带有重复参数名称的Google Volley请求 [英] Google Volley request with duplicate parameter names

问题描述

我需要发送带有重复参数名称的POST请求，例如"param = a& param = b".

I need to send a POST request with duplicate parameter names, like "param=a&param=b".

由于Map不能具有重复的键，因此无法覆盖Request.getParams()，因此只会发送一个值.

Overriding the Request.getParams() does not work since Map cannot have duplicate keys, so only one value would be sent.

我知道我可以重写Request类以使用Map或Map>，但是我想知道是否还有其他方法不需要更改库.

I know I can rewrite the Request class to use a Map or Map>, but I was wandering if there is any other way that would not require altering the library.

谢谢.

PS:我已经在凌空用户组上提出了相同的问题: https://groups.google.com/forum/#!topic/volley-users/tFRclnEbpAk

PS: I have filed the same question on the volley-users group: https://groups.google.com/forum/#!topic/volley-users/tFRclnEbpAk

推荐答案

榕树柯克帕特里克回答了我关于排球用户组的问题 ( https://groups.google.com/d/msg/volley- users/tFRclnEbpAk/uiC2f9nAIgkJ ):

Ficus Kirkpatrick answered my question on the volley-users group (https://groups.google.com/d/msg/volley-users/tFRclnEbpAk/uiC2f9nAIgkJ):

您可以重写getBody()，而无需修改库.

You can override getBody() without having to modify the library.

F

因此，我创建了以下帮助程序类:

So I created the following helper class:

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class HttpParams extends HashMap<String, List<String>> {

    private static final long serialVersionUID = 1L;

    public HttpParams() {
        super();
    }

    public HttpParams(int capacity) {
        super(capacity);
    }

    public HttpParams(Map<String, List<String>> map) {
        super(map);
    }

    public HttpParams(int capacity, float loadFactor) {
        super(capacity, loadFactor);
    }

    /*
     * This is the method to use for adding post parameters
     */
    public void add(String key, String value) {
        if (containsKey(key)) {
            get(key).add(value);
        }
        else {
            ArrayList<String> list = new ArrayList<String>();
            list.add(value);
            put(key, list);
        }
    }

    /**
     * Converts the Map into an application/x-www-form-urlencoded encoded string.
     */
    public byte[] encodeParameters(String paramsEncoding) {
        StringBuilder encodedParams = new StringBuilder();
        try {
            for (Map.Entry<String, List<String>> entry : entrySet()) {
                String key = URLEncoder.encode(entry.getKey(), paramsEncoding);
                for (String value : entry.getValue()) {
                    encodedParams.append(key);
                    encodedParams.append('=');
                    encodedParams.append(URLEncoder.encode(value, paramsEncoding));
                    encodedParams.append('&');
                }
            }
            return encodedParams.toString().getBytes(paramsEncoding);
        } catch (UnsupportedEncodingException uee) {
            throw new RuntimeException("Encoding not supported: " + paramsEncoding,     uee);
        }
    }
}

，然后在扩展Request的类中，我重写了getBody():

and then in my class that extends Request I overrided the getBody():

    @Override
    public byte[] getBody() throws AuthFailureError {
        if (mParams != null && mParams.size() > 0) {
            return mParams.encodeParameters(getParamsEncoding());
        }
        return null;
    }

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