android - http删除tomcat 403错误

Question

我试图从我的 android 应用程序中删除存储在 tomcat 的 webapps 目录中的图像。当我尝试下面的代码时，它给了我 403 状态代码。我在网上查了一下，发现如果请求合法但操作被禁止，它会给出该代码。谁能告诉我哪里出错了。我的代码是:

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("DELETE");
int responseCode = connection.getResponseCode();

当我尝试使用 HttpClient 时，它给了我同样的错误 - HTTP/1.1 403 Forbidden

HttpClient httpClient = new DefaultHttpClient();
                  try {
                    httpClient.getParams().setParameter(
                            "http.socket.timeout", new Integer(90000));
                    HttpDelete delete = new HttpDelete(new URI(
                            "http://192.168.2.1:9090/LocationUpdaterServlet/images/"
                                    + userid));
                    Toast.makeText(Image.this, "Removing your picture", 5000).show();
                    HttpResponse response = httpClient.execute(delete);
                    if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
                        System.out.println(response.getStatusLine());
                    } else {
                        // Here every thing is fine.
                    }
                    HttpEntity resEntity = response.getEntity();
                    if (resEntity == null)
                        System.out
                                .println("---------Error No Response !!!-----");
                }catch (Exception ex) {
                    System.out.println("---------Error----"+ ex.getMessage());
                    ex.printStackTrace();
                } finally {
                    httpClient.getConnectionManager().shutdown();

                }

Answer 1

在 web.xml 中，启用其他 http 方法:

<servlet>
    <servlet-name>default</servlet-name>
    <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
    <init-param>
        <param-name>debug</param-name>
        <param-value>0</param-value>
    </init-param>
    <init-param>
        <param-name>listings</param-name>
        <param-value>false</param-value>
    </init-param>
    <init-param>
        <param-name>readonly</param-name>
        <param-value>false</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

参数debug和listings是tomcat默认加载的，而默认的readonly为true，表示只有GET和POST可用.

其他可用的参数是:

     debug               Debugging detail level for messages logged                              by this servlet.  [0]                               fileEncoding        Encoding to be used to read static resources                            [platform default]                                  input               Input buffer size (in bytes) when reading                               resources to be served.  [2048]                     listings            Should directory listings be produced if there                          is no welcome file in this directory?  [false]                          WARNING: Listings for directories with many                             entries can be slow and may consume                                     significant proportions of server resources.        output              Output buffer size (in bytes) when writing                              resources to be served.  [2048]                     readonly            Is this context "read only", so HTTP                                    commands like PUT and DELETE are                                        rejected?  [true]                                   readmeFile          File to display together with the directory                             contents. [null]                                    sendfileSize        If the connector used supports sendfile, this                           represents the minimal file size in KB for                              which sendfile will be used. Use a negative                             value to always disable sendfile.  [48]             useAcceptRanges     Should the Accept-Ranges header be included                             in responses where appropriate? [true]