Java 中HttpURLConnection附件上传的实例详解

Java 中HttpURLConnection附件上传的实例详解

java 中HttpURLConnection附件上传的实例详解

整合了一个自己写的采用Http做附件上传的工具，分享一下！

示例代码：

/**

* 以Http协议传输文件

*

* @author mingxue.zhang@163.com

*

*/

public class HttpPostUtil {

private final static char[] MULTIPART_CHARS = "-_1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

.toCharArray();

private URL url;

private HttpURLConnection conn;

private String boundary = null;

private Map textParams = new HashMap();

private Map fileparams = new HashMap();

public HttpPostUtil(String url) throws Exception {

this.url = new URL(url);

}

// 重新设置要请求的服务器地址，即上传文件的地址。

public void setUrl(String url) throws Exception {

this.url = new URL(url);

}

// 增加一个普通字符串数据到form表单数据中

public void addTextParameter(String name, String value) {

textParams.put(name, value);

}

// 增加一个文件到form表单数据中

public void addFileParameter(String name, File value) {

fileparams.put(name, value);

}

// 清空所有已添加的form表单数据

public void clearAllParameters() {

textParams.http://clear();

fileparams.clear();

}

/**

* 发送数据到服务器

*

* @return 一个字节包含服务器的返回结果的数组

* @throws Exception

*/

public byte[] send() throws Exception {

initConnection();

try {

conn.connect();

} catch (SocketTimeoutException e) {

throw new Exception(e);

}

OutputStream connOutStream = new DataOutputStream(

conn.getOutputStream());

writeFileParams(connOutStream);

writeStringParams(connOutStream);

writesEnd(connOutStream);

InputStream responseInStream = conn.getInputStream();

ByteArrayOutputStream responseOutStream = new ByteArrayOutputStream();

int len;

byte[] bufferByte = new byte[1024];

while ((len = responseInStream.read(bufferByte)) != -1) {

responseOutStream.write(bufferByte, 0, len);

}

responseInStream.close();

connOutStream.close();

conn.disconnect();

byte[] resultByte = responseOutStrehttp://am.toByteArray();

responseOutStream.close();

return resultByte;

}

// 文件上传的connection的一些必须设置

private void initConnection() throws Exception {

StringBuffer buf = new StringBuffer("----");

Random rand = new Random();

for (int i = 0; i < 15; i++) {

buf.append(MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)]);

}

this.boundary = buf.toString();

conn = (HttpURLConnection) this.url.openConnection();

conn.setDoOutput(true);

conn.setUseCaches(false);

conn.setConnectTimeout(3 * 60 * 1000); // 连接超时为10秒

conn.setRequestMethod("POST");

conn.setRequestProperty("Content-Type",

"multipart/form-data; boundary=" + boundary);

}

// 普通字符串数据

private void writeStringParams(OutputStream out) throws Exception {

Set keySet = textParams.keySet();

for (Iterator it = keySet.iterator(); it.hasNext();) {

String name = it.next();

String value = textParams.get(name);

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

out.write(("Content-Disposition: form-data; name=\"" + name + "\"\r\n")

.getBytes());

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

out.write((encode(value) + "\r\n").getBytes());

}

}

// 文件数据

private void writeFileParams(OutputStream out) throws Exception {

Set keySet = fileparams.keySet();

for (Iterator it = keySet.iterator(); it.hasNext();) {

String name = it.next();

File value = fileparams.get(name);

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

out.write(("Content-Disposition: form-data; name=\"" + name

+ "\"; filename=\"" + encode(value.getName()) + "\"\r\n")

.getBytes());

out.write(("ContentumqphjQQ-Type: " + getContentType(value) + "\r\n")

.getBytes());

out.write(("Content-Transfer-Encoding: " + "binary" + "\r\n")

.getBytes());

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

FileInputStream inStream = new FileInputStream(value);

int bytes = 0;

byte[] bufferByte = new byte[1024];

while ((bytes = inStream.read(bufferByte)) != -1) {

out.write(bufferByte, 0, bytes);

}

inStream.close();

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

}

}

// 添加结尾数据

private void writesEnd(OutputStream out) throws Exception {

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

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

}

// 获取文件的上传类型，图片格式为image/png,image/jpg等。非图片为application/octet-stream

private String getContentType(File f) throws Exception {

String fileName = f.getName();

if (fileName.endsWith(".jpg")) {

return "image/jpeg";

} else if (fileName.endsWith(".png")) {

return "image/png";

}

return "application/octet-stream";

}

// 对包含中文的字符串进行转码，此为UTF-8。服务器那边要进行一次解码

private String encode(String value) throws Exception {

return URLEncoder.encode(value, "UTF-8");

}

}

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