演示get、post请求如何算sn，算得sn如何使用

1. import java.io.ByteArrayOutputStream;
2. import java.io.InputStream;
3. import java.io.UnsupportedEncodingException;
4. import java.net.URLEncoder;
5. import java.util.ArrayList;
6. import java.util.LinkedHashMap;
7. import java.util.List;
8. import java.util.Map;
9. import java.util.Map.Entry;
10. import java.util.TreeMap;
11. //需要httpclient-x.x.jar，httpcore-x.x.jar，commons-logging-x.x.jar，commons-httpclient-x.x.jar，commons-codec-x.x.jar包发http请求
12. import org.apache.commons.httpclient.URIException;
13. import org.apache.commons.httpclient.util.URIUtil;
14. import org.apache.http.HttpEntity;
15. import org.apache.http.HttpResponse;
16. import org.apache.http.NameValuePair;
17. import org.apache.http.client.HttpClient;
18. import org.apache.http.client.entity.UrlEncodedFormEntity;
19. import org.apache.http.client.methods.HttpGet;
20. import org.apache.http.client.methods.HttpPost;
21. import org.apache.http.impl.client.DefaultHttpClient;
22. import org.apache.http.message.BasicNameValuePair;
23. public class SnTest {
24. public static void main(String[] args) throws Exception {
25. SnTest snTest = new SnTest();
26. snTest.testGet();
27. snTest.testPost();
28. }
29. public void testGet() throws Exception {
30. /**
31. * 以http://api.map.baidu.com/geocoder/v2/?address=百度大厦&output=json&ak=yourak为例
32. * ak设置了sn校验不能直接使用必须在url最后附上sn值，get请求计算sn跟url中参数对出现顺序有关，需按序填充paramsMap，
33. * post请求是按字母序填充，具体参照testPost()
34. */
35. Map paramsMap = new LinkedHashMap<String, String>();
36. paramsMap.put("address", "百度大厦");
37. paramsMap.put("output", "json");
38. paramsMap.put("ak", "yourak");
39. // 调用下面的toQueryString方法，对paramsMap内所有value作utf8编码
40. String paramsStr = toQueryString(paramsMap);
41. // 对paramsStr前面拼接上/geocoder/v2/?，后面直接拼接yoursk
42. String wholeStr = new String("/geocoder/v2/?" + paramsStr + "yoursk");
43. // 对上面wholeStr再作utf8编码
44. String tempStr = URLEncoder.encode(wholeStr, "UTF-8");
45. // 调用下面的MD5方法得到sn签名值
46. String sn = MD5(tempStr);
47. // 算得sn后发送get请求
48. HttpClient client = new DefaultHttpClient();
49. HttpGet httpget = new HttpGet(
50. "http://api.map.baidu.com/geocoder/v2/?address=百度大厦&output=json&ak=yourak&sn="
51. + sn);
52. HttpResponse response = client.execute(httpget);
53. InputStream is = response.getEntity().getContent();
54. String result = inStream2String(is);
55. // 打印响应内容
56. System.out.println(result);
57. }
58. public void testPost() throws Exception {
59. /**
60. * 以http://api.map.baidu.com/geodata/v3/geotable/create创建表为例
61. */
62. LinkedHashMap<String, String> paramsMap = new LinkedHashMap<String, String>();
63. paramsMap.put("geotype", "1");
64. paramsMap.put("ak", "yourak");
65. paramsMap.put("name", "geotable80");
66. paramsMap.put("is_published", "1");
67. // post请求是按字母序填充，对上面的paramsMap按key的字母序排列
68. Map<String, String> treeMap = new TreeMap<String, String>(paramsMap);
69. String paramsStr = toQueryString(treeMap);
70. String wholeStr = new String("/geodata/v3/geotable/create?" + paramsStr
71. + "yoursk");
72. String tempStr = URLEncoder.encode(wholeStr, "UTF-8");
73. // 调用下面的MD5方法得到sn签名值
74. String sn = MD5(tempStr);
75. HttpClient client = new DefaultHttpClient();
76. HttpPost post = new HttpPost(
77. "http://api.map.baidu.com/geodata/v3/geotable/create");
78. List<NameValuePair> params = new ArrayList<NameValuePair>();
79. params.add(new BasicNameValuePair("geotype", "1"));
80. params.add(new BasicNameValuePair("ak", "yourak"));
81. params.add(new BasicNameValuePair("name", "geotable80"));
82. params.add(new BasicNameValuePair("is_published", "1"));
83. params.add(new BasicNameValuePair("sn", sn));
84. HttpEntity formEntity = new UrlEncodedFormEntity(params);
85. post.setEntity(formEntity);
86. HttpResponse response = client.execute(post);
87. InputStream is = response.getEntity().getContent();
88. String result = inStream2String(is);
89. // 打印响应内容
90. System.out.println(result);
91. }
92. // 对Map内所有value作utf8编码，拼接返回结果
93. public String toQueryString(Map<?, ?> data)
94. throws UnsupportedEncodingException, URIException {
95. StringBuffer queryString = new StringBuffer();
96. for (Entry<?, ?> pair : data.entrySet()) {
97. queryString.append(pair.getKey() + "=");
98. // queryString.append(URLEncoder.encode((String) pair.getValue(),
99. // "UTF-8") + "&");
100. queryString.append(URIUtil.encodeQuery((String) pair.getValue(),
101. "UTF-8") + "&");
102. }
103. if (queryString.length() > 0) {
104. queryString.deleteCharAt(queryString.length() - 1);
105. }
106. return queryString.toString();
107. }
108. // MD5计算方法，调用了MessageDigest库函数，并把byte数组结果转换成16进制
109. public String MD5(String md5) {
110. try {
111. java.security.MessageDigest md = java.security.MessageDigest
112. .getInstance("MD5");
113. byte[] array = md.digest(md5.getBytes());
114. StringBuffer sb = new StringBuffer();
115. for (int i = 0; i < array.length; ++i) {
116. sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100)
117. .substring(1, 3));
118. }
119. return sb.toString();
120. } catch (java.security.NoSuchAlgorithmException e) {
121. }
122. return null;
123. }
124. // 将输入流转换成字符串
125. private static String inStream2String(InputStream is) throws Exception {
126. ByteArrayOutputStream baos = new ByteArrayOutputStream();
127. byte[] buf = new byte[1024];
128. int len = -1;
129. while ((len = is.read(buf)) != -1) {
130. baos.write(buf, 0, len);
131. }
132. return new String(baos.toByteArray(), "UTF-8");
133. }
134. }