struts 拦截器demo

最新推荐文章于 2021-03-02 03:18:54 发布

师程工avaj

最新推荐文章于 2021-03-02 03:18:54 发布

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分类专栏： demo

本文链接：https://blog.youkuaiyun.com/u012500127/article/details/17767549

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本文介绍了一个使用Struts2框架实现的登录示例，详细展示了如何定义自定义拦截器并将其应用于具体Action中。通过两个自定义拦截器First和Second，确保了用户输入的有效性和安全性。

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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="interceptor" extends="struts-default" namespace="/intcp">
		<interceptors>
			<interceptor name="first" class="com.interceptor.First"></interceptor>
			<interceptor name="second" class="com.interceptor.Second"></interceptor>
			<interceptor-stack name="mystack">
				<interceptor-ref name="first"></interceptor-ref>
				<interceptor-ref name="second"></interceptor-ref>
				<interceptor-ref name="params"></interceptor-ref>
			</interceptor-stack>
		</interceptors>
		<action name="login" class="com.interceptor.Login">
			<interceptor-ref name="mystack"></interceptor-ref>
			<result name="success">/hello.jsp</result>
			<result name="error">/error.jsp</result>
		</action>
	</package>
</struts>

package com.interceptor;

import com.opensymphony.xwork2.ActionSupport;

public class Login extends ActionSupport {
	private static final long serialVersionUID = 1L;
	private String name;
	private String pass;

	public String execute() throws Exception {
		if (name.equals("admin")) {
			return SUCCESS;
		}
		return ERROR;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPass() {
		return pass;
	}

	public void setPass(String pass) {
		this.pass = pass;
	}

}

First.java

package com.interceptor;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class First extends AbstractInterceptor {
	private static final long serialVersionUID = 1L;

	@Override
	public String intercept(ActionInvocation next) throws Exception {
		ActionContext context = next.getInvocationContext();
		Map<String, Object> params = context.getParameters();
		String name = ((String[]) params.get("name"))[0];
		String pass = ((String[]) params.get("pass"))[0];
		if (name.trim().isEmpty() || pass.trim().isEmpty()) {
			return "error";
		}
		String result = next.invoke();
		System.out.println("end first");
		return result;
	}
}

Second.java

package com.interceptor;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class Second extends AbstractInterceptor {
	private static final long serialVersionUID = 1L;

	@Override
	public String intercept(ActionInvocation next) throws Exception {
		ActionContext context = next.getInvocationContext();
		Map<String, Object> params = context.getParameters();
		String name = ((String[]) params.get("name"))[0];
		String pass = ((String[]) params.get("pass"))[0];
		if (name.trim().length() < 4) {
			return "error";
		}
		String result = next.invoke();
		System.out.println("end second");
		return result;
	}
}