java代碼實現訪問網絡外部接口并獲取數據的工具類

工具類代碼，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發送GET方法的請求

* 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。

* @param url

* 發送請求的URL

* @return URL 所代表遠程資源的響應結果

*/

public static String sendGet(String url) {

StringBuilder result = new StringBuilder();

BufferedReader in = null;

try {

URL realUrl = new URL(url);

// 打開和URL之間的連接

URLConnection connection = realUrl.openConnection();

// 設置通用的請求屬性

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");

// 建立實際的連接

connection.connect();

// 遍歷所有的響應頭字段

// for (String key : map.keySet()) {

// System.out.println(key + "--->" + map.get(key));

// }

// 定義 BufferedReader輸入流來讀取URL的響應

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("發送GET請求出現異常！" + e);

result = new StringBuilder("{\"resCode\":\"1\",\"errCode\":\"1001\",\"resData\":\"\"}");

e.printStackTrace();

log.error("遠程服務未開啟", e);

}

// 使用finally塊來關閉輸入流

finally {

try {

if (in != null) {

in.close();

}

} catch (Exception e2) {

e2.printStackTrace();

}

}

return result.toString();

}

/**

* 向指定 URL 發送POST方法的請求

*

* @param url

* 發送請求的 URL

* @param param

* 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。

* @return 所代表遠程資源的響應結果

*/

public static String sendPost(String url, String param) {

PrintWriter out = null;

BufferedReader in = null;

StringBuilder result = new StringBuilder();

try {

URL realUrl = new URL(url);

// 打開和URL之間的連接

URLConnection conn = realUrl.openConnection();

// 設置通用的請求屬性

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");

// 發送POST請求必須設置如下兩行

conn.setDoOutput(true);

conn.setDoInput(true);

// 獲取URLConnection對象對應的輸出流

out = new PrintWriter(conn.getOutputStream());

// 發送請求參數

out.print(param);

// flush輸出流的緩沖

out.flush();

// 定義BufferedReader輸入流來讀取URL的響應

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result.append(line);

}

} catch (Exception e) {

//System.out.println("發送 POST 請求出現異常！" + e);

result = new StringBuilder("{\"resCode\":\"1\",\"errCode\":\"1001\",\"resData\":\"\"}");

e.printStackTrace();

log.error("遠程服務未開啟", e);

}

// 使用finally塊來關閉輸出流、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 發送POST方法的請求

*

* @param url

* 發送請求的 URL

* @param param

* 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。

* @return 所代表遠程資源的響應結果

*/

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);

// 打開和URL之間的連接

URLConnection conn = realUrl.openConnection();

// 設置通用的請求屬性

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");

// 發送POST請求必須設置如下兩行

conn.setDoOutput(true);

conn.setDoInput(true);

// 發送參數

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輸入流來讀取URL的響應

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result.append(line);

}

} catch (Exception e) {

//System.out.println("發送 POST 請求出現異常！" + e);

result = new StringBuilder("{\"resCode\":\"1\",\"errCode\":\"1001\",\"resData\":\"\"}");

e.printStackTrace();

}

// 使用finally塊來關閉輸出流、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();

}

}

總結

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