HttpClient基本操作

HttpClient 3.1

Get 和 Post 基本操作

public static String doGet(String url) {
        HttpClient client = new HttpClient();
        GetMethod method = new GetMethod(url);
        try {
            return executeMethod(client, method);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }

public static String doPost(String url, RequestEntity entity) {
        HttpClient client = new HttpClient();
        PostMethod method = new PostMethod(url);
        try {
            method.setRequestEntity(entity);
            return executeMethod(client, method);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

private static String executeMethod(HttpClient client, HttpMethod method) throws IOException {
        int state = client.executeMethod(method);
        StringBuilder stringBuilder = new StringBuilder();
        if (state == HttpStatus.SC_OK) {
            InputStream is = method.getResponseBodyAsStream();
            byte[] bytes = new byte[1024];
            while (is.read(bytes) != -1) {
                stringBuilder.append(new String(bytes));
            }
            return stringBuilder.toString();
        }
        return null;
    }

RequestEntity

• StringRequestEntity
• ByteArrayRequestEntity
• MultipartRequestEntity
• FileRequestEntity
• InputStreamRequestEntity

请求Content-type 为 application/x-www-form-urlencoded

        HttpClient client = new HttpClient();
        PostMethod method = new PostMethod("http://localhost:8083/type");
        method.addRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
        NameValuePair typeId = new NameValuePair("typeId","5");
        NameValuePair name = new NameValuePair("name","type1");
        NameValuePair sum = new NameValuePair("sum","500");
        NameValuePair[] pairs = {typeId,name,sum};
        method.setRequestBody(pairs);
        try {
            client.executeMethod(method);
        } catch (IOException e) {
            e.printStackTrace();
        }