服务器为URL返回了HTTP响应代码：400，我怀疑这不是URL问题 请考虑下面的java程序（servlet）。出于某种原因，我不断地在PUT和POST中遇到以下错误，其中as-GET可以在相同的httpurl中正常工作（当然还有一些小的更改，就GET而言，我不发送任何内容）

因此，我有一种感觉，这可能不是一个与URL的问题，因为它与GET的工作

我是否在发送数据时出错

我发送请求的API期望一个参数（在下面的Java代码中我的方法中是

“String Description”

）为JSON格式，如下所示 格式：

因此，我将它作为JSON发送，在下面的Java代码中

================================================================================ 我的错误（Netbeans 8.0.1上的Apache Tomcat或TomEE日志）：

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)

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);
        }
    }
}

================================================================================ 我的JAVA程序：

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)

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);
        }
    }
}

import com.google.gson.gson；
导入java.io.BufferedReader；
导入java.io.IOException；
导入java.io.InputStreamReader；
导入java.io.OutputStreamWriter；
导入java.io.PrintWriter；
导入java.net.URL；
导入java.net.URLConnection；
导入java.net.urlcoder；
导入java.sql.Date；
导入java.text.DateFormat；
导入java.text.simpleDataFormat；
导入java.util.ArrayList；
导入java.util.Calendar；
导入java.util.HashMap；
导入java.util.Iterator；
导入java.util.List；
导入java.util.Map；
导入java.util.TimeZone；
导入javax.crypto.Mac；
导入javax.crypto.spec.SecretKeySpec；
导入javax.servlet.ServletException；
导入javax.servlet.annotation.WebServlet；
导入javax.servlet.http.HttpServlet；
导入javax.servlet.http.HttpServletRequest；
导入javax.servlet.http.HttpServletResponse；
导入javax.crypto.Mac；
导入org.apache.commons.codec.binary.Hex；
导入com.sun.org.apache.xerces.internal.impl.dv.util.Base64；
@WebServlet（“/SendJSON\u PUT”）
公共类SendJSON_PUT扩展了HttpServlet{
public SendJSON_PUT（）{
超级（）；
}
受保护的void doGet（HttpServletRequest请求，HttpServletResponse响应）抛出ServletException，IOException{
setContentType（“text/html；charset=UTF-8”）；
PrintWriter out=response.getWriter（）；
试一试{
out.println（“”；//HTML5
out.println（“”）；
out.println（“”）；
//下一行是第71行
out.println（new Gson（）.toJson（ContactUpdate（“输入描述参数描述”、“{\'ID\”：\“123\”、“\'preferenceValue\”：\“检查描述！”、“Desc\”：\“123的更新描述”、“组\”：“1\”）。替换（“\\”、”）；
out.println（“说明PUT”）；
out.println（“”）；
out.println（“”）；
}   
最后{
out.close（）；//始终关闭输出写入程序
}
}
公共静态对象ContactUpdate（字符串APIDescription，字符串描述）引发IOException{
字符串accessKey=“myaccesskey”；
字符串secretKey=“myprivatekey”；
字符串uRLCppList=”http://myapichecking.mydomain.com/webservice/groupcheck";
String method=“PUT”；
java.util.Date currentTime=new java.util.Date（）；
SimpleDataFormat sdf=新的SimpleDataFormat（“EEE，dd-MMM-yyyy-HH:mm:ss z”）；
设置时区（TimeZone.getTimeZone（“GMT”）；
字符串dateTimeString=sdf.format（currentTime）；
字符串签名=generateSignature（方法、secretKey、dateTimeString）；
字符串授权=accessKey+“：”+签名；
Map params=新的HashMap（）；
参数put（“用于描述参数”，APISCRIPTION）；
参数put（“说明”，说明）；
//下面这一行是第103行
字符串[]结果=sendHttpRequest（uRLCppList，“POST”、参数、dateTimeString、授权）；
返回结果；
}
公共静态字符串[]sendHttpRequest（字符串请求URL、字符串方法、映射参数、字符串dateTimeString、字符串授权）引发IOException{
列表响应=新建ArrayList（）；
StringBuffer requestParams=新的StringBuffer（）；
if（params！=null&¶ms.size（）>0）{
迭代器paramIterator=params.keySet（）.Iterator（）；
while（parameterator.hasNext（））{
String key=paramIterator.next（）；
字符串值=params.get（键）；
append（URLEncoder.encode（键，“UTF-8”）；
requestParams.append（“=”）.append（urlcoder.encode（值，“UTF-8”）；
requestParams.append（“&”）；
}
}
URL=新URL（请求URL）；
URLConnection urlConn=url.openConnection（）；
setRequestProperty（“接受”、“应用程序/json”）；
setRequestProperty（“datetime”，dateTimeString）；
urlConn.setRequestProperty（“授权”，授权）；
urlConn.setUseCaches（false）；
//请求将返回一个响应
urlConn.setDoInput（true）；
如果（“POST”。等于（方法））{
//将请求方法设置为POST
urlConn.setDoOutput（真）；
}否则{
//设置要获取的请求方法
urlConn.setDoOutput（假）；
}
if（“POST.equals（method）&¶ms！=null&¶ms.size（）>0）{
OutputStreamWriter writer=新的OutputStreamWriter（urlConn.getOutputStream（））；
writer.write（requestParams.toString（））；
writer.flush（）；
}
//否则{
//如果（“PUT”.equals（method）&¶ms！=null&¶ms.size（）>0）{
//OutputStreamWriter writer=新的OutputStreamWriter（urlConn.getOutputStream（））；
//writer.write（requestParams.toString（））；
//writer.flush（）；
//}
//}
//读取响应，在字符串数组中逐行存储
////第