HttpClient 2_post method

b) port method : 看完 get method 後, 其實 post method 大同小異, 差別在於物件不同而已.

public PostDemo { 

    public static void main (String[] args) throws Exception {
        HttpClient client = new HttpClient();
        PostMethod method = new PostMethod("http://www.google.com.tw");
        int httpcode = client.executeMethod(method); // 執行
        if (httpcode == HttpStatus.SC_OK) {
            System.out.println("連線成功");
        } else {
            System.out.println("連線失敗");
        }
      
        // 用完記得關閉
        method.releaseConnection();
    }
}

取得結果 :

    ...
    if (httpcode == HttpStatus.SC_OK) {
        System.out.println("連線成功");
        // 取得結果有幾種方法, 
        // 1. method.getResponseBodyAsString() , 測試用的話沒關係, 但量大會造成效能不佳, 也不建議使用
        // 2. method.getResponseBodyAsStream()
        InputStream in = method.getResponseBodyAsStream();
       
        // 自己轉換成 String
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        StringBuilder result = new StringBuilder();
        String temp = null;
        while ((temp = reader.readLine()) != null) {
            result.append(temp);
        }
        // 這樣就能將做後續的處理囉...
    }
    ...

其它參數

    PostMethod method = new PostMethod(yourUrl);
    // add parameters
    method.addParameter("parameterName", "parameterValue");
    // ... 如果有一個以上
        
    // post image file
    Part[] parts = { new StringPart("param1", "我是小胖"),
                     new StringPart("param2", "體重65"),
                     new StringPart("param3", "這 2 天變曬黑了"),
                     new FilePart("personalPic", new File("D:\\小胖照片.jpg")) };

    method.setRequestEntity(new MultipartRequestEntity(parts, method
                    .getParams()));

Post & Get 這 2 個方法應該可以滿足很多需求, 下一篇將介紹其它的 config 如何設定, 如 add header, set timeout, retry handler, multi thread ...等.