演示get、post请求如何算sn，算得sn如何使用

作者：小丑西瓜9 | 2024-03-25 15:13:56

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java如何使用sn对post请求进行校验

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
//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
import org.apache.commons.httpclient.URIException;
import org.apache.commons.httpclient.util.URIUtil;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
public class SnTest {
public static void main(String[] args) throws Exception {
SnTest snTest = new SnTest();
snTest.testGet();
snTest.testPost();
}
public void testGet() throws Exception {
/**
* 以http://api.map.baidu.com/geocoder/v2/?address=百度大厦&output=json&ak=yourak为例
* 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，
* post请求是按字母序填充，具体参照testPost()
*/
Map paramsMap = new LinkedHashMap<String, String>();
paramsMap.put("address", "百度大厦");
paramsMap.put("output", "json");
paramsMap.put("ak", "yourak");
// 调用下面的toQueryString方法，对paramsMap内所有value作utf8编码
String paramsStr = toQueryString(paramsMap);
// 对paramsStr前面拼接上/geocoder/v2/?，后面直接拼接yoursk
String wholeStr = new String("/geocoder/v2/?" + paramsStr + "yoursk");
// 对上面wholeStr再作utf8编码
String tempStr = URLEncoder.encode(wholeStr, "UTF-8");
// 调用下面的MD5方法得到sn签名值
String sn = MD5(tempStr);
// 算得sn后发送get请求
HttpClient client = new DefaultHttpClient();
HttpGet httpget = new HttpGet(
"http://api.map.baidu.com/geocoder/v2/?address=百度大厦&output=json&ak=yourak&sn="
+ sn);
HttpResponse response = client.execute(httpget);
InputStream is = response.getEntity().getContent();
String result = inStream2String(is);
// 打印响应内容
System.out.println(result);
}
public void testPost() throws Exception {
/**
* 以http://api.map.baidu.com/geodata/v3/geotable/create创建表为例
*/
LinkedHashMap<String, String> paramsMap = new LinkedHashMap<String, String>();
paramsMap.put("geotype", "1");
paramsMap.put("ak", "yourak");
paramsMap.put("name", "geotable80");
paramsMap.put("is_published", "1");
// post请求是按字母序填充，对上面的paramsMap按key的字母序排列
Map<String, String> treeMap = new TreeMap<String, String>(paramsMap);
String paramsStr = toQueryString(treeMap);
String wholeStr = new String("/geodata/v3/geotable/create?" + paramsStr
+ "yoursk");
String tempStr = URLEncoder.encode(wholeStr, "UTF-8");
// 调用下面的MD5方法得到sn签名值
String sn = MD5(tempStr);
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(
"http://api.map.baidu.com/geodata/v3/geotable/create");
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("geotype", "1"));
params.add(new BasicNameValuePair("ak", "yourak"));
params.add(new BasicNameValuePair("name", "geotable80"));
params.add(new BasicNameValuePair("is_published", "1"));
params.add(new BasicNameValuePair("sn", sn));
HttpEntity formEntity = new UrlEncodedFormEntity(params);
post.setEntity(formEntity);
HttpResponse response = client.execute(post);
InputStream is = response.getEntity().getContent();
String result = inStream2String(is);
// 打印响应内容
System.out.println(result);
}
// 对Map内所有value作utf8编码，拼接返回结果
public String toQueryString(Map<?, ?> data)
throws UnsupportedEncodingException, URIException {
StringBuffer queryString = new StringBuffer();
for (Entry<?, ?> pair : data.entrySet()) {
queryString.append(pair.getKey() + "=");
// queryString.append(URLEncoder.encode((String) pair.getValue(),
// "UTF-8") + "&");
queryString.append(URIUtil.encodeQuery((String) pair.getValue(),
"UTF-8") + "&");
}
if (queryString.length() > 0) {
queryString.deleteCharAt(queryString.length() - 1);
}
return queryString.toString();
}
// 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
public String MD5(String md5) {
try {
java.security.MessageDigest md = java.security.MessageDigest
.getInstance("MD5");
byte[] array = md.digest(md5.getBytes());
StringBuffer sb = new StringBuffer();
for (int i = 0; i < array.length; ++i) {
sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100)
.substring(1, 3));
}
return sb.toString();
} catch (java.security.NoSuchAlgorithmException e) {
}
return null;
}
// 将输入流转换成字符串
private static String inStream2String(InputStream is) throws Exception {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int len = -1;
while ((len = is.read(buf)) != -1) {
baos.write(buf, 0, len);
}
return new String(baos.toByteArray(), "UTF-8");
}
}

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