花了一段時間做這個,把上傳檔案 或 上傳參數 用的超簡單,這是參考 Unity 的 WWW 類別 下去做的
如果有摸過 Unity 的人應該很快就會了,沒摸過的人也不用擔心
因為這個很簡單啦 ~ 把它當類別庫使用即可
廢話不多說,快來看一下程式碼吧 !

import java.io.IOException;

/**
*
* @author Loli
*/
public class NewClass1 {

    public static void main(String[] args) throws IOException {
        WWW w = new WWW("http://192.168.1.114:8080/MyUploadFile");
        w.addValue("name", "aaa"); // 加入參數 Key, Value
        w.addValue("lover_name", "bbb"); // 可以加很多參數
        w.addValue("中文鍵", "中文值"); // Key, Value 也可以是中文
        w.addFile("my_file", "C:/Users/Loli/Desktop/A.jpg"); // 加入檔案 Key, 檔案路徑
        w.addFile("my_file", "C:/Users/Loli/Desktop/B.jpg"); // 可以加很多檔案
        w.addFile("my_file", "C:/Users/Loli/Desktop/C.jpg");
        w.upload(); // 上傳
        w.close();
        System.out.println(w.getText()); // 取得伺服器回傳訊息
    }
}

如何? 簡單吧 ? 但是下面程式碼太多,懶得排版...就直接複製貼上拿去用就好啦 ! 哈

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;

/**
*
* @author Loli
*/
public class WWW {

private String charset = "UTF-8";
private String CRLF = "\r\n"; // Line separator required by multipart/form-data.

private String url;
private ArrayList<String[]> fileList = new ArrayList<>();
private ArrayList<String[]> valueList = new ArrayList<>();

private String text = "";
private boolean haveFile = false;

private OutputStream output;
private OutputStreamWriter outputW;
private PrintWriter writer;
private HttpURLConnection httpConn;
private InputStreamReader in;
private BufferedReader br;

public WWW(String url) {
this.url = url;
}

public WWW(String url, String charset) { // URL , 編碼方式 (預設為 UTF-8)
this.url = url;
this.charset = charset;
}

public WWW(String url, String charset, String CRLF) { //URL , 編碼方式 (預設為 UTF-8) , 自訂換行字元
this.url = url;
this.charset = charset;
this.CRLF = CRLF;
}

public void addFile(String key, String path) {
// [0] = key
// [1] = path
fileList.add(new String[]{key, path});
haveFile = true;
}

public void addValue(String key, String value) {
// [0] = key
// [1] = value
valueList.add(new String[]{key, value});
}

public String getText() {
return text;
}

public void upload() throws MalformedURLException, IOException {

// --- HTTP ---
URLConnection conn = new URL(url).openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);

String boundary = null; // Just generate some unique random value.

if (haveFile) {
boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
} else {
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
}

try (
OutputStream output = conn.getOutputStream();
OutputStreamWriter outputW = new OutputStreamWriter(output, charset);
PrintWriter writer = new PrintWriter(outputW, true);) {

this.output = output;
this.outputW = outputW;
this.writer = writer;

if (haveFile) {
// 上傳每個參數 -------------------------------------------------
// kv [0] = key
// kv [1] = path
for (String[] kv : valueList) {
writer.append("--" + boundary).append(CRLF);
writer.append("Content-Disposition: form-data; name=\"" + kv[0] + "\"").append(CRLF);
writer.append("Content-Type: text/plain; charset=" + charset).append(CRLF);
writer.append(CRLF).append(kv[1]).append(CRLF).flush();
}
// 上傳 每個檔案 ------------------------------------------------
// fileInfo [0] = key
// fileInfo [1] = path
for (String[] fileInfo : fileList) {
File binaryFile = new File(fileInfo[1]);
writer.append("--" + boundary).append(CRLF);
writer.append("Content-Disposition: form-data; name=\"" + fileInfo[0] + "\"; filename=\"" + binaryFile.getName() + "\"").append(CRLF);
writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(binaryFile.getName())).append(CRLF);
writer.append("Content-Transfer-Encoding: binary").append(CRLF);
writer.append(CRLF).flush();

// Upload File
try (InputStream is = new FileInputStream(binaryFile)) {
byte[] buf = new byte[8192];
int c = 0;
while ((c = is.read(buf, 0, buf.length)) > 0) {
output.write(buf, 0, c);
output.flush();
}
is.close();
buf = null;
}
writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.
}
// End of multipart/form-data.
writer.append("--" + boundary + "--").append(CRLF).flush();

} else { // Haven't File , 如果沒有夾帶檔案
// 上傳每個參數 -------------------------------------------------
for (int i = 0; i < valueList.size(); i++) {
String[] kv = valueList.get(i);
String data
= URLEncoder.encode(kv[0], charset)
+ "="
+ URLEncoder.encode(kv[1], charset);
if (i < valueList.size() - 1) {
data += "&";
}
writer.append(data);
}
writer.append(CRLF).flush();
}

// 回傳訊息 ---------------------------------------------------------
HttpURLConnection httpConn = (HttpURLConnection) conn; // 回傳使用
this.httpConn = httpConn;
try (InputStreamReader in = new InputStreamReader(httpConn.getInputStream());
BufferedReader br = new BufferedReader(in);) {
this.in = in;
this.br = br;
text = "";
String line = "";
while ((line = br.readLine()) != null) {
text += line;
}
close();
}
}
}

public void close() {
try {
if (output != null) {
output.close();
}
} catch (IOException e) {
}
try {
if (outputW != null) {
outputW.close();
}
} catch (IOException e) {
}
try {
if (writer != null) {
writer.close();
}
} catch (Exception e) {
}
try {
if (httpConn != null) {
httpConn.disconnect();
}
} catch (Exception e) {
}
try {
if (in != null) {
in.close();
}
} catch (IOException e) {
}
try {
if (br != null) {
br.close();
}
} catch (IOException e) {
}
}

}

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