怎么在Java中实现一个Http工具类？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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http工具类的实现：（通过apache包）第一个类
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.util.EntityUtils;
import com.gooagoo.stcu.utils.http.HttpClientUtils;
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 = HttpClientUtils.getHttpClient();
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;
}
}第二个类的实现：
package com.demo.http;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
public class HttpClientUtils {
private static final int REQUEST_TIMEOUT = 5 * 1000;// 设置请求超时10秒钟
private static final int SO_TIMEOUT = 10 * 1000; // 设置等待数据超时时间10秒钟
// static ParseXml parseXML = new ParseXml();
// 初始化HttpClient，并设置超时
public static HttpClient getHttpClient() {
BasicHttpParams httpParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParams, REQUEST_TIMEOUT);
HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT);
HttpClient client = new DefaultHttpClient(httpParams);
return client;
}
public static boolean doPost(String url) throws Exception {
HttpClient client = getHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response;
response = client.execute(httppost);
if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {
return true;
}
client.getConnectionManager().shutdown();
return false;
}
/**
* 与远程交互的返回值post方式
*
* @param hashMap
* @param url
* @return
*/
public static String getHttpXml(HashMap hashMap, String url) {
String responseMsg = "";
HttpPost request = new HttpPost(url);
List params = new ArrayList();
Iterator> iter = hashMap.entrySet()
.iterator();
while (iter.hasNext()) {
Entry entry = iter.next();
params.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
try {
request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpClient client = HttpClientUtils.getHttpClient();
HttpResponse response = client.execute(request);
if (response.getStatusLine().getStatusCode() == 200) {
responseMsg = EntityUtils.toString(response.getEntity());
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return responseMsg;
}
/**
* map转字符串 拼接参数
*
* @param hashMap
* @return
*/
public static String mapToString(HashMap hashMap) {
String parameStr = "";
Iterator> iter = hashMap.entrySet()
.iterator();
while (iter.hasNext()) {
Entry entry = iter.next();
parameStr += "&" + entry.getKey() + "=" + entry.getValue();
}
if (parameStr.contains("&")) {
parameStr = parameStr.replaceFirst("&", "?");
}
return parameStr;
}
} 看完上述内容是否对您有帮助呢？如果还想对相关知识有进一步的了解或阅读更多相关文章，请关注创新互联行业资讯频道，感谢您对创新互联的支持。