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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key
continue;
}
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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