java生成rss feed

package net.blogjava.rss;import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.sun.syndication.feed.WireFeed;
import com.sun.syndication.feed.synd.SyndContent;
import com.sun.syndication.feed.synd.SyndContentImpl;
import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndEntryImpl;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.feed.synd.SyndFeedImpl;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedOutput;
import com.sun.syndication.io.WireFeedOutput;/**
* Servlet implementation class FeedServlet
*/
public class FeedServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String DEFAULT_FEED_TYPE = "default.feed.type";
private static final String FEED_TYPE = "type";
private static final String MIME_TYPE = "application/xml; charset=UTF-8";
private static final String COULD_NOT_GENERATE_FEED_ERROR = "Could not generate feed error!";
private static final DateFormat DATE_PARSER = new SimpleDateFormat(
"yyyy-MM-dd");
private String _defaultFeedType; /**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
_defaultFeedType = config.getInitParameter(DEFAULT_FEED_TYPE);
_defaultFeedType = (_defaultFeedType != null) ? _defaultFeedType
: "atom_0.3";
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws IOException {
try {
SyndFeed feed = getFeed(request);
String feedType = request.getParameter(FEED_TYPE);
feedType = (feedType != null) ? (checkFeedType(feedType) ? feedType
: _defaultFeedType) : _defaultFeedType; feed.setFeedType(feedType);
response.setContentType(MIME_TYPE);
SyndFeedOutput output = new SyndFeedOutput();
output.output(feed, response.getWriter());
//ws
System.out.println(output.outputString(feed));
/**
* And now you have an RSS feed ready to go! To write your RSS feed to an output stream,
* just use the SyndFeedOutput class, as shown in Listing 5.Listing 5. Publishing the feed
Writer writer = new FileWriter("stream.xml");
 SyndFeedOutput output = new SyndFeedOutput();
 output.output(feed,writer);
 writer.close(); */
/*WireFeed wfeed = feed.createWireFeed();
WireFeedOutput out = new WireFeedOutput();
out.output(wfeed, response.getWriter());

System.out.println(out.outputString(wfeed));*/
/*Feed fedd1 = new Feed();
WireFeedOutput out = new WireFeedOutput();
WireFeed wfeed = null;
try {
wfeed = (WireFeed) fedd1.clone();
} catch (CloneNotSupportedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
out.output(wfeed, response.getWriter());*/
//ws

} catch (FeedException e) {
String msg = COULD_NOT_GENERATE_FEED_ERROR;
log(msg, e);
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
msg);
}
} protected SyndFeed getFeed(HttpServletRequest req) throws IOException,
FeedException {
SyndFeed feed = new SyndFeedImpl(); feed.setTitle("RSS订阅内容");
feed.setLink("http://hi.baidu.com/imxzl");
feed.setDescription("这里是描述！！！"); List<SyndEntry> entries = new ArrayList<SyndEntry>();
SyndEntry entry;
SyndContent description; entry = new SyndEntryImpl();
entry.setTitle("ROME v0.1");
entry.setLink("http://wiki.java.net/bin/view/Javawsxml/rome01");

try {
entry.setPublishedDate(DATE_PARSER.parse("2004-06-08"));
} catch (ParseException ex) {
// IT CANNOT HAPPEN WITH THIS SAMPLE
}
description = new SyndContentImpl();
description.setType("text/plain");
description.setValue("Initial release of ROME");
entry.setDescription(description);
entries.add(entry); entry = new SyndEntryImpl();
entry.setTitle("Rome v0.2");
entry.setLink("http://wiki.java.net/bin/view/Javawsxml/rome02");
try {
entry.setPublishedDate(DATE_PARSER.parse("2004-06-16"));
} catch (ParseException ex) {
// IT CANNOT HAPPEN WITH THIS SAMPLE
}
description = new SyndContentImpl();
description.setType("text/html");
description
.setValue("Bug fixes, minor API changes and some new features"
+ "For details check the <a href=\"http://wiki.java.net/bin/view/Javawsxml/RomeChangesLog#RomeV02\">Changes Log for 0.2</a>");
entry.setDescription(description);
entries.add(entry); entry = new SyndEntryImpl();
entry.setTitle("ROME v0.3");
entry.setLink("http://wiki.java.net/bin/view/Javawsxml/rome03");
try {
entry.setPublishedDate(DATE_PARSER.parse("2004-07-27"));
} catch (ParseException ex) {
// IT CANNOT HAPPEN WITH THIS SAMPLE
}
description = new SyndContentImpl();
description.setType("text/html");
description
.setValue("Bug fixes, API changes, some new features and some Unit testing"
+ "For details check the <a href=\"http://wiki.java.net/bin/view/Javawsxml/RomeChangesLog#RomeV03\">Changes Log for 0.3</a>");
entry.setDescription(description);
entries.add(entry); entry = new SyndEntryImpl();
entry.setTitle("ROME v0.4");
entry.setLink("http://wiki.java.net/bin/view/Javawsxml/rome04");

try {
entry.setPublishedDate(DATE_PARSER.parse("2004-09-24"));
} catch (ParseException ex) {
// IT CANNOT HAPPEN WITH THIS SAMPLE
}
description = new SyndContentImpl();
description.setType("text/html");
description
.setValue("Bug fixes, API changes, some new features, Unit testing completed"
+ "For details check the <a href=\"http://wiki.java.net/bin/view/Javawsxml/RomeChangesLog#RomeV04\">Changes Log for 0.4</a>");
entry.setDescription(description);
entries.add(entry); feed.setEntries(entries);

return feed;
} private boolean checkFeedType(String feedType) {
boolean isFeedType = false;
if (feedType.equals("rss_2.0") || feedType.equals("atom_0.3")) {
isFeedType = true;
}
return isFeedType;
}
}

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package com.example.programmingas3.simpleclock { import flash.display.Sprite;

public class SimpleClock extends Sprite
{
import com.example.programmingas3.simpleclock.AnalogClockFace;
import flash.events.TimerEvent;
import flash.utils.Timer;

/**
* The time display component.
*/
public var face:AnalogClockFace;

/**
* The Timer that acts like a heartbeat for the application.
*/
public var ticker:Timer;

public static const millisecondsPerMinute:int = 1000 * 60;
        public static const millisecondsPerHour:int = 1000 * 60 * 60;
        public static const millisecondsPerDay:int = 1000 * 60 * 60 * 24;

/**
* Sets up a SimpleClock instance.
*/
public function initClock(faceSize:Number = 200):void
{
    // sets the invoice date to today’s date
            var invoiceDate:Date = new Date();

            // adds 30 days to get the due date
            var millisecondsPerDay:int = 1000 * 60 * 60 * 24;
            var dueDate:Date = new Date(invoiceDate.getTime() + (30 * millisecondsPerDay));            var oneHourFromNow:Date = new Date(); // starts at the current time
    oneHourFromNow.setTime(oneHourFromNow.getTime() + millisecondsPerHour);

// Creates the clock face and adds it to the Display List
face = new AnalogClockFace(Math.max(20, faceSize));
face.init();
addChild(face);

// Draws the initial clock display
face.draw(); // Creates a Timer that fires an event once per second.
         ticker = new Timer(1000);

         // Designates the onTick() method to handle Timer events
            ticker.addEventListener(TimerEvent.TIMER, onTick);

            // Starts the clock ticking
            ticker.start();
        } /**
* Called once per second when the Timer event is received.
*/
        public function onTick(evt:TimerEvent):void
        {
         // Updates the clock display.
            face.draw();
        }
}
}
package com.example.programmingas3.simpleclock
{
 import flash.display.Shape;
 import flash.display.Sprite;
 import flash.display.StageAlign;
 import flash.display.StageScaleMode;
 import flash.text.StaticText;
 import flash.events.*;
 import flash.text.TextField;
 import flash.text.TextFormat;

/**
* Displays a round clock face with an hour hand, a minute hand, and a second hand.
*/
 public class AnalogClockFace extends Sprite
 {
/**
* The desired width of this component, as opposed to the .width
* property which represents tha actual width.
*/
public var w:uint = 200;

/**
* The desired height of this component, as opposed to the .height
* property which represents tha actual height.
*/
public var h:uint = 200;

 /**
 * The radius from the center of the clock to the
 * outer edge of the circular face outline.
 */
 public var radius:uint;

 /**
 * The coordinates of the center of the face.
 */
 public var centerX:int;
 public var centerY:int;

 /**
 * The three hands of the clock.
 */
 public var hourHand:Shape;
 public var minuteHand:Shape;
 public var secondHand:Shape;

 /**
 * The colors of the background and each hand.
 * These could be set using parameters or
 * styles in the future.
 */
 public var bgColor:uint = 0xEEEEFF;
 public var hourHandColor:uint = 0x003366;
 public var minuteHandColor:uint = 0x000099;
 public var secondHandColor:uint = 0xCC0033;

 /**
 * Stores a snapshot of the current time, so it
 * doesn't change while in the middle of drawing the
 * three hands.
 */
 public var currentTime:Date;

 /**
 * Contructs a new clock face. The width and
 * height will be equal.
 */
 public function AnalogClockFace(w:uint)
 {
this.w = w;
this.h = w;

// Rounds to the nearest pixel
this.radius = Math.round(this.w / 2);

// The face is always square now, so the
// distance to the center is the same
// horizontally and vertically
this.centerX = this.radius;
this.centerY = this.radius;
 }

 /**
 * Creates the outline, hour labels, and clock hands.
 */
 public function init():void
 {
 // draws the circular clock outline
 drawBorder();

 // draws the hour numbers
 drawLabels(); // creates the three clock hands
 createHands();
 }

 /**
 * Draws a circular border.
 */
 public function drawBorder():void
 {
 graphics.lineStyle(0.5, 0x999999);
 graphics.beginFill(bgColor);
 graphics.drawCircle(centerX, centerY, radius);
 graphics.endFill();
 }

 /**
 * Puts numeric labels at the hour points.
 */
 public function drawLabels():void
 {
 for (var i:Number = 1; i <= 12; i++)
 {
 // Creates a new TextField showing the hour number
 var label:TextField = new TextField();
 label.text = i.toString();

 // Places hour labels around the clock face.
 // The sin() and cos() functions both operate on angles in radians.
 var angleInRadians:Number = i * 30 * (Math.PI/180)

 // Place the label using the sin() and cos() functions to get the x,y coordinates.
 // The multiplier value of 0.9 puts the labels inside the outline of the clock face.
 // The integer value at the end of the equation adjusts the label position,
 // since the x,y coordinate is in the upper left corner.
 label.x = centerX + (0.9 * radius * Math.sin( angleInRadians )) - 5;
 label.y = centerY - (0.9 * radius * Math.cos( angleInRadians )) - 9;

 // Formats the label text.
 var tf:TextFormat = new TextFormat();
 tf.font = "Arial";
 tf.bold = "true";
 tf.size = 12;
 label.setTextFormat(tf);

 // Adds the label to the clock face display list.
 addChild(label);
 }
 }

 /**
 * Creates hour, minute, and second hands using the 2D drawing API.
 */
 public function createHands():void
 {
 // Uses a Shape since it's the simplest component that supports
 // the 2D drawing API.
 var hourHandShape:Shape = new Shape();
 drawHand(hourHandShape, Math.round(radius * 0.5), hourHandColor, 3.0);
 this.hourHand = Shape(addChild(hourHandShape));
 this.hourHand.x = centerX;
 this.hourHand.y = centerY;

 var minuteHandShape:Shape = new Shape();
 drawHand(minuteHandShape, Math.round(radius * 0.8), minuteHandColor, 2.0);
 this.minuteHand = Shape(addChild(minuteHandShape));
 this.minuteHand.x = centerX;
 this.minuteHand.y = centerY;

 var secondHandShape:Shape = new Shape();
 drawHand(secondHandShape, Math.round(radius * 0.9), secondHandColor, 0.5);
 this.secondHand = Shape(addChild(secondHandShape));
 this.secondHand.x = centerX;
 this.secondHand.y = centerY;
 }

 /**
 * Draws a clock hand with a given size, color, and thickness.
 */
 public function drawHand(hand:Shape, distance:uint, color:uint, thickness:Number):void
 {
 hand.graphics.lineStyle(thickness, color);
 hand.graphics.moveTo(0, distance);
 hand.graphics.lineTo(0, 0);
 }

 /**
 * Called by the parent container when the display is being drawn.
 */
 public function draw():void
 {
 // Stores the current date and time in an instance variable
 currentTime = new Date();
 showTime(currentTime);
 }

 /**
 * Displays the given Date/Time in that good old analog clock style.
 */
 public function showTime(time:Date):void
 {
 // Gets the time values
 var seconds:uint = time.getSeconds();
 var minutes:uint = time.getMinutes();
 var hours:uint = time.getHours();

 // Multiplies by 6 to get degrees
 this.secondHand.rotation = 180 + (seconds * 6);
 this.minuteHand.rotation = 180 + (minutes * 6);

 // Multiplies by 30 to get basic degrees, and then
 // adds up to 29.5 degrees (59 * 0.5) to account
 // for the minutes
 this.hourHand.rotation = 180 + (hours * 30) + (minutes * 0.5);
}
 }
}