java.io.IOException:服务器返回URL的HTTP响应代码：405_Java_Ios_Servlets

java.io.IOException:服务器返回URL的HTTP响应代码：405

java ios servlets

java.io.IOException:服务器返回URL的HTTP响应代码：405,java,ios,servlets,Java,Ios,Servlets,我有一个在线servlet，我正试图联系它，以便进行一些基本的测试。以下是servlet代码： import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.h

我有一个在线servlet，我正试图联系它，以便进行一些基本的测试。以下是servlet代码：

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class index extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public index() {
        super();
    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        long time1 = System.currentTimeMillis();
        long time2 = time1 + 10000;
        out.println(time1);
        long i = 400000000l;
            while (System.currentTimeMillis() < time2) {
                i++;
            }
            out.print(time2);
    }
}

然而，我一直得到相同的405错误。我做错了什么？

您看到的是

HttpServlet

的默认实现

doPost（）

，因为您没有

在索引中覆盖它
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException
{
    String protocol = req.getProtocol();
    String msg = lStrings.getString("http.method_post_not_supported");
    if (protocol.endsWith("1.1")) {
        resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, msg);
    } else {
        resp.sendError(HttpServletResponse.SC_BAD_REQUEST, msg);
    }
}

它会立即发送405响应
这是因为您调用
conn.getOutputStream()

这使得URLConnection
默认情况下认为您发送的是POST
，而不是预期的GET
。您甚至没有使用OutputStream
那么为什么要打开它，然后flush（）
它，再也不使用它了
wr = new OutputStreamWriter(conn.getOutputStream());
wr.flush();

您还可以检查请求方法是GET还是POST：
private static final int READ_TIMEOUT = 100000;
private static final int CONNECT_TIMEOUT = 150000;
public static final String POST = "POST";
public static final String GET = "GET";
public static final String PUT = "PUT";
public static final String DELETE = "DELETE";
public static final String HEAD = "HEAD";
private URL url = null;
private HttpURLConnection  conn = null;
private OutputStream os = null;
private BufferedWriter writer = null;
private InputStream is = null;
private int responseCode = 0;

private String request(String method, String url, List<NameValuePair> params) throws IOException {

    if(params != null && method == GET){
        url = url.concat("?");
        url = url.concat(getQuery(params));
    }

    this.url = new URL(url);
    conn = (HttpURLConnection) this.url.openConnection();
    conn.setReadTimeout(READ_TIMEOUT);
    conn.setConnectTimeout(CONNECT_TIMEOUT);
    conn.setRequestMethod(method);
    conn.setDoInput(true);
    conn.setDoOutput(true);

    if(params != null && method == POST){
        os = conn.getOutputStream();
        writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
        writer.write(getQuery(params));
        writer.flush();
        writer.close();
        os.close();
    }

    conn.connect();
    responseCode = conn.getResponseCode();
    is = conn.getInputStream();
    String contentAsString = getStringFromInputStream(is);
    return contentAsString;
}



private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
    StringBuilder result = new StringBuilder();
    boolean first = true;

    for (NameValuePair pair : params){

        if (first){
            first = false;
        } else {
            result.append("&");
        }
        result.append(URLEncoder.encode(pair.getName(),"UTF-8"));
        result.append("=");
        result.append(URLEncoder.encode(pair.getValue(),"UTF-8"));
    }

    return result.toString();
}

private static final int READ\u TIMEOUT=100000；
专用静态最终int CONNECT_超时=150000；
公共静态最终字符串POST=“POST”；
公共静态最终字符串GET=“GET”；
公共静态最终字符串PUT=“PUT”；
公共静态最终字符串DELETE=“DELETE”；
公共静态最终字符串HEAD=“HEAD”；
私有URL=null；
私有HttpURLConnection conn=null；
私有输出流os=null；
private BufferedWriter=null；
私有InputStream为空；
私有int响应代码=0；
私有字符串请求（字符串方法、字符串url、列表参数）引发IOException{
if（params！=null&&method==GET）{
url=url.concat（“？”）；
url=url.concat（getQuery（params））；
}
this.url=新url（url）；
conn=（HttpURLConnection）this.url.openConnection（）；
conn.setReadTimeout（读取超时）；
连接设置连接超时（连接超时）；
conn.setRequestMethod（方法）；
conn.setDoInput（真）；
连接设置输出（真）；
if（params！=null&&method==POST）{
os=conn.getOutputStream（）；
writer=new BufferedWriter（新的OutputStreamWriter（os，“UTF-8”））；
write（getQuery（params））；
writer.flush（）；
writer.close（）；
os.close（）；
}
连接（）；
responseCode=conn.getResponseCode（）；
is=conn.getInputStream（）；
字符串contentAsString=getStringFromInputStream（is）；
返回contentAsString；
}
私有字符串getQuery（列表参数）引发UnsupportedEncodingException{
StringBuilder结果=新建StringBuilder（）；
布尔值优先=真；
for（NameValuePair对：params）{
如果（第一）{
第一个=假；
}否则{
结果。追加（&）；
}
append（URLEncoder.encode（pair.getName（），“UTF-8”）；
结果。追加（“=”）；
append（URLEncoder.encode（pair.getValue（），“UTF-8”）；
}
返回result.toString（）；
}

private static final int READ_TIMEOUT = 100000;
private static final int CONNECT_TIMEOUT = 150000;
public static final String POST = "POST";
public static final String GET = "GET";
public static final String PUT = "PUT";
public static final String DELETE = "DELETE";
public static final String HEAD = "HEAD";
private URL url = null;
private HttpURLConnection  conn = null;
private OutputStream os = null;
private BufferedWriter writer = null;
private InputStream is = null;
private int responseCode = 0;

private String request(String method, String url, List<NameValuePair> params) throws IOException {

    if(params != null && method == GET){
        url = url.concat("?");
        url = url.concat(getQuery(params));
    }

    this.url = new URL(url);
    conn = (HttpURLConnection) this.url.openConnection();
    conn.setReadTimeout(READ_TIMEOUT);
    conn.setConnectTimeout(CONNECT_TIMEOUT);
    conn.setRequestMethod(method);
    conn.setDoInput(true);
    conn.setDoOutput(true);

    if(params != null && method == POST){
        os = conn.getOutputStream();
        writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
        writer.write(getQuery(params));
        writer.flush();
        writer.close();
        os.close();
    }

    conn.connect();
    responseCode = conn.getResponseCode();
    is = conn.getInputStream();
    String contentAsString = getStringFromInputStream(is);
    return contentAsString;
}



private String getQuery(List<NameValuePair> params) throws UnsupportedEncodingException {
    StringBuilder result = new StringBuilder();
    boolean first = true;

    for (NameValuePair pair : params){

        if (first){
            first = false;
        } else {
            result.append("&");
        }
        result.append(URLEncoder.encode(pair.getName(),"UTF-8"));
        result.append("=");
        result.append(URLEncoder.encode(pair.getValue(),"UTF-8"));
    }

    return result.toString();
}