远程调用接口

远程调用接口

// maven jar包
<dependency>
          <groupId>org.apache.httpcomponents</groupId>
          <artifactId>httpcore</artifactId>
          <version>4.4.10</version>
</dependency>
 <dependency>
          <groupId>org.apache.httpcomponents</groupId>
          <artifactId>httpclient</artifactId>
          <version>4.5.6</version>
      </dependency>

// An highlighted block
package com.datacvg.common;


import com.alibaba.fastjson.JSON;
import org.apache.http.HttpEntity;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
** 测试案例
**/
public class Http {
    
    
    public static void main(String[] args) {
    
    


        // 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 创建Post请求 
        
        HttpPost httpPost = new HttpPost("http://127.0.0.1:18080/role/selectRole");
        Map<String, String> map=new HashMap<>();
        map.put("roleId","7384c18e6549485cb5a9db0ab2fb1b62");
        // 我这里利用阿里的fastjson，将Object转换为json字符串;
        // (需要导入com.alibaba.fastjson.JSON包)
        String jsonString = JSON.toJSONString(map);

        StringEntity entity = new StringEntity(jsonString, "UTF-8");

        // post请求是将参数放在请求体里面传过去的;这里将entity放入post请求体中
        httpPost.setEntity(entity);

        httpPost.setHeader("Content-Type", "application/json;charset=utf8");

        // 响应模型
        CloseableHttpResponse response = null;
        try {
    
    
            // 由客户端执行(发送)Post请求
            response = httpClient.execute(httpPost);
            // 从响应模型中获取响应实体
            HttpEntity responseEntity = response.getEntity();

            System.out.println("响应状态为:" + response.getStatusLine());
            if (responseEntity != null) {
    
    
                System.out.println("响应内容长度为:" + responseEntity.getContentLength());
                System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
            }
        } catch (ClientProtocolException e) {
    
    
            e.printStackTrace();
        } catch (ParseException e) {
    
    
            e.printStackTrace();
        } catch (IOException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            try {
    
    
                // 释放资源
                if (httpClient != null) {
    
    
                    httpClient.close();
                }
                if (response != null) {
    
    
                    response.close();
                }
            } catch (IOException e) {
    
    
                e.printStackTrace();
            }
        }
    }


}

// 测试实例调用的接口
    @RequestMapping(value = "/selectRole",method = RequestMethod.POST)
    public HandleResultDTO getRoleById(@RequestBody Map<String,Object> jsonParams) {
    
    
        return roleService.getRoleById(jsonParams);
    }

// 工具类
package com.datacvg.common;

import com.alibaba.fastjson.JSON;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.*;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.*;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 *httpClient工具类
 */
public class HttpClientUtils {
    
    

    /**
     * <pre>
     * 方法体说明：向远程接口发起请求，返回字符串类型结果
     * @param url 接口地址
     * @param requestMethod 请求类型
     * @param params 传递参数
     * @return String 返回结果
     * </pre>
     */
    public static String httpRequestToString(String url, String requestMethod,
                                             Map<String, String> params, String ...auth){
    
    
        //接口返回结果
        String methodResult = null;
        try {
    
    
            String parameters = "";
            boolean hasParams = false;
            //将参数集合拼接成特定格式，如name=zhangsan&age=24
            for(String key : params.keySet()){
    
    
                String value = URLEncoder.encode(params.get(key), "UTF-8");
                parameters += key +"="+ value +"&";
                hasParams = true;
            }
            if(hasParams){
    
    
                parameters = parameters.substring(0, parameters.length()-1);
            }
            //是否为GET方式请求
            boolean isGet = "get".equalsIgnoreCase(requestMethod);
            boolean isPost = "post".equalsIgnoreCase(requestMethod);
            boolean isPut = "put".equalsIgnoreCase(requestMethod);
            boolean isDelete = "delete".equalsIgnoreCase(requestMethod);

            //创建HttpClient连接对象
            DefaultHttpClient client = new DefaultHttpClient();
            HttpRequestBase method = null;
            if(isGet){
    
    
                url += "?" + parameters;
                method = new HttpGet(url);
            }else if(isPost){
    
    
                method = new HttpPost(url);
                HttpPost postMethod = (HttpPost) method;
                StringEntity entity = new StringEntity(parameters);
                postMethod.setEntity(entity);
            }else if(isPut){
    
    
                method = new HttpPut(url);
                HttpPut putMethod = (HttpPut) method;
                StringEntity entity = new StringEntity(parameters);
                putMethod.setEntity(entity);
            }else if(isDelete){
    
    
                url += "?" + parameters;
                method = new HttpDelete(url);
            }
            method.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 6000);
            //设置参数内容类型
            method.addHeader("Content-Type","application/x-www-form-urlencoded");
            //httpClient本地上下文
            HttpClientContext context = null;
            if(!(auth==null || auth.length==0)){
    
    
                String username = auth[0];
                String password = auth[1];
                UsernamePasswordCredentials credt = new UsernamePasswordCredentials(username,password);
                //凭据提供器
                CredentialsProvider provider = new BasicCredentialsProvider();
                //凭据的匹配范围
                provider.setCredentials(AuthScope.ANY, credt);
                context = HttpClientContext.create();
                context.setCredentialsProvider(provider);
            }
            //访问接口，返回状态码
            HttpResponse response = client.execute(method, context);
            //返回状态码200，则访问接口成功
            if(response.getStatusLine().getStatusCode()==200){
    
    
                methodResult = EntityUtils.toString(response.getEntity());
            }
            client.close();
        }catch (UnsupportedEncodingException e) {
    
    
            e.printStackTrace();
        }catch (IOException e) {
    
    
            e.printStackTrace();
        }
        return methodResult;
    }



    public void doPostTestTwo() {
    
    

        // 获得Http客户端(可以理解为:你得先有一个浏览器;注意:实际上HttpClient与浏览器是不一样的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 创建Post请求
        HttpPost httpPost = new HttpPost("http://127.0.0.1:18080/role/selectRole");
        Map<String, String> map=new HashMap<>();
        map.put("roleId","7384c18e6549485cb5a9db0ab2fb1b62");
        // 我这里利用阿里的fastjson，将Object转换为json字符串;
        // (需要导入com.alibaba.fastjson.JSON包)
        String jsonString = JSON.toJSONString(map);

        StringEntity entity = new StringEntity(jsonString, "UTF-8");

        // post请求是将参数放在请求体里面传过去的;这里将entity放入post请求体中
        httpPost.setEntity(entity);

        httpPost.setHeader("Content-Type", "application/json;charset=utf8");

        // 响应模型
        CloseableHttpResponse response = null;
        try {
    
    
            // 由客户端执行(发送)Post请求
            response = httpClient.execute(httpPost);
            // 从响应模型中获取响应实体
            HttpEntity responseEntity = response.getEntity();

            System.out.println("响应状态为:" + response.getStatusLine());
            if (responseEntity != null) {
    
    
                System.out.println("响应内容长度为:" + responseEntity.getContentLength());
                System.out.println("响应内容为:" + EntityUtils.toString(responseEntity));
            }
        } catch (ClientProtocolException e) {
    
    
            e.printStackTrace();
        } catch (ParseException e) {
    
    
            e.printStackTrace();
        } catch (IOException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            try {
    
    
                // 释放资源
                if (httpClient != null) {
    
    
                    httpClient.close();
                }
                if (response != null) {
    
    
                    response.close();
                }
            } catch (IOException e) {
    
    
                e.printStackTrace();
            }
        }
    }


}