HTTP请求远端String和byte[]数据

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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。