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Java 为什么HTTP POST返回代码400（错误请求）？HTTP POST方法

java http post gwt

Java 为什么HTTP POST返回代码400（错误请求）？HTTP POST方法,java,http,post,gwt,Java,Http,Post,Gwt,为什么服务器返回响应代码400（错误请求）？（不起作用） /** Creating Connection **/ URL serverAddress = new URL(uri); HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection(); connection.setDoOutput(true)

为什么服务器返回响应代码400（错误请求）？（不起作用）

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
例如，此HTTP GET返回代码200:（工作）

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
错误400。您没有向我们显示您试图请求的URI，但是很可能URI只接受GET请求，并且无法响应POST请求，因此它会抛出400错误。例如，使用GET请求一个显示照片列表的页面是有意义的，但是向所述页面发出POST请求则毫无意义

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
另一种可能是您提供的内容类型不正确。通常，在发出POST请求时，您希望使用
application/x-www-form-urlencoded
，这是在internet上提交任何web表单时使用的内容类型。此外，您可能没有提供服务器所需的表单数据。想象一个场景，你试图在Facebook上发布一条消息，但没有提供任何消息。服务器将正确地拒绝您的空请求

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
如果您向我们提供您正在使用的请求URI和内容类型，我们可以帮助您进一步调试此文件。

错误400。您没有向我们显示您试图请求的URI，但是很可能URI只接受GET请求，并且无法响应POST请求，因此它会抛出400错误。例如，使用GET请求一个显示照片列表的页面是有意义的，但是向所述页面发出POST请求则毫无意义

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
另一种可能是您提供的内容类型不正确。通常，在发出POST请求时，您希望使用
application/x-www-form-urlencoded
，这是在internet上提交任何web表单时使用的内容类型。此外，您可能没有提供服务器所需的表单数据。想象一个场景，你试图在Facebook上发布一条消息，但没有提供任何消息。服务器将正确地拒绝您的空请求

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
如果您向我们提供您正在使用的请求URI和内容类型，我们可以帮助您进一步调试。

查看合作伙伴呼叫的文档。get操作显示所有伙伴，post操作需要设置一个主体。您没有在代码中发送正文，因此您发送了一个错误的请求

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
请看这里：vs

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }

查看合作伙伴电话的文档。get操作显示所有伙伴，post操作需要设置一个主体。您没有在代码中发送正文，因此您发送了一个错误的请求

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
请看这里：vs

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }

在我实际写入流并关闭流之前，我尝试获取响应代码（connection.getResponseCode（））（writer.write（）和os.close（）），这就是服务器返回错误请求代码（400）的原因。 
            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
这是我现在可以使用的代码：

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
在我实际写入流并关闭流之前，我尝试获取响应代码（connection.getResponseCode（））（writer.write（）和os.close（）），这就是服务器返回错误请求代码（400）的原因。 这是我现在可以使用的代码：

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }
在我的例子中，我的URL字符串中有一个空格。我用%20替换了它，它成功了

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }

    requestUrl = requestUrl.replace(" ", "%20");
在我的例子中，我的URL字符串中有一个空格。我用%20替换了它，它成功了

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }

    requestUrl = requestUrl.replace(" ", "%20");
对我来说，它是在我为POST请求设置outputStream值之前从inputStream读取的。我将
os.write（）…
部分移到了
OutputSteam os=…

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }

String body = "\"key\": \"value\"";
StringBuilder stringBuilder = new StringBuilder();

OutputStream os = conn.getOutputStream();
try {
    byte[] input = body.getBytes("utf-8");
    os.write(input, 0, input.length);           
} catch(Exception ex) {
    ex.printStackTrace();
}

BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"))
try {
    String line = null;

    while ((line= br.readLine()) != null) {
        stringBuilder.append(line.trim());
    }
} catch(Exception ex) {
    ex.printStackTrace();
}
对我来说，它是在我为POST请求设置outputStream值之前从inputStream读取的。我将
os.write（）…
部分移到了
OutputSteam os=…

            /** Creating Connection **/
            URL serverAddress = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) serverAddress.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestProperty("Content-Type", contentType);
            connection.setRequestMethod("POST");

            /** POSTing **/
            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery());
            writer.flush();
            writer.close();
            os.close();
            connection.connect();

            int status = connection.getResponseCode();//this cannot be invoked before data stream is ready when performing HTTP POST
            PrinterClass.show(status);  //status
            if (status != 200)
                throw (new RESTfulWebServiceException("Invalid HTTP response status "
                    + "code " + status + " from web service server."));

private String getQuery() throws UnsupportedEncodingException
    {
        JSONObject jobj = new JSONObject();
        jobj.put("customerNumber", new JSONString("003"));
        jobj.put("mappingCode", new JSONString("jac_003"));
        jobj.put("name", new JSONString("johnny"));
        jobj.put("status", new JSONString("ACTIVE"));
        PrinterClass.show(jobj.toString());
        return jobj.toString();
    }

String body = "\"key\": \"value\"";
StringBuilder stringBuilder = new StringBuilder();

OutputStream os = conn.getOutputStream();
try {
    byte[] input = body.getBytes("utf-8");
    os.write(input, 0, input.length);           
} catch(Exception ex) {
    ex.printStackTrace();
}

BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"))
try {
    String line = null;

    while ((line= br.readLine()) != null) {
        stringBuilder.append(line.trim());
    }
} catch(Exception ex) {
    ex.printStackTrace();
}
在这两种情况下（post和get），我都使用：contentType=“application/json”uri=“nwb.sys.stage cf billing.swisslab.io/com.swisscom.nwb.cf.api/v1/partner”文档说明我可以使用所需的POSTS内容长度？可能我试图过早获取响应代码？（在答复之前）。有没有http程序可以让我检查它们是否可以发布？在这两种情况下（发布和获取），我都使用：contentType=“application/json”uri=“nwb.sys.stage cf billing.swisslab.io/com.swisscom.nwb.cf.api/v1/partner”文档说我可以使用所需的POSTS内容长度？也许我试图获取响应代码太早了？（在答复之前）。有没有http程序，我可以检查他们是否可以发布？非常感谢你的提示。你能告诉我怎样才能做到这一点吗？检查我的编辑，我已经添加了writer.write（json）；现在一切都很好。感谢thsts和gtklocker为您提供的宝贵时间！！不客气，如果你认为答案是正确的，请接受。我怎样才能在发帖后得到“回复体”？？它在json{msg:“someMSG”代码中：“错误请求”}connection.getInputStream（）返回IOException connection.getResponseMessage（）和connection.getResponseCode（）可以工作，但我需要打印的信息还不够。非常感谢您的提示。你能告诉我怎样才能做到这一点吗？检查我的编辑，我已经添加了writer.write（json）；现在一切都很好。感谢thsts和gtklocker为您提供的宝贵时间！！不客气，如果你认为答案是正确的，请接受。我怎样才能在发帖后得到“回复体”？？它在json{msg:“someMSG”代码中：“错误请求”}connection.getInputStream（）返回IOException connection.getResponseMessage（）和connection.getResponseCode（）可以正常工作，但我需要打印的信息不够多，有同样的问题！谢谢你澄清原因。谢谢，我也有同样的问题，现在已经解决了。你能解释一下为什么会发生这种情况吗？400表示请求的格式不正确。换句话说，客户端发送到服务器的数据流没有遵循规则（在本例中，这是正确的，因为没有定义POST）！谢谢你澄清原因