struts2 环境搭建

1、下载struts2相应jar包

http://struts.apache.org/download.cgi#struts-extras

http://archive.apache.org/dist/struts/binaries/

2、新建 JavaWeb工程

3、配置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/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>struts2</display-name>
  <welcome-file-list>
    <welcome-file>/WEB-INF/pages/organization/employee.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- struts2启动器 -->
    <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>*.action</url-pattern>
  </filter-mapping>
</web-app>

4、在src 下新建struts.xml文件,(本来想放在其他文件下通过web.xml文件<init-param>配置访问路径的,但是一直启动报错,只好放在src下了,查资料说好像和struts的版本有关系,反正不是什么重要的问题,就放过了)。

可以通过引用其他struts.xml文件,更加方便条理的管理struts配置文件(即,每个不同的模块包创建一个struts配置文件,例如:employee_struts.xml,之后通过<include>添加到struts.xml文件中)

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>
    <include file="conf/employee/employee_struts.xml"></include>
</struts>

5、编写访问action。此action返回json数据,需要创建一个private Map<String,Object> resultMap; 并且创建它的get、set方法。

     在action中为resultMap赋值,再将resultMap放在上下文中: ActionContext.getContext().put("pageView", resultMap);

  (pageView可以自己定义但必须和struts配置文件中 <param name="root">pageView</param>一致,root是ognl表达式定义的,不要更改)

package com.sxdx.employee.action;

import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;

import com.opensymphony.xwork2.ActionContext;


public class employeeAction {
    private static final Logger log = Logger.getLogger(employeeAction.class);
    private Map<String,Object> resultMap;
    public Map<String, Object> getResultMap() {
        return resultMap;
    }

    public void setResultMap(Map<String, Object> resultMap) {
        this.resultMap = resultMap;
    }


    public String showEmployeeList(){
        /*JSONObject cell = new JSONObject();
            
        result = cell.toString();*/
        resultMap = new HashMap<String, Object>();
            resultMap.put("eid", "002");
            resultMap.put("ename", "张三");
            resultMap.put("esex","男" );
            resultMap.put("eage","22" );
        ActionContext.getContext().put("pageView", resultMap);
        return "success";
    }
}

6、创建模块包级别的struts配置文件(此文件需要在第4部创建的文件中被引用才可生效)

employee_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>
     <package name="employee" namespace="/employee"  extends="json-default">
        <action name="employeeAction_*" class="com.sxdx.employee.action.employeeAction" method="{1}">
            <result name="success" type="json">
                <param name="root">pageView</param>
            </result>
        </action>
    </package>
</struts>

7、访问路径

http://localhost:8080/struts2/employee/employeeAction_showEmployeeList.action

8、结果

{"esex":"男","eage":"22","ename":"张三","eid":"002"}


注意:在返回json数据时需要struts2-json-plugin-2.3.4.jar 包的支持,但是一定要注意版本问题。
原文地址:https://www.cnblogs.com/Garnett-Boy/p/6646104.html