实现服务提供者

定义 TemperatureProvider 服务提供者接口并实现 TemperatureProviderImpl 接口实现类，完成从指定文件读取天气信息的功能。

TemperatureProvider 服务提供者接口定义如下：

package com.supermap.sample.temperature;

public interface TemperatureProvider {

    public String GetTemperature(String cityName) throws Exception;

}

TemperatureProviderImpl 接口实现类代码如下：

package com.supermap.sample.temperature;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStreamReader;

import java.util.Iterator;

import java.util.LinkedList;

import com.supermap.services.components.spi.ProviderContext;

import com.supermap.services.components.spi.ProviderContextAware;

public class TemperatureProviderImpl implements TemperatureProvider, ProviderContextAware {

    private String filePath;

    public String GetTemperature(String cityName) throws Exception {

        String temperature = null;

        LinkedList<String> list = new LinkedList<String>();

        File f = new File(filePath);

        InputStreamReader isr = new InputStreamReader(new FileInputStream(f), "UTF-8");

        BufferedReader reader = new BufferedReader(isr);

        String str = null;

        while ((str = reader.readLine()) != null) {

            list.add(str);

        }

        reader.close();

        Iterator<String> it = list.iterator();

        while (it.hasNext()) {

            String strInfo = (String) it.next();

            if (strInfo.startsWith(cityName)) {

                int i = strInfo.indexOf("=");

                temperature = strInfo.substring(i + 1);

                break;

            }

        }

        if (temperature != null) {

            return temperature;

        } else {

            temperature = "没有 " + cityName + " 城市的天气信息";

            return temperature;

        }

    }

    public void setProviderContext(ProviderContext context) {

        FileSetting file = context.getConfig(FileSetting.class);

        this.filePath = file.getFilePath();

    }

}

实现 FileSetting，作为 TemperatureProvider 的配置信息，用于设置记录天气信息的文件，代码如下：

package com.supermap.sample.temperature;

public class FileSetting {

    private String filePath;

    public void setFilePath(String filePath) {

        this.filePath = filePath;

    }

    public String getFilePath() {

        return filePath;

    }

}