Java 发送http请求上传文件功能实例

Java 发送http请求上传文件功能实例

废话不多说了，直接给大家贴代码了，具体代码如下所示：

package wxapi.WxHelper;

import java.io.BufferedReader;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLConnection;

import java.util.Date;

import java.util.Map;

import java.util.Map.Entry;

public class HttpRequestUtil {

/**

* 发送get请求

*

* @param requestUrl

* 请求url

* @param requestHeader

* 请求头

* @param responseEncoding

* 响应编码

* @return 页面响应html

*/

public static String sendGet(String requestUrl, Map requestHeader, String responseEncoding) {

String result = "";

BufferedReader reader = null;

try {

if (requestUrl == null || requestUrl.isEmpty()) {

return result;

}

URL realUrl = new URL(requestUrl);

URLConnection connection = realUrl.openConnection();

connection.setRequestProperty("accept", "text/html, application/xhtml+xml, image/jxr, */*");

connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0");

if (requestHeader != null && requestHeader.size() > 0) {

for (Entry entry : requestHeader.entrySet()) {

connection.setRequestProperty(entry.getKey(), entry.getValue());

}

}

connection.connect();

if (responseEncoding == null || responseEncoding.isEmpty()) {

responseEncoding = "UTF-8";

}

reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), responseEncoding));

String line;

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

result += line;

}

} catch (Exception e) {

System.out.println("发送GET请求出现异常http://！");

e.printStackTrace();

} finally {

try {

if (reader != null) {

reader.close();

}

} catch (Exception e) {

e.printStackTrace();

}

}

return result;

}

/**

* 发送post请求

*

* @param requestUrl

* 请求url

* @param requestHeader

* 请求头

* @param formTexts

* 表单数据

* @param files

* 上传文件

* @param requestEncoding

* 请求编码

* @param responseEncoding

* 响应编码

* @return 页面响应html

*/

public static String sendPost(String requestUrl, Map requestHeader, Map formTexts, Map files, String requestEncoding, String responseEncoding) {

OutputStream out = null;

BufferedReader reader = null;

String result = "";

try {

if (requestUrl == null || requestUrl.isEmpty()) {

return result;

}

URL realUrl = new URL(requestUrl);

HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();

connection.setRequestProperty("accept", "text/html, application/xhtml+xml, image/jxr, */*");

connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0");

if (requestHeader != null && requestHeader.size() > 0) {

for (Entry entry : requestHeader.entrySet()) {

connection.setRequestProperty(entry.getKey(), entry.getValue());

}

}

connection.setDoOutput(true);

connection.setDoInput(true);

connection.setRequestMethod("POST");

if (requestEncoding == null || requestEncoding.isEmpty()) {

rhttp://equestEncoding = "UTF-8";

}

if (responseEncoding == null || responseEncoding.isEmpty()) {

responseEncoding = "UTF-8";

}

if (requestHeader != null && requestHeader.size() > 0) {

for (Entry entry : requestHeader.entrySet()) {

connection.setRequestProperty(entry.getKey(), entry.getValue());

}

}

if (files == null || files.size() == 0) {

connection.setRequestProperty("content-type", "application/x-www-form-urlencoded");

out = new DataOutputStream(connection.getOutputStream());

if (formTexts != null && formTexts.size() > 0) {

String formData = "";

for (Entry entry : formTexts.entrySet()) {

formData += entry.getKey() + "=" + entry.getValue() + "&";

}

formData = formData.substring(0, formData.length() - 1);

out.write(formData.toString().getBytes(requestEncoding));

}

} else {

String boundary = "-----------------------------" + String.valueOf(new Date().getTime());

connection.setRequestProperty("content-type", "multipart/form-data; boundary=" + boundary);

out = new DataOutputStream(connection.getOutputStream());

if (formTexts != null && formTexts.size() > 0) {

StringBuilder sbFormData = new StringBuilder();

for (Entry entry : formTexts.entrySet()) {

sbFormData.append("--" + boundary + "\r\n");

sbFormData.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"\r\n\r\n");

sbFormData.append(entry.getValue() + "\r\n");

}

out.write(sbFormData.toString().getBytes(requestEncoding));

}

for (Entry entry : files.entrySet()) {

String fileName = entry.getKey();

String filePath = entry.getValue();

if (fileName == null || fileName.isEmpty() || filePath == null || filePath.isEmpty()) {

continue;

}

File file = new File(filePath);

if (!file.exists()) {

continue;

}

out.write(("--" + boundary + "\r\n").getBytes(requestEncoding));

out.write(("Content-Disposition: form-data; name=\"" + fileName + "\"; filename=\"" + file.getName() + "\"\r\n").getBytes(requestEncoding));

out.write(("Content-Type: application/x-msdownload\r\n\r\n").getBytes(requestEncoding));

DataInputStream in = new DataInputStream(new FileInputStream(file));

int bytes = 0;

byte[] bufferOut = new byte[1024];

while ((bytes = in.read(bufferOut)) != -1) {

out.write(bufferOut, 0, bytes);

}

in.close();

out.write(("\r\n").getBytes(requestEncoding));

}

out.write(("--" + boundary + "--").getBytes(requestEncoding));

}

out.flush();

out.close();

out = null;

reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), responseEncoding));

String line;

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

result += line;

}

} catch (Exception e) {

System.out.println("发送POST请求出现异常！");

e.printStackTrace();

} finally {

try {

if (out != null) {

out.close();

}

if (reader != null) {

reader.close();

}

} catch (IOException ex) {

ex.printStackTrace();

}

}

return result;

}

}

以上所述是给大家介绍的Java 发送http请求上传文件功能实例，希望对大家有所帮助，如果大家有任何疑问请给我留言，会及时回复大家的。在此也非常感谢大家对我们网站的支持！

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