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A pure Java library that provides many tools, utils, and functions.
/**
* Copyright 2015 Sp42 [email protected]
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ajaxjs.net.http;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import com.ajaxjs.util.io.StreamUtil;
import com.ajaxjs.util.logger.LogHelper;
/**
* 远程请求器
*
* @author Sp42 [email protected]
*
*/
public class Client extends Connection {
private static final LogHelper LOGGER = LogHelper.getLog(Client.class);
/**
* 创建一个远程请求器
*
* @param url 请求目标地址
*/
public Client(String url) {
super(url);
}
/**
* 简单 GET 请求（原始 API 版），返回文本。
*
* @param url 请求目标地址
* @return 响应内容（如 HTML，JSON 等）
*/
public static String simpleGET(String url) {
StreamUtil client = new StreamUtil();
try {
client.setIn(new URL(url).openStream());
client.byteStream2stringStream().close();
return client.getContent();
} catch (IOException e) {// 简单调用，不作异常处理
return null;
}
}
/**
* 简单 GET 请求，返回文本。
*
* @param url 请求目标地址
* @return 响应内容（如 HTML，JSON 等）
*/
public static String GET(String url) {
try {
return new Client(url).connect().getContent();
} catch (ConnectException e) {
LOGGER.warning(e);
return null;
}
}
/**
* 简单 GET 请求（带 GZip 处理），返回文本。
*
* @param url 请求目标地址
* @return 响应内容（如 HTML，JSON 等）
*/
public static String GET_Gzip(String url) {
try {
return new Client(url).setEnableGzip(true).connect().getContent();
} catch (ConnectException e) {
LOGGER.warning(e);
return null;
}
}
/**
* HEAD 请求之前的准备
*
* @param url 请求目标地址
* @return 本类实例
*/
private static Client initHead(String url) {
Client client = new Client(url);
// 不需要转化响应文本，节省资源
client.setMethod("HEAD").setTextResponse(false).customConnection(new CustomConnection() {
@Override
public void callback(HttpURLConnection connection) {
connection.setInstanceFollowRedirects(false); // 必须设置 false，否则会自动 redirect 到 Location 的地址
}
});
return client;
}
/**
* 检测资源是否存在
*
* @param url 目标地址
* @return true 表示 404 不存在
*/
public static boolean is404(String url) {
try {
return initHead(url).connect().getConnection().getResponseCode() == 404;
} catch (ConnectException e) {
LOGGER.warning(e);
if (e.getMessage().indexOf("404") != -1) // 已知异常为 404
return true;
return false;
} catch (IOException e) {
LOGGER.warning(e);
return false;
}
}
/**
* 得到 HTTP 302 的跳转地址
*
* @param url 目标地址
* @return 跳转地址
*/
public static String get302redirect(String url) {
try {
return initHead(url).connect().getConnection().getHeaderField("Location");
} catch (ConnectException e) {
LOGGER.warning(e);
return null;
}
}
/**
* 得到资源的文件大小
*
* @param url 目标地址
* @return 文件大小
*/
public static long getFileSize(String url) {
String contentLength = null;
try {
contentLength = initHead(url).connect().getConnection().getHeaderField("content-length");
} catch (ConnectException e) {
LOGGER.warning(e);
return 0;
}
return Long.parseLong(contentLength);
}
/**
* 获取远程资源的大小 （另外一种写法，可作为参考之）
*
* @param url 目标地址
* @return 文件大小
*/
public static long getRemoteSize(String url) {
long size = 0;
try {
HttpURLConnection conn = (HttpURLConnection) (new URL(url)).openConnection();
size = conn.getContentLength();
conn.disconnect();
} catch (IOException e) {
LOGGER.warning(e);
}
return size;
}
/**
* POST 请求
*
* @param url 请求目标地址
* @param data 表单数据 KeyValue的请求数据，注意要进行 ? & 编码，使用 URLEncoder.encode()
* @return 携带请求信息的 Bean
*/
public static String POST(String url, Map data) {
if (data != null && data.size() > 0) {
return POST(url, join(data).getBytes());
} else {
return null;
}
}
/**
* POST 请求
*
* @param url 请求目标地址
* @param params 字符串类型的请求数据
* @return 请求之后的响应的内容
*/
public static String POST(String url, String params) {
return POST(url, params.getBytes());
}
/**
* POST 请求
*
* @param url 请求目标地址
* @param b 字节格式的请求数据
* @return 请求之后的响应的内容
*/
public static String POST(String url, byte[] b) {
Client client = new Client(url);
client.setMethod("POST").setData(b);
client.getConnection().setDoOutput(true); // for conn.getOutputStream().write(someBytes);
client.getConnection().setDoInput(true);
client.getConnection().setRequestProperty("Content-type", "application/x-www-form-urlencoded;charset=utf-8");
try {
client.connect();
} catch (ConnectException e) {
LOGGER.warning(e);
return null;
}
client.setDone(true);
return client.getContent();
}
/**
* Map 转换为 String
*
* @param map Map
* @return String
*/
public static String join(Map map) {
String[] pairs = new String[map.size()];
int i = 0;
try {
for (String key : map.keySet())
pairs[i++] = key + "=" + URLEncoder.encode(map.get(key).toString(), StandardCharsets.UTF_8.toString());
} catch (UnsupportedEncodingException e) {
LOGGER.warning(e);
}
return String.join("&", pairs);
}
/**
* request 头和上传文件内容之间的分隔符
*/
private static final String BOUNDARY = "---------------------------123821742118716";
/**
* 多段 POST 的分隔
*/
private static final String DIV = "\r\n--%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n%s";
/**
* 模拟多段上传 TODO
*
* @param url 请求目标地址
* @param text 文本数据
* @param fileMap 二进制（文件）数据
* @return 携带请求信息的 Bean
*/
public static String multiPOST(String url, Map text, Map fileMap) {
byte[] data = null;
if (text != null && text.size() > 0) {
StringBuilder strs = new StringBuilder();
for (String name : text.keySet()) {
String value = text.get(name).toString();
strs.append(String.format(DIV, BOUNDARY, name, value));
// strs.append("\r\n").append("--").append(BOUNDARY).append("\r\n");
// strs.append("Content-Disposition: form-data; name=\"" + name
// + "\"\r\n\r\n");
// strs.append(value);
}
data = strs.toString().getBytes();
}
if (fileMap != null && fileMap.size() > 0) {
for (String name : fileMap.keySet()) {
String value = fileMap.get(name);
File file = new File(value);
String filename = file.getName();
// String contentType = FileUtil.getMime(file);
// String str = String.format(DIV, BOUNDARY, name, filename) + "Content-Type:" +
// contentType + "\r\n\r\n";
StringBuffer strBuf = new StringBuffer();
strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");
strBuf.append(
"Content-Disposition: form-data; name=\"" + "ddd" + "\"; filename=\"" + filename + "\"\r\n");
// strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
// out.write(strBuf.toString().getBytes());
StreamUtil.concat(data, strBuf.toString().getBytes());
StreamUtil.concat(data, StreamUtil.fileAsByte(file));
}
}
StreamUtil.concat(data, ("\r\n--" + BOUNDARY + "--\r\n").getBytes());
Client client = new Client(url);
client.setData(data);
client.getConnection().setDoOutput(true); // for conn.getOutputStream().write(someBytes);
client.getConnection().setDoInput(true);
client.getConnection().setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
try {
client.connect();
} catch (ConnectException e) {
LOGGER.warning(e);
return null;
}
client.setDone(true);
return client.getContent();
}
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