spring mvc: rss(xml)輸出

準備：

rss包插件

 Rome 庫及其依賴項rome-utils，jdom和slf4j

<!-- rss源依賴 -->
	<!-- https://mvnrepository.com/artifact/com.rometools/rome -->
	<dependency>
	    <groupId>com.rometools</groupId>
	    <artifactId>rome</artifactId>
	    <version>1.8.0</version>
	</dependency>
	<!-- https://mvnrepository.com/artifact/com.rometools/rome-utils -->
	<dependency>
	    <groupId>com.rometools</groupId>
	    <artifactId>rome-utils</artifactId>
	    <version>1.8.0</version>
	</dependency>
	<!-- https://mvnrepository.com/artifact/org.jdom/jdom -->
	<dependency>
	    <groupId>org.jdom</groupId>
	    <artifactId>jdom</artifactId>
	    <version>2.0.2</version>
	</dependency>
	<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
	<dependency>
	    <groupId>org.slf4j</groupId>
	    <artifactId>slf4j-api</artifactId>
	    <version>1.7.7</version>
	</dependency>

　　

須要Bean視圖解析

<!-- bean視圖解析 -->			
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver"/>		

　　

同時須要 一個RSSFeedViewer.java（相似的java來實現view視圖）

須要繼承：org.springframework.web.servlet.view.feed.AbstractRssFeedView 並複寫：buildFeedItems，buildFeedMetadata

視圖名：rssViewer（id名）

<bean id="rssViewer" class="json.RSSFeedViewer"/>

　　

RSS的基本元素

RSSMessage.java

package json;

import java.util.Date;

public class RSSMessage {

	String title;
	String url;
	String summary;
	Date createDate;
	
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public String getUrl() {
		return url;
	}
	public void setUrl(String url) {
		this.url = url;
	}
	public String getSummary() {
		return summary;
	}
	public void setSummary(String summary) {
		this.summary = summary;
	}
	public Date getCreateDate() {
		return createDate;
	}
	public void setCreateDate(Date createDate) {
		this.createDate = createDate;
	}	
	
}

　　

RSSFeedViewer視圖view，繼承AbstractRssFeedView（org.springframework.web.servlet.view.feed.AbstractRssFeedView）

並複寫：buildFeedMetadata， buildFeedItems

其中：buildFeedMetadata是增長rss(xml)的說明性的內容，buildFeedItems對數據從新組長成須要的格式

其中：List<RSSMessage> list = (List<RSSMessage>) model.get("person"); 是RssController.java傳遞過來的

package json;


import java.util.ArrayList;
import java.util.List;
import java.util.Map;

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

import org.springframework.web.servlet.view.feed.AbstractRssFeedView;

import com.rometools.rome.feed.rss.Channel;
import com.rometools.rome.feed.rss.Content;
import com.rometools.rome.feed.rss.Item;;

public class RSSFeedViewer extends AbstractRssFeedView {	
	
	
	@Override
	protected List<Item> buildFeedItems(Map<String, Object> model, HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		// TODO Auto-generated method stub
		
		
		//獲取controller渲染過來的數據
		List<RSSMessage> list = (List<RSSMessage>) model.get("person");
		List<Item> items = new ArrayList<Item>(list.size());
		for(RSSMessage tempContent: list)
		{
			Item item = new Item();
			Content content = new Content();
			content.setValue(tempContent.getSummary());
			
			item.setContent(content);
			item.setTitle(tempContent.getTitle());
			item.setLink(tempContent.getUrl());
			item.setPubDate(tempContent.getCreateDate());
			
			items.add(item);
		}
		
		
		return items;
	}

	@Override
	protected void buildFeedMetadata(Map<String, Object> model, Channel feed, HttpServletRequest request) {
		// TODO Auto-generated method stub
		
		//設置頭部信息
		feed.setTitle("school");
		feed.setDescription("suzhou school");
		feed.setLink("http://www.sina.com.cn");
		
		super.buildFeedMetadata(model, feed, request);
	}

	
	
}

　　

RssController.java

其中：mv.addObject("person", list) 是傳遞到RSSFeedViewer視圖中去的

package json;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class RssController {

	@RequestMapping(value="/rss/list", method=RequestMethod.GET)
	public ModelAndView rss()
	{
		List<RSSMessage> list = new ArrayList<RSSMessage>();
		RSSMessage rss = new RSSMessage();
		rss.setTitle("張三");
		rss.setUrl("http://www.sina.com.cn");
		rss.setSummary("張三合肥市委書記，省委常委...");
		rss.setCreateDate(new Date());
		list.add(rss);
		
		rss.setTitle("李四");
		rss.setUrl("http://www.baidu.com");
		rss.setSummary("李四省委祕書長，合肥市委副書記...");
		rss.setCreateDate(new Date());
		list.add(rss);
		
		ModelAndView mv = new ModelAndView();
		mv.setViewName("rssViewer");
		mv.addObject("person", list);
		return mv;
	}
	
}

　　

訪問地址：http://localhost:8080/gugua3/rss/list

<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" version="2.0">
  <channel>
    <title>school</title>
    <link>http://www.sina.com.cn</link>
    <description>suzhou school</description>
    <item>
      <title>鏉庡洓</title>
      <link>http://www.baidu.com</link>
      <content:encoded>鏉庡洓鐪佸縐樹功闀匡紝鍚堣偉甯傚鍓功璁�...</content:encoded>
      <pubDate>Thu, 17 May 2018 03:51:46 GMT</pubDate>
    </item>
    <item>
      <title>鏉庡洓</title>
      <link>http://www.baidu.com</link>
      <content:encoded>鏉庡洓鐪佸縐樹功闀匡紝鍚堣偉甯傚鍓功璁�...</content:encoded>
      <pubDate>Thu, 17 May 2018 03:51:46 GMT</pubDate>
    </item>
  </channel>
</rss>