struts2 参数注入 方法拦截器
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web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:web="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd http://java.sun.com/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee" id="WebApp_9" version="2.4">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="crm" namespace="/" extends="struts-default" >
<interceptors>
<interceptor name="myInter" class="com.huawei.interceptor.MyInterceptor" />
<interceptor name="myMethodInter" class="com.huawei.interceptor.MyMethodInterceptor" >
<param name="includeMethods">test1,test3</param>
<!-- <param name="excludeMethods">test2,test4</param> -->
</interceptor>
<interceptor-stack name="myStack">
<!-- 拦截器的执行顺序是根据 interceptor-ref的前后顺序-->
<!-- <interceptor-ref name="defaultStack" /> -->
<!-- <interceptor-ref name="myInter" /> -->
<interceptor-ref name="myMethodInter" />
<!-- <interceptor-ref name="token" /> -->
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="myStack" />
<!-- 全局result -->
<global-results>
<result name="success">/ok.jsp</result>
</global-results>
</package>
<package name="default" namespace="/" extends="crm">
<action name="firstAction" class="com.huawei.s2.action.FirstAction" >
<!-- <result name="invalid.token" >/error.jsp</result> -->
</action>
</package>
</struts>
1.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>This is my JSP page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<form action="firstAction">
<input name="uname" value="zhangsan"><br>
<input name="sal" value="10000.0"><br>
<%-- <s:token></s:token> --%>
<input type="submit" value="提交">
</form>
</body>
</html>
MyInterceptor:
package com.huawei.interceptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
/**
* 要么实现 Interceptor 接口 要么 继承类
* @author Administrator
*
*/
public class MyInterceptor extends AbstractInterceptor{
//以下要实现参数注入的功能
@Override
public String intercept(ActionInvocation invocation) throws Exception {
Object actionObj =invocation.getAction();//获取action
Class clazz = actionObj.getClass();//action对象对应的反射对象
Map<String, Object> paramsMap = ActionContext.getContext().getParameters();
if(paramsMap!=null&¶msMap.size()>0){
for(String key:paramsMap.keySet()){
Field field = clazz.getDeclaredField(key);
String setterName = "set"+key.substring(0,1).toUpperCase()+key.substring(1);
Method setterMethod = clazz.getDeclaredMethod(setterName, field.getType());
String[] mapValue = (String[]) paramsMap.get(key);
if(field.getType()==Double.class){
setterMethod.invoke(actionObj, Double.parseDouble(mapValue[0]));
}else {
setterMethod.invoke(actionObj, mapValue[0]);
}
}
}
invocation.invoke();
return null;
}
}
MyMethodInterceptor:
package com.huawei.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
/**
* function:方法拦截器
* @author Administrator
*
*/
public class MyMethodInterceptor extends MethodFilterInterceptor {
@Override
protected String doIntercept(ActionInvocation invocation) throws Exception {
System.out.println("方法执行前");
invocation.invoke();
System.out.println("方法执行后");
return null;
}
}
action:
package com.huawei.s2.action;
public class FirstAction {
private String uname;
private Double sal;
public String execute(){
System.out.println(uname+"========FirstAction======="+sal);
return "success";
}
/**
* test1()~test4():是用于验证方法拦截器的
*/
public void test1(){
System.out.println("=======FirstAction =========test1=====");
}
public void test2(){
System.out.println("=======FirstAction =========test2=====");
}
public void test3(){
System.out.println("=======FirstAction =========test3=====");
}
public void test4(){
System.out.println("=======FirstAction =========test4=====");
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public Double getSal() {
return sal;
}
public void setSal(Double sal) {
this.sal = sal;
}
}
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