:<input type="text" name="name"><br>
    	address:<input type="text" name="address"><br>
    	<input type="submit" value="提交">
    </form>
  </body>
</html>

http://localhost/springmvc_1/myform.action
后台打印

正在调用setId方法 ,id=xx
doSubmitAction-----person:{id:xx,name:xx,address:xx}
注意这里两次地址不变原因如下

WizardFormController(向导表单控制器)

*需要继承AbstractWizardFormController类，并重写processFinish方法

*通过构造方法注册命令类和命令名称，如：

public MyWizardFormController(){

this.setCommandClass(Person.class);

this.setCommandName("person");

}

* 在spring配置文件中对向导表单控制器进行配置，如：

<beanname="/wizard.action"id="myWizardFormControlle"class="cn.itcast.controller.MyWizardFormController">

<propertyname="pages">

<list>

<value>wizard/1</value>

<value>wizard/2</value>

<value>wizard/3</value>

</list>

</property>

</bean>

* 创建jsp页面，

1.jsp /WEB-INF/jsp/wizard/1.jsp

<%@ page language="java"import="java.util.*"pageEncoding="ISO-8859-1"%>

Stringpath = request.getContextPath();

StringbasePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<html>

<head>

</head>

<body>

<form action="<%=path %>/wizard.action"method="post">

name:<input type="text"name="name">

</form>

</body>

</html>

2.jsp /WEB-INF/jsp/wizard/2.jsp

<%@page language="java" import="java.util.*"pageEncoding="ISO-8859-1"%>

Stringpath = request.getContextPath();

StringbasePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<html>

<head>

</head>

<body>

<form action="<%=path %>/wizard.action"method="post">

age:<input type="text"name="age">

</form>

</body>

</html>

3.jsp /WEB-INF/jsp/wizard/3.jsp

<%@page language="java" import="java.util.*"pageEncoding="ISO-8859-1"%>

Stringpath = request.getContextPath();

StringbasePath= request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPEHTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

</head>

<body>

<form action="<%=path %>/wizard.action"method="post">

address:<input type="text"name="address">

</form>

</body>

</html>

**
 * 向导表单控制器
 *
 */
public class MyWizardFormController extends AbstractWizardFormController {
	
	@Override
	protected ModelAndView processCancel(HttpServletRequest request,
			HttpServletResponse response, Object command, BindException errors)
			throws Exception {
		return new ModelAndView("index");
	}

	public MyWizardFormController() {
		this.setCommandClass(Person.class);
		this.setCommandName("person");
	}

	@Override
	protected ModelAndView processFinish(HttpServletRequest arg0,
			HttpServletResponse arg1, Object arg2, BindException arg3)
			throws Exception {
		System.out.println("processFinish-----");
		return new ModelAndView("success");
	}

}

<!-- 向导表单控制器 -->
	<bean name="/mywizardform.action" class="cn.itcast.springmvc.controller.MyWizardFormController">
		<!-- 配置表单页面 -->
		<property name="pages">
			<list>
				<value>/wizard/1</value>
				<value>/wizard/2</value>
				<value>/wizard/3</value>
			</list>
		</property>
	</bean>

用EL表达式做页面回显

<html>
  <head>
    <title>1.jsp</title>
  </head>
  
  <body>
    <form action="<%=path %>/mywizardform.action" method="post">
    	id:<input type="text" name="id" value="${requestScope.person.id }"><br>
    	<input type="submit" name="_cancel" value="取消">
    	<input type="submit" name="_target1" value="下一步">
    </form>
  </body>
</html>

<html>
  <head>
    <title>2.jsp</title>
  </head>
  
  <body>
    <form action="<%=path %>/mywizardform.action" method="post">
    	name:<input type="text" name="name" value="${requestScope.person.name }"><br>
    	<input type="submit" name="_target0" value="上一步">
    	<input type="submit" name="_cancel" value="取消">
    	<input type="submit" name="_target2" value="下一步">
    </form>
  </body>
</html>

<html>
  <head>
    <title>3.jsp</title>
  </head>
  
  <body>
    <form action="<%=path %>/mywizardform.action" method="post">
    	address:<input type="text" name="address" value="${requestScope.person.address }"><br>
    	<input type="submit" name="_target1" value="上一步">
    	<input type="submit" name="_cancel" value="取消">
    	<input type="submit" name="_finish" value="完成">
    </form>
  </body>
</html>