HttpURLConnection Post请求上传文件和参数到servlet

来源：互联网发布：太平洋交易软件下载编辑：程序博客网时间：2024/06/08 04:58

前台代码：

public String uplaod(String actionUrl, Map<String, String> params) {
InputStream in = null;
String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFFIX = "--", LINEND = "\r\n";
String MULTIPART_FROM_DATA = "multipart/form-data";
String CHARSET = "UTF-8";
URL uri;
StringBuilder sb2 = null;
String filePath = params.get("FILE_PATH");
try {
uri = new URL(actionUrl);
HttpURLConnection conn = (HttpURLConnection) uri.openConnection();// 设置从主机读取数据超时
conn.setReadTimeout(10 * 1000);
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charset", "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);

// 首先组拼文本类型的参数
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> entry : params.entrySet()) {
sb.append(PREFFIX);
sb.append(BOUNDARY);
sb.append(LINEND);
sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);
sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
sb.append(LINEND);
sb.append(entry.getValue());
sb.append(LINEND);

}

DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());
outStream.write(sb.toString().getBytes(CHARSET));

// 构建发送字符串数据
if (!ApplicationUtil.isEmptyString(filePath)) {
String fileName = params.get("FILE_NAME");
StringBuilder sb1 = new StringBuilder();
sb1.append(PREFFIX);
sb1.append(BOUNDARY);
sb1.append(LINEND);
sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + fileName + "\"" + LINEND);
sb1.append("Content-Type: application/octet-stream;chartset=" + CHARSET + LINEND);
sb1.append(LINEND);
// 写入到输出流中
outStream.write(sb1.toString().getBytes());

// 将文件读入输入流中
InputStream is = new FileInputStream(filePath);
byte[] buffer = new byte[1024];
int len = 0;
// 写入输出流
while ((len = is.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
is.close(); // 添加换行标志
outStream.write(LINEND.getBytes());
} // 请求结束标志
byte[] end_data = (PREFFIX + BOUNDARY + PREFFIX + LINEND).getBytes();
outStream.write(end_data); // 刷新发送数据
outStream.flush(); // 得到响应码
int res = conn.getResponseCode();

// 上传成功返回200
if (res == 200) {
in = conn.getInputStream();
int ch;
sb2 = new StringBuilder(); // 保存数据
while ((ch = in.read()) != -1) {
sb2.append((char) ch);
}
}
conn.disconnect();
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (ProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return sb2 == null ? null : sb2.toString();

}

后台servlet：

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
Map<String,String> params=new HashMap<String,String>();

boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart) {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
byte[] fileData = null;
Connection conn = null;
try {
Iterator items = upload.parseRequest(request).iterator();
conn = JdbcUtil.getConnection();
while (items.hasNext()) {
FileItem item = (FileItem) items.next();
if (!item.isFormField()) {
InputStream in = item.getInputStream();
//fileData = IOUtils.toByteArray(in);

//InputStream
ByteArrayOutputStream output = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
int n = 0;
while (-1 != (n = in.read(buffer))) {
output.write(buffer, 0, n);
}
fileData=output.toByteArray();

}
else {
params.put(item.getFieldName(), item.getString());
}
}

}
catch (Exception e2) {
log.info("error" + e2.getMessage());
}
}

}

1 0