Question

如何获取 httpclient 请求json 参数

Answer 1

import java.io.IOException;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

/**
*
*/
public class HttpClientUtil {

public static void main(String arg[]) throws Exception {
String url = "test.com";
JSONObject params = new JSONObject();
params.put("SRC_STM_CODE", "wsf");
params.put("TENANT_ID", "123");
params.put("NM", "张三");
params.put("BRTH_DT", "1983-01-20");
params.put("GND_CODE", "1");
JSONArray params2 = new JSONArray();
JSONObject param3 = new JSONObject();
param3.put("DOC_TP_CODE", "10100");
param3.put("DOC_NBR", "100200198301202210");
param3.put("DOC_CUST_NM", "test");
params2.add(param3);
params.put("DOCS", params2);
String ret = doPost(url, params).toString();
System.out.println(ret);
}

/**
httpClient的get请求方式2
* @return
* @throws Exception
*/
public static String doGet(String url, String charset)
throws Exception {
/*
* 使用 GetMethod 来访问一个 URL 对应的网页,实现步骤: 1:生成一个 HttpClinet 对象并设置相应的参数。
* 2:生成一个 GetMethod 对象并设置响应的参数。 3:用 HttpClinet 生成的对象来执行 GetMethod 生成的Get
* 方法。 4:处理响应状态码。 5:若响应正常，处理 HTTP 响应内容。 6:释放连接。
*/
/* 1 生成 HttpClinet 对象并设置参数 */
HttpClient httpClient = new HttpClient();
// 设置 Http 连接超时为5秒
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
/* 2 生成 GetMethod 对象并设置参数 */
GetMethod getMethod = new GetMethod(url);
// 设置 get 请求超时为 5 秒
getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
// 设置请求重试处理，用的是默认的重试处理：请求三次
getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
String response = "";
/* 3 执行 HTTP GET 请求 */
try {
int statusCode = httpClient.executeMethod(getMethod);
/* 4 判断访问的状态码 */
if (statusCode != HttpStatus.SC_OK) {
System.err.println("请求出错: "+ getMethod.getStatusLine());
}
/* 5 处理 HTTP 响应内容 */
// HTTP响应头部信息，这里简单打印
Header[] headers = getMethod.getResponseHeaders();
for (Header h : headers)
System.out.println(h.getName() + "------------ " + h.getValue());
// 读取 HTTP 响应内容，这里简单打印网页内容
byte[] responseBody = getMethod.getResponseBody();// 读取为字节数组
response = new String(responseBody, charset);
System.out.println("----------response:" + response);
// 读取为 InputStream，在网页内容数据量大时候推荐使用
// InputStream response = getMethod.getResponseBodyAsStream();
} catch (HttpException e) {
// 发生致命的异常，可能是协议不对或者返回的内容有问题
System.out.println("请检查输入的URL!");
e.printStackTrace();
} catch (IOException e) {
// 发生网络异常
System.out.println("发生网络异常!");
e.printStackTrace();
} finally {
/* 6 .释放连接 */
getMethod.releaseConnection();
}
return response;
}

/**
* post请求
* @param url
* @param json
* @return
*/

public static JSONObject doPost(String url,JSONObject json){
DefaultHttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
JSONObject response = null;
try {
StringEntity s = new StringEntity(json.toString());
s.setContentEncoding("UTF-8");
s.setContentType("application/json");//发送json数据需要设置contentType
post.setEntity(s);
HttpResponse res = client.execute(post);
if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
HttpEntity entity = res.getEntity();
String result = EntityUtils.toString(res.getEntity());// 返回json格式：
response = JSONObject.fromObject(result);
}
} catch (Exception e) {
throw new RuntimeException(e);
}
return response;
}

}