HTTPClient 使用-白红宇

HTTPClient 使用

阅读量：6513 次

发布时间：2019-06-24

本文共 4745 字，大约阅读时间需要 15 分钟。

所需jar

<groupId>org.apache.httpcomponents</groupId>

<artifactId>httpclient</artifactId>

</dependency>

<groupId>org.apache.httpcomponents</groupId>

<artifactId>httpclient</artifactId>

</dependency>

<groupId>org.apache.httpcomponents</groupId>

<artifactId>httpcore</artifactId>

</dependency>

<groupId>org.apache.httpcomponents</groupId>

<artifactId>httpmime</artifactId>

</dependency>

<groupId>org.apache.httpcomponents</groupId>

<artifactId>fluent-hc</artifactId>

</dependency>

java调用方法

package com.zc.finance.menu;

import java.io.Console;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.client.methods.HttpUriRequest;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.util.EntityUtils;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import com.alibaba.fastjson.JSON;

import com.sun.org.apache.xerces.internal.impl.xpath.regex.ParseException;

import com.zc.common.BaseController;

import com.zc.finance.resoruce.domain.Role;

public class MenuController extends BaseController {

/**

* 导航栏

public String url12="";

@RequestMapping(value = "/role/addRole")

public void getHttpClientUpdateRole(String url, Map<String, String> params,

HttpServletResponse response,HttpServletRequest request, Role model) {

String role = JSON.toJSONString(model);

request.getParameter("roleName");

String url1 = url12

params.put("role", role);

String str = post(url1, params);

response.setContentType("text/html;charset=utf-8");

try {

response.getWriter().write(str);

response.getWriter().flush();

response.getWriter().close();

} catch (IOException e) {

e.printStackTrace();

}

//return str;

}

public String post(String url, Map<String, String> params) {

DefaultHttpClient httpclient = new DefaultHttpClient();

String body = null;

// log.info("create httppost:" + url);

HttpPost post = postForm(url, params);

body = invoke(httpclient, post);

httpclient.getConnectionManager().shutdown();

return body;

}

public String get(String url) {

DefaultHttpClient httpclient = new DefaultHttpClient();

String body = null;

// log.info("create httppost:" + url);

HttpGet get = new HttpGet(url);

body = invoke(httpclient, get);

httpclient.getConnectionManager().shutdown();

return body;

}

private String invoke(DefaultHttpClient httpclient, HttpUriRequest httpost) {

HttpResponse response = sendRequest(httpclient, httpost);

String body = paseResponse(response);

return body;

}

private String paseResponse(HttpResponse response) {

String body = null;

// log.info("get response from http server..");

HttpEntity entity = response.getEntity();

// log.info("response status: " + response.getStatusLine());

String charset = EntityUtils.getContentCharSet(entity);

// log.info(charset);

try {

body = EntityUtils.toString(entity);

// log.info(body);

} catch (ParseException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

/**

* 判断返回数据类型是否是json格式的，是说明请求成功，不是说明用户未登陆或登陆超时

try {

JSON.parse(body);

} catch (Exception e) {

body = "用户未登陆或登陆超时！";

e.printStackTrace();

}

return body;

}

private HttpResponse sendRequest(DefaultHttpClient httpclient,

HttpUriRequest httpost) {

// log.info("execute post...");

HttpResponse response = null;

try {

response = httpclient.execute(httpost);

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return response;

}

private HttpPost postForm(String url, Map<String, String> params) {

HttpPost httpost = new HttpPost(url);

List<NameValuePair> nvps = new ArrayList<NameValuePair>();

Set<String> keySet = params.keySet();

for (String key : keySet) {

nvps.add(new BasicNameValuePair(key, params.get(key)));

}

try {

// log.info("set utf-8 form entity to httppost");

httpost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return httpost;

}

转载于:https://my.oschina.net/u/1430510/blog/298623

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