演示get、post请求如何算sn，算得sn如何使用

2023-08-04 11:23:46

  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. }
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