一、項目框架
首先我使用的框架是spring boot
我使用的是maven pom的方式導入的OKHttp,pom如下。另外解析結果有使用到fastjson,一併給出
<!-- OKHttp3依賴 -->
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>3.8.1</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.31</version>
</dependency>
二、請求工具
然後我就爲了更方便的使用,我就封裝了一個網絡請求的工具類
package com.bittel.scene.util;
import com.alibaba.fastjson.JSONObject;
import okhttp3.*;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
/**
* 網絡請求工具類
*
* @author ZYT
* @date 2020年 02月19日 16:18:43
*/
public class HttpUtils {
/**
* 發送一個get請求
*
* @param url 請求地址
* @param params 請求參數,按照a=b的形式拼接的參數
* @return 請求結果 字符串
*/
public static String get(String url, String params) {
try {
System.out.println(url + "?" + params);
OkHttpClient client = new OkHttpClient().newBuilder()
.build();
Request request = new Request.Builder()
.url(url + "?" + params)
.get()
.build();
Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
return response.body().string();
} else {
throw new IOException("Unexpected code " + response);
}
} catch (IOException e) {
e.printStackTrace();
return "";
}
}
/**
* 發送一個get請求
*
* @param url 請求地址
* @param params 請求參數,map集合
* @return 請求返回字符串
*/
public static String get(String url, Map<String, String> params) {
return get(url, mapToRequestString(params));
}
/**
* 發起一個get請求
*
* @param url 請求地址
* @param params 請求參數,map集合
* @param clazz 返回對象類型
* @param <T> 返回對象類型
* @return 根據傳入的類型返回出解析後的對象
*/
public static <T> T get(String url, Map<String, String> params, Class<T> clazz) {
return JSONObject.parseObject(get(url, mapToRequestString(params)), clazz);
}
/**
* 發起一個POST請求
*
* @param url 請求地址
* @param params 請求參數
* @return 返回請求結果字符串
* @throws IOException 異常處理
*/
public static String postForm(String url, Map<String, String> params) throws IOException {
OkHttpClient client = new OkHttpClient().newBuilder()
.build();
MultipartBody.Builder requestBodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM);
for (String key : params.keySet()) {
requestBodyBuilder.addFormDataPart(key, params.get(key));
}
RequestBody body = requestBodyBuilder.build();
Request request = new Request.Builder()
.url(url)
.method("POST", body)
.build();
Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
return response.body().string();
} else {
throw new IOException("Unexpected code " + response);
}
}
/**
* 發起一個POST請求
*
* @param url 請求地址
* @param params 請求參數map集合
* @param classz 返回對象類型
* @param <T> 返回對象類型
* @return 返回傳入的對象類型,實際就是將返回結果用fastJson 轉成對象
* @throws IOException 異常冒泡
*/
public static <T> T postForm(String url, Map<String, String> params, Class<T> classz) throws IOException {
return JSONObject.parseObject(postForm(url, params), classz);
}
/**
* 發起一個POST請求,請求體爲json
* @param url 請求url
* @param params 請求參數
* @return 返回結果字符串
* @throws IOException 異常冒泡
* @throws NullPointerException 異常冒泡
*/
public static String postJSON(String url, Map<String, String> params) throws IOException, NullPointerException {
OkHttpClient client = new OkHttpClient().newBuilder()
.build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, JSONObject.toJSONString(params));
Request request = new Request.Builder()
.url(url)
.method("POST", body)
.addHeader("Content-Type", "application/json")
.build();
Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
return response.body().string();
} else {
throw new IOException("Unexpected code " + response);
}
}
public static <T> T postJSON(String url, Map<String, String> params, Class<T> clazz) throws IOException, NullPointerException {
return JSONObject.parseObject(postJSON(url, params), clazz);
}
private static String mapToRequestString(Map<String, String> paramMap) {
StringBuilder paramString = new StringBuilder();
Iterator<String> keys = paramMap.keySet().iterator();
while (keys.hasNext()) {
String key = keys.next();
paramString.append(key);
paramString.append("=");
paramString.append(paramMap.get(key));
if (keys.hasNext()) {
paramString.append("&");
}
}
return paramString.toString();
}
}
三、使用方式:
public static void main(String[] args) {
String url = "http://www.baidu.com/s";
Map<String,String> paramMap = new LinkedHashMap<>();
paramMap.put("wd","測試");
String res = HttpUtils.get(url,paramMap);
}