首先，我们新建一个类，存放天气信息

/*

* Created on 2005-3-8

*

* To change the template for this generated file go to

* Window>Preferences>Java>Code Generation>Code and Comments

*/

package

org.exoplatform.portlets.chinaweather.component;

/**

*

@author

Administrator

*

* To change the template for this generated type comment go to

* Window>Preferences>Java>Code Generation>Code and Comments

*/

public

class

Weather {

private

String city;

private

String state;

private

String temperature;

private

String time;

private

String wind;

private

String windpower;

private

long

UpdateTime;

/**

*

@return

*/

public

String getTemperature() {

return

temperature;

}

/**

*

@return

*/

public

String getTime() {

return

time;

}

/**

*

@return

*/

public

String getWind() {

return

wind;

}

/**

*

@return

*/

public

String getWindpower() {

return

windpower;

}

/**

*

@param

string

*/

public

void

setTemperature(String string) {

temperature

=

string;

}

/**

*

@param

string

*/

public

void

setTime(String string) {

time

=

string;

}

/**

*

@param

string

*/

public

void

setWind(String string) {

wind

=

string;

}

/**

*

@param

string

*/

public

void

setWindpower(String string) {

windpower

=

string;

}

/**

*

@return

*/

public

long

getUpdateTime() {

return

UpdateTime;

}

/**

*

@param

l

*/

public

void

setUpdateTime(

long

l) {

UpdateTime

=

l;

}

/**

*

@return

*/

public

String getState() {

return

state;

}

/**

*

@param

string

*/

public

void

setState(String string) {

state

=

string;

}

/**

*

@return

*/

public

String getCity() {

return

city;

}

/**

*

@param

string

*/

public

void

setCity(String string) {

city

=

string;

}

}

具体的解析代码为:

private

Weather parserWeather()

throws

Exception {

Weather w

=

new

Weather();

try

{

//

Parser parser =

//

new Parser("file:

//

localhost/I:/projects/query.html");

Parser parser

=

new

Parser(

"

http://weather.news.sohu.com/query.php?city=镇江

"

);

parser.setEncoding(

"

GBK

"

);

Node nodes[]

=

parser.extractAllNodesThatAre(TableTag.

class

);

TableTag table

=

(TableTag) nodes[

3

];

//

temperature

StringNode[] stringNodes

=

table.digupStringNode(

"

镇江

"

);

StringNode name

=

stringNodes[

0

];

w.setCity(name.toPlainTextString());

CompositeTag td

=

(CompositeTag) name.getParent();

CompositeTag tr

=

(CompositeTag) td.getParent();

int

columnNo

=

tr.findPositionOf(td);

TableColumn nextColumn

=

(TableColumn) tr.childAt(

5

);

Node expectedName

=

nextColumn.childAt(

0

);

Node expectedName2

=

nextColumn.childAt(

2

);

//

System.out.println(expectedName.getText());

//

System.out.println(expectedName2.getText());

w.setState(expectedName.getText());

w.setTemperature(expectedName2.getText());

//

time

stringNodes

=

table.digupStringNode(

"

时间

"

);

name

=

stringNodes[

0

];

//

System.out.println(name.toPlainTextString());

String time

=

name

.toPlainTextString()

.substring(

4

, name.toPlainTextString().length())

.trim();

//

System.out.println(time);

w.setTime(time);

//

wind

stringNodes

=

table.digupStringNode(

"

风向

"

);

name

=

stringNodes[

0

];

//

System.out.println(name.toPlainTextString());

String wind

=

name

.toPlainTextString()

.substring(

4

, name.toPlainTextString().length())

.trim();

//

System.out.println(wind);

w.setWind(wind);

//

wind power

stringNodes

=

table.digupStringNode(

"

风力

"

);

name

=

stringNodes[

0

];

//

System.out.println(name.toPlainTextString());

String windpower

=

name

.toPlainTextString()

.substring(

4

, name.toPlainTextString().length())

.trim();

//

System.out.println(windpower);

w.setWindpower(windpower);

w.setUpdateTime(System.currentTimeMillis());

}

catch

(ParserException e) {

e.printStackTrace();

}

return

w;

}

解析出来的代码必须做缓存处理，

private

static

long

TIME_TO_LIVE

=

1000

*

60

*

60

*

12

;

private

Weather loadWeather()

throws

Exception {

Weather weather

=

weather

=

(Weather) cache_.get(

"

chinaweather

"

);

long

currentTime

=

System.currentTimeMillis();

if

(weather

!=

null

&&

currentTime

<

(weather.getUpdateTime()

+

TIME_TO_LIVE)) {

cache_.remove(

"

chinaweather

"

);

weather

=

null

;

}

if

(weather

==

null

) {

synchronized

(cache_) {

weather

=

parserWeather();

cache_.put(

"

chinaweather

"

, weather);

}

}

return

weather;

}