HttpURLConnection發送+而不是空間

Question

我想發送http post請求到某個服務器，並且參數包含空格以及一些特殊字符。以下是我的代碼：

public static String HttpPost(String[] paramName, String[] paramVal) 
{ 
    try{ 
    String parameters = null; 
    if ((paramName != null) && (paramVal != null)) 
    { 
     parameters = paramName[0] +"="+ paramVal[0]; 
     for (int i = 1; i < paramName.length; i++) 
     { 
      parameters+= "&"; 
      parameters += URLEncoder.encode(paramName[i], "US-ASCII") + "=" + URLEncoder.encode(paramVal[i], "utf-8"); 
     } 
    } 
    //parameters = URLEncoder.encode(parameters, "utf-8"); 
    byte[] postData = parameters.getBytes(StandardCharsets.US_ASCII); 
    int postDataLength = postData.length; 
    FolderManager fm = new FolderManager(); 
    String urlStr = FolderManager.ApplicationUnderTestUrl(); 
    URL url = new URL(urlStr); 
    HttpURLConnection conn= (HttpURLConnection) url.openConnection();   
    conn.setDoOutput(true); 
    conn.setInstanceFollowRedirects(false); 
    conn.setRequestMethod("POST"); 

    //con.setRequestProperty("Content-Type", "application/json; charset=utf-8"); 
    conn.setRequestProperty("Accept", "application/x-www-form-urlencoded; charset=US-ASCII"); 
    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=US-ASCII"); 
    conn.setRequestProperty("charset", "US-ASCII"); 
    conn.setRequestProperty("Accept-Encoding", "identity"); 
    conn.setRequestProperty("Content-Length", Integer.toString(postDataLength)); 
    conn.setUseCaches(false); 
    try(DataOutputStream wr = new DataOutputStream(conn.getOutputStream())) { 

     wr.write(postData); 
     //System.out.print(postData); 
    } 
    String line; 
    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); 

    while ((line = reader.readLine()) != null) { 
     System.out.println(line); 
     return line; 
    } 

    reader.close(); 
    return line; 
    }catch(Exception e) 
    { 
     return e.getMessage(); 
    } 
} 

上面的代碼發送特殊字符，但它會發送'+'符號，以便在params中有一個空格。我如何避免這種情況？

Answer 1

我得到它的工作。這是什麼幫助：

if ((paramName != null) && (paramVal != null)) 
    { 
     parameters = paramName[0] +"="+ paramVal[0]; 
     URLEncoder.encode(parameters, "UTF-8").replace("+", "%20"); 
     for (int i = 1; i < paramName.length; i++) 
     { 
      parameters+= "&"; 
      parameters += URLEncoder.encode(paramName[i], "UTF-8").replace("+", "%20") + "=" + URLEncoder.encode(paramVal[i], "UTF-8").replace("+", "%20"); 
      //parameters += paramName[i] + "=" + paramVal[i]; 
     } 
    } 

希望它可以幫助你以某種方式。