Struts2: - 润新知

Struts2:

pom.xml:

<packaging>war</packaging>
<dependencies>

    <dependency>
        <groupId>org.apache.struts</groupId>
        <artifactId>struts2-core</artifactId>
        <version>2.3.24</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <path>/</path>
                <port>9001</port>
            </configuration>
        </plugin>
    </plugins>
</build>

web.xml:


<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
</welcome-file-list>
<filter>
    
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    
    <init-param>
        <param-name>struts.i18n.encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

struts.xml:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    
    <constant name="struts.i18n.encoding" value="utf-8"/>
    
    <constant name="struts.devMode" value="true"/>
    
    <constant name="struts.action.extension" value="action,"/>
    
    <constant name="struts.enable.DynamicMethodInvocation" value="true"/>
    <package name="demo1" extends="struts-default" namespace="/">
        
        <global-results>
            <result name="success">/success.jsp</result>
        </global-results>
        
        <action name="strutsDemo1" class="com.fly.action.action01" method="execute">

        </action>
        
        
        
        <action name="user" class="com.fly.action.userAction">

        </action>
        <action name="requestDemo" class="com.fly.action.requestDemo">

        </action>
        <action name="requestDemo2" class="com.fly.action.requestDemo2">
            <result name="success">/success2.jsp</result>
        </action>
    </package>
</struts>

index.jsp:

<body>
<a href="${pageContext.request.contextPath}/strutsDemo1.action">/strutsDemo1.action</a><br>
<h4>User管理:</h4>
<a href="${pageContext.request.contextPath}/user!find">查询用户</a><br>
<a href="${pageContext.request.contextPath}/user!update">修改用户</a><br>
<a href="${pageContext.request.contextPath}/user!delete">删除用户</a><br>
<hr>
<h4>servlet的api</h4>
    <form action="${pageContext.request.contextPath}/requestDemo2" method="post">
        name:<input type="text" name="name">
        age:<input type="text" name="age">
        <input type="submit">
    </form>

</body>

success.jsp:

<body>
<h4>成功</h4>
${requestName_name}
${requestName_age}
${sessionName_name}
${sessionName_age}
${applicationName_name}
${applicationName_age}
</body>

success2.jsp:

<body>
<h4>成功</h4>
${requestScope.name1}
${sessionScope.name2}
${applicationScope.name3}
</body>

action01:

public class action01 {
    public String execute(){
        System.out.println("执行了");
        /**
         * NONE 代表页面不跳转
         */
        return "success";
    }
}

userAction:

public class userAction extends ActionSupport {
    public String find(){
        System.out.println("查询联系人");
        return NONE;
    }
    public String update(){
        System.out.println("修改联系人");
        return NONE;
    }
    public String delete(){
        System.out.println("删除联系人");
        return NONE;
    }
}

requestDemo:

/**
* 访问servlet api方式一：不直接获取实例
*/
public class requestDemo extends ActionSupport {
    @Override
    public String execute() throws Exception {
        //接受表单的参数
        //使用struts2的ActionContext对象
        ActionContext context = ActionContext.getContext();
        Map<String, Object> parameters = context.getParameters();
        for (String s : parameters.keySet()) {
            String[] v = (String[]) parameters.get(s);
            System.out.println(s+":"+v[0]);
            //向request中存数据
            context.put("requestName_"+s,v[0]);
            //向session中存数据
            context.getSession().put("sessionName_"+s,v[0]);
            //向application中存数据
            context.getApplication().put("applicationName_"+s,v[0]);
        }
        return SUCCESS;
    }
}

requestDemo2:

public class requestDemo2 extends ActionSupport implements ServletRequestAware {
    HttpServletRequest request;
    @Override
    public String execute() throws Exception {
        request = ServletActionContext.getRequest();
        //接受表单的参数
        String name = this.request.getParameter("name");
        String age = this.request.getParameter("age");
        System.out.println(name+":"+age);
        //向request中存数据
        this.request.setAttribute("name1",name+"1");
        this.request.getSession().setAttribute("name2",name+"2");
        this.request.getSession().getServletContext().setAttribute("name3",name+"3");
        return SUCCESS;
    }

    public void setServletRequest(javax.servlet.http.HttpServletRequest request) {
//        this.request = request;
    }
}

数据封装：

属性驱动：

/**
* 属性封装驱动方式一:属性set
*/
public class dataDemo1 extends ActionSupport {
    //接受参数
    private String name;
    private int age;

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

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String execute() throws Exception {
        System.out.println(name+":"+age);
        return NONE;
    }
}

dataDemo2:

//页面提供表达式

public class dataDemo2 extends ActionSupport {
    //接受参数
    private User user;
    //还需提供对象的get
    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    @Override
    public String execute() throws Exception {
        System.out.println(user);
        return NONE;
    }
}

dataDemo3:

public class dataDemo3 extends ActionSupport implements ModelDriven<User> {
    private User user = new User();

    public User getModel() {
        return user;
    }
    @Override
    public String execute() throws Exception {
        System.out.println(user);
        return NONE;
    }

}

dataDemo4:

/**
* 封装list
*/
public class dataDemo4 extends ActionSupport{
    private List<User> list;

    public void setList(List<User> list) {
        this.list = list;
    }

    public List<User> getList() {
        return list;
    }

    @Override
    public String execute() throws Exception {
        for (User user : list) {
            System.out.println(user);
        }
        return NONE;
    }

}

dataDemo5:

/**
* 封装map
*/
public class dataDemo5 extends ActionSupport{
    private Map<String,User> map;

    public Map<String, User> getMap() {
        return map;
    }

    public void setMap(Map<String, User> map) {
        this.map = map;
    }

    @Override
    public String execute() throws Exception {
        for (String s : map.keySet()) {
            System.out.println(map.get(s));
        }
        return NONE;
    }

}

dataDriver.jsp:

<body>
<h1>属性驱动</h1>
<h2>方式一:提供set方法</h2>
<form action="${pageContext.request.contextPath}/datademo1" method="post">
    name:<input type="text" name="name">
    age:<input type="text" name="age">
    <input type="submit">
</form>
<h2>方式二:页面提供表达式</h2>
<form action="${pageContext.request.contextPath}/datademo2" method="post">
    name:<input type="text" name="user.name">
    age:<input type="text" name="user.age">
    <input type="submit">
</form>
<hr>
<h1>模型驱动</h1>
<form action="${pageContext.request.contextPath}/datademo3" method="post">
    name:<input type="text" name="name">
    age:<input type="text" name="age">
    <input type="submit">
</form>
<h1>封装list</h1>
<form action="${pageContext.request.contextPath}/datademo4" method="post">
    name:<input type="text" name="list[0].name">
    age:<input type="text" name="list[0].age">
    name:<input type="text" name="list[1].name">
    age:<input type="text" name="list[1].age">
    <input type="submit">
</form>
<h1>封装set</h1>
<form action="${pageContext.request.contextPath}/datademo5" method="post">
    name:<input type="text" name="map['A'].name">
    age:<input type="text" name="map['A'].age">
    name:<input type="text" name="map['B'].name">
    age:<input type="text" name="map['B'].age">
    <input type="submit">
</form>
</body>

EL特殊字体的使用:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
    <title>EL的特殊字符的使用</title>
</head>
<body>
<h1>EL的特殊字符的使用</h1>
<h2>#号的使用</h2>
<s:property value="#request.name"/>
<br>
<s:iterator value="#{'aaa':'111','bbb':'222'}" var="entry">
    <s:property value="key"/>----<s:property value="value"/>
    <s:property value="#entry.key"/>----<s:property value="#entry.value"/>
</s:iterator>
<br><hr>
<s:iterator value="list" var="entry1" status="st">
    <ul>
        <li><s:property value="list[#st.index].name"/>----<s:property value="list[#st.index].age"/></li>
        <li><s:property value="#entry1.name"/>----<s:property value="#entry1.age"/></li>
    </ul>
</s:iterator>
<br>
<s:radio list="#{'1':'男','2':'女'}" name="sex"/>
<h2>%号的使用</h2>
<%--强制解析OGNL表达式--%>
<s:textfield name="name" value="%{#request.name}"/>
<br>
<s:property value="%{#request.name}"/>
<br>
<%--强制不解析OGNL表达式--%>
<s:property value="%{'#request.name'}"/>
</body>
</html>

拦截器：

PriInterceptor：

public class PriInterceptor extends MethodFilterInterceptor {
    protected String doIntercept(ActionInvocation invocation) throws Exception {
        System.out.println("拦截器执行了");
        User1 existUser = (User1) ServletActionContext.getRequest().getSession().getAttribute("existUser");
        if (existUser==null){
            ActionSupport actionSupport = (ActionSupport) invocation.getAction();
            actionSupport.addActionError("没有登录");
            return actionSupport.LOGIN;
        }else {
            return invocation.invoke();
        }
    }
}


<interceptors>
    <interceptor name="priInterceptor" class="com.fly.interceptor.PriInterceptor"/>
    <interceptor-stack name="myStack">
        <interceptor-ref name="priInterceptor"/>
        <interceptor-ref name="defaultStack"/>
    </interceptor-stack>
</interceptors>

在action中配置：

<action name="user" class="com.fly.action.userAction">
    <interceptor-ref name="myStack"/>
</action>

标签使用：


<constant name="struts.ui.theme" value="simple"/>

Jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<s:if test="1>2">
    1>2
</s:if>
<s:elseif test="2>1">
    2>1
</s:elseif>
<s:else>
    2=1
</s:else>
<hr>
<table border="1">
    <tr>
        <th>索引</th>
        <th>个数</th>
        <th>值</th>
        <th>第一个</th>
        <th>最后一个</th>
        <th>偶数</th>
        <th>奇数</th>
    </tr>
    <%--begin默认是0--%>
    <s:iterator var="v" begin="1" end="10" step="2" status="st">
        <tr>
            <td><s:property value="#st.index"/></td>
            <td><s:property value="#st.count"/></td>
            <td><s:property value="#v"/></td>
            <td><s:property value="#st.first"/></td>
            <td><s:property value="#st.last"/></td>
            <td><s:property value="#st.even"/></td>
            <td><s:property value="#st.odd"/></td>
        </tr>
    </s:iterator>
</table>
<s:property value="'www.baidu.com'"/><br>
<s:property value="" default="123"/><br>
<%--忽略html代码--%>
<s:property value="'<h3>www.baidu.com<h3>'" escape="true"/><br>
<%--不忽略--%>
<s:property value="'<h3>www.baidu.com<h3>'" escape="false"/><br>
<s:a action="" namespace="/" href="index.jsp">index</s:a>
<hr>
<s:form action="" method="">
    <s:hidden name="" value=""/>
    <s:textfield label="用户名" name=""/>
    <s:password label="密码" name=""/>
    <s:radio label="性别" name="sex" list="#{'1':'男','2':'女'}" value="1"/>
    <s:checkboxlist label="爱好" name="" list="{'aa','bb','cc'}" labelposition="left"/>
    <s:select label="爱好" list="#{'1':'aaaa','2':'bbbb'}" listKey="key" listValue="value"/>
    <s:textarea label="描述" rows="5" cols="15"/>
    <s:file label="头像" name=""/>
    <s:reset value="重置"/>
    <s:submit value="提交"/>
</s:form>
</body>
</html>
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原文地址：https://www.cnblogs.com/fly-book/p/10145807.html