java里模拟http请求

早准备写这个了，因为java里模拟http请求的场景太多了，经常写，每次都百度粘贴。一直想自己完完整整写一个http工具，很多东西又不太明白说不好，现在写接口采用postman，结合着用，以及以前写前端，利用浏览器控制台去调试，稍微对这一块有了一点点认识，现在去写这个，感觉稍微有点自然了。
自己的准备工作 http://www.jianshu.com/p/a94ce2c0200b

Spring Boot里的maven依赖除了web的，还主要用了httpclient这个依赖，基于这个jar也还算方便，代码量不多的

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.3</version>
        </dependency>

先看一下Httppost

下面这是简单的Post请求的demo

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class MyHttpUtils {
    private static void doMyPostConfig(HttpRequestBase httpRequestBase, String headToken) {
        //设置报文的请求头
        httpRequestBase.setHeader("Accept","application/json");
        httpRequestBase.setHeader("Accept-Encoding", "gzip, deflate");
        httpRequestBase.setHeader("Accept-Language", "zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3");//"en-US,en;q=0.5");
        httpRequestBase.setHeader("Accept-Charset", "ISO-8859-1,utf-8,gbk,gb2312;q=0.7,*;q=0.7");
        httpRequestBase.setHeader("Authorization",headToken);//我不太知道接受是怎么处理的，我遇到过接口过滤，别人通过这个自定义head做过滤条件
        httpRequestBase.setHeader("Content-Type","application/json");
        // 配置请求的超时设置
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectionRequestTimeout(1000*60)
                .setConnectTimeout(1000*60)
                .setSocketTimeout(1000*60)
                .build();
        httpRequestBase.setConfig(requestConfig);
    }

    public static boolean doMyPost(String website, Map<String,Object> param, String headToken) throws IOException {
        CloseableHttpClient aDefault = HttpClients.createDefault();
        HttpPost request = new HttpPost(website);
        doMyPostConfig(request,headToken);
        String jsonStr = JSON.toJSONString(param);
        //传参是json时这样处理（postman对应raw）
        request.setEntity(new StringEntity(jsonStr));

        //传key-value键值对的时候，传参就用Map<String,String> param 代码如下注释这样写
        /*
        List<NameValuePair> nvps = new ArrayList<NameValuePair>();
        if(param != null && !param.isEmpty()){
            Iterator<Map.Entry<String, String>> iter = param.entrySet().iterator();
            while(iter.hasNext()){
                Map.Entry<String, String> next = iter.next();
                nvps.add(new BasicNameValuePair(next.getKey(), next.getValue()));
            }
        }
        request.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
        */
        CloseableHttpResponse execute = aDefault.execute(request);
        Boolean result = false;
        if(execute.getStatusLine().getStatusCode() == 200){
            result = true;
            //返回是json时这样处理 比如下面这种情况
            String str = EntityUtils.toString(execute.getEntity());
            JSONObject jsonObject = JSON.parseObject(str);
            Integer resultCode = (Integer) jsonObject.get("code");
            if (resultCode == 200){//这里处理返回成功那边json中就带有一个code 200 是表示那边正常处理
                result = true;
            }
        }
        return result;
    }

}