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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編易做图 
            } 
        } 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狀態易做图是否為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 ,
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