由于项目中要用，所以找了一些资料，整理下来。
GitHub地址: https://github.com/iamyong 转自：http://blog.csdn.net/capmiachael/article/details/51833531
例1：使用 HttpClient （commons-httpclient-3.0.jar
1 import java.io.ByteArrayInputStream;
2 import java.io.ByteArrayOutputStream;
3 import java.io.IOException;
4 import java.io.InputStream;
5
6 import org.apache.commons.httpclient.HttpClient;
7 import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
8 import org.apache.commons.httpclient.methods.PostMethod;
9 import org.apache.commons.httpclient.methods.RequestEntity;
10
11 public class HttpTool {
12
13 /**
14 * 发送post请求
15 *
16 * @param params
17 * 参数
18 * @param requestUrl
19 * 请求地址
20 * @param authorization
21 * 授权书
22 * @return 返回结果
23 * @throws IOException
24 */
25 public static String sendPost(String params, String requestUrl,
26 String authorization) throws IOException {
27
28 byte[] requestBytes = params.getBytes("utf-8"); // 将参数转为二进制流
29 HttpClient httpClient = new HttpClient();// 客户端实例化
30 PostMethod postMethod = new PostMethod(requestUrl);
31 //设置请求头Authorization
32 postMethod.setRequestHeader("Authorization", "Basic " + authorization);
33 // 设置请求头 Content-Type
34 postMethod.setRequestHeader("Content-Type", "application/json");
35 InputStream inputStream = new ByteArrayInputStream(requestBytes, 0,
36 requestBytes.length);
37 RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,
38 requestBytes.length, "application/json; charset=utf-8"); // 请求体
39 postMethod.setRequestEntity(requestEntity);
40 httpClient.executeMethod(postMethod);// 执行请求
41 InputStream soapResponseStream = postMethod.getResponseBodyAsStream();// 获取返回的流
42 byte[] datas = null;
43 try {
44 datas = readInputStream(soapResponseStream);// 从输入流中读取数据
45 } catch (Exception e) {
46 e.printStackTrace();
47 }
48 String result = new String(datas, "UTF-8");// 将二进制流转为String
49 // 打印返回结果
50 // System.out.println(result);
51
52 return result;
53
54 }
55
56 /**
57 * 从输入流中读取数据
58 *
59 * @param inStream
60 * @return
61 * @throws Exception
62 */
63 public static byte[] readInputStream(InputStream inStream) throws Exception {
64 ByteArrayOutputStream outStream = new ByteArrayOutputStream();
65 byte[] buffer = new byte[1024];
66 int len = 0;
67 while ((len = inStream.read(buffer)) != -1) {
68 outStream.write(buffer, 0, len);
69 }
70 byte[] data = outStream.toByteArray();
71 outStream.close();
72 inStream.close();
73 return data;
74 }
75 }
例2：
1 import java.io.BufferedReader;
2 import java.io.IOException;
3 import java.io.InputStream;
4 import java.io.InputStreamReader;
5 import java.io.OutputStreamWriter;
6 import java.io.UnsupportedEncodingException;
7 import java.net.HttpURLConnection;
8 import java.net.InetSocketAddress;
9 import java.net.Proxy;
10 import java.net.URL;
11 import java.net.URLConnection;
12 import java.util.List;
13 import java.util.Map;
14
15 /**
16 * Http请求工具类
17 */
18 public class HttpRequestUtil {
19 static boolean proxySet = false;
20 static String proxyHost = "127.0.0.1";
21 static int proxyPort = 8087;
22 /**
23 * 编码
24 * @param source
25 * @return
26 */
27 public static String urlEncode(String source,String encode) {
28 String result = source;
29 try {
30 result = java.net.URLEncoder.encode(source,encode);
31 } catch (UnsupportedEncodingException e) {
32 e.printStackTrace();
33 return "0";
34 }
35 return result;
36 }
37 public static String urlEncodeGBK(String source) {
38 String result = source;
39 try {
40 result = java.net.URLEncoder.encode(source,"GBK");
41 } catch (UnsupportedEncodingException e) {
42 e.printStackTrace();
43 return "0";
44 }
45 return result;
46 }
47 /**
48 * 发起http请求获取返回结果
49 * @param req_url 请求地址
50 * @return
51 */
52 public static String httpRequest(String req_url) {
53 StringBuffer buffer = new StringBuffer();
54 try {
55 URL url = new URL(req_url);
56 HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
57
58 httpUrlConn.setDoOutput(false);
59 httpUrlConn.setDoInput(true);
60 httpUrlConn.setUseCaches(false);
61
62 httpUrlConn.setRequestMethod("GET");
63 httpUrlConn.connect();
64
65 // 将返回的输入流转换成字符串
66 InputStream inputStream = httpUrlConn.getInputStream();
67 InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
68 BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
69
70 String str = null;
71 while ((str = bufferedReader.readLine()) != null) {
72 buffer.append(str);
73 }
74 bufferedReader.close();
75 inputStreamReader.close();
76 // 释放资源
77 inputStream.close();
78 inputStream = null;
79 httpUrlConn.disconnect();
80
81 } catch (Exception e) {
82 System.out.println(e.getStackTrace());
83 }
84 return buffer.toString();
85 }
86
87 /**
88 * 发送http请求取得返回的输入流
89 * @param requestUrl 请求地址
90 * @return InputStream
91 */
92 public static InputStream httpRequestIO(String requestUrl) {
93 InputStream inputStream = null;
94 try {
95 URL url = new URL(requestUrl);
96 HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
97 httpUrlConn.setDoInput(true);
98 httpUrlConn.setRequestMethod("GET");
99 httpUrlConn.connect();
100 // 获得返回的输入流
101 inputStream = httpUrlConn.getInputStream();
102 } catch (Exception e) {
103 e.printStackTrace();
104 }
105 return inputStream;
106 }
107
108
109 /**
110 * 向指定URL发送GET方法的请求
111 *
112 * @param url
113 * 发送请求的URL
114 * @param param
115 * 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
116 * @return URL 所代表远程资源的响应结果
117 */
118 public static String sendGet(String url, String param) {
119 String result = "";
120 BufferedReader in = null;
121 try {
122 String urlNameString = url + "?" + param;
123 URL realUrl = new URL(urlNameString);
124 // 打开和URL之间的连接
125 URLConnection connection = realUrl.openConnection();
126 // 设置通用的请求属性
127 connection.setRequestProperty("accept", "*/*");
128 connection.setRequestProperty("connection", "Keep-Alive");
129 connection.setRequestProperty("user-agent",
130 "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
131 // 建立实际的连接
132 connection.connect();
133 // 获取所有响应头字段
134 Map<String, List<String>> map = connection.getHeaderFields();
135 // 遍历所有的响应头字段
136 for (String key : map.keySet()) {
137 System.out.println(key + "--->" + map.get(key));
138 }
139 // 定义 BufferedReader输入流来读取URL的响应
140 in = new BufferedReader(new InputStreamReader(
141 connection.getInputStream()));
142 String line;
143 while ((line = in.readLine()) != null) {
144 result += line;
145 }
146 } catch (Exception e) {
147 System.out.println("发送GET请求出现异常！" + e);
148 e.printStackTrace();
149 }
150 // 使用finally块来关闭输入流
151 finally {
152 try {
153 if (in != null) {
154 in.close();
155 }
156 } catch (Exception e2) {
157 e2.printStackTrace();
158 }
159 }
160 return result;
161 }
162
163 /**
164 * 向指定 URL 发送POST方法的请求
165 *
166 * @param url
167 * 发送请求的 URL
168 * @param param
169 * 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
170 * @param isproxy
171 * 是否使用代理模式
172 * @return 所代表远程资源的响应结果
173 */
174 public static String sendPost(String url, String param,boolean isproxy) {
175 OutputStreamWriter out = null;
176 BufferedReader in = null;
177 String result = "";
178 try {
179 URL realUrl = new URL(url);
180 HttpURLConnection conn = null;
181 if(isproxy){//使用代理模式
182 @SuppressWarnings("static-access")
183 Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
184 conn = (HttpURLConnection) realUrl.openConnection(proxy);
185 }else{
186 conn = (HttpURLConnection) realUrl.openConnection();
187 }
188 // 打开和URL之间的连接
189
190 // 发送POST请求必须设置如下两行
191 conn.setDoOutput(true);
192 conn.setDoInput(true);
193 conn.setRequestMethod("POST"); // POST方法
194
195
196 // 设置通用的请求属性
197
198 conn.setRequestProperty("accept", "*/*");
199 conn.setRequestProperty("connection", "Keep-Alive");
200 conn.setRequestProperty("user-agent",
201 "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
202 conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
203
204 conn.connect();
205
206 // 获取URLConnection对象对应的输出流
207 out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
208 // 发送请求参数
209 out.write(param);
210 // flush输出流的缓冲
211 out.flush();
212 // 定义BufferedReader输入流来读取URL的响应
213 in = new BufferedReader(
214 new InputStreamReader(conn.getInputStream()));
215 String line;
216 while ((line = in.readLine()) != null) {
217 result += line;
218 }
219 } catch (Exception e) {
220 System.out.println("发送 POST 请求出现异常！"+e);
221 e.printStackTrace();
222 }
223 //使用finally块来关闭输出流、输入流
224 finally{
225 try{
226 if(out!=null){
227 out.close();
228 }
229 if(in!=null){
230 in.close();
231 }
232 }
233 catch(IOException ex){
234 ex.printStackTrace();
235 }
236 }
237 return result;
238 }
239
240 public static void main(String[] args) {
241 //demo:代理访问
242 String url = "http://api.adf.ly/api.php";
243 String para = "key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com";
244
245 String sr=HttpRequestUtil.sendPost(url,para,true);
246 System.out.println(sr);
247 }
248
249 }
例3
1 /**
2 * 发送Http post请求
3 *
4 * @param xmlInfo
5 * json转化成的字符串
6 * @param URL
7 * 请求url
8 * @return 返回信息
9 */
10 public static String doHttpPost(String xmlInfo, String URL) {
11 System.out.println("发起的数据:" + xmlInfo);
12 byte[] xmlData = xmlInfo.getBytes();
13 InputStream instr = null;
14 java.io.ByteArrayOutputStream out = null;
15 try {
16 URL url = new URL(URL);
17 URLConnection urlCon = url.openConnection();
18 urlCon.setDoOutput(true);
19 urlCon.setDoInput(true);
20 urlCon.setUseCaches(false);
21 urlCon.setRequestProperty("content-Type", "application/json");
22 urlCon.setRequestProperty("charset", "utf-8");
23 urlCon.setRequestProperty("Content-length",
24 String.valueOf(xmlData.length));
25 System.out.println(String.valueOf(xmlData.length));
26 DataOutputStream printout = new DataOutputStream(
27 urlCon.getOutputStream());
28 printout.write(xmlData);
29 printout.flush();
30 printout.close();
31 instr = urlCon.getInputStream();
32 byte[] bis = IOUtils.toByteArray(instr);
33 String ResponseString = new String(bis, "UTF-8");
34 if ((ResponseString == null) || ("".equals(ResponseString.trim()))) {
35 System.out.println("返回空");
36 }
37 System.out.println("返回数据为:" + ResponseString);
38 return ResponseString;
39
40 } catch (Exception e) {
41 e.printStackTrace();
42 return "0";
43 } finally {
44 try {
45 out.close();
46 instr.close();
47
48 } catch (Exception ex) {
49 return "0";
50 }
51 }
52 }
时间： 2024-10-11 11:49:06