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本文出自【赵彦军的博客】

在插件开发过程中，我们按照开发一个正式的项目来操作，需要整理一些常用工具类。

Http 请求封装

在插件的项目中，我们看到依赖库如下图所示：

• 在依赖包中，我们可以看到插件中是用了 httpClient 作为 http 底层连接库，做过 Android 开发的同学对 httpClient 库应该很熟悉，在早期的Android开发中，我们都用 httpClient 做 http 请求，后来被Android 废弃了。

• 另外，在这里的 Json 解析用的 Gson , 是谷歌官方出品的 Json 解析框架。

下面我们总结一个 HttpManager 以满足日常的插件开发需求，HttpManager 目前满足的功能有

• Get 请求

HttpManager.getInstance().get(String url) ;HttpManager.getInstance().get(String url, Map<String, String> params) ;

• Post 请求

HttpManager.getInstance().post(String url, Map<String, String> requestParams) ;

• 下载文件

HttpManager.getInstance().downloadFile(String url, String destFileName);

如果我们需要其他的网络服务，可以自行搜索 Httpclient 的其他功能。

HttpManager 源码如下所示：

package com.http;import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;import java.io.*;
import java.net.URI;
import java.net.URLEncoder;
import java.util.*;public class HttpManager {private static HttpManager ourInstance = new HttpManager();public static HttpManager getInstance() {return ourInstance;}private HttpManager() {}/*** POST请求** @param url* @param requestParams* @return* @throws Exception*/public String post(String url, Map<String, String> requestParams) throws Exception {String result = null;CloseableHttpClient httpClient = HttpClients.createDefault();/**HttpPost*/HttpPost httpPost = new HttpPost(url);List params = new ArrayList();Iterator<Map.Entry<String, String>> it = requestParams.entrySet().iterator();while (it.hasNext()) {Map.Entry<String, String> en = it.next();String key = en.getKey();String value = en.getValue();if (value != null) {params.add(new BasicNameValuePair(key, value));}}httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));/**HttpResponse*/CloseableHttpResponse httpResponse = httpClient.execute(httpPost);try {HttpEntity httpEntity = httpResponse.getEntity();result = EntityUtils.toString(httpEntity, "utf-8");EntityUtils.consume(httpEntity);} finally {try {if (httpResponse != null) {httpResponse.close();}} catch (IOException e) {e.printStackTrace();}}return result;}/*** GET 请求** @param url* @param params* @return*/public String get(String url, Map<String, String> params) {return get(getUrlWithQueryString(url, params));}/*** Get 请求** @param url* @return*/public String get(String url) {CloseableHttpClient httpCient = HttpClients.createDefault();HttpGet httpGet = new HttpGet();httpGet.setURI(URI.create(url));String result = null;//第三步：执行请求，获取服务器发还的相应对象CloseableHttpResponse httpResponse = null;try {httpResponse = httpCient.execute(httpGet);if (httpResponse.getStatusLine().getStatusCode() == 200) {HttpEntity entity = httpResponse.getEntity();String response = EntityUtils.toString(entity, "utf-8");//将entity当中的数据转换为字符串result = response.toString();}} catch (IOException e) {e.printStackTrace();} finally {if (httpResponse != null) {try {httpResponse.close();} catch (IOException e) {e.printStackTrace();}}}return result;}/*** 根据api地址和参数生成请求URL** @param url* @param params* @return*/private String getUrlWithQueryString(String url, Map<String, String> params) {if (params == null) {return url;}StringBuilder builder = new StringBuilder(url);if (url.contains("?")) {builder.append("&");} else {builder.append("?");}int i = 0;for (String key : params.keySet()) {String value = params.get(key);if (value == null) { //过滤空的keycontinue;}if (i != 0) {builder.append('&');}builder.append(key);builder.append('=');builder.append(encode(value));i++;}return builder.toString();}/*** 下载文件** @param url* @param destFileName* @throws ClientProtocolException* @throws IOException*/public boolean downloadFile(String url, String destFileName) {CloseableHttpClient httpclient = HttpClients.createDefault();HttpGet httpget = new HttpGet(url);HttpResponse response = null;InputStream in = null;try {response = httpclient.execute(httpget);HttpEntity entity = response.getEntity();in = entity.getContent();File file = new File(destFileName);FileOutputStream fout = new FileOutputStream(file);int l = -1;byte[] tmp = new byte[1024];while ((l = in.read(tmp)) != -1) {fout.write(tmp, 0, l);}fout.flush();fout.close();return true;} catch (IOException e) {e.printStackTrace();} finally {// 关闭低层流。if (in != null) {try {in.close();} catch (IOException e) {e.printStackTrace();}}try {httpclient.close();} catch (IOException e) {e.printStackTrace();}}return false;}/*** 进行URL编码** @param input* @return*/private String encode(String input) {if (input == null) {return "";}try {return URLEncoder.encode(input, "utf-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return input;}
}

Json 解析封装

根据 Gson 库进行封装，具体用法如下：

• json字符串转对象

  JsonUtil.fromJson(String json, Class<T> classOfT)

• 对象转json字符串

 JsonUtil.toJson(Object src);

JsonUtil 源码如下：

package com.util;import com.google.gson.Gson;public class JsonUtil {static Gson gson = new Gson() ;/*** json字符串转对象* @param json* @param classOfT* @param <T>* @return*/public static <T>T fromJson(String json, Class<T> classOfT){return gson.fromJson(json,classOfT);}/*** 对象转json字符串* @param src* @return*/public static String toJson(Object src){return gson.toJson(src);}}

Log 日志

Logger 类源码

package com.util;import com.intellij.notification.*;/*** logger* Created by zhaoyanjun on 15/11/27.*/
public class Logger {private static String NAME;private static int LEVEL = 0;public static final int DEBUG = 3;public static final int INFO = 2;public static final int WARN = 1;public static final int ERROR = 0;public static void init(String name,int level) {NAME = name;LEVEL = level;NotificationsConfiguration.getNotificationsConfiguration().register(NAME, NotificationDisplayType.NONE);}public static void debug(String text) {if (LEVEL >= DEBUG) {Notifications.Bus.notify(new Notification(NAME, NAME + " [DEBUG]", text, NotificationType.INFORMATION));}}public static void info(String text) {if (LEVEL > INFO) {Notifications.Bus.notify(new Notification(NAME, NAME + " [INFO]", text, NotificationType.INFORMATION));}}public static void warn(String text) {if (LEVEL > WARN) {Notifications.Bus.notify(new Notification(NAME, NAME + " [WARN]", text, NotificationType.WARNING));}}public static void error(String text) {if (LEVEL > ERROR) {Notifications.Bus.notify(new Notification(NAME, NAME + " [ERROR]", text, NotificationType.ERROR));}}
}

使用

//初始化
Logger.init("zhao" , Logger.DEBUG);//打印 debug 信息
Logger.debug("i am a debug");//打印info信息
Logger.info("i am a info");//打印warn信息
Logger.warn("i am a warn");//打印error信息
Logger.error("i am a error");

在 Android Studio 里效果如下

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