java外部接口图解_java代码实现访问网络外部接口并获取数据的工具类详解
java代碼實(shí)現(xiàn)訪問(wèn)網(wǎng)絡(luò)外部接口并獲取數(shù)據(jù)的工具類(lèi)
工具類(lèi)代碼，可以直接copy使用
package com.yqzj.util;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
public class HttpRequestUtil {
/** 日志 */
private static Logger log = LogManager.getLogger(HttpRequestUtil.class);
/**
* 向指定URL發(fā)送GET方法的請(qǐng)求
* 請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
* @param url
* 發(fā)送請(qǐng)求的URL
* @return URL 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
*/
public static String sendGet(String url) {
StringBuilder result = new StringBuilder();
BufferedReader in = null;
try {
URL realUrl = new URL(url);
// 打開(kāi)和URL之間的連接
URLConnection connection = realUrl.openConnection();
// 設(shè)置通用的請(qǐng)求屬性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
connection.setRequestProperty("Accept-Charset", "UTF-8");
connection.setRequestProperty("contentType", "UTF-8");
// 建立實(shí)際的連接
connection.connect();
// 遍歷所有的響應(yīng)頭字段
// for (String key : map.keySet()) {
// System.out.println(key + "--->" + map.get(key));
// }
// 定義 BufferedReader輸入流來(lái)讀取URL的響應(yīng)
in = new BufferedReader(new InputStreamReader(
connection.getInputStream(), "utf-8"));
String line;
while ((line = in.readLine()) != null) {
result.append(line);
}
} catch (Exception e) {
//System.out.println("發(fā)送GET請(qǐng)求出現(xiàn)異常！" + e);
result = new StringBuilder("{\"resCode\":\"1\",\"errCode\":\"1001\",\"resData\":\"\"}");
e.printStackTrace();
log.error("遠(yuǎn)程服務(wù)未開(kāi)啟", e);
}
// 使用finally塊來(lái)關(guān)閉輸入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result.toString();
}
/**
* 向指定 URL 發(fā)送POST方法的請(qǐng)求
*
* @param url
* 發(fā)送請(qǐng)求的 URL
* @param param
* 請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
* @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
*/
public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
StringBuilder result = new StringBuilder();
try {
URL realUrl = new URL(url);
// 打開(kāi)和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設(shè)置通用的請(qǐng)求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setRequestProperty("contentType", "UTF-8");
// 發(fā)送POST請(qǐng)求必須設(shè)置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
// 獲取URLConnection對(duì)象對(duì)應(yīng)的輸出流
out = new PrintWriter(conn.getOutputStream());
// 發(fā)送請(qǐng)求參數(shù)
out.print(param);
// flush輸出流的緩沖
out.flush();
// 定義BufferedReader輸入流來(lái)讀取URL的響應(yīng)
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result.append(line);
}
} catch (Exception e) {
//System.out.println("發(fā)送 POST 請(qǐng)求出現(xiàn)異常！" + e);
result = new StringBuilder("{\"resCode\":\"1\",\"errCode\":\"1001\",\"resData\":\"\"}");
e.printStackTrace();
log.error("遠(yuǎn)程服務(wù)未開(kāi)啟", e);
}
// 使用finally塊來(lái)關(guān)閉輸出流、輸入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result.toString();
}
/**
* 向指定 URL 發(fā)送POST方法的請(qǐng)求
*
* @param url
* 發(fā)送請(qǐng)求的 URL
* @param param
* 請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
* @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
*/
public static String sendFile(String url, String param,
BufferedInputStream bInputStream) {
BufferedOutputStream out = null;
BufferedReader in = null;
StringBuilder result = new StringBuilder();
try {
URL realUrl = new URL(url);
// 打開(kāi)和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設(shè)置通用的請(qǐng)求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
conn.setRequestProperty("Accept-Charset", "UTF-8");
conn.setRequestProperty("contentType", "multipart/form-data");
// 發(fā)送POST請(qǐng)求必須設(shè)置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
// 發(fā)送參數(shù)
StringBuffer sb = new StringBuffer();
sb = sb.append(param);
byte[] paramData = sb.toString().getBytes();
//System.out.println(paramData.length);
out = new BufferedOutputStream(conn.getOutputStream());
out.write(paramData);
if (bInputStream != null) {
byte[] data = new byte[2048];
while (bInputStream.read(data) != -1) {
out.write(data);
}
}
out.flush();
// flush輸出流的緩沖
// 定義BufferedReader輸入流來(lái)讀取URL的響應(yīng)
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result.append(line);
}
} catch (Exception e) {
//System.out.println("發(fā)送 POST 請(qǐng)求出現(xiàn)異常！" + e);
result = new StringBuilder("{\"resCode\":\"1\",\"errCode\":\"1001\",\"resData\":\"\"}");
e.printStackTrace();
}
// 使用finally塊來(lái)關(guān)閉輸出流、輸入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
if (bInputStream != null) {
bInputStream.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result.toString();
}
}
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