请在下面考虑我的JAVA程序（Servlet）。出于某种原因，我继续为PUT和POST获取以下错误，因为GET在相同的HTTP URL下正常工作（当然，在GET方面我没有发送任何内容的一些小的改动）。
因此，我感觉网址可能不是问题，因为它正在使用GET。
我发送数据时出错了吗？
我发送请求的API是期望一个参数（下面的Java代码中我的方法中的"String Description"）采用JSON的形式，并在下面
格式：
[
{
"ID": "-1",
"Value": "value",
"Desc": "description",
"Group": "1"
},
{
"Id": "-1",
"Value": "value2",
"Desc": "description2",
"Group": "1"
}
]
因此我将其作为JSON发送到下面的Java代码中。
=============================================== ================================= 我的错误（Apache Tomcat或Tombe登录Netbeans 8.0.1）：
02-Oct-2014 09:24:38.787 SEVERE [http-apr-8080-exec-34] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [SendJSON_PUT] in context with path [/testapi] threw exception
java.io.IOException: Server returned HTTP response code: 400 for URL:http://myapichecking.mydomain.com/webservice/groupcheck
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1838)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1439)
at SendJSON_PUT.sendHttpRequest(SendJSON_PUT.java:157) // I have mentioned about line 157,103 & 71 in the code below
at SendJSON_PUT.ContactUpdate(SendJSON_PUT.java:103)
at SendJSON_PUT.doGet(SendJSON_PUT.java:71)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:526)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:655)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2381)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2370)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
=============================================== ================================= 我的JAVA计划：
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.sql.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.crypto.Mac;
import org.apache.commons.codec.binary.Hex;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
@WebServlet("/SendJSON_PUT")
public class SendJSON_PUT extends HttpServlet {
public SendJSON_PUT() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<!DOCTYPE html>"); // HTML 5
out.println("<html><head>");
out.println("<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>");
// THE BELOW LINE IS LINE # 71
out.println(new Gson().toJson(ContactUpdate("The Input Description Parameter Description","{\"ID\":\"123\",\"preferenceValue\":\"Check Description !\",\"Desc\":\"Update Description for 123\",\"Group\":\"1\"}")).replace("\\",""));
out.println("<head><title>Description PUT</title></head>");
out.println("<body>");
out.println("</body></html>");
}
finally {
out.close(); // Always close the output writer
}
}
public static Object ContactUpdate(String APIDescription,String Description) throws IOException {
String accessKey = "myaccesskey";
String secretKey = "myprivatekey";
String uRLCppList = "http://myapichecking.mydomain.com/webservice/groupcheck";
String method = "PUT";
java.util.Date currentTime = new java.util.Date();
SimpleDateFormat sdf = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z");
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
String dateTimeString = sdf.format(currentTime);
String signature = generateSignature(method, secretKey, dateTimeString);
String authorization = accessKey + ":" + signature;
Map<String, String> params = new HashMap<String, String>();
params.put("For Description parameter", APIDescription);
params.put("The Description", Description);
// THIS BELOW LINE IS LINE #103
String[] result = sendHttpRequest(uRLCppList, "POST", params, dateTimeString, authorization);
return result;
}
public static String[] sendHttpRequest(String requestUrl, String method, Map<String, String> params, String dateTimeString, String authorization) throws IOException {
List<String> response = new ArrayList<String>();
StringBuffer requestParams = new StringBuffer();
if (params != null && params.size() > 0) {
Iterator<String> paramIterator = params.keySet().iterator();
while (paramIterator.hasNext()) {
String key = paramIterator.next();
String value = params.get(key);
requestParams.append(URLEncoder.encode(key, "UTF-8"));
requestParams.append("=").append(URLEncoder.encode(value, "UTF-8"));
requestParams.append("&");
}
}
URL url = new URL(requestUrl);
URLConnection urlConn = url.openConnection();
urlConn.setRequestProperty("accept", "application/json");
urlConn.setRequestProperty("datetime", dateTimeString);
urlConn.setRequestProperty("authorization", authorization);
urlConn.setUseCaches(false);
// the request will return a response
urlConn.setDoInput(true);
if ("POST".equals(method)) {
// set request method to POST
urlConn.setDoOutput(true);
} else {
// set request method to GET
urlConn.setDoOutput(false);
}
if ("POST".equals(method) && params != null && params.size() > 0) {
OutputStreamWriter writer = new OutputStreamWriter(urlConn.getOutputStream());
writer.write(requestParams.toString());
writer.flush();
}
//else {
//if ("PUT".equals(method) && params != null && params.size() > 0) {
// OutputStreamWriter writer = new OutputStreamWriter(urlConn.getOutputStream());
// writer.write(requestParams.toString());
//writer.flush();
//}
//}
// reads response, store line by line in an array of Strings
// // THIS BELOW LINE IS LINE # 157
BufferedReader reader = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
String line = "";
while ((line = reader.readLine()) != null) {
response.add(line);
}
reader.close();
return (String[]) response.toArray(new String[0]);
}
public static String generateSignature(String method, String secretKey, String dateTimeString) {
String cs = String.format("%s\n\n\n%s\n\n\n", method, dateTimeString);
String signature = createSignature(cs, secretKey);
return signature;
}
public static String createSignature(String stringIn, String scretKey) {
String fixedData = stringIn.replace('\n', (char)10);
// Calculate the hash of the information
String digest = hmacSha1(scretKey, fixedData);
return digest;
}
public static String hmacSha1(String key, String value) {
try {
// Get an hmac_sha1 key from the raw key bytes
byte[] keyBytes = key.getBytes("iso-8859-1");
SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1");
// Get an hmac_sha1 Mac instance and initialize with the signing key
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(signingKey);
// Compute the hmac on input data bytes
byte[] rawHmac = mac.doFinal(value.getBytes("iso-8859-1"));
// Covert array of Hex bytes to a String
return Base64.encode(rawHmac);
//return new String(hexBytes, "UTF-8");
}
catch (Exception e) {
throw new RuntimeException(e);
}
}
}
由于