HTTP请求字符串/字节数组资源

Java代码
package lizhen.http;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

public class HTTPRequest {

    private String errorMessage; //錯誤信息

    /**
     * HTTP請求字符串資源
     * @param url URL地址
     * @return 字符串資源
     * */
    public String httpRequestString(String url) {
        String result = null;
        try {
            HttpEntity httpEntity = httpRequest(url);
            if(httpEntity != null) {
                result = EntityUtils.toString(httpEntity, "urf-8"); //使用UTF-8編碼
            }
        } catch (IOException e) {
            errorMessage = e.getMessage();
        }
        return result;
    }

    /**
     * HTTP請求字節數組資源
     * @param url URL地址
     * @return 字節數組資源
     * */
    public byte[] httpRequestByteArray(String url) {
        byte[] result = null;
        try {
            HttpEntity httpEntity = httpRequest(url);
            if(httpEntity != null) {
                result = EntityUtils.toByteArray(httpEntity);
            }
        } catch (IOException e) {
            errorMessage = e.getMessage();
        }
        return result;
    }

    /**
     * 使用HTTP GET方式請求
     * @param url URL地址
     * @return HttpEntiry對象
     * */
    private HttpEntity httpRequest(String url) {
        HttpEntity result = null;
        try {
            HttpGet httpGet = new HttpGet(url);
            HttpClient httpClient = new DefaultHttpClient();
            HttpResponse httpResponse;
            httpResponse = httpClient.execute(httpGet);
            int httpStatusCode = httpResponse.getStatusLine().getStatusCode();
            /*
             * 判斷HTTP狀態碼是否為200
             * */
            if(httpStatusCode == HttpStatus.SC_OK) {
                result = httpResponse.getEntity();
            } else {
                errorMessage = "HTTP: "+httpStatusCode;
            }
        } catch (ClientProtocolException e) {
            errorMessage = e.getMessage();
        } catch (IOException e) {
            errorMessage = e.getMessage();
        }
        return result;
    }

    /**
     * 返回錯誤消息
     * @return 錯誤信息
     * */
    public String getErrorMessage() {
        return this.errorMessage;
    }

}

示例代码使用HTTP Get方式请求远端资源。
httpRequestString方法适用于请求XML/JSON等文本资源。
httpRequestByteArray方法适用于请求图片/音乐等二进制资源。
当返回值为null时，调用getErrorMessage方法返回错误信息。

作者“Dyingbleed”

补充：移动开发 , Android ,