struts2学习之二-json插件

àì夳堔傛蜴生んèń 2022-04-12 06:38 148阅读 0赞

struts2学习之一：\[url\]http://arthur2014.iteye.com/admin/blogs/2162974\[/url\]  
struts2学习之三-spring注解：\[url\]http://arthur2014.iteye.com/admin/blogs/2162996\[/url\]  
struts2学习之四-struts2注解：\[url\]http://arthur2014.iteye.com/admin/blogs/2163348\[/url\]  
  
增加的jar包是struts2-json-plugin  
1、修改struts.xml文件，package不再继承struts-default，而要继承json-default，修改如下：

<?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="test" extends="json-default" namespace="/a">
    		<interceptors>
    			<interceptor-stack name="paramStack">
    				<interceptor-ref name="json" />
    				<interceptor-ref name="defaultStack" />
    			</interceptor-stack>
    		</interceptors>
    		<default-interceptor-ref name="paramStack" />
    
    		<global-results>
    			<result name="json" type="json">
    				
    				<param name="ignoreHierarchy">false</param>
    			</result>
    		</global-results>
    	</package>
    </struts>

2、抽象action父类：

package com.haochen.action;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    /**
     * 
     * @title
     * @Description 属性作为json格式参数时必需要有set方法，作为json格式返回值时必需要有get方法
     * @author chenhao
     * @date 2014年12月3日 上午10:14:48
     * @version 1.0
     */
    public abstract class BaseJsonAction extends ActionSupport {
       
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 8670042218701228785L;
    
    	protected static final String JSON = "json";
    	private Object data;
    	private boolean success;
    	private int errorCode;
    	private String errorMsg;
    
    	@Override
    	public abstract String execute() throws Exception;
    
    	public void success() {
       
    		this.success = true;
    	}
    
    	public void success(Object data) {
       
    		this.data = data;
    		this.success = true;
    	}
    
    	public void fail() {
       
    		this.success = false;
    	}
    
    	public void fail(int errorCode, String errorMsg) {
       
    		this.success = false;
    		this.errorCode = errorCode;
    		this.errorMsg = errorMsg;
    	}
    
    	public Object getData() {
       
    		return data;
    	}
    
    	public boolean isSuccess() {
       
    		return success;
    	}
    
    	public int getErrorCode() {
       
    		return errorCode;
    	}
    
    	public String getErrorMsg() {
       
    		return errorMsg;
    	}
    
    }

3、实现类UserJsonAction，以后的注解练习都会基于这个类写：

package com.haochen.action;
    
    import com.haochen.vo.User;
    
    /**
     * 
     * @title
     * @Description
     * @author chenhao
     * @date 2014年12月3日 下午7:00:08
     * @version 1.0
     */
    public class UserJsonAction extends BaseJsonAction {
       
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = -5818584581746655517L;
    	private User user;
    	private String name;
    
    	@Override
    	public String execute() throws Exception {
       
    		user = new User();
    		user.setName("tom");
    		user.setAge(18);
    		user.setSex('M');
    
    		/**
    		 * 1、返回值为JSON,配置文件struts.xml中的<action></action>不用设置<result
    		 * type="json"></result>。
    		 * 2、返回值为SUCCESS,配置文件struts.xml中的<action></action>需要设置<result
    		 * type="json"></result>。
    		 **/
    		return JSON;
    	}
    
    	public User getUser() {
       
    		return user;
    	}
    
    	public String getName() {
       
    		return name;
    	}
    
    	public void setName(String name) {
       
    		this.name = name;
    	}
    }

User.java

package com.haochen.vo;
    
    import java.io.Serializable;
    
    public class User implements Serializable {
       
    	private String name;
    	private int age;
    	private char sex;
    
    	public String getName() {
       
    		return name;
    	}
    
    	public void setName(String name) {
       
    		this.name = name;
    	}
    
    	public int getAge() {
       
    		return age;
    	}
    
    	public void setAge(int age) {
       
    		this.age = age;
    	}
    
    	public char getSex() {
       
    		return sex;
    	}
    
    	public void setSex(char sex) {
       
    		this.sex = sex;
    	}
    
    }

4、编写result.jsp，以ajax方式获取数据：

<%@ page language="java" contentType="text/html; charset=utf-8"
    	pageEncoding="utf-8"%>
    
    <%
    	String path = request.getContextPath();
    	String basePath = request.getScheme() + "://"
    			+ request.getServerName() + ":" + request.getServerPort()
    			+ path + "/";
    %>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Insert title here</title>
    <script type="text/javascript" src="<%=path%>/js/jquery-1.8.0.min.js"></script>
    </head>
    <body>
    	世界，你好.
    	<br>
    </body>
    
    <script type="text/javascript">
    	$(document).ready(function() {
       
    		$.ajax({
       
    			type : "post",
    			url : "userJson.action?name=tom",
    			dataType : "json",
    			success : function(data) {
       
    				alert(data.data.name);
    			},
    			error : function(XMLHttpRequest, textStatus, errorThrown) {
       
    				alert(errorThrown);
    			}
    		});
    	});
    </script>
    </html>

5、在struts.xml文件中添加如下代码：

6、发布，访问http://localhost:8080/struts2demo/a/helloworld.action，提示“tom”表示成功。