Exception in thread "main" java.lang.IllegalArgumentException: Illegal character in query at index x

HttpClient:

超文本傳輸​​協定（HTTP）可能是當今網際網路上使用的最重要的協定。Web服務，啟用網絡的裝置和網絡計算的增長繼續擴充了HTTP協定在使用者驅動的Web浏覽器之外的作用，同時增加了需要HTTP支援的應用程式的數量。

Exception in thread "main" java.lang.IllegalArgumentException: Illegal character in query at indexxx. 在請求第三方接口時發生了如下錯誤，并且參數格式都是正确的，通過翻閱一些資料，定位是請求前進行編碼。

代碼如下：

public static String post(String url , Map params) throws Exception {
        //String encode = URLEncoder.encode(JSON.toJSONString(params),"UTF-8");
        HttpClient client = HttpClients.createDefault();
        HttpPost httppost = new HttpPost(new StringBuilder().append(url+JSON.toJSONString(params).toString());
        logger.info(String.format("URI:%s",httppost.getURI()));
        HttpResponse res = client.execute(httppost);
        String result ="";
        HttpEntity entity = res.getEntity();
        if (entity != null)
            result = EntityUtils.toString(entity, "UTF-8");
        return result;
    }
           

錯誤：Exception in thread "main" java.lang.IllegalArgumentException: Illegal character in query at index 6.....

原因：參數需要編碼後然後發送請求，完整代碼如下：

public static String post(String url , Map params) throws Exception {
        String encode = URLEncoder.encode(JSON.toJSONString(params),"UTF-8");
        HttpClient client = HttpClients.createDefault();
        HttpPost httppost = new HttpPost(new StringBuilder().append(url+encode).toString());
        logger.info(String.format("URI:%s",httppost.getURI()));
        HttpResponse res = client.execute(httppost);
        String result ="";
        HttpEntity entity = res.getEntity();
        if (entity != null)
            result = EntityUtils.toString(entity, "UTF-8");
        return result;
    }
           

編碼後的參數列印在控制台了：URI:http://xxxx:8080/testmethod=test&params=%7B%22vo%22%3A%7B%22shownum%22%3A

由于太長以上copy了一部分。

還有一種方式來請求：

URI uri = new URIBuilder()  
        .setScheme("http")  
        .setHost("www.google.com")  
        .setPath("/search")  
        .setParameter("q", "httpclient")  
        .setParameter("btnG", "Google Search")  
        .build();  
HttpGet httpget = new HttpGet(uri);  
           

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