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struts2:使用Filter作为控制器的MVC

2015-05-11 18:52 211 查看

使用Fliter作为控制器，可以方便的在应用程序里对所有资源包括静态资源进行控制访问

以下是一个用Filter作为控制器的例子

程序结构

web.xml的配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <filter>
<filter-name>product</filter-name>
<filter-class>com.struts.first.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>product</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

index.jsp

<body>
<a href="product-input.action">product input</a>
</body>

input.jsp

<body>
<form action="product-save.action" method="post">
ProductName:<input type="text" name="productName"/>
<br/>
ProductDesc:<input type="text" name="productDesc"/>
<br/>
ProductPrice:<input type="text" name="productPrice"/>
<br/>
<input type="submit" value="submit"/>
</form>
</body>

details.jsp

<body>
ProductName:${requestScope.product.productId}<br/>
ProductName:${requestScope.product.productName}<br/>
ProductName:${requestScope.product.productDesc}<br/>
ProductName:${requestScope.product.productPrice}<br/>
</body>

FilterDispatcher.java

public class FilterDispatcher implements Filter {
@Override
public void destroy() {}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest req=(HttpServletRequest)request;
String path=null;
//1.获取servletPath
String servletPath=req.getServletPath();
System.out.println(servletPath);
//2.判断servletPath，若其等于"/product-input.action"则转发到
//  /WEB-INF/pages/input.jsp
if("/product-input.action".equals(servletPath)){
path="/WEB-INF/pages/input.jsp";
}
//3.若其等于"/product-input.action"则转发到/WEB-INF/pages/details.jsp
if("/product-save.action".equals(servletPath)){
//1).获取请求参数
String productName= request.getParameter("productName");
String productDesc= request.getParameter("productDesc");
String productPrice= request.getParameter("productPrice");
//2).把请求信息封装为一个Product对象
Product product =
new Product(null, productName, productDesc, Double.parseDouble(productPrice));
//3).模拟执行保存操作
System.out.println("save"+product.toString());
product.setProductId(1001);
//4).把Product对象保存到request中.${param.productName}->${requestScope.product.productName}
request.setA
4000
ttribute("product", product);
path="/WEB-INF/pages/details.jsp";
}

if(path!=null){
request.getRequestDispatcher(path).forward(request, response);
return;//重要。转发完就代表已经给过响应了，该方法就要结束，就不能在执行后面的doFilter了
}
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig config) throws ServletException {}
}

Product.java

public class Product {
private Integer productId;
private String productName;
private String productDesc;
private Double productPrice;
public Product(){}
public Product(Integer productId, String productName, String productDesc,
double productPrice) {
super();
this.productId = productId;
this.productName = productName;
this.productDesc = productDesc;
this.productPrice = productPrice;
}
public Integer getProductId() {
return productId;
}
public void setProductId(Integer productId) {
this.productId = productId;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public String getProductDesc() {
return productDesc;
}
public void setProductDesc(String productDesc) {
this.productDesc = productDesc;
}
public Double getProductPrice() {
return productPrice;
}
public void setProductPrice(Double productPrice) {
this.productPrice = productPrice;
}
@Override
public String toString() {
return "Product [productName=" + productName + ", productDesc="
+ productDesc + ", productPrice=" + productPrice + "]";
}
}

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标签： Struts

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