Controller注解使用

Spring利用扫描机制来找到应用程序所有基于注解的控制器。

1.配置文件中声明：

xmlns:context="http://www.springframework.org/schema/context"；

2. 指定控制器的基本包：

<context:component-scan base-package="packageName"/> ;

例：

web.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                      http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0"
  metadata-complete="true">
    <servlet>
      <servlet-name>springmvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/config/springmvc-config.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>/</url-pattern>
    </servlet-mapping>


</web-app>

springmvc-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: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-4.3.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">  
    <context:component-scan base-package="controller"/>
    
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <!-- 后缀 -->
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

应用：

1.目录结构：

2.web.xml 与config见上面例子；

3.Controller类:

package controller;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import domian.Product;
import form.ProductForm;

@Controller
public class ProductController {
private static final Log logger=LogFactory.getLog(ProductController.class);
//添加商品
@RequestMapping(value="/add2")
public String addForm() {
logger.info("inputProduct called!!!");
return "FormProduct";
}
//保存商品
@RequestMapping(value="/saved2")
public String savedProduct(ProductForm productform,Model model) {
Product product = null;
try {
logger.info("savedProduct called");
product=new Product(productform.getName(), productform.getDescription(), Double.parseDouble(productform.getPrice()));
} catch (Exception e) {
// TODO: handle exception
}
model.addAttribute("product", product);
return "savedProduct";
}

}

//domain

4.Product类：

package domian;

public class Product {
private String name;
private String description;
private double price;
public Product(String name, String description, double price) {
super();
this.name = name;
this.description = description;
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}

}

5.ProductForm类

package form;

public class ProductForm {
private String name;
private String description;
private String price;

public ProductForm() {
super();
}
public ProductForm(String name, String description, String price) {
super();
this.name = name;
this.description = description;
this.price = price;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}

}

View:

6.产品添加：

<%@ 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>
<form action="saved2">
<fieldset>
<legend>Add a product</legend>
<table>

<tr>
<td>Product Name:</td>
<td><input type="text" name="name"/></td>
</tr>


<tr>
<td>Product Description:</td>
<td><input type="text" name="description"></td>
</tr>


<tr>
<td>Product price:</td>
<td><input type="text" name="price"></td>
</tr>



<tr>
<td><input type="reset"/>
</td><td><input type="submit"/></td>
</tr>
</table>
</fieldset>
</form>
</body>
</html>

6.产品保存：

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