使用struts2制作做webservice

昨天去青软那边,认识到自己的不足,只做Android是不行的.前几天公司也让做服务器.于是今天开始拿起javaEE 以后还是好好做JavaEE+Android吧

看了一下黎老师的WebService,还是很典型的应用(黎老师的课程确实很棒啊!受益一生),可惜的是他用的struts做的也是今天中午移植到struts2 也算是练手+重温了.

进正题>

做Struts2 首先是配置工程这个很烦人,和Android比差的很远.

首先是

web.xml没什么好说的其实就是配置struts2

[html] <?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<filter>
    
    <filter-name>struts2</filter-name>
    
    <filter-class>
        org.apache.struts2.dispatcher.FilterDispatcher
    </filter-class>
</filter>

<filter-mapping>
    
    <filter-name>struts2</filter-name>
    
    <url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

struts.xml相当于Android中的AndroidManifest.xm

l 就一个action,返回两个结果,json和xml 貌似Android中现在很流行json的WebService

[html]
<?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="struts2" extends="struts-default">
        <action name="List" class="com.su.action.VideoListAction">
            <result name="xml">/videos.jsp</result>
            <result name="json">/jsonvideos.jsp</result>
        </action>
    </package>
</struts>

然后就是结果返回页面,先看xml的:跳转到videos.jsp 注意这里有一个struts的迭代器可以把获取的videos处理后输出

[html]
<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%><%@taglib prefix="s" uri="/struts-tags"%><?xml version="1.0" encoding="UTF-8"?>
<videos>
<s:iterator value="#request.videos" id="video">
    <video id="<s:property value="#video.id"/>">
    <title><s:property value="#video.title"/></title>
    <timelength><s:property value="#video.time"/></timelength>
    </video>
    </s:iterator>
</videos>

如果返回的是json那么是jsonviedos.jsp
[html]
<%@ page language="java" contentType="text/plain; charset=UTF-8" pageEncoding="UTF-8"%>${videos}

需要注意!xml文件中
<%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%><%@taglib prefix="s" uri="/struts-tags"%><?xml version="1.0" encoding="UTF-8"?>

这里尖括号直接不要有空格不然在chrome里不能识别为xml文件我想在解析的时候会报错(什么没有文件头什么的吧)

然后是java代码部分了

首先是VideoListAction.java也就是主action 相当于activity了

[java]
package com.su.action;

import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.su.domain.Video;
import com.su.service.VideoService;
import com.su.service.impl.VideoServiceBean;

public class VideoListAction extends ActionSupport {
    private VideoService service = new VideoServiceBean();
    private String format;
    public String getFormat() {
        return format;
    }
    public void setFormat(String format) {
        this.format = format;
    }

    @Override
    public String execute() throws Exception {
        List<Video> videos = service.getLastVideos();
        if (format.equals("json")) {
            StringBuilder json = new StringBuilder();
            json.append('[');
            for(Video video : videos){ // {id:76,title:"xxxx",timelength:80}
                json.append('{');
                json.append("id:").append(video.getId()).append(',');
                json.append("title:\"").append(video.getTitle()).append("\",");
                json.append("timelength:").append(video.getTime());
                json.append('}').append(',');
            }
            json.deleteCharAt(json.length()-1);

补充：综合编程 , 其他综合 ,